{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,8]],"date-time":"2026-09-08T07:26:59Z","timestamp":1788852419762,"version":"build-2803163510"},"reference-count":101,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2025,3,14]],"date-time":"2025-03-14T00:00:00Z","timestamp":1741910400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"University of Campania \u201cLuigi Vanvitelli\u201d","award":["D.R. n. 111 del 9\/02\/2024"],"award-info":[{"award-number":["D.R. n. 111 del 9\/02\/2024"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>The epididymis represents a pivotal organ for sperm maturation and male fertility maintenance. During the epididymal journey, sperm cells undergo morphological and molecular changes that need to acquire the morpho-functional skills necessary for successful oocyte fertilization. Not last, a great enrichment of the spermatozoa RNA payload occurs via an epithelium-derived epididymosome transfer. Currently, circular RNAs (circRNAs), a class of non-coding RNAs (ncRNAs), are acquiring a prominent role in the setting of sperm quality parameters. In this regard, they are considered potential targets in several male infertility conditions. Despite their consolidated role, few notions are known regarding the alleged epididymal backsplicing activity. In the current review, we discuss the main aspects of spermatozoa maturation along the epididymis and the circRNA role in the field of male reproduction. We also report the most recent findings on the circRNA biogenesis that occurs in the epididymal duct, providing new fascinating evidence on epididymal-derived circRNAs. Finally, we show preliminary compelling data on epididymal backsplicing by exploiting the experimental mouse model of aging. Collectively, these data evidence a remarkable role of the epididymis in remodeling the circRNA payload and in shaping its profile in maturating spermatozoa.<\/jats:p>","DOI":"10.3390\/ijms26062614","type":"journal-article","created":{"date-parts":[[2025,3,14]],"date-time":"2025-03-14T07:02:16Z","timestamp":1741935736000},"page":"2614","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Epididymal-Born circRNA Cargo and Its Implications in Male Fertility"],"prefix":"10.3390","volume":"26","author":[{"given":"Francesco","family":"Manfrevola","sequence":"first","affiliation":[{"name":"Department of Experimental Medicine, University of Campania \u201cLuigi Vanvitelli\u201d, 80138 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0405-3807","authenticated-orcid":false,"given":"Nicola","family":"Mosca","sequence":"additional","affiliation":[{"name":"Department of Environmental, Biological and Pharmaceutical Science and Technologies, University of Campania \u201cLuigi Vanvitelli\u201d, 81100 Caserta, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vincenza Grazia","family":"Mele","sequence":"additional","affiliation":[{"name":"Department of Experimental Medicine, University of Campania \u201cLuigi Vanvitelli\u201d, 80138 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1720-1496","authenticated-orcid":false,"given":"Teresa","family":"Chioccarelli","sequence":"additional","affiliation":[{"name":"Department of Experimental Medicine, University of Campania \u201cLuigi Vanvitelli\u201d, 80138 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antonella","family":"Migliaccio","sequence":"additional","affiliation":[{"name":"Department of Experimental Medicine, University of Campania \u201cLuigi Vanvitelli\u201d, 80138 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Monica","family":"Mattia","sequence":"additional","affiliation":[{"name":"Department of Experimental Medicine, University of Campania \u201cLuigi Vanvitelli\u201d, 80138 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mariaceleste","family":"Pezzullo","sequence":"additional","affiliation":[{"name":"Department of Environmental, Biological and Pharmaceutical Science and Technologies, University of Campania \u201cLuigi Vanvitelli\u201d, 81100 Caserta, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5884-9208","authenticated-orcid":false,"given":"Gilda","family":"Cobellis","sequence":"additional","affiliation":[{"name":"Department of Experimental Medicine, University of Campania \u201cLuigi Vanvitelli\u201d, 80138 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9736-792X","authenticated-orcid":false,"given":"Nicoletta","family":"Potenza","sequence":"additional","affiliation":[{"name":"Department of Environmental, Biological and Pharmaceutical Science and Technologies, University of Campania \u201cLuigi Vanvitelli\u201d, 81100 Caserta, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3631-1794","authenticated-orcid":false,"given":"Rosanna","family":"Chianese","sequence":"additional","affiliation":[{"name":"Department of Experimental Medicine, University of Campania \u201cLuigi Vanvitelli\u201d, 80138 Naples, Italy"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,3,14]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1234","DOI":"10.21451\/1984-3143-AR955","article-title":"The epididymis and its role on sperm quality and male fertility","volume":"14","author":"Lucca","year":"2017","journal-title":"Anim. 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