The Nova Scotia (type D) form of Niemann-Pick disease is caused by a G3097-->T transversion in NPC1. |
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| Authors: | W L Greer D C Riddell T L Gillan G S Girouard S M Sparrow D M Byers M J Dobson P E Neumann |
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| Affiliation: | Department of Pathology, Faculty of Medicine, Dalhousie University, Halifax, Nova Scotia. wgreer@IS.Dal.ca |
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| Abstract: | Niemann-Pick type D (NPD) disease is a progressive neurodegenerative disorder characterized by the accumulation of tissue cholesterol and sphingomyelin. This disorder is relatively common in southwestern Nova Scotia, because of a founder effect. Our previous studies, using classic linkage analysis of this large extended kindred, defined the critical gene region to a 13-cM chromosome segment between D18S40 and D18S66. A recently isolated gene from this region, NPC1, is mutated in the majority of patients with Niemann-Pick type C disease. We have identified a point mutation within this gene (G3097-->T; Gly992-->Trp) that shows complete linkage disequilibrium with NPD, confirming that NPD is an allelic variant of NPC1. |
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