{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"bioRxiv"}],"indexed":{"date-parts":[[2026,2,27]],"date-time":"2026-02-27T01:39:10Z","timestamp":1772156350740,"version":"3.50.1"},"posted":{"date-parts":[[2023,6,1]]},"group-title":"Cell Biology","reference-count":110,"publisher":"openRxiv","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2023,11,22]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                <jats:p>\n                  Meiotic sex chromosome inactivation (MSCI) is a critical feature of meiotic prophase I progression in males. While the ATR kinase and its activator TOPBP1 are key drivers of MSCI within the specialized sex body (SB) domain of the nucleus, how they promote silencing remains unclear given their multifaceted meiotic functions that also include DNA repair, chromosome synapsis and SB formation. Here we report a novel mutant mouse harboring mutations in the TOPBP1-BRCT5 domain.\n                  <jats:italic>\n                    Topbp1\n                    <jats:sup>B5\/B5<\/jats:sup>\n                  <\/jats:italic>\n                  males are infertile, with impaired MSCI despite displaying grossly normal events of early prophase I, including synapsis and SB formation. Specific ATR-dependent events are disrupted including phosphorylation and localization of the RNA:DNA helicase Senataxin.\n                  <jats:italic>\n                    Topbp1\n                    <jats:sup>B5\/B5<\/jats:sup>\n                  <\/jats:italic>\n                  spermatocytes initiate, but cannot maintain ongoing, MSCI. These findings reveal a non-canonical role for the ATR-TOPBP1 signaling axis in MSCI dynamics at advanced stages in pachynema and establish the first mouse mutant that separates ATR signaling and MSCI from SB formation.\n                <\/jats:p>","DOI":"10.1101\/2023.05.31.543071","type":"posted-content","created":{"date-parts":[[2023,6,1]],"date-time":"2023-06-01T15:35:10Z","timestamp":1685633710000},"source":"Crossref","is-referenced-by-count":1,"title":["A TOPBP1 Allele Causing Male Infertility Uncouples XY Silencing Dynamics From Sex Body Formation"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0882-7390","authenticated-orcid":false,"given":"Carolline F. 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