NDLI: The Demographics and Distribution of Type B Niemann-Pick Disease: Novel Mutations Lead to New Genotype/Phenotype Correlations

Content Provider	PubMed Central
Author	Simonaro, Calogera M. Desnick, Robert J. Mcgovern, Margaret M. Wasserstein, Melissa P. Schuchman, Edward H.
Copyright Year	2002
Abstract	We have collected demographic and/or mutation information on a worldwide sample of 394 patients with type B Niemann-Pick disease (NPD). The disorder is panethnic, with the highest incidence occurring in individuals of Turkish, Arabic, and North African descent. Only five of the 394 patients were Ashkenazi Jewish, revealing that, unlike the type A form of NPD, type B NPD does not occur frequently within this population. Mutation analysis of the acid sphingomyelinase (ASM) gene (designated “SMPD1”) was performed on 228 patients (324 unique alleles), and several novel, “common” mutations were found. Among these were the L137P, fsP189, and L549P mutations, which accounted for ∼75% of the alleles in Turkish patients, the H421Y and K576N mutations, which accounted for ∼85% of the alleles in Saudi Arabian patients, the S379P, R441X, R474W, and F480L mutations, which accounted for ∼55% of the alleles in Portuguese/Brazilian patients, and the A196P mutation, which accounted for ∼42% of the alleles in Scottish/English patients. The previously reported ΔR608 mutation occurred on ∼12% of the alleles studied. Overall, a total of 45 novel mutations were found, and several new genotype/phenotype correlations were identified. In particular, the L137P, A196P, and R474W mutations were consistent with a less severe form of type B NPD, whereas the H421Y and K576N mutations led to an early-onset, more severe form that was specific to Saudi Arabia. These data provide the first extensive demographic assessment of this disorder and describe several new mutations that can be used to predict phenotypic outcome and to gain new insights into the structure and function of ASM.
Related Links	http://dx.doi.org/10.1086/345074
Ending Page	1419
Page Count	7
Starting Page	1413
File Format	PDF
ISSN	00029297
e-ISSN	15376605
Journal	American Journal of Human Genetics
Issue Number	6
Volume Number	71
Language	English
Publisher	The American Society of Human Genetics
Publisher Date	2002-12-01
Access Restriction	Open
Rights Holder	The American Society of Human Genetics
Subject Keyword	Genetics(clinical) Genetics Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics Genetics (clinical)

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