{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,4]],"date-time":"2026-08-04T04:18:31Z","timestamp":1785817111596,"version":"3.56.0"},"reference-count":198,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2024,4,28]],"date-time":"2024-04-28T00:00:00Z","timestamp":1714262400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Basic Science Research Program of Nantong","award":["JC22022086"],"award-info":[{"award-number":["JC22022086"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Biomolecules"],"abstract":"<jats:p>The spatiotemporal expression patterns of genes are crucial for maintaining normal physiological functions in animals. Conditional gene knockout using the cyclization recombination enzyme (Cre)\/locus of crossover of P1 (Cre\/LoxP) strategy has been extensively employed for functional assays at specific tissue or developmental stages. This approach aids in uncovering the associations between phenotypes and gene regulation while minimizing interference among distinct tissues. Various Cre-engineered mouse models have been utilized in the male reproductive system, including Dppa3-MERCre for primordial germ cells, Ddx4-Cre and Stra8-Cre for spermatogonia, Prm1-Cre and Acrv1-iCre for haploid spermatids, Cyp17a1-iCre for the Leydig cell, Sox9-Cre for the Sertoli cell, and Lcn5\/8\/9-Cre for differentiated segments of the epididymis. Notably, the specificity and functioning stage of Cre recombinases vary, and the efficiency of recombination driven by Cre depends on endogenous promoters with different sequences as well as the constructed Cre vectors, even when controlled by an identical promoter. Cre mouse models generated via traditional recombination or CRISPR\/Cas9 also exhibit distinct knockout properties. This review focuses on Cre-engineered mouse models applied to the male reproductive system, including Cre-targeting strategies, mouse model screening, and practical challenges encountered, particularly with novel mouse strains over the past decade. It aims to provide valuable references for studies conducted on the male reproductive system.<\/jats:p>","DOI":"10.3390\/biom14050529","type":"journal-article","created":{"date-parts":[[2024,5,1]],"date-time":"2024-05-01T08:59:39Z","timestamp":1714553979000},"page":"529","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Unlocking Genetic Mysteries during the Epic Sperm Journey toward Fertilization: Further Expanding Cre Mouse Lines"],"prefix":"10.3390","volume":"14","author":[{"given":"Pengyuan","family":"Dai","sequence":"first","affiliation":[{"name":"Institute of Reproductive Medicine, Medical School, Nantong University, Nantong 226001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chaoye","family":"Ma","sequence":"additional","affiliation":[{"name":"Institute of Reproductive Medicine, Medical School, Nantong University, Nantong 226001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chen","family":"Chen","sequence":"additional","affiliation":[{"name":"Institute of Reproductive Medicine, Medical School, Nantong University, Nantong 226001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Min","family":"Liang","sequence":"additional","affiliation":[{"name":"Institute of Reproductive Medicine, Medical School, Nantong University, Nantong 226001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shijue","family":"Dong","sequence":"additional","affiliation":[{"name":"Institute of Reproductive Medicine, Medical School, Nantong University, Nantong 226001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8319-8101","authenticated-orcid":false,"given":"Hao","family":"Chen","sequence":"additional","affiliation":[{"name":"Institute of Reproductive Medicine, Medical School, Nantong University, Nantong 226001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1227-866X","authenticated-orcid":false,"given":"Xiaoning","family":"Zhang","sequence":"additional","affiliation":[{"name":"Institute of Reproductive Medicine, Medical School, Nantong University, Nantong 226001, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,4,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"e37","DOI":"10.1093\/nar\/gks1037","article-title":"Vika\/vox, a novel efficient and specific Cre\/loxP-like site-specific recombination system","volume":"41","author":"Karimova","year":"2013","journal-title":"Nucleic Acids Res."},{"key":"ref_2","first-page":"14453","article-title":"A single reporter mouse line for Vika, Flp, Dre, and Cre-recombination","volume":"8","author":"Karimova","year":"2018","journal-title":"Mater. 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