OrphaChat — a Rare Disease Podcast

In this episode, we explore Human Adenovirus (HAdV), a double-stranded DNA virus that typically causes mild respiratory or gastrointestinal illnesses in healthy individuals but poses a life-threatening risk to immunocompromised patients, particularly haematopoietic stem cell (HSCT) and solid organ transplant recipients. We discuss how severe manifestations—such as pneumonia, hepatitis, and haemorr...

In this episode, we explore the diagnosis and management of anal fistulas and anorectal malformations (ARMs), distinguishing between acquired conditions and congenital defects like H-type fistulas and the VACTERL association. We break down the trade-offs in surgical interventions, comparing the recurrence rates and continence risks of sphincter-sparing techniques (like LIFT) versus traditional fis...

In this episode, we examine Biliary Atresia (BA), a rare and severe neonatal liver disorder characterized by the progressive obstruction of bile ducts. We discuss the critical importance of early screening using stool colour cards and the serum biomarker MMP-7, alongside the 2025 clinical practice guidelines for diagnosis and management. We explore the complex aetiology of the disease, including t...

In this episode, we explore  hypospadias , a common congenital condition affecting approximately 1 in 200 to 300 newborn males where the urethral opening is displaced. We unpack the complex  etiology  involving genetic mutations in genes like  MAMLD1  and  AR , alongside environmental factors. We also discuss  surgical standards , typically recommended between 6 and 18 months of age using techniqu...

In this episode, we explore the 2024 landscape of Cystic Fibrosis, where widespread use of CFTR modulators like Trikafta has pushed median predicted survival to nearly 70 years and drastically reduced lung transplants. We discuss the latest clinical advancements—including the "next-generation" Vanzacaftor triple therapy—and the urgent race to develop gene editing and mRNA solutions for t...

In this episode, we explore Brugada Syndrome, a rare genetic arrhythmia characterized by specific "coved" ST-segment elevations on an electrocardiogram (ECG) that predisposes individuals to ventricular fibrillation and sudden cardiac death. We discuss its epidemiology, noting a distinct prevalence in men and individuals of Southeast Asian descent, as well as its tendency to cause cardiac...

In this episode, we explore Vulvar Intraepithelial Neoplasia (VIN), a precancerous condition now classified primarily into HPV-associated High-grade Squamous Intraepithelial Lesions (HSIL) and the more aggressive, HPV-independent differentiated VIN (dVIN). We examine the shift from surgical excision as the sole standard of care to medical interventions like topical imiquimod and cidofovir, which o...

In this episode, we explore the diagnosis and management of Limbal Stem Cell Deficiency (LSCD), a blinding ocular surface disease caused by burns, contact lens wear, and genetic disorders. We discuss established surgical treatments like SLET and CLAU, alongside cutting-edge advances in 3D bioprinting and induced pluripotent stem cell (iPSC) therapies for corneal regeneration.

In this episode, we explore Congenital Sucrase-Isomaltase Deficiency (CSID), a genetic disorder impairing the digestion of sugar and starch that is frequently misdiagnosed as Irritable Bowel Syndrome (IBS). We discuss the wide spectrum of symptoms, ranging from chronic diarrhea to bloating, and how variants in the SI gene contribute to the condition. Finally, we review diagnostic tools and managem...

In this episode, we explore the latest developments in Marfan syndrome , a genetic condition caused by mutations in the FBN1 gene that affects connective tissue in the heart, eyes and skeleton. We discuss the $1.44 million in 2025 research grants awarded by The Marfan Foundation, which support cutting-edge projects like using digital twin technology to predict aortic risk and identifying new bioma...

In this episode, we explore the diagnosis and management of Myasthenia Gravis , an autoimmune disorder characterized by fluctuating muscle weakness,. We break down diagnostic tools, contrasting the high sensitivity of single-fiber electromyography (SFEMG) with repetitive nerve stimulation and serological testing for AChR, MuSK, and LRP4 antibodies ,,. Finally, we discuss the shifting treatment par...

In this episode, we explore Alpha-1 Antitrypsin Deficiency (AATD), an inherited disorder caused by mutations in the SERPINA1 gene that can lead to early-onset emphysema and liver cirrhosis. We break down the challenges of diagnosing this under-recognized condition, detailing how laboratory experts distinguish between common deficiency alleles like Z and S, as well as rare variants such as Mmalton...

