Podcasts about Exome

  3ème épisode / 5, de la série sur la rétinite pigmentaire. Episode 3 : Maladie rare - Diagnostiquer une Rétinite Pigmentaire. Invitée : Dr Guylène Le Meur, ophtalmologiste, chef du service d'ophtalmologie du CHU de Nantes et coordonnatrice du centre de référence REFERET des (maladies rares neuro-rétiniennes) affilié à la filière SENSGENE. https://www.sraesensoriel.fr/ressource/chu-nantes  https://www.sensgene.com/    1️⃣   Quel tableau clinique doit faire suspecter une rétinite pigmentaire ? [0'33– 1'02] ✔️ Difficultés à l'obscurité, ✔️ Vision périphérique altérée, ✔️ Photophobie, ✔️ Altération de la vision des couleurs. Pour plus d'informations, retrouvez notre page article : https://rarealecoute.com/la-retinite-pigmentaire/ 2️⃣   Comment effectuer le diagnostic de cette maladie rare ? [1'03 – 1'41] ✔️ Évaluation multimodale : fond d'œil, OCT, auto-fluorescence, électrorétinogramme. 3️⃣   Quels sont les spécialistes impliqués ?  [1'42 -2'11] ✔️ ORL en cas de surdité associée, endocrinologue en cas de diabète... ✔️ Généticiens si une prise en charge plus globale est requise. 4️⃣   Quels diagnostics différentiels écarter ? [2'12–2'37] ✔️ Altérations rétiniennes iatrogènes, causes immunitaires, uvéites... 5️⃣   L'examen génétique est-il réalisé de manière systématique ? [2'38 – 3'03] ✔️ Systématique chez les jeunes patients 6️⃣   À qui adresser les patients atteints d'une rétinite pigmentaire ? [3'04 – 4'01] ✔️Réseau SENSGENE : centres de compétence ou de référence ✔️Importance des centres basse vision, et des associations de patients ✔️Suivi coordonné avec les ophtalmologistes de ville   L'équipe : Virginie Druenne – Ambassadrice RARE à l'écoute Cyril Cassard – Journaliste/Animation Hervé Guillot - Production Crédits : Sonacom ************************************************************************************************************************** À propos : "RARE à l'écoute" est un podcast dédié à la sensibilisation aux maladies rares et au soutien des personnes touchées par ces affections. Créé par un groupe passionné de professionnels de la santé, le podcast vise à informer les professionnels de santé et fournissant des informations sur les dernières avancées médicales et scientifiques dans le domaine des maladies rares, et inspirer les patients et leurs proches en partageant des histoires de courage et de persévérance. Contenu :

“We are driving the market to exome and genome testing with a goal of making multigene panels be a thing of the past” Katherine Stueland, CEO of GeneDx, tells Bloomberg Intelligence's analyst Jonathan Palmer on this episode of the Vanguards of Health Care podcast. They discuss GeneDx's 80% market share in exome sequencing, the evolution of the genetic testing market and why the company's core mission is delivering clinically-actionable results in rare diseases.  See omnystudio.com/listener for privacy information.

A superlative trio, Dr Machteld Oud, Dr Clara van Karnebeek and Dr Saskia Wortmann join the podcast to explain the importance of diagnostics, why all exomes aren't equal and just how should you proceed after a 'negative' exome. How to proceed after “negative” exome: A review on genetic diagnostics, limitations, challenges, and emerging new multiomics techniques Saskia B. Wortmann, et al https://doi.org/10.1002/jimd.12507

CITR's 24 Hours of Radio Art in a snack sized format. Dark Ambient. Drone. Field Recordings. Noise. Sound Art. Or something. This evening's broadcast features new VYORMMOUTH, NOEL MEEK / MATTIN, WALLMART, and EXOME.

Hello everyone and welcome back! Let's chat about our genes and obesity. What is the source of obesity and is it out of our hands? Let's find out in today's episode. The research article (summary): https://www.sciencedaily.com/releases/2023/08/230802132025.htmGet in touch with me: Email: gardnermairi12345@gmail.comInstagram: mairihgardnerTiktok: mairigardner57 Blog: aaahealths.com Website: www.mairigardner.com Do you have any questions about what I offer and how I can help you? Book your FREE 15-minute session today @ www.mairigardner.com I would love to chat! Remember to share, like, comment and follow! 

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2023.07.01.547348v1?rss=1 Authors: Fazeli, E., Child, D. D., Bucks, S. A., Stovarsky, M., Edwards, G., Yu, C.-E., Latimer, C., Kitago, Y., Bird, T., Jayadev, S., Young, J. E. Abstract: The SORL1 gene has recently emerged as a strong Alzheimer Disease risk gene. Over 500 different variants have been identified in the gene and the contribution of individual variants to AD development and progression is still unknown. Here, we describe a multi-generational family with both early- and late-onset AD in two generations. Exome sequencing identified a coding variant, p.(Arg953Cys), in SORL1 in 4 of 5 individuals affected by AD. Notably, variant carriers had severe AD pathology, including the presence of Ab plaques in the cerebellum as well as TDP-43 pathology. We further characterized this variant and show that this Arginine substitution occurs at a critical domain position of the SORL1 translation product, SORL1. In vitro studies further show that the SORL1 p.R953C variant has decreased maturation and shedding of the SORL1 protein, and also leads to mis-localization within cells. Together, our analysis suggests that p.R953C is a likely pathogenic variant of SORL1 and sheds light on mechanisms of how missense SORL1 variants may lead to AD. Copy rights belong to original authors. Visit the link for more info Podcast created by Paper Player, LLC

Today, on the Newborn Screening SPOTlight podcast, we are thrilled to have Dr. Cynthia Powell join us to share her vision of genomic sequencing in newborn and her experience as the Past Chair of the U.S. federal Advisory Committee on Heritable Disorders in Newborns and Children. Dr. Powell is a Professor of Pediatrics and Genetics at the University of North Carolina at Chapel Hill School of Medicine, where she sees patients, teaches students, residents and fellows, and participates in research.  She is a board-certified clinical geneticist, cytogeneticist, pediatrician and genetic counselor.  She completed her pediatric residency at Children's National Medical Center in Washington, D.C. and medical genetics fellowship at Children's National Medical Center and the National Institutes of Health.    She is the program director of the UNC Hospitals Medical Genetics and Genomics Residency Program.  She is the immediate past Chair of the U.S. federal Advisory Committee on Heritable Disorders in Newborns and Children and a member of the Board of Directors of the American College of Medical Genetics and Genomics.    She is Past President of the Association of Professors of Human and Medical Genetics and the American Board of Medical Genetics and Genomics.  She serves on the North Carolina Newborn Screening Advisory Committee and the North Carolina Genetics and Genomics Advisory Committee.  Her research interests include newborn screening, genomics, birth defects and genetic syndromes. She led the North Carolina Newborn Exome Sequencing for Universal Screening (NC NEXUS) project, a five year project funded by NIH investigating the utility of next generation sequencing in newborns.    She is the UNC site principal investigator for the Early Check project, a voluntary newborn screening research project in North Carolina that offers parents the opportunity to have their infant screened for conditions that are not yet part of standard public health newborn screening.   She currently serves on the NBSTRN Steering Committee and has contributed to the development of tools and resources for newborn screening research. Dr. Powell wears many hats in her different roles in medical genetics and newborn screening. You will be inspired by her story of dedicated commitment in improving the lives of children. 

