Cornell study uses JQ1 to halt mouse sperm production
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- Cornell University scientists used the small‑molecule inhibitor JQ1 to halt meiosis in male mice, stopping sperm production.
- JQ1 was given for three weeks, causing a complete cessation of sperm output, and normal meiotic activity resumed within six weeks after treatment stopped.
- Paula Cohen, professor of genetics and director of the Cornell Reproductive Sciences Center, noted the method spares spermatogonial stem cells and yields normal offspring.
- The study was published on April 7 2026 in the Proceedings of the National Academy of Sciences, showing treated mice regained fertility and sired healthy pups that reproduced.
- Future male contraceptives could be administered as a quarterly injection or a patch, according to the researchers.
Why it matters: The finding offers men a potential reversible, non‑hormonal birth‑control method, expanding beyond condoms and vasectomies. By temporarily halting meiosis without damaging stem cells, the approach demonstrates a safe, reversible mechanism that could be delivered as a quarterly injection or patch, giving men a novel, long‑acting contraceptive alternative.
