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Several Polymorphisms of KCNQ1 Gene Are Associated with Plasma Lipid Levels in General Chinese Populations

Author

Listed:
  • Xing-dong Chen
  • Ya-jun Yang
  • Shu-yuan Li
  • Qian-qian Peng
  • Li-juan Zheng
  • Li Jin
  • Xiao-feng Wang

Abstract

Background: Potassium voltage-gated channel, KQT-like subfamily, member 1 (KCNQ1) is thought to be an important candidate gene of diabetes. Several single nucleotide polymorphisms (SNPs) in a 40-kb linkage disequilibrium (LD) block in its intron 15 have been identified to be associated with diabetes in East Asian populations in recent genome-wide association studies. The aim of this study was to investigate whether KCNQ1 polymorphisms influence the levels of the metabolic phenotypes in general Chinese populations. Methodology/Principal Findings: We investigated the associations of two SNPs (rs2237892 and rs2237895) in the aforementioned 40-kb LD block, a missense variant rs12720449 (P448R) in exon 10, and a synonymous variant rs1057128 (S546S) in exon 13 with metabolic phenotypes in a Uyghur population (n = 478) and replicated these associations in a Han population (n = 2,485). We found that rs2237892-T allele was significantly associated with decreased triglyceride levels (pcombined = 0.001). The minor G allele of the rs12720449, with sharp difference of the allelic frequency between European and East Asian populations (0.2% versus 14%, respectively), was associated with a lower triglyceride levels than G allele in Uyghur subjects (p = 0.004), in Han subjects (p = 0.052), and in subjects of meta-analysis (pcombined = 0.001). Moreover, the minor A allele of the rs1057128 was also associated with decreased triglyceride levels in meta-analysis (pcombined = 0.010). Conclusions: To the best of our knowledge, this is the first report associating a missense mutation of KCNQ1, rs12720449, with triglyceride levels. Rs2237892, representing the 40-kb LD block, is also associated with triglyceride levels in Han population. Further studies are required to replicate these findings in other East Asian populations.

Suggested Citation

  • Xing-dong Chen & Ya-jun Yang & Shu-yuan Li & Qian-qian Peng & Li-juan Zheng & Li Jin & Xiao-feng Wang, 2012. "Several Polymorphisms of KCNQ1 Gene Are Associated with Plasma Lipid Levels in General Chinese Populations," PLOS ONE, Public Library of Science, vol. 7(3), pages 1-5, March.
    • Handle: RePEc:plo:pone00:0034229
    DOI: 10.1371/journal.pone.0034229
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    1. Tanya M. Teslovich & Kiran Musunuru & Albert V. Smith & Andrew C. Edmondson & Ioannis M. Stylianou & Masahiro Koseki & James P. Pirruccello & Samuli Ripatti & Daniel I. Chasman & Cristen J. Willer & C, 2010. "Biological, clinical and population relevance of 95 loci for blood lipids," Nature, Nature, vol. 466(7307), pages 707-713, August.
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