Genetic determinants for gestational diabetes mellitus and related metabolic traits in Mexican women

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Abstract

Epidemiological and physiological similarities among Gestational Diabetes Mellitus (GDM) and Type 2 Diabetes (T2D) suggest that both diseases, share a common genetic background. T2D risk variants have been associated to GDM susceptibility. However, the genetic architecture of GDM is not yet completely understood. We analyzed 176 SNPs for 115 loci previously associated to T2D, GDM and body mass index (BMI), as well as a set of 118 Ancestry Informative Markers (AIMs), in 750 pregnant Mexican women. Association with GDM was found for two of the most frequently replicated T2D loci:aTCF7L2 haplotype (CTTC: rs7901695, rs4506565, rs7903146, rs12243326; P=2.16×10 -06; OR=2.95) and a KCNQ1 haplotype (TTT: rs2237892, rs163184, rs2237897; P=1.98×10 -05; OR=0.55). In addition, we found two loci associated to glycemic traits: CENTD2 (60′ OGTT glycemia: rs1552224, P=0.03727) and MTNR1B (HOMA B: rs1387153, P=0.05358). Remarkably, a major susceptibility SLC16A11 locus for T2D in Mexicans was not shown to play a role in GDM risk. The fact that two of the main T2D associated loci also contribute to the risk of developing GDM in Mexicans, confirm that both diseases share a common genetic background. However, lack of association with a Native American contribution T2D risk haplotype, SLC16A11, suggests that other genetic mechanisms may be in play for GDM.

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Huerta-Chagoya, A., Vázquez-Cárdenas, P., Moreno-Macías, H., Tapia-Maruri, L., Rodríguez-Guillén, R., López-Vite, E., … Tusié-Luna, T. (2015). Genetic determinants for gestational diabetes mellitus and related metabolic traits in Mexican women. PLoS ONE, 10(5). https://doi.org/10.1371/journal.pone.0126408

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