Journal
JOURNAL OF HUMAN GENETICS
Volume 50, Issue 12, Pages 611-617Publisher
NATURE PUBLISHING GROUP
DOI: 10.1007/s10038-005-0302-4
Keywords
asthma; histamine N-methyltransferase (HNMT); genetic association studies; haplotypes; Indian population; SNPs; serum IgE
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Histamine plays a major role in allergic disorders, including asthma. A major pathway of histamine biotransformation in the lungs is mediated by histamine N-methyltransferase (HNMT). We investigated the association of a functional SNP C314T; a SNP A929G, a (CA)(n) repeat in intron 5, and a novel (CA)(n) repeat (BV677277), 7.5 kb downstream of the HNMT gene with asthma and its associated traits such as total serum IgE levels in a case-control as well as in a family-based study design. In contrast to a previous study, no association was observed for the polymorphisms investigated with asthma (P > 0.05). When haplotypes were constructed for these loci and compared, no significant difference was observed in the distribution between cases and controls. In the family-based design, no biased transmission was observed for any of the polymorphisms and haplotypes with asthma using the additive model of inheritance in family-based association test (FBAT). Thus, consistent with the case-control findings, the polymorphisms and haplotypes in the HNMT gene are not associated with asthma in the Indian population.
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