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The Genetic Contribution of West-African Ancestry to Protection against Central Obesity in African-American Men but Not Women: Results from the ARIC and MESA Studies.

TitleThe Genetic Contribution of West-African Ancestry to Protection against Central Obesity in African-American Men but Not Women: Results from the ARIC and MESA Studies.
Publication TypeJournal Article
Year of Publication2016
AuthorsKlimentidis YC, Arora A, Zhou J, Kittles R
Secondary AuthorsAllison DB
JournalFront Genet
Volume7
Pagination89
Date Published2016
ISSN1664-8021
Abstract

Over 80% of African-American (AA) women are overweight or obese. A large racial disparity between AA and European-Americans (EA) in obesity rates exists among women, but curiously not among men. Although socio-economic and/or cultural factors may partly account for this race-by-sex interaction, the potential involvement of genetic factors has not yet been investigated. Among 2814 self-identified AA in the Atherosclerosis Risk in Communities study, we estimated each individual's degree of West-African genetic ancestry using 3437 ancestry informative markers. We then tested whether sex modifies the association between West-African genetic ancestry and body mass index (BMI), waist-circumference (WC), and waist-to-hip ratio (WHR), adjusting for income and education levels, and examined associations of ancestry with the phenotypes separately in males and females. We replicated our findings in the Multi-Ethnic Study of Atherosclerosis (n = 1611 AA). In both studies, we find that West-African ancestry is negatively associated with obesity, especially central obesity, among AA men, but not among AA women (pinteraction = 4.14 × 10(-5) in pooled analysis of WHR). In conclusion, our results suggest that the combination of male gender and West-African genetic ancestry is associated with protection against central adiposity, and suggest that the large racial disparity that exists among women, but not men, may be at least partly attributed to genetic factors.

DOI10.3389/fgene.2016.00089
Alternate JournalFront Genet
PubMed ID27313598
PubMed Central IDPMC4888933
Grant ListUL1 RR033176 / RR / NCRR NIH HHS / United States
HHSN268201100009I / HL / NHLBI NIH HHS / United States
N01HC95160 / HL / NHLBI NIH HHS / United States
R01 HL071251 / HL / NHLBI NIH HHS / United States
HHSN268201100010C / HL / NHLBI NIH HHS / United States
R01 HL071259 / HL / NHLBI NIH HHS / United States
UL1 RR025005 / RR / NCRR NIH HHS / United States
N01HC95163 / HL / NHLBI NIH HHS / United States
HHSN268201100008C / HL / NHLBI NIH HHS / United States
HHSN268201100005G / HL / NHLBI NIH HHS / United States
HHSN268201100008I / HL / NHLBI NIH HHS / United States
HHSN268201100007C / HL / NHLBI NIH HHS / United States
N01HC95169 / HL / NHLBI NIH HHS / United States
HHSN268201100011I / HL / NHLBI NIH HHS / United States
R01 HL071250 / HL / NHLBI NIH HHS / United States
HHSN268201100011C / HL / NHLBI NIH HHS / United States
UL1 RR024156 / RR / NCRR NIH HHS / United States
U01 HG004402 / HG / NHGRI NIH HHS / United States
N01HC95164 / HL / NHLBI NIH HHS / United States
UL1 TR000124 / TR / NCATS NIH HHS / United States
N02HL64278 / HL / NHLBI NIH HHS / United States
N01HC95162 / HL / NHLBI NIH HHS / United States
N01HC95168 / HL / NHLBI NIH HHS / United States
R01 HL071051 / HL / NHLBI NIH HHS / United States
HHSN268201100005I / HL / NHLBI NIH HHS / United States
N01HC95165 / HL / NHLBI NIH HHS / United States
N01HC95159 / HL / NHLBI NIH HHS / United States
N01HC95161 / HL / NHLBI NIH HHS / United States
K01 DK106116 / DK / NIDDK NIH HHS / United States
N01HC95167 / HL / NHLBI NIH HHS / United States
HHSN268201100009C / HL / NHLBI NIH HHS / United States
HHSN268201100005C / HL / NHLBI NIH HHS / United States
R01 HL071205 / HL / NHLBI NIH HHS / United States
HHSN268201100007I / HL / NHLBI NIH HHS / United States
N01HC95166 / HL / NHLBI NIH HHS / United States
R01 HL071258 / HL / NHLBI NIH HHS / United States