JIMD Podcasts

Lucas Agnoletto and Dr Rebecca Halligan report work looking at sleep quality in children with hepatic GSDs, considering whether sleep is impacted by poor glycemic control or our efforts to improve this through overnight feeding. Sleep quality in children with hepatic glycogen storage diseases, a prospective observational pilot study Lucas Agnoletto, et al https://doi.org/10.1002/jmd2.12462

Michel Tchan and Mirjam Langeveld join the podcast to look at changes to adult IMD services over the last decade and consider the challenge to develop services to meet the needs of growing patient numbers over the next 10 years. The Frequencies of Different Inborn Errors of Metabolism in Adult Metabolic Centres: 10 Years Later, Another Report From the SSIEM Adult Metabolic Physicians Group Michel Tchan, et al https://doi.org/10.1002/jimd.70005

Dr Sabine Fuchs, Professor of Metabolic diseases and innovative therapies at the UMC Utrecht, and Dr Sean Froese, a Principal Investigator in the Metabolism Division at University Children's Hospital Zürich, join Rodrigo and Silvia to discuss new insights and some of their favourite papers on Methylmalonic Aciduria. Authors opinions are their own and do not represent their institutions. Papers discussed include: Integrated multi-omics reveals anaplerotic rewiring in methylmalonyl-CoA mutase deficiency Forny et al Aberrant methylmalonylation underlies methylmalonic acidemia and is attenuated by an engineered sirtuin. Head et al Lipodystrophy in methylmalonic acidemia associated with elevated FGF21 and abnormal methylmalonylation. Manoli et al Prime editing for functional repair in patient-derived disease models Schene et al Mutation-specific reporter for optimization and enrichment of prime editing Schene et al Biomarkers to predict disease progression and therapeutic response in isolated methylmalonic acidemia. Manoli et al Fibroblast growth factor 21 as a biomarker for long-term complications in organic acidemias. Molema et al

Dr Carole Linster and Dr Nicole van Bergen explain why metabolism isn't perfect and how disorders of enzyme repair present their own challenges. In an episode that explores Niacin and longevity, we also hear why NAXD deficiency is an important differential in acute cardiomyopathy and provides an aetiology that could be highly amenable to treatment. Clinical and biochemical distinctions for a metabolite repair disorder caused by NAXD or NAXE deficiency Nicole J. Van Bergen, et al https://doi.org/10.1002/jimd.12541 NAD(P)HX dehydratase (NAXD) deficiency: a novel neurodegenerative disorder exacerbated by febrile illnesses Nicole J Van Bergen, et al https://doi.org/10.1093/brain/awy310 Severe NAD(P)HX Dehydratase (NAXD) Neurometabolic Syndrome May Present in Adulthood after Mild Head Trauma Nicole J Van Bergen, et al https://doi.org/10.3390/ijms24043582

Asthik Biswas, Spyros Batzios, and Kshitij Mankad expand on their recent letter to the editor to explain why ushering in the new era of gene therapy treatments requires not just clinical but also imaging readiness. Imaging readiness in the gene therapy era-exploring standardized protocols for response assessment Asthik Biswas, et al https://doi.org/10.1002/jimd.12828

Dr Matthew Wilson, Postdoctoral Fellow at the Centre for Human Genetics, KU Leuven, joins hosts Silvia Radenkovic and Rodrigo Starosta to discuss a scintillating selection of CDG papers in our first ever research round-up. The papers discussed include: A pseudoautosomal glycosylation disorder prompts the revision of dolichol biosynthesis. Wilson et al Clinical and biochemical footprints of congenital disorders of glycosylation: Proposed nosology. Ng et al Rft1 catalyzes lipid-linked oligosaccharide translocation across the ER membrane. Chen et al Molecular characterization of Rft1, an ER membrane protein associated with congenital disorder of glycosylation RFT1-CDG. Hirata et al Genome and RNA sequencing were essential to reveal cryptic intronic variants associated to defective ATP6AP1 mRNA processing. Morales-Romero et al N-glycoproteomic and proteomic alterations in SRD5A3-deficient fibroblasts. Garapati et al In vitro treatment with liposome-encapsulated Mannose-1-phosphate restores N-glycosylation in PMM2-CDG patient-derived fibroblasts. Shirakura et al Liposome-encapsulated mannose-1-phosphate therapy improves global N-glycosylation in different congenital disorders of glycosylation. Budhraja et al D-mannose as a new therapy for fucokinase deficiency-related congenital disorder of glycosylation (FCSK-CDG). Starosta et al Glycoproteomics in Cerebrospinal Fluid Reveals Brain-Specific Glycosylation Changes. Baerenfaenger et al Neural and metabolic dysregulation in PMM2-deficient human in vitro neural models. Radenkovic et al

