title: Genetic variants associated with gestational diabetes mellitus: a meta-analysis and subgroup analysis.
abstract: Previous studies have demonstrated that gestational diabetes mellitus (GDM) and Type 2 diabetes mellitus (T2D) share common genetic polymorphisms. We conducted meta-analysis and subgroup analysis of all available variants and determined the effects of confounding and experimental components on the genetic association of GDM. Any case-controlled or cohort studies with genotype distribution compared GDM cases with controls were included. In total, 28 articles including 8,204 cases and 15,221 controls for 6 polymorphisms were studied. rs10830963(MTNR1B), rs7903146(TCF7L2), and rs1801278(IRS1) were significantly associated with the increased GDM risk. The association of rs4402960(IGF2BP2) and rs1800629(TNF-α) was significant only when the studies with control allele frequency deviation and publication bias were excluded. Further subgroup analysis showed the risk alleles of rs7903146(TCF7L2) and rs1801282(PPARG) were significantly associated with the GDM risk only in Asian, but not in Caucasian population. The OGTT test using 100 g, but not 75 g; and genotype detection by other assays, but not Taqman method, were also significantly associated with increased GDM risk in rs1801278(IRS1) and rs7903146(TCF7L2). Overall GDM was associated with rs10830963(MTNR1B), rs7903146(TCF7L2), and rs1801278(IRS1), but only rs7903146(TCF7L2) and rs1801282(PPARG) were significant in Asian populations. While rs1801278(IRS1) and rs7903146(TCF7L2) were significantly affected by OGTT protocol and genotyping methods.
authors.affiliation: Department of Obstetrics &Gynaecology, The Chinese University of Hong Kong, Hong Kong.
authors.forename: Ling
authors.initials: L
authors.lastname: Wu
authors.affiliation: Department of Obstetrics &Gynaecology, The Chinese University of Hong Kong, Hong Kong.
authors.forename: Long
authors.initials: L
authors.lastname: Cui
authors.affiliation: Department of Obstetrics &Gynaecology, The Chinese University of Hong Kong, Hong Kong.
authors.forename: Wing Hung
authors.initials: WH
authors.lastname: Tam
authors.affiliation: Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong.|Hong Kong Institute of Diabetes and Obesity, The Chinese University of Hong Kong, Hong Kong.|Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Hong Kong.
authors.forename: Ronald C W
authors.initials: RC
authors.lastname: Ma
authors.affiliation: Department of Obstetrics &Gynaecology, The Chinese University of Hong Kong, Hong Kong.|Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Hong Kong.|School of Biomedical Sciences, The Chinese University of Hong Kong, Hong Kong.
authors.forename: Chi Chiu
authors.initials: CC
authors.lastname: Wang
mesh_terms: D000483:Alleles; D044466:Asian People; D003924:Diabetes Mellitus, Type 2 / Q000235:genetics*; D016640:Diabetes, Gestational / Q000235:genetics*; D005260:Female; D006801:Humans; D008297:Male; D011110:Polymorphism, Genetic; D011247:Pregnancy; D012307:Risk Factors