Please join authors Loren Field and Sean Reuter, as well as Associate Editor Thomas Eschenhagen as they discuss the article "Cardiac Troponin I-Interacting Kinase Affects Cardiomyocyte S-Phase Activity But Not Cardiomyocyte Proliferation." Dr. Greg Hundley: Welcome listeners, to this January 10th issue of Circulation on the Run, and I am Dr. Greg Hundley, associate editor, director of the Pauley Heart Center at VCU Health in Richmond, Virginia. Dr. Peder Myhre: I am Dr. Peder Myhre from Akershus University Hospital and University of Oslo in Norway. Dr. Greg Hundley: Well, listeners, this week's feature discussion delves into the world of preclinical science and evaluates cardiac troponin I and its impact on S phase activity in cardiomyocytes, and does that relate to cardiomyocyte proliferation. But before we get to that, how about we grab a cup of coffee and Peder and I will work through some of the other articles in the issue. Peder, how about this week I go first? Dr. Peder Myhre: Go ahead, Greg. Dr. Greg Hundley: Right. So Peder, this first study evaluated whether the burden of positive coronary artery calcification on cardiovascular disease differed by multidimensional individual characteristics, and so the investigators led by Dr. Kosuke Inoue from Kyoto University sought to investigate the heterogeneity in the association between positive coronary artery calcium and incident cardiovascular disease. And so Peder, to examine this question, the authors implemented a cohort study design that included adults aged greater than 45 years, free of cardiovascular disease, from the Multi-Ethnic Study of Atherosclerosis, or MESA, and after propensity score matching in a one-to-one ratio, they applied a machine learning causal forest model to, first, evaluate the heterogeneity in the association between positive coronary artery calcium and incident cardiovascular disease and then, second, to predict the increase in cardiovascular disease risk at 10 years when the coronary artery calcium score was greater than zero, so versus is it zero at all at the individual level? Dr. Peder Myhre: Oh, Greg, that is so cool, so using machine learning for coronary artery calcium and risk prediction, I'm very excited. What did they find? Dr. Greg Hundley: Right, Peder, so the expected increases in cardiovascular disease risk when the coronary artery calcium score was greater than zero were heterogeneous across individuals. Moreover, nearly 70% of people with low atherosclerotic cardiovascular disease risk showed a large increase in cardiovascular disease risk when the coronary calcium score was greater than zero, highlighting the need for coronary artery calcium screening among such low-risk individuals. And Peder, future studies are really needed to assess whether targeting individuals for coronary artery calcium measurements based on not only the absolute ASCVD risk, but also the expected increase in CVD risk when a CAC score is greater than zero and whether that improves overall assessment of cardiovascular outcomes. Dr. Peder Myhre: Wow, that is so clinically relevant and very interesting. And we're actually going to stay clinically relevant with the next paper which is about anti-platelet therapy after PCI. And this paper describes the long-term results of the HOST-EXAM trial. To remind you, Greg, the HOST-EXAM trial was an investigator-initiated prospective, randomized, open label, multicenter trial done at 37 sites in Korea. They enrolled patients who had undergone PCI with DES and maintained dual anti-platelet therapy without any clinical event for a mean 12 months and then they were randomized one to-one to either clopidogrel, 75 milligrams once daily, or aspirin, 100 milligram once daily. The primary results of this trial was published in Lancet in 2021 and showed superiority of clopidogrel over aspirin in prevention of the composite of MACE and major bleeding during 24 months of followup. And then, through the current paper, this describes the results of the post trial extended followup of about five years. Dr. Greg Hundley: Very nice, Peder, so aspirin versus clopidogrel and looking at the maintenance of that monotherapy and cardiovascular outcomes. Wow, so what did they find? Dr. Peder Myhre: Yeah, Greg. They, in this extended followup study, had a total of 5.8 years median followup, and the primary endpoint occurred in 12.8% in the clopidogrel group versus 16.9% in the aspirin group, and that has a range of 0.74 with a 95% conference interval ranging from 0.63 to 0.86. So also the clopidogrel group had lower risk of the secondary thrombotic endpoint and the secondary bleeding endpoint while there was no significant difference in the incident on all caused death. So Greg, to conclude, these very interesting results from the primary analysis of the HOST-EXAM trial was consistent through the longer followup, and this support the use of clopidogrel over aspirin monotherapy from 12 months onwards after PCI. Dr. Greg Hundley: Very nice Peder, beautiful description and sounds like long-term clopidogrel use over aspirin was quite beneficial. Well, the next study comes to us from the world of preclinical science, and it is from the investigative group led by Dr. Yunzeng Zou from Shanghai Institute of Cardiovascular Diseases and the Zhongshan Hospital and Fudan University. Peder, the study pertains to diabetes. So diabetic heart dysfunction is a common complication of diabetes mellitus and cell death is a core event that leads to diabetic heart dysfunction. However, the time sequence of cell death pathways and the precise intervening time of particular cell death type remained largely unknown in diabetic hearts. And so, Peder, this study aimed to identify the particular cell death type that is responsible for diabetic heart dysfunction and propose a promising therapeutic strategy by intervening in this cell death pathway. Dr. Peder Myhre: Wow, Greg, that is really interesting. Heart dysfunction in diabetes is something that we really have to learn more about and I'm so excited to hear what these authors found, Greg. Dr. Greg Hundley: Right. So first, Peder, the authors identified necroptosis as the predominant cell death type at later stages in the diabetic heart. And then second, Peder, the CB2 receptor, and we'll call that CB2-R, recruits transcription factor Bach2 to repress necroptosis and protects against diabetic heart injury while hyperglycemia and MLKL in turn phosphorylates CB2-R to promote ubiquitous dependent degradation of CB2-R, thus forming a CB2-R centric feedback loop of necroptosis. And finally, Peder, cardiac CB2-R or Bach2 expression negatively correlates with both MLKL 10 expression and the extent of diabetic heart injuries in humans. And so the clinical implications of these findings, Peder, are that the CB2-R centric necrotic loop represents a promising target for the clinical treatment of diabetic heart injuries. Dr. Peder Myhre: So Greg, this paper that comes to us from corresponding author Amanda Paluch from University of Massachusetts Amherst, is a meta-analysis of eight prospective studies with device measured steps including more than 20,000 adults who were followed for CVD events. And the mean age of participants in this study was 63 years and 52% were women. And the participants were followed for a median of 6.2 years and 1,523 cardiovascular events occurred. So first, Greg, there was a significant difference in the association of steps per day in cardiovascular disease between older, that is greater or equal to 60 years, and younger, that is less than 60 years adults. So for older adults that has the ratio for cardiovascular disease using Q1 as reference was 0.80 for Q2, 0.62 for Q3, and 0.51 for Q4. And for younger adults that has ratio for cardiovascular disease using Q1 as reference was 0.79 for Q2, 0.90 for Q3, and 0.95 for Q4. And in the paper, Greg, there are some beautiful, restricted cubic lines that really illustrate the association between daily steps and the risk of cardiovascular disease among older adults and in younger adults. So the authors conclude that for older adults taking more daily steps is associated with a progressively lower risk of cardiovascular disease. And monitoring and promoting steps per day is a simple metric for clinician patient communication and population health to reduce the risk of cardiovascular disease. Dr. Greg Hundley: Well, Peder, we've got some other very interesting articles in this issue and how about we dive into that mail bag and discuss a few of those. So I'll go first. The first is a Perspective piece by Professor Powell-Wiley entitled “Centering Patient Voices through Community Engagement in Cardiovascular Research.” A very important topic where can those in the community actually help us design meaningful outcomes for our research initiatives? And next Peder, there is a Research Letter from Professor Evans entitled “Increasing Mononuclear deployed Cardiomyocytes by Loss of E2F7/8, and does that fail to improve cardiac regeneration post myocardial infarction?” Dr. Peder Myhre: Thanks, Greg. We also have an ECG Challenge by Dr. Li entitled, “What Is The Truth Behind Abnormal ECG Changes?” And this is describing a very rare and interesting cause of ST segment elevation. I recommend everyone to read that case. We also have our own Nick Murphy who gives us the Highlights from the Circulation Family of Journals where he summarizes five papers from the Circulation subspecialty journals. First, the experience with a novel visually assisted ablation catheter is reported in circulation A and E. The impact of various exercise training approaches on skeletal muscle in heart failure with preserved the F is presented in circulation heart failure. Gaps in heart failure treatment over a decade are reported in circulation cardiovascular quality and outcomes, and the associations of machine learning approaches to plaque morphology from coronary CTA with ischemia are reported in circulation cardiovascular imaging. And finally, Greg, an observational study of left main PCI at sites with and without surgical backup is reported in circulation cardiovascular interventions. Let's go on to the feature paper today describing the cardiac troponin I interacting kinase and the impact on cardiomyocyte S phase activity. Dr. Greg Hundley: Great, let's go. Welcome listeners to this January 10th feature discussion. Very interesting today as we are going to delve into the world of preclinical science. And we have with us today Dr. Loren Field and Dr. Sean Reuter from University of Indiana in Indianapolis, Indiana. And our own associate editor, Dr. Thomas Eschenhagen from University Medical Center of Hamburg in Hamburg, Germany. Welcome gentlemen. Well, Loren, we're going to start with you. Can you describe for us some of the background information that went into the preparation of your study, and what was the hypothesis that you wanted to address? Dr. Loren Field: Sure. This study actually came about in a rather roundabout fashion. We were doing a study with Kai Wollert in Hanover, Germany, where we were looking at the impact of a CXCR4 antagonist, which is used to mobilize stem cells from the bone marrow. And we had sent our mice over to Kai's lab and we have a mouse model that allows us to track S phase activity in cardiac myocytes, so these are cells are starting to replicate. And Kai crossed them into a different genetic background. And when he sent the mice back to us to analyze the hearts, we observed that we saw things that we never saw before in our experiments here. His injury model was different than ours and now the mouse also had a genetic background, so we had to spend about a year to figure out if it was the injury model or the background. It turned out to be the genetic background, and the phenotype was these mice had about a 15-fold elevated level of cell cycle reentry. So then it became a relatively simple genetics game where we took the progenitor mice, made F1 animals, looked for the phenotype, did backcross animals, and basically identified the gene responsible for the phenotype. Dr. Greg Hundley: Very nice. And so in this study moving forward, what hypothesis did you want to address? Dr. Loren Field: Well, the main hypothesis was to figure out what the gene was and then secondarily to figure out the degree of cell cycle progression. When the cell is proliferating, the first task is to replicate its genome, which is S phase activity that's followed by the nuclei dividing and then finally by the cell itself becoming two cells. So our task was to identify, first, the gene and secondly, how far through the cell cycles the cells progressed. Dr. Greg Hundley: Very nice. And how did you construct your experiment? Dr. Loren Field: It was, again, very straightforward. It was simply setting up the appropriate genetic crosses to produce the animals. For the past 10, 15 years, we've been developing a computer assisted assay that allows us to identify the anatomical position of S phase positive cardiac myocytes in sections of the heart. And basically, we apply that program to the different genetic backgrounds and after that it's a ball of mapping studies, QTL mapping. Dr. Greg Hundley: So really mechanistic understanding. Well listeners, we're next going to turn to Sean, and Sean, can you describe for us your study results? Dr. Sean Reuter: Yes, as Loren stated, we saw a 15-fold increase in the S phase activity within the remote zone. Now we partition the heart in three different zones after injury, so the scar, the border zone, and then the remote zone or injury. And as Loren stated, we saw a 15-fold increase in the S phase activity, cell cycle activity, in the remote zone. And it's only because we have this system in hand that we can anatomically map the S phase activity within the heart that we were able to detect and also quantify this. And I think that's the reason we discovered this particular phenotype. But in addition to that, we performed RNA-seq or Exome sequencing and discovered that TNNI3K was the responsible gene for elevated S phase activity within the remote zone and border zone, but interestingly not in the scar. Dr. Greg Hundley: Very interesting, Sean, and so describe for us the importance of the TNNI3K and its relationship to this S phase. Dr. Sean Reuter: Sure. This particular gene was first discovered around 2000, and it's been studied for a while now, but the targets of this kinase specifically expressed in the heart, and it does get elevated after injury, but the actual targets are not well described or well known. It's believed that it phosphorylates some mild filament fibers and structural proteins, but the actual mechanism and the consequence of this is not known. So when we saw this in the remote zone, the elevated S phase, our current theory is that we believe that it's probably increasing oxidative stress that would basically further out from the at-risk zone or the border zone and then it now is in the remote zone. So we think it's just causing the heart, a pathological area of the heart, basically to expand. And so that's our current theory. Other groups have published on the oxidative stress in over expression of TNNI3K as well. Dr. Greg Hundley: Very nice. Well listeners, next we are going to turn to our associate editor, Thomas many articles come your way and come across your desk. What attracted you to this particular article, and how do we put its results really in the context of cardiac regeneration? Dr. Thomas Eschenhagen: Indeed, there were several arguments. It's a cool paper and the whole field is still very important. As probably most of you know, the field have a rough ride over the last 20 years, went up and down, lots of bad findings. And in the end it turns out that we are there where we have been 20 years ago, the mammalian heart essentially doesn't regenerate. So anything which would improve that would be of very major importance. Why is it a good paper? Because it starts from a very clear finding, one mouse, which looks like strongly regenerating after MI, another mouse line, which doesn't. And so by applying, let's say, classical genetic, very stringent methodology, Loren Field and his group identified this troponin I kinase to be the culprit. And they also proved it, because putting it back in the strain with a low, so-called, regeneration brought it back to the other level. So it's a very clear, nice methodology. And finally, it's also a bit provocative because others in a very prominent paper, actually, have shown that this kinase... Or they concluded more or less just the opposite. The reason for the discrepancy is not quite clear and I was very happy to learn that the two groups actually discussed about it. So it's not just a bad controversy, but something which brings forward science. And finally, I think something we didn't talk about yet today, what I particularly liked, maybe the most, on this paper is that this group didn't stop at the point of DNA synthesis. Everybody else would've probably said, "Okay, here we are, one regenerate the other doesn't." But in the very important extra finding of this paper is that this is just increased DNA synthesis and not more myocytes. And this distinction is so critical to the field because people forget that adult mammalian cardiomyocytes often have several nuclei and individual nuclei have more than one set of chromosomes, so this polyploid. And so if you see DNA synthesis like in this paper, it doesn't necessarily mean more myocytes. And actually here it was shown that it is not more myocytes but more polyploidization and making this difference so clear, I think it's a very important contribution to the field. Dr. Greg Hundley: Very nice. Well, listeners, we're going to turn back to each of our guests today and we'll start with you Loren. Based on your results, what do you see as the next study moving forward in this sphere of research? Dr. Loren Field: I think these results made me appreciate for the first time that the intrinsic level of cell cycle reentry, that's just the S phase, not the cell division, is actually much higher than I had thought previously. And this was because we just fortuitously, or I guess anti-fortuitously, we're using a strain that had low levels of S phase induction. If you calculate the turnover, if every nucleus that it synthesized DNA actually went on to have that cell divide, you could replace a 50% loss of myocytes over the course of about 550 days, give or take. And to me, that's actually telling me that if we could push those cells from just being polypoid, as Thomas was saying, to actually go through cytokinesis, there would be enough intrinsic activity to go forward. So this really tells me that what we should be focusing on is now not trying to induce cell cycle, but to allow the cells that are entering the cell cycle to actually progress through it. Dr. Greg Hundley: Very nice. And Sean? Dr. Sean Reuter: Yes, well, echoing Loren's point there, it's really not necessarily cell cycle induction, it's cell cycle completion to the cytokinetic fate. And that's the key. If we can get to that point, if we can figure out the mechanism to get to that point, then we have a wonderful discovery. However, we're not quite there yet, but we hope to be. Dr. Greg Hundley: And Thomas. Dr. Thomas Eschenhagen: Well, nothing to add really from my side, except that I would like to know what this Troponin I kinase does, because that is somehow still a missing link. How does this kinase lead to more DNA synthesis or the initiation of cell cycling? That would be an important finding and I'm sure there will be more research going on. Particularly also, to solve this discrepancy, I mean, there must be something in it and we don't quite yet know how, but I think we are in a good way. I'm sure there will be papers showing that soon. So I think that's, again, a very good start for this discussion. Dr. Greg Hundley: Well, listeners, we want to thank Dr. Loren Field, Dr. Sean Reuter and Dr. Thomas Eschenhagen for bringing us this really informative study in mammalian myocellular regeneration, highlighting that the level of cardiomyocyte cell cycle reentry in hearts expressing TNNI3 kinase would lead to significant regenerative growth if each cardiomyocyte exhibiting S phase activity was able to progress through cytokinesis. And this in turn suggests that identification of factors which facilitate cardiomyocyte cell cycle progression beyond S phase will be key to unlocking the intrinsic regenerative capacity of the heart. Well, on behalf of Carolyn, Peder and myself, we want to wish you a great week and we will catch you next week on the run. This program is copyright of the American Heart Association 2023. The opinions expressed by speakers in this podcast are their own and not necessarily those of the editors or of the American Heart Association. For more, please visit ahajournals.org.

This week on Seizing Life, Lacey Smith of Boston Children's Hospital takes us on a deep dive into genetic testing and counseling; what it is, how it works, who should consider it, what it can provide for patients and families, and what it may promise for the future of epilepsy knowledge and care. The post Genetic Testing & Counseling for Epilepsy From Genome to Exome and More appeared first on CURE Epilepsy.

This week on Seizing Life we take a deep dive into genetic testing and counseling; what it is, how it works, what it can provide for patients and families, and what it may promise for the future of epilepsy knowledge The post Genetic Testing & Counseling for Epilepsy From Genome to Exome and More appeared first on CURE Epilepsy.