In this episode, we explore Tenosynovial Giant Cell Tumor (TGCT), a rare, locally aggressive neoplasm of the joint synovium driven by colony-stimulating factor 1 (CSF1) overexpression. We discuss the distinction between the localized and diffuse subtypes, noting the latter's potential for joint destruction and high recurrence rates following surgery. Finally, we cover the emergence of targeted...

In this episode, we explore the rapidly evolving landscape of Spinal Muscular Atrophy (SMA), a genetic neuromuscular disorder characterised by the degeneration of motor neurones due to a deficiency in the survival motor neurone (SMN) protein,. We discuss the paradigm shift from palliative care to disease-modifying interventions, highlighting the three established therapies—nusinersen, onasemnogene...

In this episode, we explore the complexities of sarcoidosis , a systemic inflammatory disease characterized by the formation of non-caseating granulomas that predominantly affect the lungs and lymph nodes but can impact virtually any organ, including the heart, skin, and nervous system. We examine the elusive etiology of the disease, which likely involves a "perfect storm" of genetic sus...

In this episode, we explore why HIV-associated wasting syndrome remains a critical health concern despite modern antiretroviral therapy, examining the metabolic factors and cytokine imbalances driving involuntary weight loss. We also discuss the FDA's June 2025 approval of lenacapavir (Yeztugo), a groundbreaking twice-yearly injectable for HIV prevention, and break down how the virus "hij...

In this episode, we dive into the complex world of Juvenile Idiopathic Arthritis (JIA), exploring its distinct subtypes—from the common oligoarticular form to the autoinflammatory systemic JIA. We unpack the critical link between JIA and chronic uveitis, a potentially blinding eye condition that demands rigorous screening, and review the latest American College of Rheumatology guidelines shifting...

In this episode, we explore the genetic landscape of Y-chromosome microdeletions, a leading cause of male infertility affecting the Azoospermia Factor (AZF) regions. We examine the distinct clinical outcomes for AZFa, AZFb, and AZFc deletions—ranging from complete spermatogenic failure to successful sperm retrieval via micro-TESE. Finally, we discuss the critical role of genetic counseling regardi...

In this episode, we examine pouchitis , the most frequent long-term complication following ileal pouch-anal anastomosis (IPAA) surgery for ulcerative colitis, affecting up to 80% of patients. We break down the 2024 AGA Clinical Practice Guidelines , covering the use of antibiotics for intermittent symptoms and the shift toward advanced immunosuppressive therapies—such as vedolizumab—for chronic, a...

In this episode, we explore the evolving landscape of invasive fungal diseases, dissecting the impact of the revised 2020 EORTC/MSGERC diagnostic criteria and the newly established FUNDICU definitions for critically ill patients. We also examine the rising threat of azole-resistant Aspergillus , updated 2025 guidelines for treating Aspergillosis and Histoplasmosis, and the specific infection risks...

In this episode, we explore the persistent challenge of subconjunctival fibrosis and scarring in glaucoma filtration surgery, which remains the leading cause of surgical failure despite the standard use of antimetabolites like Mitomycin C (MMC) and 5-fluorouracil (5-FU). We examine the evolution of surgical interventions, from traditional trabeculectomy to modern minimally invasive glaucoma surger...

In this episode, we explore Multicystic Dysplastic Kidney (MCDK) , a common congenital anomaly where a non-functioning kidney is replaced by non-communicating cysts due to disrupted nephrogenesis. We discuss the clinical shift from prophylactic nephrectomy to conservative 'watch and wait' management, driven by evidence that the majority of these kidneys spontaneously involute and carry a n...

In this episode, we unpack the major updates in the 2025 EASL Clinical Practice Guidelines for Autoimmune Hepatitis (AIH), including the removal of AIH subclassification recommendations and the introduction of Mycophenolate Mofetil (MMF) as a viable first-line alternative to azathioprine. We examine the rising global prevalence of AIH, particularly among older adults and minority populations in th...

In this episode, we examine 16p11.2 deletion and duplication syndromes , exploring how a specific chromosomal change creates "mirror" physical effects: deletions are linked to obesity and larger head size, while duplications are associated with low BMI and smaller head size. We discuss core neurological impacts, including speech apraxia , autism , and seizure susceptibility , as well as...

In this episode, we navigate the complex landscape of Congenitally Uncorrected (d-TGA) and Corrected Transposition of the Great Arteries (ccTGA), distinguishing between the neonatal emergency of d-TGA's "parallel circulation" and the rare "double discordance" of ccTGA, where the heart is physiologically functional but relies on the weaker right ventricle to pump blood to th...