genetic disease

Medicine
Russell-Silver Syndrome: Clinical Overview, Diagnostic Approach, and Evidence-Based Management Strategies
Bydoctorcostamed July 20, 2022April 12, 2026
Updated with Current Genetic Insights and Management Recommendations (2024) Epidemiology and Clinical Definition Russell–Silver syndrome (RSS; OMIM #180860, #601803) is a rare, clinically and genetically heterogeneous congenital growth disorder characterized by severe prenatal and postnatal growth retardation, relative macrocephaly at birth, characteristic facial features, body asymmetry, and feeding difficulties. Estimated incidence ranges from 1:30,000 to…
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Medicine
PURA Syndrome: A Comprehensive Clinical Overview
Bydoctorcostamed July 17, 2022April 12, 2026
Genetic Basis & Molecular Pathophysiology PURA syndrome (OMIM #616513) is a rare, autosomal dominant neurodevelopmental disorder caused by pathogenic variants in the PURA gene (Pur-alpha homolog, Drosophila; OMIM: 602479), located at chromosome 5q31.2. The gene spans ~18 kb and comprises five exons, encoding the PUR-alpha protein—a highly conserved, ubiquitously expressed nucleic acid-binding protein critical for…
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Medicine
Comprehensive Clinical Overview of Grayson–Wilbrandt Corneal Dystrophy (GWCD): A Rare Autosomal Recessive Mitochondrial Disorder
Bydoctorcostamed July 16, 2022April 12, 2026
1. Nomenclature & Classification Grayson–Wilbrandt Corneal Dystrophy (GWCD; OMIM #618546), often informally referred to as “Grayson’s Syndrome,” is a very rare, autosomal recessive corneal dystrophy classified under the mitochondrial subtype of corneal dystrophies in the International Classification of Corneal Dystrophies, 3rd edition (ICCD-3) [1]. It is distinct from nuclear envelope-related corneal dystrophies (e.g., REVERSI-type), and…
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Medicine
Klippel–Trenaunay Syndrome (KTS): A Comprehensive Clinical Overview for Healthcare Professionals
Bydoctorcostamed July 14, 2022April 12, 2026
Definition and EpidemiologyKlippel–Trenaunay syndrome (KTS; OMIM #150800) is a rare, non-hereditary congenital disorder characterized by a triad of features: Incidence is estimated at 1–5 per 100,000 live births, with no sex or ethnic predilection. KTS is considered a vascularOVERGROWTH spectrum disorder and is now classified under the broader entity PIK3CA-Related Overgrowth Spectrum (PROS), reflecting its…
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Medicine
Olmsted Syndrome: Comprehensive Clinical Overview for Healthcare Professionals with Current Evidence-Based Insights
Bydoctorcostamed July 13, 2022April 12, 2026
Definition & EpidemiologyOlmsted syndrome (OS; OMIM #164900) is an extremely rare, non-neoplastic congenital disorder characterized by progressive, symmetrical, mutilating palmoplantar keratoderma (PPK) with periorificial hyperkeratotic lesions. First described in 1928 by Olmsted et al., fewer than 100 cases have been reported worldwide to date—predominantly from consanguineous families or sporadic occurrences—indicating extreme rarity (prevalence <1:1,000,000). While…
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Medicine
Comprehensive Clinical Overview of 48,XXYY Syndrome: Pathogenesis, Phenotype, Diagnosis, Management, and Prognosis
Bydoctorcostamed July 10, 2022April 12, 2026
Epidemiology and Classification 48,XXYY syndrome is a rare sex chromosome aneuploidy affecting approximately 1 in 18,000–50,000 male births. It falls under the broader spectrum of Klinefelter variant syndromes, which includes 47,XXY (classic Klinefelter), 48,XXXY, and 49,XXXXY. Unlike classic Klinefelter (47,XXY), 48,XXYY involves two supernumerary sex chromosomes—one extra X and one extra Y—resulting in a 48,XXYY…
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Medicine
McCune Albright Syndrome
ByPrince Raphael D Costa June 19, 2021July 17, 2025
What is McCune Albright Syndrome? McCune Albright syndrome is a genetic disorder characterized by abnormal deposits of scar-like or fibrous tissue in bones and skin along with defects in endocrine (hormone-secreting) glands of the body. Cause of McCune Albright syndrome This disorder is caused by a mutation in the GNAS gene which codes for a…
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