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COMPARATIVE STUDY
JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
RESEARCH SUPPORT, U.S. GOV'T, P.H.S.
Sequence variants of the gene encoding chemoattractant receptor expressed on Th2 cells (CRTH2) are associated with asthma and differentially influence mRNA stability.
Human Molecular Genetics 2004 November 2
The gene, CRTH2, encoding a receptor for prostaglandin D(2) (PGD(2)), is located within the peak linkage region for asthma on chromosome (Chr.) 11q reported in African American families. Family-based analysis of asthma and two common SNPs [G1544C and G1651A (rs545659)] in the 3'-untranslated region of CRTH2 showed significant evidence of linkage in the presence of disequilibrium for the 1651G allele (P = 0.003) of SNP rs545659. Haplotype analysis yielded additional evidence of linkage disequilibrium for the 1544G-1651G haplotype (P < 0.001). Population-based case-control analyses were conducted in two independent populations, and demonstrated significant association of the 1544G-1651G haplotype with asthma in an African American population (P = 0.004), and in a population of Chinese children (P < 0.001). Moreover, in the Chinese children the frequency of the 1651G allele in near-fatal asthmatics was significantly higher than mild-to-moderate asthmatics (P = 0.001) and normal controls (P < 0.001). The 1651G allele of SNP re545659 was also associated with a higher degree of bronchial hyperresponsiveness (P < 0.027). Transcriptional pulsing experiments showed that the 1544G-1651G haplotype confers a significantly higher level of reporter mRNA stability, when compared with a non-transmitted haplotype (1544C-1651A), suggesting that the CRTH2 gene on Chr. 11q is a strong candidate gene for asthma.
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