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Race, vitamin D-binding protein gene polymorphisms, 25-hydroxyvitamin D, and incident diabetes: the Atherosclerosis Risk in Communities (ARIC) Study.

TitleRace, vitamin D-binding protein gene polymorphisms, 25-hydroxyvitamin D, and incident diabetes: the Atherosclerosis Risk in Communities (ARIC) Study.
Publication TypeJournal Article
Year of Publication2015
AuthorsReis JP, Michos ED, Selvin E, Pankow JS
Secondary AuthorsLutsey PL
JournalAm J Clin Nutr
Volume101
Issue6
Pagination1232-40
Date Published2015 Jun
ISSN1938-3207
KeywordsAfrican Continental Ancestry Group, Aged, Atherosclerosis, Biological Availability, Blood Glucose, Body Height, Body Mass Index, Body Weight, Cholesterol, Creatinine, Diabetes Mellitus, Type 2, European Continental Ancestry Group, Female, Follow-Up Studies, Humans, Incidence, Male, Middle Aged, Polymorphism, Single Nucleotide, Prospective Studies, Risk Factors, Triglycerides, Vitamin D, Vitamin D-Binding Protein
Abstract

BACKGROUND: Low 25-hydroxyvitamin D [25(OH)D] is associated with diabetes, but few studies have examined racially diverse populations while also accounting for key vitamin D-binding protein (DBP) gene polymorphisms.

OBJECTIVE: We sought to evaluate whether the association between 25(OH)D and incident diabetes varied by race and important DBP single nucleotide polymorphisms (SNPs).

DESIGN: We studied 10,222 adults (8120 whites, 2102 blacks) aged 46-70 y at baseline (1990-1992) from the ARIC (Atherosclerosis Risk in Communities) Study with follow-up for incident diabetes ascertained during study visits conducted in 1993-1995 and 1996-1998. Adjusted HRs and their 95% CIs for diabetes were estimated according to 25(OH)D status.

RESULTS: During follow-up there were 750 incident cases of diabetes. The association of 25(OH)D with diabetes varied by race (P-interaction = 0.004). Among whites, the adjusted HR for diabetes corresponding to each additional SD higher 25(OH)D concentration (21.3 nmol/L) was 0.95 (95% CI: 0.91, 0.99). No significant association was observed among blacks (HR: 1.06; 95% CI: 0.99, 1.14). There was evidence that the A allele at rs4588 and the T allele at rs7041, which are reported to be associated with high and low DBP concentrations, respectively, modified the association between 25(OH)D and diabetes among whites (P-interaction 0.50 for both).

CONCLUSIONS: In this large, community-based study, low 25(OH)D concentrations were associated with diabetes among whites but not blacks. Interactions by key DBP SNPs varied between genotypes associated with either high or low DBP concentrations among whites but not blacks. Nevertheless, the findings from this prospective study suggest that there are important differences in the association of 25(OH)D with incident diabetes between white and black adults.

DOI10.3945/ajcn.115.107334
Alternate JournalAm J Clin Nutr
PubMed ID25926504
PubMed Central IDPMC4441813
Grant ListR01 HL103706 / HL / NHLBI NIH HHS / United States
R01 DK089174 / DK / NIDDK NIH HHS / United States
HHSN268201100005C / / PHS HHS / United States
R01 NS072243 / NS / NINDS NIH HHS / United States
HHSN268201100009C / / PHS HHS / United States
HHSN268201100010C / / PHS HHS / United States
HHSN268201100008C / / PHS HHS / United States
HHSN268201100012C / / PHS HHS / United States
HHSN268201100007C / / PHS HHS / United States
HHSN268201100011C / / PHS HHS / United States
HHSN268201100006C / / PHS HHS / United States