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Phenotypic and genetic heterogeneity in Niemann-Pick disease type C: current knowledge and practical implications
1INSERM-CNRS, Unit 189, Lyon-Sud School of Medicine, Oullins, France.
Wiener Klinische Wochenschrift
|February 14, 1997
Summary
Niemann-Pick disease encompasses distinct types. Niemann-Pick type C involves cholesterol transport defects, while types A and B are sphingomyelinase deficiencies, presenting diagnostic challenges and genetic heterogeneity.
Area of Science:
- Biochemistry
- Genetics
- Cell Biology
Background:
- Niemann-Pick disease is a group of inherited metabolic disorders.
- Niemann-Pick type C (NPC) is characterized by cholesterol transport abnormalities.
- Niemann-Pick types A and B result from acid sphingomyelinase deficiency.
Purpose of the Study:
- To review current knowledge on cholesterol processing defects in NPC.
- To outline the disease's spectrum of expression and diagnostic challenges.
- To discuss recent genetic findings in NPC.
Main Methods:
- Review of existing literature on Niemann-Pick disease.
- Analysis of patient data from over 350 cases.
- Cell hybridization studies to investigate genetic heterogeneity.
Main Results:
- NPC involves intracellular cholesterol transport defects with lysosomal sequestration.
- There is a poor correlation between clinical and biochemical phenotypes in NPC.
- NPC exhibits intergenic heterogeneity with major and minor complementation groups.
Conclusions:
- NPC is genetically heterogeneous, with a major gene mapped to 18q11-12.
- Further research is needed to understand the function of NPC genes.
- Diagnostic challenges persist due to phenotypic variability.