It's an Arg1 extravaganza as Reena Sharma, Sara Olofsson, Karolina Stepien and Alison Woodall discuss three separate papers looking at the Salford Royal experience of a cohort of adults with Arginase 1 deficiency and the wider health and societal burden of the condition. Retrospective analysis of arginase 1 deficiency progression in adults over 5 years at a single metabolic centre Reena Sharma et al https://doi.org/10.1002/jmd2.12450 Disease burden among patients with Arginase 1 deficiency and their caregivers: A multinational, cross-sectional survey Sara Olofsson et al https://doi.org/10.1002/jmd2.12456 Societal costs and quality of life associated with arginase 1 deficiency in a European setting – a multinational, cross-sectional survey Sara Olofsson et al https://doi.org/10.1080/13696998.2024.2400856

In this Shortcast, Dr Aya Amer presents the New Zealand experience of using ketone (D,L-3-HB) supplementation in 12 patients (aged 10-50 years) with GLUT1DS. D,L-3-hydroxybutyrate in the treatment of glucose transporter 1 deficiency syndrome (Glut1DS) Aya Amer, et al https://doi.org/10.1002/jmd2.12461

Marshall Summar explains why common polymorphisms and basic physiology mean that L-citrulline may have a role in sickle cell disease, bronchopulmonary dysplasia and even asthma. Potential therapeutic uses of L-citrulline beyond genetic urea cycle disorders Marshall Summar https://doi.org/10.1002/jimd.12810

In this Metabolic Mystery, Dr Eamon McCarron unravels an unexpected diagnosis in a 55-year-man with a 2-year history of dragging his legs, poor balance, and paresthesia along the outer aspect of his right thigh. He underwent various assessments and investigations over the next 3 years before a diagnosis was made. https://onlinelibrary.wiley.com/doi/full/10.1002/ajmg.a.64031#

Dr Jessica Gold discusses observations around executive function in early treated MSUD patients and how this impacts on outcomes around transition to adulthood. Executive and adaptive function impacts long-term outcomes for adults with maple syrup urine disease Jessica I. Gold, et al https://doi.org/10.1002/jimd.12827

Dr Ashlee Stiles discusses the work-up of a 13-month-old girl with hypoglycaemia and discusses the need to balance prompt metabolic work-up with managing the acutely unwell patient in front of you. Critical sample collection is key and don't forget the urine. Read the report here: https://www.sciencedirect.com/science/article/pii/S2214426924000156?via%3Dihub

Dr Thomas Cassini explains how the Undiagnosed Diseases Network group used advanced sequencing techniques to clarify the genotype in a child with an unusual phenotype for mitochondrial trifunctional protein deficiency. Mitochondrial trifunctional protein deficiency caused by a deep intronic deletion leading to aberrant splicing Thomas Cassini, et al https://doi.org/10.1002/jmd2.12459

Eva Hoytema van Konijnenburg and Clara van Karnebeek tell the podcast about the treatabolome an epic project to include all current IMD treatments and add them to the IEMbase. The Metabolic Treatabolome and Inborn Errors of Metabolism Knowledgebase therapy tool: Do not miss the opportunity to treat! Bibiche den Hollander, et al https://doi.org/10.1002/jimd.12835

Cystathionine β-Synthase Deficiency in the E-HOD Registry—Part II: Dietary and Pharmacological Treatment Andrew A. M. Morris, Jitka Sokolová, Markéta Pavlíková, Florian Gleich, Stefan Kölker, Carlo Dionisi-Vici, Matthias R. Baumgartner, Luciana Hannibal, Henk J. Blom, Martina Huemer, Viktor Kožich, E-HOD Consortium https://doi.org/10.1002/jimd.12844

