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CatSper is essential for fertilization and it is subjected to a complex regulation that is not fully understood. Here, we report that similar to CatSper, Cdc42 distribution in the principal piece is confined to four linear domains and this localization is disrupted in CatSper1\u2010null sperm. Cdc42 inhibition impaired CatSper activity and other Ca\n                    <jats:sup>2+<\/jats:sup>\n                    \u2010dependent downstream events resulting in a severe compromise of the sperm fertilizing potential. We also demonstrate that Cdc42 is essential for CatSper function by modulating cAMP production by soluble adenylate cyclase (sAC), providing a new regulatory mechanism for the stimulation of CatSper by the cAMP\u2010dependent pathway. These results reveal a broad mechanistic insight into the regulation of Ca\n                    <jats:sup>2+<\/jats:sup>\n                    in mammalian sperm, a matter of critical importance in male infertility as well as in contraception.\n                  <\/jats:p>","DOI":"10.1096\/fj.202002773rr","type":"journal-article","created":{"date-parts":[[2021,7,5]],"date-time":"2021-07-05T14:05:11Z","timestamp":1625493911000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Cdc42 localized in the CatSper signaling complex regulates cAMP\u2010dependent pathways in mouse sperm"],"prefix":"10.1096","volume":"35","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2745-8236","authenticated-orcid":false,"given":"Guillermina M.","family":"Luque","sequence":"first","affiliation":[{"name":"Instituto de Biolog\u00eda y Medicina Experimental (IBYME\u2010CONICET) Ciudad Aut\u00f3noma de Buenos Aires 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