Original Paper

Genetic Impact of Functional Single Nucleotide Polymorphisms in the 3'-UTR Region of the Chemoattractant Receptor Expressed on Th2 Cells (CRTH2) Gene on Asthma and Atopy in a Japanese Population
Yukiko Maeda, Nobuyuki Hizawa, Daisuke Takahashi, Yoshinobu Fukui, Satoshi Konno, Masaharu Nishimura

First Department of Medicine, Hokkaido University School of Medicine, Sapporo, Japan

Address of Corresponding Author

Int Arch Allergy Immunol 2007;142:51-58 (DOI: 10.1159/000095998)

  Key Words

• Chemoattractant receptor expressed on Th2 cells (CRTH2)
• Polymorphism
• Atopy
• Asthma

  Abstract

Background: The human chemoattractant receptor expressed on Th2 cells (CRTH2), the receptor for prostaglandin D₂, induces cell migration in eosinophils, basophils, and Th2 cells. The gene encoding CRTH2 is located on chromosome 11q13. Several groups, including ours, have reported significant associations between this region and various traits associated with allergic diseases such as asthma and atopy. Two single nucleotide polymorphisms in the 3'-UTR of the CRTH2 gene (1544GC and 1651GA) are associated with the mRNA stability of the gene; they have also been associated with asthma in both African American and Chinese populations. Methods: Because CRTH2 is a biologically important candidate gene on chromosome 11q13, we conducted a case-control analysis using 787 Japanese subjects (384 asthmatics and 403 controls) to evaluate the genetic impact of the CRTH2 gene on asthma and asthma-related traits. Four polymorphisms [1544GC (rs11571288), 1651GA (rs545659), 11336TC (rs2074422), and 12375GT (rs561285)] were studied. Results: The allele, genotype, or haplotype frequencies for 2 functional polymorphisms in our Japanese population were significantly different from those in the Chinese or African American populations. No association was found between any polymorphisms or haplotypes in the CRTH2 gene and asthma, atopy, or total serum IgE levels in a Japanese population. Conclusions: Our data failed to support previous associations of functional polymorphisms at the 3'-UTR of the CRTH2 gene implicated in asthma. We did show a significant difference in the allele and genotype frequencies as well as different haplotype frequencies among African American, Chinese, and Japanese populations, suggesting that the genetic impacts of these functional polymorphisms on asthma and asthma-related phenotypes may vary in different populations.

Copyright © 2007 S. Karger AG, Basel

  Author Contacts

Correspondence to: Dr. Nobuyuki Hizawa
First Department of Medicine
Hokkaido University School of Medicine, N15, W7, Kita-ku
Sapporo, Hokkaido 060-8638 (Japan)
Tel. +81 11 706 5911, Fax +81 11 706 7899, E-Mail nhizawa@med.hokudai.ac.jp

  Article Information

Received: November 28, 2005
Accepted after revision: June 27, 2006
Published online: October 2, 2006
Number of Print Pages : 8
Number of Figures : 1, Number of Tables : 5, Number of References : 25