Pregnancy-Associated Bleeding and Genetics: Five Sequence Variants in the Myometrium and Progesterone Signaling Pathway are associated with postpartum hemorrhage
Westergaard, D.; Steinthorsdottir, V.; Stefansdottir, L.; Rohde, P. D.; Wu, X.; Geller, F.; Tyrmi, J.; Havulinna, A. S.; Navais, P. S.; Flatley, C.; Ostrowski, S. R.; Pedersen, O. B.; Erikstrup, C.; Soerensen, E.; Mikkelsen, C.; Brun, M. T.; Jensen, B. A.; Brodersen, T.; Ullum, H.; FinnGen, ; Danish Blood Donor Study Genomic Consortium, ; Estonian Biobank Research Team, ; Nordic Collaboration for Womens and Reproductive Health, ; Magnus, P.; Andreassen, O. A.; Njolstad, P. R.; Kolte, A. M.; Krebs, L.; Nyegaard, M.; Hansen, T. F.; Fenstra, B.; Daly, M.; Lindgren, C. M.; Thorleifsson, G.; St
Show abstract
Bleeding in early pregnancy and postpartum hemorrhage (PPH) bear substantial risks, with the former closely associated with pregnancy loss and the latter being the foremost cause of maternal death, underscoring the severity of these complications in maternal-fetal health. Here, we investigated the genetic variation underlying aspects of pregnancy-associated bleeding and identified five loci associated with PPH through a meta-analysis of 21,512 cases and 259,500 controls. Functional annotation analysis indicated candidate genes, HAND2, TBX3, and RAP2C/FRMD7, at three loci and showed that at each locus, associated variants were located within binding sites for progesterone receptors (PGR). Furthermore, there were strong genetic correlations with birth weight, gestational duration, and uterine fibroids. Early bleeding during pregnancy (28,898 cases and 302,894 controls) yielded no genome-wide association signals, but showed strong genetic correlation with a variety of human traits, indicative of polygenic and pleiotropic effects. Our results suggest that postpartum bleeding is related to myometrium dysregulation, whereas early bleeding is a complex trait related to underlying health and possibly socioeconomic status.
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