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Pubmed ID :11754101
Publication Date : //

NPC1: Complete genomic sequence, mutation analysis, and characterization of haplotypes.


Niemann-Pick type C disease (NP-C) is a rare, autosomal recessive lipid storage disorder. At least 96% of all NP-C patients link to NPC1 which encodes for a lysosomally-targeted protein. We describe the complete genomic sequence of 57,052 kb corresponding to the transcribed region of human NPC1 including several exonic and intronic single nucleotide polymorphisms (SNPs). Sequencing of all exons, splice sites, and the promoter region of NPC1 in 12 unrelated Caucasian NP-C patients revealed nine novel and four known most likely disease-causing mutations. Ten unique mutations found only once in 24 disease alleles were observed in patients being compound heterozygous for two different mutations. Two of the three missense mutations identified more than once were observed in a total of four patients homozygous for the respective mutation along with homozygosity for the underlying haplotype. The patients were offspring of most likely nonconsanguineous couples. Based upon genotyping exonic SNPs c.2572A>G (I858V; g.45020A>G) and c.2793C>T (N931N; g.45686C>T) and segregation analysis we characterized the haplotype of all 24 NPC1 alleles and of 138 alleles of healthy Caucasian control subjects. All four permutations between the two SNPs were identified in the control alleles: 2572A-2793C (50%), 2572G-2793T (41%), 2572G-2793C (5%), and 2572A-2793T (4%). These data are suggestive for an ancestral intragenic recombination within a genomic fragment of <666 bp. While 17 of 24 NP-C alleles (71%) shared haplotype 2572G-2793T, this haplotype accounted for only 41% in the controls (p=0.007; 2-sided Fisher exact test) suggesting the possibility of an influence of the haplotypic background on expression of missense mutations in NPC1.

Authors : Bauer Peter , Knoblich Rupert , Bauer Claudia , Finckh Ulrich , Hufen Antje , Kropp Julia , Braun Silja , Kustermann-Kuhn Birgit , Schmidt Dörthe , Harzer Klaus , Rolfs Arndt ,

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