Ethnic differences in the frequency of ENPP1/PC1 121Q genetic variant in the Dallas Heart Study cohort

Manisha Chandalia, Scott M Grundy, Beverley A Huet, Nicola Abate

Research output: Contribution to journalArticle

39 Scopus citations

Abstract

Genetic susceptibility modulates the impact of obesity on the risk for type 2 diabetes. One candidate gene predisposing to type 2 diabetes is ENPP1/PC1. A common polymorphism in this protein, K121Q, is associated with insulin resistance and increased susceptibility to type 2 diabetes in Caucasian, Afro-Caribbean, and South Asian populations. The goal of this study was to evaluate differences in the prevalence of the ENPP1 121Q variant in the Caucasian, African-American, and Hispanic populations in Dallas county and to establish a population-based estimate of gene variant prevalence for future investigations. We also evaluated the association between the ENPP1 121Q variant and diabetes. The Dallas Heart Study (DHS) is a multiethnic probability-based sample of the Dallas county population in which African-Americans were systematically oversampled so that the final sample was 50% African-Americans. We performed ENPP1/PC1 genotyping in 1038 non-Hispanic Whites (544 women, 494 men), 1815 African-Americans (1052 women and 763 men), and 597 Hispanics (347 women, 250 men). The frequency of ENPP1/PC1 K121Q was higher in both African-Americans (78.5%) and Hispanics (21.9%) than in the non-Hispanic White group (13.2%). The former two groups also have a higher prevalence of type 2 diabetes (African-Americans, 14.1%, and Hispanics, 11.7%) compared to non-Hispanic Whites (6.8%). Logistic regression analysis revealed significant interactions between the ENPP1 genotype, age, and body mass index within each ethnic group. After adjustment for these variables and their interactions, ENPP1 Q allele predicted diabetes when a recessive model was tested. Ethnic differences in ENPP1 121Q allele frequency may contribute to the increased susceptibility to type 2 diabetes observed in US minority groups.

Original languageEnglish (US)
Pages (from-to)143-148
Number of pages6
JournalJournal of Diabetes and Its Complications
Volume21
Issue number3
DOIs
StatePublished - May 1 2007

Keywords

  • ENPP1
  • Ethnicity
  • Insulin resistance
  • PC-1
  • Type 2 diabetes

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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