Congenital anomalies (CA), developmental delay (DD), and intellectual disability (ID) are among the most common indicators in children that lead to genetic testing. Identification of an underlying diagnosis for CA or DD/ID can be consequential to care management and long-term prognosis for the child. But there has been no evidence-based guideline for clinicians to refer to that supports the use of exome or genome sequencing as a first-line or second-line test for the evaluation of pediatric patients with CA or DD/ID. On this month's GenePod, Fuki Hisama, MD, FACMG, FAAN and Murugu Manickam, MD, FACMG, who co-chaired the American College of Medical Genetics and Genomics (ACMG) evidence-based work group, discuss how a team of experts was brought together to provide the ACMG's first ever evidence-based clinical guideline. This guideline lays out clear recommendations for use of exome or genome sequencing in clinical care to optimize outcomes for pediatric patients with CA or DD/ID. “In a way, this model of an evidence-based guideline is creating the standard and a template for future studies” says Dr. Manickam. See acast.com/privacy for privacy and opt-out information.

CPLF 2020 – Fil orange. A23 – Prédiction du risque de maladies respiratoires

In newborn screening tests, after a first-tier abnormal screening result, single gene or multi-gene testing panels are often utilized as second- or third-tier tests. However, the technologies typically employed today do not scale well and this is a real problem for the high-volume rapid throughput nature of newborn screening labs. On this month’s GenePod, Drs. Nicole Ruiz-Shultz and Andreas Rohrwasser of the Utah Public Health Laboratory discuss how they tested targeted exome sequencing, which focuses analysis on the most relevant subset of genes. See acast.com/privacy for privacy and opt-out information.

Editor's Summary by Howard Bauchner, MD, Editor in Chief of JAMA, the Journal of the American Medical Association, for the February 2, 2021 issue

Dr. Daniel Geschwind Bio: Dr. Geschwind is the Gordon and Virginia MacDonald Distinguished Professor of Human Genetics, Neurology and Psychiatry at UCLA. In his capacity as Senior Associate Dean and Associate Vice Chancellor of Precision Health, he leads the Institute for Precision Health (IPH) at UCLA, where he oversees campus precision health initiatives. In his laboratory, his group has pioneered the application of systems biology methods in neurologic and psychiatric disease, with a focus on autism spectrum disorders (ASD) and neurodegenerative conditions. Dr. Geschwind is a pioneer in the transcriptomic and functional genomic analyses of the nervous system. His laboratory showed that gene co-expression has a reproducible network structure that can be used to understand neurobiological mechanisms in health and disease. He led the first studies to define the molecular pathology of autism and several other major psychiatric disorders, and has made major contributions to defining the genetic basis of autism. He demonstrated the utility of using gene network approaches to discover new pathways involved in neurodegeneration and new approaches to facilitate neural regeneration.  More recently, his laboratory demonstrated how knowledge of 3-dimensional chromatin structure can be used to understand the functional impact of human genetic variation. Dr. Geschwind has trained over 70 graduate students and post-doctoral research fellows, and is among the highest cited scientists in neurology, neuroscience and genetics (H index > 140). In addition to serving on several scientific advisory boards, including the Faculty of 1000 Medicine, the Scientific Advisory Board for the Allen Institute for Brain Science, the NIMH Advisory Council and the NIH Council of Councils, he currently serves on the editorial boards of the journals Cell, Neuron and Science. He has received several awards for his laboratory's work is an elected Member of the American Association of Physicians and the National Academy of Medicine.   What can big data and genomics offer the individual regarding medical treatment? Dr. Daniel Geschwind is here to explain exome sequencing data analysis as well as how this field might expand and progress. Listen and learn What makes up our genome, how to understand the terms for each part, like exon, intron, and exome, and what parts are effected epigenetically; Why genomics testing still focuses on that 2 to 3 percent of the genome called the exome that codes for proteins; and How sequencing will broaden and change, making preventative care that much more effective for certain patients and more. Dr. Daniel Geschwind is the Gordon and Virginia MacDonald Distinguished Professor in Neurology, Psychiatry, and Human Genetics; the Senior Associate Dean and Associate Vice Chancellor for Precision Health at UCLA; and the director of the Center for Autism Research and Treatment at the Semel Institute at UCLA David Geffen School of Medicine. He opens up the world of genomics for listeners, explaining why an exome sequencing test is the center of precision medicine currently. He explains how the exome is composed of the 3% of your genome that actually codes for protein sequences. What's the rest of the genome up to? Well, scientists believe that remainder of your genome is busy regulating those sequences, determining levels and turning gene expressions on and off.  He explains how scientists use the exome sequencing process. In fact, the majority of people who say they've been sequenced mean, in fact, that their exome has been sequenced. Whole genome sequencing costs about three times as much but offers scientists the same information at this point. However, he thinks this will soon change. As the exome sequencing project continues and our knowledge accumulates, the benefits will increase from whole genome sequencing. The costs are likely to drop as well.  Once it gets inexpensive enough and we have sequenced hundreds of millions of patients with a variety of disorders, we will have much better predictive power.  For more information, he suggests UCLA's Precision Health website. Available on Apple Podcasts: apple.co/2Os0myK

