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NPC1: Complete genomic sequence, mutation analysis, and characterization of haplotypes.
Peter Bauer1, Rupert Knoblich, Claudia Bauer
1Universität Rostock, Klinik für Neurologie und Poliklinik, Neurobiologisches Labor, Rostock, Germany.
Human Mutation
|December 26, 2001
Summary
Niemann-Pick type C disease (NP-C) is a rare genetic disorder linked to NPC1 mutations. Researchers identified novel mutations and found a specific NPC1 haplotype associated with NP-C, suggesting its influence on disease expression.
Area of Science:
- Genetics
- Molecular Biology
- Biochemistry
Background:
- Niemann-Pick type C disease (NP-C) is a rare, autosomal recessive lysosomal lipid storage disorder.
- Mutations in the NPC1 gene, encoding a lysosomal protein, cause at least 96% of NP-C cases.
Purpose of the Study:
- To sequence the transcribed region of the human NPC1 gene.
- To identify disease-causing mutations in NP-C patients.
- To analyze NPC1 haplotypes and their association with NP-C.
Main Methods:
- Complete genomic sequencing of the transcribed NPC1 region.
- Sequencing of NPC1 exons, splice sites, and promoter in NP-C patients.
- Genotyping of exonic SNPs and segregation analysis for haplotype characterization.
Main Results:
- Nine novel and four known mutations in NPC1 were identified in 12 NP-C patients.
- Ten unique mutations were found in compound heterozygous patients.
- A specific haplotype (2572G-2793T) was significantly more frequent in NP-C alleles (71%) than in controls (41%).
Conclusions:
- The study identified multiple NPC1 mutations underlying Niemann-Pick type C disease.
- An ancestral intragenic recombination within NPC1 is suggested.
- The findings suggest a potential influence of the NPC1 haplotypic background on the expression of missense mutations.