Abstract
Asthma is caused by bronchial inflammation. This inflammation involves mucus overproduction and hypersecretion. Recently, a mouse model of asthma showed that gob-5 is involved in the pathogenesis of asthma. The gob-5 gene is involved in mucus secretion and its expression is upregulated upon antigen attack in sensitized mice. The observation suggests that human homologue of gob-5, hCLCA1 (human calcium-dependent chloride channel-1), may be involved in human disease. We screened for single-nucleotide polymorphisms (SNPs) in hCLCA1 in the Japanese population. We identified eight SNPs, and performed association studies using 384 child patients with asthma, 480 adult patients with asthma, and 672 controls. In haplotype analysis, we found a different haplotype distribution pattern between controls and childhood asthma (P<0.0001) and between controls and adult asthma (P=0.0031). We identified a high-risk haplotype (CATCAAGT haplotype; P=0.0014) and a low-risk haplotype (TGCCAAGT haplotype; P=0.00010) in cases of childhood asthma. In diplotype analysis, patients who had the CATCAAGT haplotype showed a higher risk for childhood asthma than those who did not (P=0.0011). Individuals who had the TGCCAAGT haplotype showed a lower risk for childhood asthma than those who did not (P<0.0001). Our data suggested that variation of the hCLCA1 gene affects patients' susceptibility for asthma.
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Acknowledgements
We are grateful to Drs Hiroko Endo, Reiko Takayanagi, Chifuyu Nakazawa (Department of Pediatrics, Tohoku Rosai Hospital, Sendai, Japan), Toshio Morikawa (Morikawa Children's clinic, Sendai), Miki Morikawa (Department of Pediatrics, JR Sendai Hospital), and Shigeaki Miyabayashi (Department of Pediatrics, Sendai National Hospital) for supporting our study. We thank all patients and their families, the volunteers who served as controls, and all staff members at the hospitals involved in this study. We also thank Ms Kumi Kato, Ms Yasuko Murayama, Mr Hiroshi Sekiguchi, and Ms Miki Kokubo for excellent technical assistance. This work was supported by Grants-in-Aid for Scientific Research from the Ministry of Education, Culture, Sports, Science and Technology, Japan, and grants from the Ministry of Health, Labor, and Welfare, Japan.
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Kamada, F., Suzuki, Y., Shao, C. et al. Association of the hCLCA1 gene with childhood and adult asthma. Genes Immun 5, 540–547 (2004). https://doi.org/10.1038/sj.gene.6364124
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DOI: https://doi.org/10.1038/sj.gene.6364124
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