This week’s episode features author Jaime Layland and Associate Editor Dharam Kumbhani as they discuss the ariticle "Colchicine in Patients with Acute Coronary Syndrome: The Australian COPS Randomized Clinical Trial." TRANSCRIPT BELOW: Dr. Carolyn Lam: Welcome to Circulation on the Run, your weekly podcast, summary, and backstage pass to the journal and its editors. I'm Dr. Carolyn Lam, associate editor from the National Heart Center and Duke National University of Singapore. Dr. Greg Hundley: And I'm Dr. Greg Hundley, associate editor, director of the Pauley Heart Center, VCU Health, in Richmond, Virginia. Dr. Carolyn Lam: Greg, for our feature discussion we're talking about a very hot topic these days, the role of colchicine, this time in patients with acute coronary syndrome, with Australian data. I cannot wait to get to that, but I'm going to make you wait because I want to tell you about a whole lot of other really cool papers in today's issue. Dr. Carolyn Lam: First, have you ever wondered what is the association between risk factor control and cardiovascular disease risk in type 2 diabetes? Well, today's paper answers that. It's from Dr. Wright from University of Manchester and her colleagues who looked at a retrospective cohort using data from the English practices from Clinical Practice Research Datalink, or CPRD, and the Scottish Care Information diabetes dataset. They also linked to hospital and mortality data and identified more than 101,000 patients with type 2 diabetes in CPRD matched with almost 379,000 controls without diabetes and almost 331,000 patients with type 2 diabetes in the Scottish Care Information diabetes database between 2006 and 2015. The main exposure was a number of optimized risk factors, and these are: (1) Nonsmoker; (2) total cholesterol less than 4 mmol/L; (3) triglycerides less than or equal to 1.7 mmol/L; (4) HB A1c less than 7%; and (4) systolic blood pressure less than 140 or less than 130 mmHg of high risk. Dr. Greg Hundley: Carolyn, I am very curious. Lots of data here. What did they find? Dr. Carolyn Lam: So the key findings were: Dr. Carolyn Lam: First, even with optimally managed risk factors, people with type 2 diabetes still had a 21% higher risk for all cardiovascular disease events and non-fatal coronary heart disease, and a 31% higher risk of heart failure hospitalization compared to patients without diabetes. Dr. Carolyn Lam: 2. Only 6% of people with type 2 diabetes had optimal risk factor controls, so a very low percent. Dr. Carolyn Lam: 3. The association between the number of elevated risk factors and cardiovascular disease events and mortality was much stronger in patients with type 2 diabetes but without cardiorenal disease compared to those with established cardiorenal disease. People without cardiorenal disease were also younger and more likely to have suboptimal risk factor control and fewer prescriptions for risk-factor-modifying medication. Dr. Carolyn Lam: So take-home message: Greater use of guideline-driven care, clinical decision support, drug intervention, and self-management support should be encouraged for risk factor control, and people with type 2 diabetes and without cardiorenal disease may especially benefit greatly from cardiovascular disease risk factor intervention. Dr. Greg Hundley: Very nice, Carolyn. Dr. Greg Hundley: Well, my first study comes from Dr. Gregory Lewis from Mass General Hospital in Boston, Massachusetts. Carolyn, another quiz: Have you wondered about differences in metabolism in those who exercise versus those that do not? Dr. Carolyn Lam: Greg, I wonder about that all the time when I'm running out there. Dr. Greg Hundley: In this study, cardiopulmonary exercise testing, or CPET, and metabolite profiling was performed on Framingham heart study participants aged about 54 years with 63% of them being women with blood drawn at rest in 471 subjects and then again at peak exercise in 411. Dr. Carolyn Lam: Nice, and kudos for the majority women. So what were the results? Dr. Greg Hundley: The authors observed changes including reductions in metabolites implicated in insulin resistance and increases in metabolites associated with lipolysis, nitric oxide bioavailability, and adipose browning. Exercise-induced metabolite changes were variably related to the amount of exercise performed, peak workload, sex, and body mass index. There was attenuation of favorable exercise excursions in some metabolites in individuals with higher BMI and greater excursions in select cardioprotective metabolites in women despite less exercise being performed. Four metabolite signatures of exercise response patterns were analyzed in a separate cohort. The Framingham offspring study of 2,045 were about age 55 years and 51% were women, two of which were associated with overall mortality over a median follow-up at 23 years. Dr. Greg Hundley: So Carolyn, in conclusion, the authors found acute exercise elicits widespread changes in the circulating metabolome. These findings provide a detailed map of the metabolic response to acute exercise in humans and identify potential mechanisms responsible for the beneficial cardiometabolic effects of exercise that could be useful in future studies. Dr. Carolyn Lam: Beautiful. I'm going to keep exercising and I bet you will, too, Greg. Dr. Carolyn Lam: So this next paper is a mechanistic study that revealed a special population of tissue regulatory T-cells in the heart with a unique phenotype and pro-repair function. So this comes from corresponding author Dr. Cheng from Tongji Medical College of Huazhong University of Science and Wuhan Hubei, China. He and his colleagues studied the dynamic accumulation of regulatory T-cells in the injured myocardium in mouse models of myocardial infarction, myocardial ischemia re-perfusion injury, or cardiac cryo injury, and using state-of-the-art methods such as bulk RNA sequencing, photo conversion, parabiosis, single-cell TCR sequencing, adoptive transfer, and functional assays. Dr. Greg Hundley: Carolyn, interesting. What did they find? Dr. Carolyn Lam: They showed that regulatory T-cells that accumulate in the injured myocardium after myocardial infarction or myocardial ischemia re-perfusion injuries had a distinct transcriptome which differs from lymphoid organ regulatory T-cells and other non-lymphoid tissue, and this represents a novel population of tissue regulatory T-cells in the heart. These heart regulatory T-cells were mainly thymus driven and recruited from the circulation showed active local proliferation with the IL-33/ST2 axis promoting their expansion. With the phenotype of promoting tissue repair, heart regulatory T-cells over-expressing spark contributed to elevated collagen content and enhanced maturation in infarct scars to prevent cardiac rupture and improve survival after myocardial infarction. Dr. Carolyn Lam: So in summary, this paper identified and characterized a phenotypically and functionally unique population of heart regulatory T-cells, which may lay the foundation to harness these cells for cardiac protection in myocardial infarction or other cardiac diseases. Dr. Greg Hundley: Wow, Carolyn. Very interesting. Dr. Greg Hundley: Well, my next paper comes from Dr. Michael Rubart from Indiana University School of Medicine, and as some background it's going to discuss calmodulin. So calmodulin mutations are associated with arrhythmia syndromes in humans. Exome sequencing previously identified a de novo mutation in CALM1 resulting in a P.N98S substitution in a patient with sinus bradycardia and stress-induced bidirectional ventricular ectopy. The objectives of the present study were to determine if mice carrying this N98S mutation knocked into CALM1 replicate the human arrhythmia phenotype and then to examine some of the arrhythmia mechanisms. Dr. Carolyn Lam: Okay. So what did they find? Dr. Greg Hundley: Carolyn, several techniques were used in this study. Mouse lines heterozygous for the CALM1 N98S allele generated using CRISPR and caspase 9 technology. Also, adult mutant mice and their wild-type litter mates underwent electrocardiographic monitoring. Ventricular D and re-polarization was assessed in isolated hearts using optical voltage mapping, and action potentials in wholesale currents as well as calcium influx were measured in single ventricular myocytes using patch-clamp techniques and fluorescence microscopy, respectively. Microelectrode techniques were employed for in situ membrane voltage monitoring of ventricular conduction fibers. Carolyn, it was really a comprehensive study. Dr. Greg Hundley: So what did the authors find? Heterozygosity for the CALM1 N9S mutation was causative of an arrhythmia syndrome characterized by sinus bradycardia, QRS widening, adrenergically mediated QTC interval prolongation, and bidirectional ventricular tachycardia. Second, beta adrenergically induced calcium influx L dysregulation contributed to the long QT phenotype. And finally third, they found that pause dependent early after depolarizations and tachycardia induced delayed after depolarizations originating in the His-Purkinje network and ventricular myocytes, respectively, constituted potential sources of arrhythmia in the CALM1 N98S positive hearts. Dr. Carolyn Lam: Wow. Sounds like a really comprehensive study. Thanks, Greg. Dr. Carolyn Lam: Let's talk about some other papers in this issue, shall we? There is a Perspective piece by Dr. Klassen on the COVID-19 pandemic, a massive threat for those living with cardiovascular disease among the poorest billion. There's an ECG challenge by Dr. Littman on a malignant electrocardiogram. Here's a hint: It's a pseudo-infarct pattern with important learnings. They're in an exchange of letters between Drs. Packard and Schwartz regarding the role of lipoprotein A and modification by alirocumab, a pre-specified analysis of ODYSSEY Outcomes randomized clinical trial. Dr. Greg Hundley: Oh thanks, Carolyn. I've got a couple other papers. Dr. Venkateswaran Subramanian has a Research Letter entitled Lysyl Oxidase Inhibition Ablates Sexual Dimorphism of Abdominal Aortic Aneurysm Formation in Mice. Professor Jan Cornell has another research letter entitled Colchicine Attenuates Inflammation Beyond the Inflammasome in Chronic Coronary Artery Disease. The LoDoCo2 proteomic substudy. And then finally, Dr. Sanjay Kaul from Cedars-Sinai Medical Center has a white paper reviewing the benefit/risk trade-offs in assessment of new drugs and devices. Dr. Greg Hundley: Well, Carolyn, how about we get on to that feature discussion and learn more about colchicine and acute coronary syndromes. Dr. Carolyn Lam: Yeah. Let's go, Greg. Today's feature discussion is all about colchicine, that commonly used treatment for gout that has recently emerged as a novel therapeutic option in cardiovascular medicine. I am so pleased to have with us the corresponding author of today's paper, Dr. Jamie Layland from Monash University, as well as our associate editor, Dharam Kumbhani, from UT Southwestern to discuss this very important trial data from Australia. Jamie, could you start us off by telling us all about this Australian COPS trial? Dr. Jamie Layland: We performed the Australian COPS trial back in 2015, and it finished recruiting in 2018. Essentially the trial was a trial to look at the safety and efficacy of colchicine being used in acute coronary syndromes, and this was prior to the release of important trial COLCOT. So essentially we randomized patients who presented to the hospital with an acute coronary syndrome to receive colchicine twice daily for one month followed by colchicine once a day for 11 months, and we followed these patients up for a minimum of 12 months. This was performed across 17 sites across Australia, and we looked at a composite endpoint of total death, acute coronary syndromes, unplanned urgent revascularization, and stroke. Dr. Carolyn Lam: Nice. So Jamie, could I first clarify that this was an investigator-led trial, I'll bet, and man, first of all, applause for doing this. I can only imagine how much work this took and maybe then tell us about the results. Dr. Jamie Layland: Yeah. So this was an investigator-initiated trial through a network of academic investigators across Australia on limited research funding, so through philanthropic and institutional support. So it was a huge effort over a number of years, and I'm very thankful to the support of Circulation and Dharam in supporting the paper, which I think was a great success. Dr. Jamie Layland: So the results of this trial were a surprise to us all, but essentially this was a negative trial in the sense that colchicine did not improve the primary outcome, so there was no improvement in the rate of the COLCOT outcome. And interestingly, there was an increase in total mortality, in particular non-cardiovascular deaths were higher at five compared to the placebo at one. That was over a 12-month follow-up period. Dr. Carolyn Lam: Interesting. So Jamie, I'm going to ask the question that's on everyone's mind then: What's the difference between your trial and COLCOT? Dr. Jamie Layland: That's a great question. Obviously, COLCOT was a much larger trial. COLCOT was an international trial of over 4,000 patients. Similar patient demographics, similar patient subgroup of acute coronary syndromes. However, importantly, COPS was a trial of inpatient initiation of colchicine. So patients when they had their STEMI, or non-STEMI most commonly, they were given colchicine usually within 72 hours of their index hospitalization and sometimes sooner, and this was given prior to discharge. With COLCOT, the median time of administration of colchicine was around 14 days, so slightly different groupings there. However, in COLCOT you were allowed to administer colchicine as an inpatient. You can see obviously from the European side of cardiology the impressive data when colchicine was given earlier in COLCOT how this translated to improved outcomes. So clearly, there is a potential benefit there for early administration of colchicine when you look at these two trials. Dr. Jamie Layland: But we administered colchicine acutely when patients presented in their index hospitalization. We also importantly used a different dosing schedule to COLCOT. So COLCOT was 0.5 mg daily and we used 0.5 twice daily. This was for the first 30 days, and this was based on early data from the group from western Australia who showed that when colchicine was given to patients at a BD dosing in those patients who were already on aspirin and high-potency statins, there was a significant reduction in hsCRP, obviously a commonly used marker of inflammation at four weeks, and also based on data showing that there was a heightened inflammatory response in the early days following an acute coronary syndrome. So we felt that using this twice-daily dose would be advantageous and potentially helpful for our patients. So they're the two main differences between the studies. Dr. Carolyn Lam: Thanks for explaining that so clearly. Dharam, could I have your thoughts? This was, of course, discussed heavily, right, by the editors. Could you give us a sneak peek of what else was discussed? Dr. Dharam Kumbhani: The trial is very important, although it is smaller perhaps in sample size and kind of done with less resources than COLCOT. I do think this adds to the body of literature on colchicine for secondary prevention of CAD. And one of the interesting things is that we see we also have the LoDoCo2 trial, which was a slightly different population, Jamie, which was the chronic coronary artery disease patients, but also still looking at secondary prevention. What is really striking to me is that a very similar signal in non-CV death was noted in that trial as well. Again, it was not seen in COLCOT and LoDoCo1, but it was very interesting that a similar finding was there. So I do think this is something that the field will need to investigate more and really try to understand is this just noise and by chance alone, or is this something that that's a real signal for. Dr. Carolyn Lam: Jamie, what are your thoughts about that and in LoDoCo differences with your trial? Dr. Jamie Layland: Good question, and a very important topic that obviously is currently under discussion amongst the colchicine community. As I said, it was a surprising result. We weren't anticipating this non-CV death signal, but as Dharam said when LoDoCo2 came out, a fantastic trial again, but this signal of non-CV death. I don't know whether it's merely just a noise as you say or whether it's a significant finding, but clearly we need to do more research in this field to understand the mechanism and whether this is a real signal or not. It seems a little bit discordant with previously published work. So if you look at the literature in patients with gout from across the world, there's no real signal of increased non-CV death in those patients. However, with patients with acute coronary syndrome as we are administering the colchicine on a daily basis and then commonly this isn't used for gout, so that is a slight difference. But certainly, there was no signal in the non-CV literature to support the findings that we had and the signal in LoDoCo2. Dr. Jamie Layland: The other thing to note is in a cohort of five non-CV deaths, three out of those five patients were actually not taking colchicine at the time of their death. They stopped the drug prematurely. So I think we just need to take a step back and really await the results. Obviously, we've got two-year and five-year data coming out from the COPS trial which will be interesting to look at, but also the Clear Synergy trial from the McMaster team, that would be a very important trial providing more data on this potential signal. But reassuringly, and I feel more reassured knowing the COLCOT data, which is a slightly similar cohort to ours, showing that there was no trend towards increased non-CV deaths. So I think it's something that we have to be aware of and there will be lots of metro-analysis I'm sure being published in the coming months looking at this specifically. But yeah, I think we shouldn't cast any aspersions on colchicine yet. I think that's too early, but I do think we need more data. Dr. Carolyn Lam: Thanks, Jamie. Speaking of looking deeper in your data and looking at those who died and were they taking the medication and so on, you did some other post-hoc analysis, right? And maybe you could just describe briefly, for example, the 400-day followup. Dr. Jamie Layland: Yes. So the interesting thing with our data, and I had mentioned this before, is that we had limited resources, so we really wanted to do this trial, and obviously competitive funding is tricky at the best of times, but we were really committed to doing this trial and we had a group of investigators who were all committed to doing this trial. But for this to work, we had a single research nurse and a fellow performing the follow-up. So at times, there was a little lag between the timing of the follow-up. So we ended up getting follow-up which was slightly prolonged over the 12-month window. On average, it was around 400 days. When we looked at the 400-day data, we saw that there was an increasing separation of the biomarkers after 365 days. Dr. Jamie Layland: The results, this was obviously not the primary outcome, this was a sensitivity analysis, but there was a suggestion or a significance out to 400 days with an improvement with colchicine. However, this is the primary composite outcome, so revascularization, acute coronary syndrome, stroke, and total death notwithstanding this positive outcome, there was still this trend to high rate of mortality, so that has to be taken into consideration. But there was a suggestion that the longer the duration of colchicine was given for, it culminated into these lights affect. And we see from CT data that colchicine actually has some plaque-modulating effects and reduces high-risk or low-attenuation plaque. So you could hypothesize that as the majority of the benefits seen in colchicine in LoDoCo2, in COLCOT, and in COPS was the reductions in urgent revascularization, stroke, and acute coronary syndromes. Dr. Jamie Layland: So perhaps there is this effect that colchicine is having on plaque stabilization so we're seeing less longer-term events, but this is just hypothesis generated and we need more data to support that. But it is a very interesting finding nonetheless. Dr. Carolyn Lam: Thank you. Dharam, could I hand you the last word on where you think this field is going or where you think it should go? Dr. Dharam Kumbhani: I think Jamie put it really nicely. I think he outlined the study nicely with its strengths and its limitations, and I think this is obviously a debate between perhaps the colchicine believers and the ones that are still perhaps trying to understand a little bit more about its true role, because as was mentioned I think there's really a benefit in ischemia-driven revasc. I think we've seen that in almost all the colchicine trials. There is no reduction in mortality, and as we saw in the COPS data maybe it goes the other way. So I think from a pathophysiological standpoint it makes sense. I think there's good translational data to suggest that it would be beneficial in this patient population, but I think that's the beauty of having clinical trials and the ones that are done by different investigators and perhaps in different settings, because they help us answer the truth. And whether colchicine becomes a stable part of our armamentarium for secondary prevention of CAD going forward, I think the jury is still out and as was mentioned I think Clear Synergy would probably be very helpful in hopefully tying all this together. Dr. Dharam Kumbhani: So again, I want to congratulate Jamie and his team for really providing us with a very interesting trial done in a very pragmatic setting, and I think the field is very thankful to them for providing us with this information. Dr. Carolyn Lam: Thank you, audience, for joining us today. You've been listening to Circulation on the Run. Don't forget to join me and Greg again next week. Dr. Greg Hundley: This program is copyright the American Heart Association 2020.  

Effective decision making in the Pediatric Intensive Care Unit relies on quickly ascertaining diagnostic information in order to deliver a tailored clinical response. The utility of rapid genetic testing of critically ill patients has been demonstrated several times, owing to their relatively high diagnostic yield. However the cost and slow turnaround of results have been major barriers in the past to the widespread uptake of this technology in the clinical setting. In this episode, we meet Professor Steve Kernie from Columbia University Irving Medical Center and Morgan Stanley Children's hospital, who conducted a pilot study to assess what impact the use of rapid exome sequencing would have on the length of stay of a subset of children admitted to the Pediatric Intensive Care Unit. Have a listen! See acast.com/privacy for privacy and opt-out information.

