rs6259

This case-control study investigated the association of SHBG polymorphisms with polycystic ovary syndrome (PCOS) and IVF-ET outcomes in 261 PCOS patients and 217 controls. SHBG rs6259 GA+AA genotypes showed significantly reduced SHBG protein levels (P<0.05) and were associated with increased PCOS risk (OR=1.734, 95% CI: 1.200-2.505). The rs6259 A allele was a risk factor for PCOS (OR=1.600, 95% CI: 1.184-2.162, P=0.002). rs6259 GA+AA carriers had lower retrieved oocyte and embryo numbers, reduced fertility rates, and elevated abortion rates and OHSS incidence compared to GG carriers.

This comprehensive review synthesizes literature on gestational diabetes mellitus (GDM), demonstrating its complex multifactorial etiology involving genetic factors (SNPs in GCKR, KCNQ1, MTNR1B, TCF7L2), epigenetic modifications (DNA methylation and microRNA expression), and alterations in microbial composition across multiple body sites. While certain SNP variants are associated with GDM phenotypes globally, genetic predisposition alone does not explain disease development; lifestyle factors can modify epigenetic signatures and microbiota composition to modulate risk. Evidence indicates genes, epigenetic alterations, and microbiota can transfer from mother to offspring with long-term health consequences.