PIWIL2 suppresses pluripotency in the male mouse germline.

PIWIL2 is a key suppressor of pluripotency in the male mouse germline, and Piwil2-deficient spermatogonial stem cells aberrantly express SOX2.

• Why it matters: Germ cells resist Yamanaka-factor reprogramming, yet the mechanisms maintaining this pluripotency barrier are unclear.
• What they did: In male mice, Piwil2-deficient SSCs show SOX2 misexpression, and they readily acquire pluripotency when Dmrt1 and Trp53 are concurrently lost; piRNAs at the Sox2 locus appear in embryonic gonocytes but not SSCs.
• The result: Piwil2 loss reduces DNA methylation at the Sox2 promoter and increases DMRT1 and DAZL, which together restrict SOX2 expression, revealing PIWIL2’s role in maintaining germ cell identity.

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