Genome-wide association study identifies a susceptibility locus for biliary atresia on 10q24.2.

Abstract:

:Biliary atresia (BA) is characterized by the progressive fibrosclerosing obliteration of the extrahepatic biliary system during the first few weeks of life. Despite early diagnosis and prompt surgical intervention, the disease progresses to cirrhosis in many patients. The current theory for the pathogenesis of BA proposes that during the perinatal period, a still unknown exogenous factor meets the innate immune system of a genetically predisposed individual and induces an uncontrollable and potentially self-limiting immune response, which becomes manifest in liver fibrosis and atresia of the extrahepatic bile ducts. Genetic factors that could account for the disease, let alone for its high incidence in Chinese, are to be investigated. To identify BA susceptibility loci, we carried out a genome-wide association study (GWAS) using the Affymetrix 5.0 and 500 K marker sets. We genotyped nearly 500 000 single-nucleotide polymorphisms (SNPs) in 200 Chinese BA patients and 481 ethnically matched control subjects. The 10 most BA-associated SNPs from the GWAS were genotyped in an independent set of 124 BA and 90 control subjects. The strongest overall association was found for rs17095355 on 10q24, downstream XPNPEP1, a gene involved in the metabolism of inflammatory mediators. Allelic chi-square test P-value for the meta-analysis of the GWAS and replication results was 6.94 x 10(-9). The identification of putative BA susceptibility loci not only opens new fields of investigation into the mechanisms underlying BA but may also provide new clues for the development of preventive and curative strategies.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Garcia-Barceló MM,Yeung MY,Miao XP,Tang CS,Cheng G,So MT,Ngan ES,Lui VC,Chen Y,Liu XL,Hui KJ,Li L,Guo WH,Sun XB,Tou JF,Chan KW,Wu XZ,Song YQ,Chan D,Cheung K,Chung PH,Wong KK,Sham PC,Cherny SS,Tam PK

doi

10.1093/hmg/ddq196

subject

Has Abstract

pub_date

2010-07-15 00:00:00

pages

2917-25

issue

14

eissn

0964-6906

issn

1460-2083

pii

ddq196

journal_volume

19

pub_type

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