Nathalie Guffon joins the podcast to discuss alpha-mannosidosis and the long term efficacy of enzyme replacement therapy with velmanse alfa. Extended long-term efficacy and safety of velmanase alfa treatment up to 12 years in patients with alpha-mannosidosis Nathalie Guffon, et al https://doi.org/10.1002/jimd.12799

It seems everyone is talking about autophagy but what is it and what happens when it goes wrong? Hormos Salimi Dafsari, Carlo Dionisi-Vici, and Heinz Jungbluth join the podcast to answer these questions, discuss their experience across 3 (or 2.5) generations of clinical practice and why you never see an obese 100-year-old. An update on autophagy disorders Hormos Salimi Dafsari, et al https://doi.org/10.1002/jimd.12798

Marie-Thérèse Henke, Alessandro Prigione, and Markus Schuelke get 2025 off to an informative start discussing why so many models exist for Leigh Syndrome, why we need them and how insights from disease models have led to Sildenafil being used in some patients. Disease models of Leigh syndrome: From yeast to organoids Marie-Thérèse Henke, Alessandro Prigione, Markus Schuelke https://doi.org/10.1002/jimd.12804

Dr François Feillet returns to the podcast to discuss the final results of the KAMPER study, evaluating the long-term safety of sapropterin in phenylketonuria (phenylalanine hydroxylase deficiency). Long-term safety of sapropterin in paediatric and adult individuals with phenylalanine hydroxylase deficiency: Final results of the Kuvan® Adult Maternal Paediatric European Registry multinational observational study François Feillet, et al https://doi.org/10.1002/jimd.12796

Dr Sema Kalkan Uçar joins the podcast to discuss the merits of a high protein, high fat diet for the management of patients with Glycogen Storage Disease type 3a. Long-term personalized high-protein, high-fat diet in pediatric patients with glycogen storage disease type IIIa: Evaluation of myopathy, metabolic control, physical activity, growth, and dietary compliance Sema Kalkan Uçar, et al https://doi.org/10.1002/jimd.12741

Dr Gabriella Horvath returns for her second visit to the podcast, joining Eva Morava to discuss psychiatric presentations of Inherited Metabolic Disease. Read the referenced paper here: https://doi.org/10.1016/j.ymgme.2020.02.007 Find IMDs associated with psychiatric presentations at: http://iembase.org/gamuts/store/docs/Psychiatric_IMD_gamuts.pdf

In this Shortcast Antonio Ochoa-Ferraro and Dr Charlotte Dawson share their experience using the medication Volanesorsen with two pregnant women diagnosed with familial chylomicronemia syndrome. Two successful pregnancies in patients taking Volanesorsen for familial chylomicronemia syndrome Subadra Wanninayake, et al https://doi.org/10.1002/jmd2.12435

In the latest podcast, Dr Lourdes Desviat provides an overview of the different RNA based therapeutic approaches including how they work and which are showing promise for the management of Urea Cycle Disorders. Exploring RNA therapeutics for urea cycle disorders Eva Richard, Ainhoa Martínez-Pizarro, Lourdes R. Desviat https://doi.org/10.1002/jimd.12807

Dr Hannerieke van den Hout of Erasmus MC joins the podcast to discuss observations from two decades of early treated infantile onset Pompe disease and the evolving nature of the neurological phenotype. Long term survival in patients with classic infantile Pompe disease reveals a spectrum with progressive brain abnormalities and changes in cognitive functioning van den Dorpel, et al https://doi.org/10.1002/jimd.12736

Callie Ferguson discusses her group's care for a young woman with FBPase deficiency during pregnancy and beyond. Metabolic management of a successful pregnancy and postpartum complications in fructose-1,6-bisphosphatase deficiency Callie Ferguson, Anita Madison, Ada Hamosh, Celide Koerner https://doi.org/10.1002/jmd2.12453

Professor Shamima Rahman and Dr Nandaki Keshavan take us on a whistle stop tour of the different approaches taken to gene therapy in mitochondrial disease and why some may work better than others. Gene therapy for mitochondrial disorders Nandaki Keshavan, Michal Minczuk, Carlo Viscomi, Shamima Rahman https://doi.org/10.1002/jimd.12699

