Genetic test flags obesity risk decades early
Mass General Brigham rolled out a genetic test that claims to predict obesity — and by extension diabetes risk — decades before clinical onset, potentially reshaping prevention strategies. The announcement frames this as a long‑lead tool for targeted early interventions rather than a short‑term diagnostic. (parriva.com)
The study, titled “Metabolic polygenic risk scores for prediction of obesity, type 2 diabetes, and related morbidities,” was published in Cell Metabolism in March 2026 (DOI 10.1016/j.cmet.2026.02.009) with Min Seo Kim among the co‑first authors and Akl C. Fahed, Patrick T. Ellinor and Minxian Wang as senior authors. (broadinstitute.org) Investigators built a composite MetPRS by integrating multi‑ancestry genome‑wide association signals across 20 metabolic traits, using GWAS data drawn from datasets collectively representing more than 10 million participants. (cell.com) The paper reports that the obesity‑optimized (O‑MetPRS) and diabetes‑optimized (D‑MetPRS) scores outperformed existing single‑trait PRSs and showed robust prediction of obesity and type 2 diabetes across six ancestry groups in internal and external validation cohorts. (cell.com) For African‑ancestry performance the team trained an African‑optimized MetPRS on 6,842 African‑ancestry individuals from the UK Biobank and then externally validated it in All of Us and the Mass General Brigham Biobank. (sciencedirect.com) Clinical‑outcome analyses tied high MetPRS to care pathways: individuals in the top PRS decile had an approximately two‑fold higher risk of initiating GLP‑1 receptor agonist therapy compared with the middle quintile, and those with high scores were about twice as likely to undergo bariatric surgery over a median 5.5‑year follow‑up. (sciencedirect.com) Mass General Brigham highlighted the tool as a long‑lead preventive instrument and reported plans to continue validation using its health‑system linked biobank (about 140,000 enrollees) as it explores clinical implementation pathways. (massgeneralbrigham.org)
