CDKAL1 and HHEX are associated with type 2 diabetes-related traits among Yup'ik people

Yann C. Klimentidis, Dominick J. Lemas, Howard H. Wiener, Diane M. O'Brien, Peter J Havel, Kimber Stanhope, Scarlett E. Hopkins, Hemant K. Tiwari, Bert B. Boyer

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Background: Genome-wide association studies (GWAS) have identified single nucleotide polymorphisms (SNPs) associated with type 2 diabetes (T2D), mainly among individuals of European ancestry. In the present study, we examined the frequency of these SNPs and their association with T2D-related traits in an Alaska Native study population with a historically low prevalence of T2D. We also investigated whether dietary characteristics that may protect against T2D, such as n-3 polyunsaturated fatty acid (PUFA) intake, modify these associations. Methods: In 1144 Yup'ik people, we examined 17 SNPs repeatedly identified in GWAS for individual and cumulative associations with T2D-related traits. Cumulative associations were evaluated using a genetic risk score (GRS) calculated by summing risk alleles. Associations were tested for interactions with sex, body mass index (BMI), and n-3 PUFA intake. Results: The rs7754840 SNP in CDKAL1 is significantly associated with HbA1c (P=0.00091). The rs5015480 SNP near HHEX is significantly associated (in opposite direction to that in Europeans) with a combined fasting glucose (FG) and HbA1c measure (P=0.00046) and with homeostatic model assessment of β-cell function (HOMA-B; P=0.0014). The GRS is significantly associated with FG and combined FG and HbA1c only when the HHEXSNP is dropped from the GRS. Associations are not modified by BMI or n-3 PUFA intake. Conclusion: Our results highlight the potential importance of CDKAL1 and HHEX in glucose homeostasis in this Alaska Native population with a low prevalence of T2D, and suggest that these loci should be examined in greater detail in this population.

Original languageEnglish (US)
Pages (from-to)251-259
Number of pages9
JournalJournal of Diabetes
Volume6
Issue number3
DOIs
StatePublished - 2014

Keywords

  • Alaska Native
  • Glycemic traits
  • N-3 polyunsaturated fatty acids
  • Type 2 diabetes single nucleotide polymorphisms

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism

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    Klimentidis, Y. C., Lemas, D. J., Wiener, H. H., O'Brien, D. M., Havel, P. J., Stanhope, K., Hopkins, S. E., Tiwari, H. K., & Boyer, B. B. (2014). CDKAL1 and HHEX are associated with type 2 diabetes-related traits among Yup'ik people. Journal of Diabetes, 6(3), 251-259. https://doi.org/10.1111/1753-0407.12093