Genome-wide association meta-analysis identifies five loci associated with postpartum hemorrhage

Area of Science:

• Genetics and Obstetrics
• Reproductive Health Research

Background:

• Bleeding in early pregnancy and postpartum hemorrhage (PPH) pose significant risks to maternal-fetal health.
• PPH is the leading cause of maternal mortality globally.
• Early pregnancy bleeding is associated with pregnancy loss.

Purpose of the Study:

• To investigate the genetic underpinnings of PPH and early pregnancy bleeding.
• To identify genetic loci and candidate genes associated with PPH.
• To explore genetic correlations between these bleeding conditions and other traits.

Main Methods:

• A meta-analysis was conducted to identify genetic loci linked to PPH.
• Functional annotation analysis was performed on candidate genes.
• Genetic correlations with traits like birth weight and gestational duration were assessed.

Main Results:

• Five genetic loci were associated with PPH, with candidate genes HAND2, TBX3, and RAP2C/FRMD7 identified.
• Associated variants for PPH were located within progesterone receptor binding sites.
• Early pregnancy bleeding showed no genome-wide association signals but strong genetic correlations with various traits, suggesting a polygenic basis.

Conclusions:

• PPH is potentially linked to progesterone signaling dysregulation.
• Early pregnancy bleeding is a complex trait influenced by multiple factors, including potential unidentified genetic elements.
• Findings highlight distinct genetic etiologies for PPH and early pregnancy bleeding.