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While a multitude of reproductive tract\u2010specific genes required for male fertility have been identified, OVCH2 is thus far the first protein required for male fertility that contains Complement C1r\/C1s, Uegf, Bmp1 (CUB) domains located in tandem in the C\u2010terminus of the protein. Identifying the functional significance of this unique domain has implications in better understanding fertility and infertility and as a potential contraceptive target.<\/jats:p><\/jats:sec>Objective<\/jats:title>The goals of these studies were to understand the influence and requirement of OVCH2 CUB domains in the localization and functional requirement of OVCH2 in sperm maturation and function.<\/jats:p><\/jats:sec>Materials and methods<\/jats:title>To this end, we performed in vivo localization analysis of OVCH2 and reproductive phenotype analysis of mice containing C\u2010terminal FLAG tag on OVCH2, with either the entire protein intact, or CUB2 or both CUB1 and CUB2 genetically ablated. All mice were generated through the CRISPR\/Cas9 gene editing approach.<\/jats:p><\/jats:sec>Results<\/jats:title>We found that OVCH2 is specifically expressed in the proximal caput epididymidis, and the absence of CUB2 did not affect this localization pattern. Although the absence of both CUB domains significantly reduced sperm motility and progressive motility, this effect was not manifested in a reduction in fertility over a 6\u2010month period mating trial, which showed no significant differences between control and CUB deletant mice. Further, the absence of one or both CUB domains did not affect reproductive organ structure or sperm morphology.<\/jats:p><\/jats:sec>Conclusions<\/jats:title>Our studies demonstrate that the CUB domains are not required for fertility in male mice, at least under the normal animal housing conditions our mice were tested in, and suggest that the enzymatic activity of the OVCH2 protease, in the absence of its CUB domains, is sufficient for normal sperm processing in the epididymis. Although our findings do not preclude the possibility that OVCH2 CUB domains are required under a yet\u2010identified stress condition, our findings demonstrate that the most likely region for deleterious mutations in men with idiopathic infertility and the most vulnerable site for inhibition of OVCH2 protein function is in its protease domain, and not its CUB domains. Our findings have implications in the genetic screening of infertile men and the development of a novel non\u2010hormonal male contraceptive by honing in on the more critical region of a functionally required protein.<\/jats:p><\/jats:sec>","DOI":"10.1111\/andr.13508","type":"journal-article","created":{"date-parts":[[2023,8,8]],"date-time":"2023-08-08T11:24:33Z","timestamp":1691493873000},"page":"682-697","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["CUB domains are not required for OVCH2 function in sperm maturation in the mouse epididymis"],"prefix":"10.1111","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4528-3425","authenticated-orcid":false,"given":"Katarzyna","family":"Kent","sequence":"first","affiliation":[{"name":"Center for Drug Discovery Baylor College of Medicine Houston Texas USA"},{"name":"Department of Pathology & Immunology Baylor College of Medicine Houston Texas 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