Interview with Jan M. Friedman, MD, PhD, author of Exome Sequencing and Clinical Diagnosis Related Article(s): Exome Sequencing and Clinical Diagnosis

Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2020.07.19.188789v1?rss=1 Authors: Sin-Chan, P., Gosalia, N., Gao, C., Van Hout, C. V., Ye, B., Marcketta, A., Li, A. H., O'Dushlaine, C., Li, D., Overton, J. D., Reid, J. D., Baras, A., Genetics Center, R., Carey, D. J., Ledbetter, D. H., Rader, D., Ritchie, M. D., Damrauer, S. M., Milman, S., Barzilai, N., Glass, D. J., Economides, A. N., Shuldiner, A. R. Abstract: Aging is characterized by degeneration in cellular and organismal functions leading to increased disease susceptibility and death. Although our understanding of aging biology in model systems has increased dramatically, large-scale sequencing studies to understand human aging are now just beginning. We applied exome sequencing and association analyses (ExWAS) to identify age-related variants on 58,470 participants of the DiscovEHR cohort. Linear Mixed Model regression analyses of age at last encounter revealed variants in genes known to be linked with clonal hematopoiesis of indeterminate potential, which are associated with myelodysplastic syndromes, as top signals in our analysis, suggestive of age-related somatic mutation accumulation in hematopoietic cells despite patients lacking clinical diagnoses. In addition to APOE, we identified rare DISP2 rs183775254 (p = 7.40x10-10) and ZYG11A rs74227999 (p = 2.50x10-08) variants that were negatively associated with age in either both sexes combined and females, respectively, which were replicated with directional consistency in two independent cohorts. Epigenetic mapping showed these variants are located within cell-type-specific enhancers, suggestive of important transcriptional regulatory functions. To discover variants associated with extreme age, we performed exome-sequencing on persons of Ashkenazi Jewish descent ascertained for extensive lifespans. Case-Control analyses in 525 Ashkenazi Jews cases (Males [≥] 92 years, Females [≥] 95years) were compared to 482 controls. Our results showed variants in APOE (rs429358, rs6857), and TMTC2 (rs7976168) passed Bonferroni-adjusted p-value, as well as several nominally-associated population-specific variants. Collectively, our Age-ExWAS, the largest performed to date, confirmed and identified previously unreported candidate variants associated with human age. Copy rights belong to original authors. Visit the link for more info

Genomics is a rapidly evolving technology that can help identify the genetic cause of a condition in a person. It can also find a person’s predisposition to various diseases like some cancers. When science first sequenced all the genes in the entire human genome, it became possible for scientists to compare the genomic patterns of larger groups of people – looking for more clues to health and disease in the ‘big data’. Professor Clara Gaff was awarded the Most Valuable Woman in Leadership in the Biomedical Space for 2019 for her work as Executive Director of the Melbourne Genomics Health Alliance. And the way genomic technology has advanced still stuns her. “The rates of diagnosis using this technology surpasses what I had expected,” she says. “It’s something I could never have imagined.” Episode recorded: May 16, 2019. Interviewer: Dr Andi Horvath. Producer, audio engineer and editor: Chris Hatzis. Co-production: Silvi Vann-Wall and Dr Andi Horvath. Banner image: Shutterstock.

December 2018 See acast.com/privacy for privacy and opt-out information.

Nathan Pearson and Laura Hercher are back for a look over a busy month of headlines. May took us into the era of the free genome as Geisinger planted the genomic medicine flag on an even higher peak. And did you know California was keeping a genetic database for every baby born? Meh. . . says Laura. Every state does it. Old news. And mosaicism is old scientific news, says Nathan, but he likes the way Carl Zimmer brings it to light in a new book. Nathan and Laura then go above and beyond with their own elucidation.

Interview with Seema R. Lalani, MD, author of Use of Exome Sequencing for Infants in Intensive Care Units: Ascertainment of Severe Single-Gene Disorders and Effect on Medical Management

