Yann C Klimentidis1, Zhao Chen, Amit Arora, Chiu-Hsieh Hsu. 1. Mel and Enid Zuckerman College of Public Health, Division of Epidemiology and Biostatistics, University of Arizona, 1295 N. Martin, Tucson, AZ, 85724, USA, yann@email.arizona.edu.
Abstract
AIMS/HYPOTHESIS: We examined whether or not the association of physical activity with type 2 diabetes incidence differs according to several types of genetic susceptibility. METHODS: In a large prospective cohort with 821 incident cases of type 2 diabetes, we examined interactions of physical activity with: (1) each of 65 type 2 diabetes-associated single nucleotide polymorphisms (SNPs); (2) a genetic risk score (GRS) comprising all 65 SNPs; (3) two GRSs comprised of SNPs implicated in insulin resistance (IR) and insulin secretion; (4) GRSs for fasting insulin (FI) and fasting glucose. RESULTS: We found a significant interaction of physical activity and the type 2 diabetes GRS (p interaction = 0.016), suggesting a weaker protective effect of physical activity in those at high genetic risk. Based on the interactions observed with the IR GRS (p interaction = 0.046) and the FI GRS (p interaction = 0.042), it appears that the overall type 2 diabetes GRS interaction most likely occurs through genetic susceptibility to IR as opposed to insulin secretion. Furthermore, this interaction was more pronounced in women (p interaction = 0.0025) than in men (p interaction = 0.46). No single SNP stood out as displaying a strong interaction with physical activity. CONCLUSIONS/ INTERPRETATION: We conclude that although physical activity appears to have an overall protective effect on type 2 diabetes, this putative effect is weakest among individuals with high genetic risk for type 2 diabetes and IR.
AIMS/HYPOTHESIS: We examined whether or not the association of physical activity with type 2 diabetes incidence differs according to several types of genetic susceptibility. METHODS: In a large prospective cohort with 821 incident cases of type 2 diabetes, we examined interactions of physical activity with: (1) each of 65 type 2 diabetes-associated single nucleotide polymorphisms (SNPs); (2) a genetic risk score (GRS) comprising all 65 SNPs; (3) two GRSs comprised of SNPs implicated in insulin resistance (IR) and insulin secretion; (4) GRSs for fasting insulin (FI) and fasting glucose. RESULTS: We found a significant interaction of physical activity and the type 2 diabetes GRS (p interaction = 0.016), suggesting a weaker protective effect of physical activity in those at high genetic risk. Based on the interactions observed with the IR GRS (p interaction = 0.046) and the FI GRS (p interaction = 0.042), it appears that the overall type 2 diabetes GRS interaction most likely occurs through genetic susceptibility to IR as opposed to insulin secretion. Furthermore, this interaction was more pronounced in women (p interaction = 0.0025) than in men (p interaction = 0.46). No single SNP stood out as displaying a strong interaction with physical activity. CONCLUSIONS/ INTERPRETATION: We conclude that although physical activity appears to have an overall protective effect on type 2 diabetes, this putative effect is weakest among individuals with high genetic risk for type 2 diabetes and IR.
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