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Imprinting at the SMPD1 locus: implications for acid sphingomyelinase-deficient Niemann-Pick disease.

Abstract：

:Acid sphingomyelinase (ASM) is the lipid hydrolase that is deficient in types A and B Niemann-Pick disease (NPD). Here, we demonstrate that the gene encoding ASM (SMPD1) is paternally imprinted and that differential expression of the mutant alleles in patients with ASM-deficient NPD and in carriers influences the disease phenotype. Comparison of the results of genomic sequencing versus reverse-transcriptase polymerase chain reaction sequencing for several patients with NPD revealed preferential expression of one mutant allele. Further analysis of one family showed that the expressed allele was maternally inherited and that the distinct clinical presentations of the individual patients were correlated with the amount of residual ASM activity expressed from the maternal mutation. Treatment of NPD cell lines with 5-aza-2'-deoxycytidine enhanced the expression of the paternal SMPD1 allele, and bisulfite genomic sequencing identified which CpG dinucleotides within the SMPD1 promoter were methylated. In a related set of studies, we identified a carrier individual who had approximately 15% of normal ASM activity and clinical features of ASM-deficient NPD. DNA sequencing confirmed that this individual carried a single SMPD1 mutation and that this mutant allele was preferentially expressed. These data thus demonstrate, for the first time, imprinting at the SMPD1 gene and reveal the influence of this epigenetic modification on the presentation of ASM-deficient NPD.

journal_name

Am J Hum Genet

journal_title

American journal of human genetics

authors

Simonaro CM,Park JH,Eliyahu E,Shtraizent N,McGovern MM,Schuchman EH

doi

10.1086/503750

subject

Has Abstract

pub_date

2006-05-01 00:00:00

pages

865-870

issue

5

eissn

0002-9297

issn

1537-6605

pii

S0002-9297(07)63819-1

journal_volume

78

pub_type

杂志文章

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