Olivia Garrett, Jared Druss, Estela Rubio-Gozalbo, Gerard Berry, and Judith Fridovich-Keil discuss outcomes in classic galactosemia drawn from patient surveys of 97 adults. Health and well-being of maturing adults with classic galactosemia Olivia S. Garrett, Jared J. Druss, E. Naomi Vos, Yu-Ting Debbie Fu, Stephanie Lucia, Patricia E. Greenstein, Anna Bauer, Jolanta Sykut-Cegielska, Karolina M. Stepien, Cameron Arbuckle, Olga Grafakou, Uta Meyer, Nele Vanhoutvin, Adriana Pané, Annet M. Bosch, Estela Rubio-Gozalbo, Gerard T. Berry, Judith L. Fridovich-Keil https://doi.org/10.1002/jimd.12786

Professor Carlos Ferreira joins Eva Morava to discuss the metabolic cardiovascular disease and explain why cardiac involvement is common in IMDs and when an underlying metabolic should be suspected in a cardiac presentation. Read the referenced paper here: https://doi.org/10.1016/j.ymgme.2020.12.290 Find IMDs associated with epilepsies at: http://www.iembase.org/gamuts/store/docs/GAMUTS_Supplemental_table%202_footprints_4_181220.pdf

Originally presented at the SSIEM 2023 Annual Symposium, Dr Ozlem Goker-Alpan discusses neuronopathic gaucher disease, regional variations and hopes for new treatments. Neuronopathic Gaucher disease: Rare in the West, common in the East Ozlem Goker-Alpan, Margarita M. Ivanova https://doi.org/10.1002/jimd.12749

Dr Melanie Gillingham, PhD, RD, joins the podcast to discuss eye disease in LCHADD and changes in outcomes following early or late diagnosis. Early diagnosis and treatment by newborn screening (NBS) or family history is associated with improved visual outcomes for long-chain 3-hydroxyacylCoA dehydrogenase deficiency (LCHADD) chorioretinopathy Melanie B. Gillingham, et al https://doi.org/10.1002/jimd.12738

Professor Corrado Angelini joins Eva Morava to discuss the footprints of metabolic myopathies, why they are so common and when they should be suspected. Read the referenced paper here: https://doi.org/10.1016/j.ymgme.2022.09.004 Find IMDs associated with epilepsies at: http://www.iembase.org/gamuts/store/docs/Footprints_myopathies_table%20151022.pdf

Concluding our limited series related to the SSIEM 2024 meeting in Porto. We reflect on Day 3 and modelling disease through organoids, nursing in IMD investigation of hypoglycaemia. We also hear more about dolichol metabolism and George Komrower.

Thoughts on the second day of SSIEM 2024 annual symposium and a little preview of day 3.

A look back on the first day of the SSIEM 2024 Annual Symposium and a preview of Day 2 with Rodrigo Starosta co-hosting.

The first of a series of podcasts accompanying the 2024 annual symposium of the SSIEM 2024. In this episode Dr Dulce Quelhas reflects on her plans for the meeting and just how long it has been gestating. Stay tuned for daily content.

Professor Judy Fridovich-Keil returns to the podcast to explain her work to illustrate whether the phenotype of galactosemia is related to GALT activity or galactose metabolism. Her group have been working with plant enzymes in fruit flies. Restoring galactose metabolism without restoring GALT rescues both compromised survival in larvae and an adult climbing deficit in a GALT-null D. melanogaster model of classic galactosemia Jennifer M. I. Daenzer, et al https://doi.org/10.1002/jimd.12774

Dr Roman Trepp attempts to answer the question, Do early-treated adults with phenylketonuria sense high phenylalanine levels? Do early-treated adults with phenylketonuria sense high phenylalanine levels? Laura Hauri, Raphaela Muri, Regula Everts, Roman Trepp https://doi.org/10.1002/jmd2.12446

Professors Fréd Vaz and Ronald Wanders present an entertaining and informative overview of fatty acid homeostasis and explain why the catabolic and anabolic processes cannot be considered separately. Disorders of fatty acid homeostasis Frédéric M. Vaz, et al https://doi.org/10.1002/jimd.12734

Dr Annet Bosch describes three cases where young adults developed worsening neurological symptoms after a change in diet. Initially confused with Guillan-Barré Syndrome, this treatable condition may be hard to diagnose but devastating to miss. Find full details here: https://doi.org/10.1002/jmd2.12427

