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01.09.2014 | Article

Association of African genetic ancestry with fasting glucose and HbA_1c levels in non-diabetic individuals: the Boston Area Community Health (BACH) Prediabetes Study

verfasst von: James B. Meigs, Richard W. Grant, Rebecca Piccolo, Lenny López, Jose C. Florez, Bianca Porneala, Lisa Marceau, John B. McKinlay

Erschienen in: Diabetologia | Ausgabe 9/2014

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Abstract

Aims/hypothesis

To test among diabetes-free urban community-dwelling adults the hypothesis that the proportion of African genetic ancestry is positively associated with glycaemia, after accounting for other continental ancestry proportions, BMI and socioeconomic status (SES).

Methods

The Boston Area Community Health cohort is a multi-stage 1:1:1 stratified random sample of self-identified African-American, Hispanic and white adults from three Boston inner city areas. We measured 62 ancestry informative markers, fasting glucose (FG), HbA_1c, BMI and SES (income, education, occupation and insurance status) and analysed 1,387 eligible individuals (379 African-American, 411 Hispanic, 597 white) without clinical or biochemical evidence of diabetes. We used three-heritage multinomial linear regression models to test the association of FG or HbA_1c with genetic ancestry proportion adjusted for: (1) age and sex; (2) age, sex and BMI; and (3) age, sex, BMI and SES.

Results

Mean age- and sex-adjusted FG levels were 5.73 and 5.54 mmol/l among those with 100% African or European ancestry, respectively. Using per cent European ancestry as the referent, each 1% increase in African ancestry proportion was associated with an age- and sex-adjusted FG increase of 0.0019 mmol/l (p = 0.01). In the BMI- and SES-adjusted model the slope was 0.0019 (p = 0.02). Analysis of HbA_1c gave similar results.

Conclusions/interpretation

A greater proportion of African genetic ancestry is independently associated with higher FG levels in a non-diabetic community-based cohort, even accounting for other ancestry proportions, obesity and SES. The results suggest that differences between African-Americans and whites in type 2 diabetes risk may include genetically mediated differences in glucose homeostasis.

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Titel: Association of African genetic ancestry with fasting glucose and HbA1c levels in non-diabetic individuals: the Boston Area Community Health (BACH) Prediabetes Study
verfasst von: James B. Meigs
Richard W. Grant
Rebecca Piccolo
Lenny López
Jose C. Florez
Bianca Porneala
Lisa Marceau
John B. McKinlay
Publikationsdatum: 01.09.2014
Verlag: Springer Berlin Heidelberg
Erschienen in: Diabetologia / Ausgabe 9/2014
Print ISSN: 0012-186X
Elektronische ISSN: 1432-0428
DOI: https://doi.org/10.1007/s00125-014-3301-1

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Association of African genetic ancestry with fasting glucose and HbA_1c levels in non-diabetic individuals: the Boston Area Community Health (BACH) Prediabetes Study

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Aims/hypothesis

Methods

Results

Conclusions/interpretation

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Abstract

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