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Cornell Study Reversibly Halts Mouse Sperm, Eyes Human Patch

5/8/2026

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Summary

Story summary

Cornell researchers halted mouse sperm production by temporarily disrupting meiotic prophase I with JQ1.
A three-week meiotic interruption caused reversible loss of sperm, with fertility restored within six weeks.
After treatment stopped, the mice sired healthy offspring that could reproduce.
Researchers suggest a human version delivered via quarterly injection or patch, avoiding hormones and preserving spermatogonial stem cells.

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Story summary

Cornell researchers halted mouse sperm production by temporarily disrupting meiotic prophase I with JQ1.
A three-week meiotic interruption caused reversible loss of sperm, with fertility restored within six weeks.
After treatment stopped, the mice sired healthy offspring that could reproduce.
Researchers suggest a human version delivered via quarterly injection or patch, avoiding hormones and preserving spermatogonial stem cells.