Dr Irena Muffels is joined by Professor Eva Morava to discuss insights into heterozygous DHDDS variants, an autosomal dominant IMD that appears to impact on multiple different metabolic pathways. Assessing age of onset and clinical symptoms over time in patients with heterozygous pathogenic DHDDS variants I. J. J. Muffels, et al https://doi.org/10.1002/jimd.12769

Professor Phillip Pearl joins Eva Morava to discuss the footprints of metabolic epilepsies and a very brief introduction to the intertwined nature of music and neurology. Read the referenced paper here: https://doi.org/10.1016/j.ymgme.2023.107690 Find IMDs associated with epilepsies at: http://iembase.org/gamuts/store/docs/IMDs_presenting_with_epilepsies_010124.pdf

Dr Henry Lee joins the podcast to discuss the challenges of developing gene therapies for inherited disorders of neurotransmission and shares the progress that his group has made with SSADH deficiency. Gene replacement therapies for inherited disorders of neurotransmission: Current progress in succinic semialdehyde dehydrogenase deficiency Henry H. C. Lee, et al https://doi.org/10.1002/jimd.12735

Dr Tom Hartl discusses his group's work with a mouse model that knocks out both GALT and GALK and the insights that this provides into classic galactosemia. Galactokinase 1 is the source of elevated galactose-1-phosphate and cerebrosides are modestly reduced in a mouse model of classic galactosemia Linley Mangini, et al https://doi.org/10.1002/jmd2.12438

Marjorie Dixon and Annemiek van Wegberg join guest host Curtis Coughlin II to complete the treatment puzzle in pyridoxine dependent epilepsy and explain the role and practicalities of lysine restriction in PDE. Dietary management for pyridoxine-dependent epilepsy due to α-aminoadipic semialdehyde dehydrogenase deficiency, a follow-on from the international consortium guidelines Marjorie Dixon, et al https://doi.org/10.1002/jmd2.12418

Nenad Blau hosts Professor David Cassiman as he explains when to consider a metabolic differential in pediatric and adult liver disease. Read the referenced paper here: https://doi.org/10.1016/j.ymgme.2019.04.002 Find liver disorders associated with IMDS at: http://iembase.org/gamuts/store/docs/Liver_disorders_in_inherited_metabolic_disorders.pdf

In the latest shortcast, Inez Bosnyak describes a case of ALG1-CDG presenting without an abnormal isoelectric focusing pattern. Normal transferrin glycosylation does not rule out severe ALG1 deficiency Inez Bosnyak, et al https://doi.org/10.1002/jmd2.12415

Speech & neural oscillation in classic galactosemia by Journal of Inherited Metabolic Disease

Alexandre Nguyen and Manuel Schiff share the story of two siblings with severe haemolytic anaemia developing in previously well controlled methionine synthase reductase deficiency. Late-onset refractory hemolytic anemia in siblings treated for methionine synthase reductase deficiency: A rare complication possibly prevented by hydroxocobalamin dose escalation? Alexandre Nguyen, et al https://doi.org/10.1002/jmd2.12422

Dr Fanny Mochel returns to the podcast to answer the question, "What can pediatricians learn from adult inherited metabolic diseases?" What can pediatricians learn from adult inherited metabolic diseases? Fanny Mochel https://doi.org/10.1002/jimd.12729

Dr Vykunta Raju K N, Professor of Paediatric Neurology discusses a child presenting with IUGR, microcephaly, cataracts, developmental delay, seizures, and cerebral atrophy. L-Serine Biosynthesis Defect: A Treatable Condition Masquerading as TORCH Infection Vykuntaraju K. Gowda et al https://link.springer.com/article/10.1007/s12098-024-05181-3

Eva Morava discusses the creation of the IEMbase with Nenad Blau before the pair welcome Gabriella Horvath to discuss metabolic mimics of cerebral palsy in the first episode of the footprints series. Read the referenced paper here: https://doi.org/10.1016/j.ymgme.2021.03.008 Find all the metabolic mimics of CP at http://iembase.org/gamuts/store/docs/Metabolic_mimics_of_cerebral_palsy.pdf