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Niemann-Pick disease type C: two cases and an update
E Y Uc1, D A Wenger, J Jankovic
1Department of Neurology, University of Arkansas for Medical Sciences, Little Rock 72205, USA.
Summary
Juvenile-onset Niemann-Pick disease type C (NPC) presents with diverse neurological symptoms, impacting patients differently over time. Early misdiagnosis is common, highlighting the need for accurate diagnostic methods for this rare genetic disorder.
Area of Science:
- Neuroscience
- Genetics
- Metabolic Disorders
Background:
- Niemann-Pick disease type C (NPC) is a rare, autosomal recessive lysosomal storage disorder.
- NPC is characterized by the accumulation of cholesterol and other lipids within lysosomes.
- Genetic mutations disrupt intracellular cholesterol trafficking, leading to cellular dysfunction.
Observation:
- Two patients with juvenile-onset NPC exhibited highly variable neurological presentations.
- Patient 1: Hypersplenism at age 10, misdiagnosed as Gaucher disease; developed seizures in teens, later dementia, dysarthria, ophthalmoplegia, polyneuropathy, and ataxia by mid-30s.
- Patient 2: Rapidly progressive dystonia at age 8, with dementia, behavioral disorder, and ophthalmoplegia by age 14.
Findings:
- Diagnosis confirmed by deficient cholesterol esterification and excessive lysosomal filipin staining in fibroblasts.
- Clinical heterogeneity underscores the broad spectrum of NPC neurological manifestations.
- Delayed diagnosis can occur due to overlapping symptoms with other metabolic disorders.
Implications:
- Highlights the importance of considering NPC in juvenile-onset neurological disorders with systemic involvement.
- Emphasizes the need for advanced diagnostic techniques for accurate and timely NPC diagnosis.
- Understanding NPC pathogenesis is crucial for developing effective therapeutic strategies.