Dr. Paul Wang :                 Welcome to the monthly podcast On the Beat for circulation, arrhythmia and electrophysiology. I’m Dr. Paul Wang editor in chief with some of the key highlights from this month’s issue. We’ll also hear from Dr. Suraj Kapa reporting on new research for the latest journal articles in the field.                                                 The first article in this month's issue is by Yoav Michowitz and Associates who examine the morphological ECG characteristics of left posterior fascicular ventricular tachycardia and differentiated from right bundle branch block and left anterior hemiblock aberrancy. 183 ECGs with left posterior fascicular ventricular tachycardia in patients who underwent ablation were identified using a systematic Medline search were examined and compared to 61 ECGs with right bundle branch block in left anterior hemiblock aberrancy with no obvious cardiac pathology by echocardiography.                                                 Using four variables including atypical right bundle branch block like V1 morphology, positive QRS in aVR, V6R greater than S ratio of less than one and QRS less than or equal to 140 ms, a prediction model was developed that predicted posterior fascicular ventricular tachycardia with a sensitivity of 82% and a specificity of 78%. Patients with three out of four positive variables had a high probability of having left posterior fascicular ventricular tachycardia whereas patients with less than or equal to one positive variable always had right bundle branch block plus left anterior hemiblock.                                                 In the next article, Anna Thøgersen and associates describe a case series of 10 patients in whom implantable cardioverter defibrillators failed to treat ventricular tachyarrhythmias. The authors examine whether consensus derive generic rate threshold cutoffs between 185 and 200 beats per minute were employed in this case series. In nine patients, ventricular fibrillation did not satisfy program detection criteria. Five patients died with untreated ventricular fibrillation, four had cardiac arrest requiring external shocks and one was rescued by a delayed ICD shock. Seven of these patients had slowest detection rates that were consistent with generic recommendations but not tested in a peer review trial for their manufacturer’s ICDs.                                                 In the reported cases, manufacturer specific factors interacted with fast detection rates to withhold therapy including strict ventricular fibrillation episode termination rules, enhancements to minimize T-wave over sensing and features that restrict therapy to regularly rhythms in VT zones. Untreated ventricular fibrillation despite recommended programming accounted for 56% of the deaths and 11% of all of deaths. The authors concluded that complex and unanticipated interactions between manufacturer specific features and generic programming can prevent therapy for ventricular fibrillation.                                                 In the next article, Miguel Rodrigo and associates describe from 17 simulations of atrial fibrillation, atrial flutter and focal atrial tachycardia the ability to understand signal processing that can affect identification of reentrant activity using electrograms, body surface potential mapping and electrocardiographic imaging ECGI phase maps. Reentrant activity was identified by singularity point recognition and raw signals and in signals after narrow band pass filtering at the highest dominant frequency.                                                 Reentrant activity was identified without filtering in 60% of unipolar records but filtering was required to increase reentrant activity detection from 1% to 62% in bipolar recordings. The filtering resulted in residual false reentrant activity in about 30% of bipolar recordings. The authors concluded that rotor identification is accurate and sensitive and does not require additional signal processing in measured or noninvasively computed unipolar electrograms while bipolar electrograms and body surface potential mapping do require highest dominant frequency filtering in order to detect rotors at the expense of a decrease specificity.                                                 In the next article, Raymond Yee and associates examine the ability of a new automated antitachycardia pacing algorithm to reduce ICD shocks. The new automated ATP algorithm was based on electrophysiologic first principles and prescribed the ATP sequences in real time using the same settings for all patients. In 144 patients who had dual chamber or CRT ICDs as well as a history of one or more ICD treated VT or VF episodes or a recorded sustained monomorphic ventricular tachycardia episode. Detection was sent to ventricular fibrillation interval detection of 24 out of 32 ventricular tachycardia interval detection of 16 or greater in a fast VT zone of 242 to 320 ms.                                                 There were 1,626 treated episodes in 49 patients over 14.5 month’s follow up. Data logs permitted adjudication of 702 episodes including 669 sustained monomorphic ventricular tachycardia episodes, 20 polymorphic ventricular tachycardia episodes, 10 SVT episodes and three mal sensing episodes. The novel automated antitachycardia pacing algorithm terminated 39 out of 69 episodes or adjusted 59% of the sustained monomorphic ventricular tachycardia events in the fast VT zone, but 509 out of 590 or 85% adjusted in the VT zone and 6 out of 10 in the VF zone. No SVTs were converted to VT or VF and no anomalous ATP behavior was observed. The authors concluded that this new automated ATP algorithm could be used safely in all zones without need for individualized programming.                                                 In the next study Pablo Ávila and associates studied the incidence and clinical predictors of atrial tachycardias in adults in a cohort of 3,311 patients with congenital heart disease. Prospectively followed in a tertiary center for 37,607 person years. The study patients were divided into three categories; 49% simple, 39% moderate and 12% complex congenital heart disease. In this cohort, 153 or 4.6% of patients presented with atrial tachycardia. The atrial tachycardia burden was highest in complex congenital heart disease such as single ventricle 22.8% or D-TGA 22.1%.                                                 The authors found that univentricular physiology, previous intracardiac repair, systemic right ventricle, pulmonary hypertension, pulmonary regurgitation, pulmonary AV valve regurgitation and pulmonary and systemic ventricular dysfunction were independent risk factors for developing atrial tachycardia. At the age of 40 years, atrial tachycardia free survival in patients with zero risk factors was 100%. With one risk factor, it was 94%. With two risk factors was 76% and three or more risk factors was 50%. These authors confirm these findings in a validation cohort.                                                 In the next article, Khidir Dalouk and associates compare clinical outcomes between ICD patients followed up in a telemedicine videoconferencing clinic and a conventional in person clinic. In this retrospective study, the authors compared time to first appropriate ICD therapy, time to first inappropriate ICD therapy, time to first shock and overall survival. The authors studied 287 patients in the telemedicine videoconferencing clinic group and 236 patients in the conventional in person clinic over mean follow-up duration of 4.8 years. The authors found that telemedicine videoconferencing clinic was not inferior to in person follow-up for the pre-specified outcomes.                                                 In the next article, Elisabeth Mouws and associates studied the epicardial breakthrough waves in sinus rhythm possibly giving insight to the arrhythmogenic substrate in atrial fibrillation. In 381 patients with ischemic or valvular heart disease, intraoperative epicardial mapping with intro electro distance of 2 mm was performed of the right atrium, Bachmann’s bundle, the left atrioventricular groove and the pulmonary vein area. Epicardial breakthrough waves were referred to as sinus node breakthrough waves if they were the earliest right atrial activated site. A total of 218 epicardial breakthrough waves and 57 sinus node breakthrough waves were observed in 168 patients or 44%.                                                 Epicardial breakthrough waves mostly occurred at the right atrium and 48% at the left atrioventricular groove and 31% followed by Bachmann’s bundle and 12% and the pulmonary vein area and 9%. Epicardial breakthrough waves occurred most often in ischemic heart disease patients 49% to valvular patient's 17%. Epicardial breakthrough wave electrograms most often consisted of double or fractionated electrograms seen in 63%. Fractionated epicardial breakthrough wave potentials were more often observed at the right atrium or Bachmann's bundle. The authors concluded that epicardial breakthrough waves are present in over a third of patients possibly indicating muscular connections between the endocardium and epicardium that may enhance the occurrence of epicardial breakthrough waves during atrial fibrillation promoting AF persistence.                                                 In the next article, Shouvik Haldar and associates compare horizontal and vertical orientation bipolar electrograms with novel omnipolar peak to peak voltages in sinus rhythm and atrial fibrillation using a high density fixed multi-electrode plaque placed on the epicardial surface of the left atrium in dogs. Bipolar orientation had significant impact on bipolar electrogram voltages obtained either in sinus rhythm or atrial fibrillation. Omnipole Vmax values were 99.9% larger than both horizontal or vertical electrograms in sinus rhythm in larger than horizontal or vertical electrograms in atrial fibrillation.                                                 Further vector analysis of omnipole electrograms showed that omnipolar electrograms can record electronic voltage unaffected by collision and fractionation. The authors concluded that omnipolar electrograms can attract maximal voltages from AF signals which are not influenced by directional factors, collision or fractionation compared to contemporary bipolar techniques.                                                 In our final article for the month, Pauline Quenin and associates examine the efficacy of screening in relatives of subjects who died suddenly. The authors provided clinical screening to 64 families who experienced unexplained sudden cardiac death before age 45 in a prospective multicenter registry. The diagnosis was established in 16 families, 25% including Brugada syndrome, long QT syndromes, dilated cardiomyopathy and hypertrophic cardiomyopathy. The diagnostic yield was mainly dependent on a number of screen relatives with 3.8 screen relatives in the diagnosed family versus 2.0 in the non-diagnosed families rising to 40% with at least three relatives.                                                 It additionally increased from 9% to 41% when both parents were screened. Diagnostic performance was also dependent on the exhaustiveness of the screening. 70% of complete screening versus 25% with incomplete screening with 17 Brugada syndrome and 15 long QT syndrome diagnoses based on pharmacologic tests. The authors concluded that even without autopsy, familial screening after sudden death in young patients is effective greatly increasing the likelihood of diagnosis in families.                                                 That's it for this month but keep listening. Suraj Kapa will be surveying all journals for the latest articles on topics of interest in our field. Remember to download the podcast On the Beat. Take it away Suraj. Suraj Kapa:                          Thank you Paul. It is my pleasure to welcome everybody back to our continued series of On the Beat articles from across the electrophysiology literature especially selected to highlight their potential importance in terms of either current or future practice within the realm of cardiac electrophysiology. Again, my name is Suraj Kapa and it is my pleasure to walk us through a variety of hard-hitting articles.                                                 Today we’ll be starting within the realm of atrial fibrillation specifically as it relates to cardiac mapping and ablation. The first article was by Iwasawa et al entitled Temperature Controlled Radiofrequency Ablation for Pulmonary Vein Isolation in Patients with Atrial Fibrillation published in volume 70 of the Journal of the American College of Cardiology. In this article, Iwasawa and colleagues discuss the role of novel temperature controlled irrigated ablation catheter to attempt to obtain deeper transmural lesions in cardiac tissue, specifically they tested the utility of a diamond embedded tip for rapid cooling accompanying six surface thermocouples to better reflect tissue temperature.                                                 They demonstrated in this first in human series that a temperature controlled irrigated ablation could produce rapid, efficient and durable PV isolation. The importance of this particular article lies in the continued development of novel tools that can achieve pulmonary vein isolation either more safely or more quickly. This was highlighted in the article by Iwasawa et al when they demonstrated that the mean radiofrequency application duration was significantly less by almost a factor of three and those using the novel radiofrequency ablation catheter versus those with older models.                                                 They also noted that there was lower acute dormant pulmonary vein re-conduction rates and patients tend to have more frequent durable isolation when remapped after ablation. While the study group only consisted of 35 patients within the treatment group and 35 patients within the control group, the potential of these novel catheters to achieve aims of both shortening procedure duration as well as improving procedure and success need to be taken in consideration.                                                 The next article is by Dr. Gopinathannair entitled Atrial Tachycardia after Surgical Atrial Fibrillation Ablation Clinical Characteristics, Electrophysiological Mechanisms and Ablation Outcomes from a large multicenter study published in the August 2017 issue of JACC Clinical Electrophysiology. In this article, Dr. Gopinathannair reviews the outcomes of cardiac mapping and ablation targeted atrial tachycardias occurring after surgical atrial fibrillation ablation. They reviewed a large number of patients nearly 137 undergoing catheter ablation for symptomatic postsurgical atrial fibrillation ablation atrial tachyarrhythmias across three high volume institutions in the United States.                                                 They demonstrated that the vast majority had a left atrial origin though up to a third also had a right atrial origin further atrial tachyarrhythmias. The predominant circuits noted were cavotricuspid isthmus but also frequently perimitral roof and left or right pulmonary veins. In addition, most of the patients namely 93% had at least one pulmonary vein reconnection requiring re-isolation. The key point with the article however were the outcomes. They demonstrated that acute termination inducibility could be achieved in as many as 97% of right atrial and 93% of left atrial tachyarrhythmias in the setting of prior surgical ablation.                                                 Furthermore, 12 month followup demonstrated an 80% success rate. Traditionally, surgical atrial fibrillation ablation is seen as a complex procedure with the remapping of arrhythmias requiring a lot more complexity. However, these findings cross a large group of patients suggesting that we can have a high rate of success should propose to individuals that perhaps targeted ablation at these postsurgical atrial tachyarrhythmias should be amenable towards ablation especially at high volume complex ablation centers.                                                 Next will discuss the article by Pathik et al entitled Epicardial-Endocardial Breakthroughs through Stable Macroreentry: Evidence from ultra-high-resolution three-dimensional mapping published in Heart Rhythm in August 2017. In this article, the group of Pathik et al decided to review whether epicardial-endocardial breakthrough could be discerned during stable right atrial macroreentry using high density and high spatial resolution three-dimensional mapping. Twenty-six patients were studied and they noted that up to 14 patients had evidence of epicardial-endocardial breakthrough. Using systematic entrainment confirmation, stable atrial macroreentry with epicardial-endocardial breakthrough was consistently demonstrated.                                                 The principle of epicardial-endocardial breakthrough or dissociation is critically important during cardiac mapping. While widely accepted for ventricular mapping, the tradition because of lack of available tools and atrial mapping has suggested that endocardial only mapping should reveal the entire cardiac circuits. Advances in signal processing as well as cardiac mapping techniques and technologies has allowed for better discernment of potentially deeper manifestations of cardiac tissue involvement in cardiac arrhythmias. As been well recognized that there can be significant epicardial and endocardial dissociation in cases of persistent atrial fibrillation.                                                 The article by Pathik et al is important in that it highlights that such events can manifest themselves even in the setting of relatively organized or stable atrial macroreentry. Part of the reason this becomes so critical is that when we consider endocardial only remapping and rely on these signals alone, we may run into situations where we miss a significant chamber of atrial tissue namely the epicardium, thus the focus of this article and the consideration of it in the clinician's repertoire of cardiac mapping and ablation should lie in an understanding of the fact that the entire story of an electrical circuits may not be told by traditional endocardial mapping alone without consideration for epicardial-endocardial breakthrough.                                                 The next article we will focus on is by Dr. Chun et al regarding the impact of cryoballoon versus radiofrequency ablation for paroxysmal atrial fibrillation on healthcare utilization and costs and economic analysis. This was from the FIRE and ICE Trial published in the Journal of the American Heart Association this past month. In this study they sought to assess payer cost following cryoballoon or radiofrequency catheter ablation for paroxysmal atrial fibrillation. They demonstrated that there are cost savings of as much as $355,000 related to the use of cryoballoon over traditional radiofrequency catheter ablation. This reduction in resource use and payer costs was consistent across three different national healthcare systems.                                                 Furthermore, the reason for the reduced cost was primarily attributable to fewer repeat ablations and a reduction in cardiovascular rehospitalizations with cryoballoon ablation. In this era of cost reduction, it is important to consider the potential implications of use of novel technologies in terms of procedural costs. The ability to identify novel techniques that can actually both reduce costs and either achieve equal or improved outcomes needs to be strongly considered. While the three national healthcare systems reviewed here might not reflect all healthcare systems or all insurance needs, it still brings up an important economic consideration that all novel technology may not necessarily result in increased costs, and utilization must be considered both in the context of the particular system as well as the particular provider.                                                 Changing pace, we’ll move on with an atrial fibrillation to the role of anticoagulation. The first major article recently published is by Pollack et al regarding the use of Idarucizumab for dabigatran Reversal, the full cohort analysis published the New England Journal of Medicine. Idarucizumab is a monoclonal antibody fragments developed to reverse the anticoagulant effect with dabigatran and represents the first reversal agent available for reversal of any of the novel oral anticoagulant drugs. In this study which is both multicenter, prospective and open label, patients were enrolled to undergo treatment with this reversal agents.                                                 A total 503 patients were included and the median maximum percentage reversal dabigatran was 100% which was measured using the diluted thrombin time or the ecarin clotting time. In those with active bleeding, the median time to cessation of bleeding was around 2.5 hours. Furthermore, in a surgical cohorts who underwent reversal in order to accommodate them going to surgery, the time to initiation of an intended procedures was 1.6 hours with periprocedural hemostasis assessed as normal in 93%, mildly abnormal in 5% and moderately abnormal in 1.5%. Thrombotic events occurred in about 6.3% of patients undergoing reversal because of active bleeding and then 7.4% undergoing reversal for surgical accommodation.                                                 Mortality rates were around 18% to 19%. Thus it was demonstrated that in emergency situations Idarucizumab can rapidly, durably and safely reverse the anticoagulant effect of dabigatran. However, it is important to note that there was a signal for thrombotic events and consideration of the risk of rapid reversal of anticoagulation regardless of the type of anticoagulation in combination with the actual need for reversal should be considered in the patient context.                                                 The next article we will review is by Jackevicius et al entitled Early Non-persistence with Dabigatran and Rivaroxaban in Patients with Atrial Fibrillation, published in Heart this past month. In this article, the group reviewed how patients manage being on their novel oral anticoagulants over the course of time after initial diagnosis and prescription. One of the concerns regarding novel oral anticoagulants is given the fact that there is no actual tracking or no actual measurements needed to ensure continued adherence to the drug, whether or not there will be higher rates of nonpersistence with use of these novel oral anticoagulants.                                                 Amongst 15,857 dabigatran users and 10,119 rivaroxaban users, they noted that at six months about a third of patients were nonpersistent with either drug. In those patients who were nonpersistent with use of the drug, the combined endpoint of stroke, TIA and death was significantly higher with hazard ratios of 1.76 in the dabigatran cohort and 1.89 in the rivaroxaban cohort. Furthermore, the risk of stroke or TIA was markedly higher in nonpersistent patients with about a hazard ratio of 3.75 in dabigatran nonpersistence and 6.25 in rivaroxaban nonpersistence.                                                 Given these relatively high rates of nonpersistence in clinical practice and the negative outcomes associated with nonpersistence, this highlights the importance of continued validation of the need for persistence with use of oral anticoagulation in patients prescribed these perceived to be at high risk of stroke associate with atrial fibrillation. In an era of improving drug use or improving drugs that can be used without the need for blood testing, it must also be considered that these drugs may be more easily stopped on the patient's own discretion without any knowledge from a provider as there is no active blood test associated. Thus this further highlights the importance of continued discussion between patients and physicians over the course of therapy and care regarding the need for continuation.                                                 Changing paces. We review the article by Godier et al entitled Predictors of Pre-procedural Concentrations of Direct Oral Anticoagulants a prospective multicenter study published at the European Heart Journal. We all know that one of the major issue with a direct oral anticoagulants is that these patients frequently undergo elective invasive procedures and in this setting the management can be very challenging specifically as it relates to when the direct oral anticoagulants should and can be safely stopped.                                                 In clinical practice, there is wide variability in the timing by which providers inform patients to stop these new oral anticoagulants prior to invasive procedure. In this prospective multicenter study, 422 patients were evaluated with preprocedural DOAC concentrations and routine hemostasis assays performed to determine those patients who achieved a minimal preprocedural concentration based on the timing of their discontinuation of the drug. They ranged the duration of discontinuation of the oral anticoagulant from 1 to 218 hours. They noted after a 49 to 72 hour discontinuation period, 95% of the concentration of the direct oral anticoagulants in patients had levels that were significantly low suggesting safety and proceeding with any sort of invasive procedure.                                                 Thus a 72 hour discontinuation period predicted sufficiently low concentrations of DOACs with 91% specificity. In multivariable analyses, duration of the DOAC discontinuation with creatinine clearances and antiarrhythmics were independent predictors of a minimal preprocedural DOAC concentration, namely better renal function, longer duration of DOAC discontinuation and interestingly the use of antiarrhythmic drugs were all associated with lower DOAC concentrations. The conclusion from this article was a last DOAC intake of three days before a procedure resulted in a minimal preprocedural anticoagulant effect for almost all patients considered.                                                 The exception would be in moderate renal impairment especially in dabigatran treated patients and antiarrhythmics in anti-Xa-treated patients could result in the need for longer DOAC interruption. Thus, the key things here to note are that antiarrhythmics can result in the need for longer DOAC interruption to achieve minimal blood concentrations and that similarly moderate renal impairment especially in dabigatran treated patients may result in the same. Another outcome other studies suggested a lack of association between routine assays such as routine hemostasis assays and DOAC concentrations suggesting that in situations where testing is believed to be needed routine assays should not replace DOAC concentration measurement in decision-making regarding whether or not the DOAC has sufficiently gone down in concentration to safely proceed.                                                 Along these lines, the final article we will review within the realm of anticoagulation is by Brendel et al entitled the Anticoagulant Effect of Heparin during Radiofrequency Ablation in Patients Taking Apixaban or Rivaroxaban published in the Journal of Interventional Cardiac Electrophysiology this past month. One concern regarding the use of the direct oral anticoagulants is the fact that during procedures where heparin is needed, knowledge of how much heparin to give is unclear. This is both in the setting of understanding what the synergistic effect of the simultaneous and continued use of apixaban or rivaroxaban or other direct oral anticoagulants in combination with heparin might be and also what the effect on actual activated coagulation time might be.                                                 As it is felt that be ACT may not necessarily reflect the true anticoagulant activity of drugs. Thus in a prospective study, Brendel et al studied about 90 patients with atrial fibrillation undergoing radiofrequency ablation procedures. During radiofrequency ablation, unfractionated heparin was given to maintain ACT of 250 to 300 ms with blood samples taken before and up 360 minutes after heparin administration. They demonstrated that heparin displayed a lower anti-Xa activity in rivaroxaban treated patients compared to apixaban treated patients.                                                 