BIOBRIEF
Six had never been connected to the condition before, and the multi ancestry study points to appetite, metabolism, and brain plasticity pathways as the next treatment targets.
Hyperemesis gravidarum, the most severe form of pregnancy sickness, affects about 2% of pregnancies and now has a genetic architecture researchers can actually map. A new study published in Nature Genetics analyzed 10,974 women with HG and 461,461 controls across European, Asian, African, and Latino ancestries, identifying nine new genes linked to the condition. Six had never been connected to HG before, bringing the total number of known risk genes to ten (primary paper; press release).
The newly implicated genes cluster in appetite, nausea, metabolism, insulin signaling, and brain-plasticity pathways, mechanisms that fit the lived biology of unrelenting pregnancy sickness. The work extends prior research from the same team that pinned GDF15, a hormone-producing gene, as a major contributor. Together the loci give drug hunters a broader surface than a single hormone.
HG can mean months of vomiting, hospitalization, and, in serious cases, threats to both mother and baby. For decades it was dismissed as psychological. The new map reframes HG as a biological condition with specific, druggable pathways. Lead author Marlena Fejzo, a clinical assistant professor at USC's Center for Genetic Epidemiology, said in the press release that the findings tease out details that were previously unknown.
Treatment translation remains prospective: identifying risk loci is a foundation, not a cure. The next concrete test is whether drugs already in trials for the GDF15 axis help the broader genetic slice of patients.