In contrast, D-dimer and prothrombin fragment F1+2 plasma levels indicated a higher activation of the coagulation cascade in apixaban/heparin combinations than in rivaroxaban/heparin combinations. While there was clear differences in the level of anticoagulant effect, depending on which DOAC was combined with heparin, they had no clinical impact in terms of bleeding or thromboembolic complications from the procedure. This article is significant in that it highlights that there are clear and different biochemical responses based on which DOAC is used in combination with heparin during radiofrequency ablation.                                                 While in the small study, there was no clear effect on clinical impact, precautions should still be considered when monitoring periprocedural hemostasis in DOAC patients to avoid mismanagement especially considering the variability that might occur between DOACs themselves and not just between DOACs and warfarin.                                                 Changing paces to risk stratification and management within atrial fibrillation. We’ll review the article by Labombarda et al entitled Increasing Prevalence of Atrial Fibrillation and Permanent Atrial Arrhythmias in Congenital Heart Disease published in this past month's issue of the Journal the American College of Cardiology. In this article, they sought to assess the types and patterns of atrial arrhythmias, associate factors and age-related trends in a multicenter cohort of patients with adult congenital heart disease. What they demonstrated is that by far the most common presenting arrhythmia was intraatrial reentrant tachycardia in almost two-thirds of patients with the remaining including atrial fibrillation in up to 30% of patients and focal atrial tachycardias in up to 10% of patients.                                                 The association of intraatrial reentrant tachycardia with congenital heart disease was stronger with higher complexities of congenital heart disease. With those with more complex defects having a higher frequency of IART than those with simple effects. Furthermore, as is commonly seen in the general population, the frequency of atrial fibrillation increased with age to eventually suppress IART as the most common arrhythmia in those greater than equal to 50 years of age. The predominant arrhythmia pattern was paroxysmal in almost two-thirds of patients though almost 30% were persistent.                                                 Furthermore, the frequency of permanent atrial arrhythmias increased with age. While it is commonly seen that patients with congenital heart disease were living longer and as a result it is expected that the frequency of arrhythmias in this population will likely increase. The interesting outcome from the study is the high frequency of intraatrial reentrant tachycardia as the presenting atrial arrhythmia in patients with congenital heart disease and also with the predominantly paroxysmal pattern. The finding also that atrial fibrillation increases in prevalence highlights the importance of closely monitoring these patients in order to assess for anticoagulation needs and options for treatment.                                                 Changing gears to cellular electrophysiology. We focus on an article by Qiao et al entitled transient Notch activation induces long-term gene expression changes leading to sick sinus syndrome in mice published in this past month's issue of Circulation Research. Notch signaling programs cardiac conduction during development and in the adult ventricle. It is noted that injury can induce notch reactivation resulting in global transcriptional and epigenetic changes. Thus, the group sought to determine whether notch reactivation may alter atrial ion channel gene expression arrhythmia inducibility.                                                 They demonstrated that notch signaling regulates transcription factor in ion channel gene expression in adult atrial myocardium. With reactivation inducing electrical changes resulting in sinus bradycardia, sinus pauses and a susceptibility atrial arrhythmias, altogether contributing to a phenotype resembling sick sinus syndrome. The importance of these findings lies in the mechanism underlying sick sinus syndrome.                                                 While we search for genetic clues for why patients might develop atrial fibrillation or sick sinus syndrome or sinus bradycardia as they age, the importance of activation of typically quiet signaling patterns in the adult myocardium and their role in arrhythmogenesis is important because it might highlight novel targets for treatment. Understanding how the arrhythmogenic substrate develops and the mechanisms underlying it, may allow for a better understanding of why in certain patients certain drugs may be effective or not or certain invasive therapies may be effective or not.                                                 Next with the realm of electrocardiography, we’ll review the article by Christophersen et al entitled 15 Genetic Loci Associated with Electrocardiographic P-wave published in Circulation Genetics this past month. Similar to the previous article by Dr. Qiao et al, the importance of the article by Christophersen et al lies in the identification of a number of genetic underpinnings for what forms the final electrocardiographic P-wave that is seen.                                                 Six novel genetic loci associated with P-wave duration and six novel loci associated with P-wave terminal force were identified by the group. Both in the case of the transient Notch activation findings as well as in the findings related to a specific genetic loci associated with electrocardiographic P-wave abnormalities might highlight potential genetic targets either with existing drugs not traditionally used for atrial electrophysiology or potentially future drug targets.                                                 Changing gears yet again, we’ll move on to their own sudden death cardiac arrest and specifically to an article published by Fallavollita et al entitled the denervated myocardium is preferentially associate with sudden cardiac arrest in ischemic cardiomyopathy a pilot competing risks analysis of cost specific mortality. Previous studies identify multiple factors associated with total cardiac mortality but we all recognize the ejection fraction has limited value. Thus within this article published in Circulation: Cardiovascular Imaging, the group decided to do a competing risks analysis the National Institutes of Health sponsored prediction of arrhythmic events with positron emission tomography trial.                                                 They demonstrated that sudden cardiac arrest was correlated with greater volumes of denervate myocardium based on defects on positron emission tomography using a norepinephrine analog carbon 11 hydroxy ephedrine. However, they also demonstrated that other factors such as lack of angiotensin inhibition therapy, elevated BNP and large left particular end-diastolic volume were further associated with sudden cardiac arrest.                                                 The importance of potential modifying factors to better attribute cardiac arrest risk and thus the need for defibrillator or other therapies in patients with myopathy needs to continue to be highlighted especially in light of recently published Danish and other studies suggesting that the mortality benefit conferred by ICD is an ischemic and nonischemic populations may not be equivalent in newer studies. The fact that further risk stratification opportunities can exist underlying the pathophysiologic basis for why these patients develop ventricular arrhythmias is critical. While recognized for a few decades now that myocardial denervation may be associated with sudden cardiac arrest risk, this study highlights the continued need for further study to help further clarify these populations.                                                 Moving onto the realm of genetic channelopathies, we review the article by Anderson et al entitled Lidocaine Attenuation Testing: An in vivo Investigation of Putative LQT3-Associated Variants in the SCN5A-encoded sodium channel published in this past month's issue of Heart Rhythm. Long QT syndrome type 3 represents one of the more difficult types of long QT syndrome to adequately diagnose both by genetic testing as well as through traditional means. Approximate 2% of healthy individuals can have rare variance of uncertain significance in the SCN5A channel and thus distinguishing true LQT3 causative mutations for background genetic noise can be quite difficult in this population.                                                 Anderson et al decided to assess the utility of lidocaine attenuation testing in evaluating patients with possible LQT3. They gave a loading dose of 1 mg per kg of intravenous lidocaine followed by continuous infusions of 50 micrograms for 20 minutes. If the corrected QT interval shortened by at least 30 ms, the LAT was defined as positive. They demonstrated that use of this test can help distinguish true LQT3 causative mutations from otherwise noncontributory variance of uncertain significance. Thus in this era of increasing genetic testing where one might identify a variant of uncertain significance in either a family member affected with sudden cardiac arrest or in a patient being evaluated for any sort of uncertain significant variant, the use of lidocaine testing in those variance as they apply to LQT type 3 may offer significant clinical use.                                                 Next we will review the article by Ishibashi et al published in this past month's edition of Heart entitled Arrhythmia Risk and Beta Blocker Therapy in Pregnant Woman with Long QT Syndrome. One of the biggest concerns of patients with long QT syndrome especially woman is pregnancy. The fact is because of the different hormonal states, it is possible that pregnancy may alter arrhythmic risk and the safety of beta blocker therapy given both the potential fetal effects as well as the continued efficacy at the level those seen previously.                                                 Thus Ishibashi et al reviewed 136 pregnancies across 76 long QT pregnant patients. They retrospectively analyzed clinical and electrophysiological characteristics in pregnancy outcomes in both the presence and absence of beta blocker therapy. All of the beta blocker group had prior events while the majority of the nonbeta blocker group had not been diagnosed with pregnancy. Pregnancy was noted to increase heart rate in those not treated with beta blockers, but interestingly, between the two groups there was no significant difference over the course of pregnancy in QT intervals.                                                 In the beta blocker group, only two events occurred and these were relegated to the postpartum period. However, 12 events occurred in the nonbeta blocker group either during pregnancy and half or in the postpartum period and the remaining half. There was no difference in this frequency of spontaneous abortion between the two groups, and furthermore, fetal growth rates and proportion of infants with congenital malformation were similar between the two groups. However, premature delivery and low birth weight infants were more common in those taking beta blockers.                                                 Given the high risk of events and the relative safety of beta blocker therapy in this population of patients with long QT who become pregnant, it was felt that the use of early diagnosis and beta blocker therapy could be critical both the during pregnancy and during the postpartum period. It was also felt the beta blocker therapy may be tolerated for babies in long QT pregnant patients. This highlights that the continued use of beta blockers throughout the pregnancy and consideration of the introduction of beta blockers in those not already on them during pregnancy may be an important consideration.                                                 Finally within the realm of genetic channelopathies, we focus on the article by Roberts et al entitled Loss of Function in KCNE2 Variants: True Monogenic Culprits of Long QT Syndrome or Proarrhythmic Variants Requiring Secondary Provocation published in this past month's issue of Circulation: Arrhythmia Electrophysiology. As we identify more and more genes the baby is associated with long QT syndrome, the understanding of the clinical phenotype associated with that syndrome requires better study. In this particular study, Roberts et al reviewed the role of long QT syndrome type 6 stemming from mutations in the KCNE2 encoded voltage gated channel beta subunits.                                                 They reviewed mutations identified during arrhythmia evaluation from either inherited arrhythmia clinics or the Rochester long QT syndrome registry. They demonstrated that the high allelic frequencies of LQT6 mutations in the Exome aggregation consortium database and the absence of previous documentation of genotype phenotype segregation suggest many KCNE2 variants and potentially all were actually erroneously designated as LQT as causative mutations. Instead, it was felt the KCNE2 variants may actually confer proarrhythmic susceptibility when provoked by additional environmental and/or acquired or genetic factors.                                                 What they are saying is that identifying the KCNE2 variants as the principal culprits may be over calling the role of the KCNE2 variants and instead it might be a combination of effects such as two hit affect the requires further provocation by either outside or additional genetic factors. Furthermore, complex genetic studies were likely needed to better understand how variants and genes that may not have been previously designated as disease causing play a role in the actual disease process, whether as potentiating other factors that might exist that might also otherwise be relatively benign or as unique singular hits that might by themselves result in the clinical phenotype.                                                 Next moving onto the realm of ventricular arrhythmias, we first focus on an article published in this past month's issue of the American Journal of Physiology, Heart and Circulatory Physiology by Howard Quijano et al entitled Spinal Cord Stimulation Reduces Ventricular Arrhythmias during Acute Ischemia by Attenuation of Regional Myocardial Excitability. In this article, they demonstrated in a porcine model ventricular ischemia that spinal cord stimulation decrease sympathetic nerve activation regionally in ischemic myocardium while having no effect on normal myocardium. They demonstrated that the antiarrhythmic effects conferred by spinal cord stimulation were likely secondary to attenuation of some sympathoexcitation locally in ischemic myocardium rather than changes in the global myocardial electrophysiology.                                                 This is important because it highlights the mechanisms by which spinal cord stimulation may confer in antiarrhythmic benefits in both animal and human models. As we search for novel interventions that can be used for the treatment of ventricular arrhythmias, understanding the underlying pathophysiologic mechanisms by which they work is critical. The understanding that the use of spinal cord stimulation is primarily conferred in a regional way primarily in terms of its effect on an ischemic myocardium, further study is also needed in terms of how the effect is seen in nonischemic myopathies where there may be more patchy scar in the same role of denervation, nerve sprouting and hyper innervation may play different roles.                                                 In the next article we choose to focus on is by Berte et al entitled a New Cryo-energy for Ventricular Tachycardia Ablation a Proof of Concept Study published in this past month's edition of Europace. One of the key problems in ventricular tachycardia ablation is the lack of transmural lesion formation. This is an important determinant of arrhythmia recurrence. Thus the group decided to do a proof of concept study to evaluate the safety and efficacy of a new and more powerful cryoablation system for ventricular ablation. They demonstrated that a novel cryoablation system to create large transmural ventricular lesions, whether it delivered by endocardial or epicardial approach. It was felt that this technology can hold potential for both surgical and catheter-based VT ablation in humans.                                                 While primarily studied in sheep models, it nevertheless highlights the importance of novel therapies that might better achieve through and through lesions. There are many different novel products being developed for the hope of achieving transmural lesions partly to target the myocardial circuits and partly to ensure achievement of through and through lesions without leaving residual potential substrate, because of only partial thickness lesions. These include things like needle ablation catheters, the safety of which still has to be fully evaluated, bipolar ablation or the use of technology such as novel cryo-energy approaches. Comparative efficacy of these different approaches however will be critical to determining which one is safest and best in any given clinical situation.                                                 Next we’ll review the article by Venlet et al published this past month's issue of Circulation Arrhythmia and Electrophysiology entitled Unipolar Endocardial Voltage Mapping in the Right Ventricle: Optimal Cutoff Values Correcting for Computed Tomography-derived Epicardial Fat Thickness and their clinical value for substrate delineation. The work by [inaudible 00:53:37] and others highlighted the importance of using unipolar and bipolar voltage cutoffs and helping delineate areas of both endocardial as well as potentially more distal such as epicardial scar during endocardial mapping. It is felt the low endocardial unipolar voltage during bipolar voltage mapping endocardially may indicate epicardial scar.                                                 However, the primary issues, the additional presence of epicardial fat both in the right ventricle and left ventricle and how this epicardial fat may effect normal unipolar voltage cutoffs. Thus, Venlet et al decided to review using computed tomography data the effective epicardial fat on unipolar voltage cutoffs. They demonstrated that endocardial unipolar voltage cutoff of 3.9 millivolts was more accurate than previously reported cutoff values for right ventricular epicardial scar during endocardial mapping.                                                 It was further demonstrated that while epicardial abnormal electrograms may be associated with transmural scar when associated with low endocardial bipolar voltage, the additional use of endocardial unipolar voltage and normal bipolar voltage sites can improve the diagnostic accuracy resulting in identification of all epicardial abnormal electrograms at sites with less than 1 mm of fat. Thus, the unipolar voltage not only assisted in evaluating whether epicardial scar was present, but also in further clarifying epicardial abnormal electrograms in terms of whether or not they truly represented potential transmural scar.                                                 Finally, within the realm of electrogram mapping of ventricular arrhythmias, we focus on the article by Magtibay et al entitled Physiological Assessment of Ventricular Myocardial Voltage using Omnipolar Electrograms published in the Journal of the American Heart Association this past month. Bipolar electrograms are traditionally used to characterize myocardial health. However, dependence on these electrograms may reduce the reliability of voltage assessment along different planes of arrhythmic myocardial substrates.                                                 Thus, newer catheters rely on evolving tools that might allow for different approaches to bipolar mapping. Using omnipolar electrograms, Magtibay et al studied in healthy rabbits, pigs and diseased humans under paced conditions the role of two bipolar electrode orientations both horizontal and vertical. Voltage maps were created for both bipoles and omnipoles, and they noted that electric orientation affected the bipolar voltage map with an average absolute difference between horizontal and vertical of up to 0.25 millivolts in humans. Thus, they demonstrated omnipoles can provide physiologically relevant and consistent voltages along the maximal bipolar direction and provide an advantage over traditionally obtained bipolar electrograms.                                                 When we consider the use of evolving techniques to get an understanding of myocardial health whether for the purpose of cardiac mapping and ablation or even for the purpose of other intervention such as cardiac biopsy, understanding what the voltage abnormalities perceived actually are is critical to understanding what substrate is actually being targeted. However, given directionality issues in terms of assessment of voltage as well as relative orientation of the catheter in understanding the relevance of received voltage, use of novel signal processing and electro designs are important to consider in the light of their effects on substrate mapping compared to traditional techniques.                                                 Changing gears yet again, but nevertheless related to cardiac mapping and ventricular arrhythmias, we focus on article by Yalagudri et al published in this past month's issue of the Journal of Cardiovascular Electrophysiology entitled A Tailored Approach for Management of Ventricular Tachycardia in Cardiac Sarcoidosis. While in a small number of patients, nearly 14 patients, they attempt to develop a methodology for approaching patients with cardiac sarcoidosis for management of their ventricular arrhythmias. Patients with either cardiac myocarditis or cardiac sarcoidosis represent a particularly difficult cohort to treat.                                                 Prior work by Dr. Roderick Tung and others has demonstrated the high-frequency of perceived inflammatory abnormalities based on cardiac FDG PET scanning amongst patients with ventricular arrhythmias. Whether this reflects cardiac sarcoidosis or other hypermetabolic activity is unclear. However, how to take into account the FDG PET abnormalities when deciding whether or not to take a patient for ablation or how to best treat them in light of their primary disease process is critical.                                                 In this study, the group tried to tailor therapy for ventricular tachycardia and cardiac sarcoidosis according to the phase of disease results. Namely based on the degree of inflammation noted on the FDG PET scan. They noted that via their named clinical protocol, that this tailored therapy could result in good clinical outcome and avoid unnecessary immunosuppression in some patients. Whether or not the use of this tailored therapy approach may apply in larger populations remains to be seen.                                                 Finally within the realm of other EP concepts that might apply broadly across the electrophysiology landscape, we focus on two articles. The first is by Kudryashova et al entitled Virtual Cardiac Monolayers for Electrical Wave Propagation in Nature Scientific Reports this past month. It is the complex structure of cardiac tissue that is considered to be one the main determinants of whether a substrate becomes arrhythmogenic or not. Multiple mathematical and computational models have been developed in order to recapitulate this complex cardiac structure. However, there been varying degrees of limitations in these approaches.                                                 Using a joint in silico-in vitro approach, the group carefully characterized the morphology of cardiac tissue and cultures of neonatal rat ventricular cells and then proposed mathematical models to result in tissue morphology that could be recapitulated for virtual studies of cardiac electrophysiology mainly in order to study wave propagation. They demonstrated in their virtual cardiac monolayers, that the simulated waves had the same anisotropy ratios and wave form complexity as those in in vitro experimental models.                                                 Thus, they demonstrated that they could reproduce both the morphological and physiological properties of cardiac tissue in a virtual landscape. These findings are critical to improving the ability to better study the effects of different antiarrhythmic drugs or interventional techniques on overall cardiac electrophysiology. The difficulty in existing techniques using traditional in vitro cultures is the fact that they’re costly and requires sacrifice of animals that adds to the additional cost of routine studies. The ability to recapitulate actual hearts within a virtual landscape to mimic the cardiac electrophysiology and then study it in a more controlled setting that can be reproducible based on the availability of appropriate computing power is important in terms of future studies within the realm of our field.                                                 The final article we will review is by Das and Dutta published in Physical Review E this past month entitled Controlling Three-Dimensional Vortices using Multiple and Moving External Fields. One of the key studies over the course of the last several years has been that of the role of the spiral and scroll waves in not just atrial fibrillation but ventricular fibrillation and other arrhythmias. It is well recognized that the spiral or scroll waves depending on whether one thinks in a two dimensional or three dimensional substrate may have significant contribution to arrhythmogenesis. Whether targeting the spiral or scroll waves actually eliminates arrhythmias remains to be fully elucidated. However, it also remains to be elucidated exactly how one should control the spiral or scroll waves.                                                 The review by Das and Dutta demonstrated that in fact the spiral or scroll waves could actually be physically moved around and controlled using moving external electric fields and thermal gradients. They show that the scroll rings can be made to trace cyclic trajectories on a rotating electric field or that application of thermal gradients in addition to electric field could deflect the motion and change the nature of a trajectory of a spiral or scroll wave. These findings are important in that they might represent non-ablative techniques that can eventually be used to control spiral or scroll waves in cardiac media, and thus result in either their alteration or termination without the need for additional cardiac injury.                                                 One the biggest problems with additional cardiac ablation in cases such as atrial fibrillation is the fact that they often lead to additional regions of scarring that might lead towards further organized atrial arrhythmias. However, the ability to potentially terminate critical sites responsible for arrhythmogenesis in real time without the need for ablation may represent novel interventions or devices in the future.                                                 I appreciate everyone's attention to these key and hard-hitting articles that we have just focus on from this past month of cardiac electrophysiology across the literature. Thanks for listening. Now back to Paul. Dr. Paul Wang :                 Thanks Suraj. You did a terrific job surveying all journals for the latest articles on topics of interest in our field. There is not an easier way to stay in touch with the latest advances. These summaries and a list of all major articles in our field each month could be downloaded from the Circulation: Arrhythmia and Electrophysiology website. We hope that you’ll find the journal to be the go to place for everyone interested in the field. See you next month.

Back in 2009, University of Washington professor, Jay Shendure, wrote a definitive paper offering up a roadmap for exome sequencing. Since then, the cost of sequencing has come down so far that many have debated whether or not to do whole genome sequencing vs. just the exome.  

Avni Santani of CHOP speaks to CHI on Tuesday August 1st, 2018. Dr. Santani will be speaking during the Clinical NGS Assays: Applications and Interpretation meeting at the Next Generation Diangostics SummitAugust 15-18, in Washington DC. Topics include using a CHOP strategies for integrating NGS into clinical care, what challenges they have run into and new applications of NGS For more information, please visit http://www.NextGenerationDx.com/ngs-diagnostics

Dr Cohen presents analysis at the San Antonio Breast Cancer Symposium 2016 of primary and metastatic breast cancer biopsies, with samples matched where available, which underwent whole exome sequencing and transcriptome sequencing to give a clearer view of tumour evolution. He highlights notable acquired mutations in ER positive MBC, which may inform treatment choice for patients and target choice for future research.

June 2017 See acast.com/privacy for privacy and opt-out information.

Dick McCombie

Dick McCombie

Podcast brought to you by: Slone Partners - Providing the leaders that shape the clinical trials space. About six years ago there was a wave of genome interpretation startups getting their first rounds of funding. One of them was Personalis, a company founded by a well known group of Stanford geneticists and bioinformaticians.

Drs. Ben Solomon, Leora Horn, & Jack West evaluate the merits of broad genetic testing with a "next generation sequencing" platform compared to selective, limited testing for the most proven driver mutations in patients with advanced NSCLC.

Drs. Ben Solomon, Leora Horn, & Jack West evaluate the merits of broad genetic testing with a "next generation sequencing" platform compared to selective, limited testing for the most proven driver mutations in patients with advanced NSCLC.

Drs. Ben Solomon, Leora Horn, & Jack West evaluate the merits of broad genetic testing with a "next generation sequencing" platform compared to selective, limited testing for the most proven driver mutations in patients with advanced NSCLC.

In the last year, multiple clinical studies have shown the diagnosti c power of testing a patient's exome. Clinical exome testing is now available at over a dozen clinical laboratories in the US , and has been performed for thousands of patients.

Editor's Audio Summary by Howard Bauchner, MD, Editor in Chief of JAMA, the Journal of the American Medical Association, for the November 12, 2014 issue

Exome sequencing discussion by Michael Shy, MD and Stephan Zuchner, MD, and interviewed by Ted Burns, MD

Exome sequencing discussion by Michael Shy, MD and Stephan Zuchner, MD, and interviewed by Ted Burns, MD

Exome sequencing discussion by Michael Shy, MD and Stephan Zuchner, MD, and interviewed by Ted Burns, MD

Pediatric Grand Rounds with John Graham Jr., MD, ScD Cedars-Sinai

Kip Harry interviews Gholson Lyon of the Cold Spring Harbor Laboratory on September 13, 2013. Dr. Lyon will be speaking during the Clinical Exome Sequencing conference at the Clinical Genomics & Informatics Europe Conference & Expo on December 4-6, in Lisbon, Portugal. Topics include: • Biology and Targeting of Cancer through Exome Sequencing • Technical Steps for Exome Sequencing • Analyzing Exome Data • Implementing Exome Sequencing in a Clinical Lab • Comparing and Contrasting Exome vs. Whole Genome Sequencing • Exome Sequencing Survey of Cancers • Standardizing Library Prep and Intra-Patient Genomic Heterogeneity • Exome Sequencing for Candidate Gene Discovery with Clinical Samples

Stephen Euin Cobb is today's featured speaker. Topics: Erotic novels are getting a sales boost from ebooks such as the Kindle and the Nook; Google's anticipated eyeglass computers; many (and possibly most) human beings are chimeras; the next big boom-time for programmers who write apps; how science fiction's vision of the future changes based on the decade in which it is written; sequencing each patient's personal exome; and the steadily falling price of sequencing a patient's personal genome. I also mention interviewing Ari Kiirikki (then Vice President of Knome Inc. The world's leading provider of personal DNA sequencing) several years ago at the Singularity Summit in New York City. Mini Speculative Essay: The news article I read into this episode about Human Chimeras specifies that expectant mothers get a dose of stem cells from their fetus, and that these stem cells travel through the mother's body and become a permanent part of her various tissues, including the brain. It just struck me that this may be part of why women have a statistically longer lifespan than men, who of course never get this or any bonus dose of fresh cells during their adulthood. The obvious test of this as a correlation would be to compare the longevity of a population of women who had no pregnancies, verses those who had many pregnancies. It should also be mentioned that births in this case may not be relevant. Pregnancy alone, even if only temporary, may be sufficient to dose a woman with fresh stem cells. It should also be mentioned that, the amount of stem cells received by the mother may be trivial to her longevity, that this amount my vary widely from mother to mother, or even from pregnancy to pregnancy for the same mother. There are many possible interesting variables to explore. Some of them may be meaningful. Maybe. This is just a speculative idea. Right now I have no strong opinion on it either way. An opinion would be impossible without data. Hosted by Stephen Euin Cobb, this is the May 23, 2012 episode of The Future And You. [Running time: 42 minutes] Stephen Euin Cobb is an author, futurist, magazine writer and host of the award-winning podcast The Future And You. A contributing editor for Space and Time Magazine; he is also a regular contributor for Robot, H+, Grim Couture andPort Iris magazines; and he spent three years as a columnist and contributing editor for Jim Baen's Universe Magazine. He is an artist, essayist, game designer, transhumanist, and is on the Advisory Board of The Lifeboat Foundation. His novels include Bones Burnt Black, Plague at Redhook and Skinbrain.

Next generation sequencing has become the core technology for gene discovery in rare inherited disorders. However, the interpretation of the numerous sequence variants identified remains challenging. We assessed the application of exome sequencing for diagnostics in complex I deficiency, a disease with vast genetic heterogeneity.