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Here, we profiled single-cell transcriptomes and charted a developmental trajectory going from germline stem cells, through early, committed, and late progenitors, to premeiotic and meiotic cells. We showed that the transcription factor Foxl2l was expressed in the progenitor, directing progenitor differentiation toward oocytes. CRISPR-Cas9-mediated mutation of\n                    <jats:italic>foxl2l<\/jats:italic>\n                    produced 100% male fish with normal fertility. Another single-cell profiling of\n                    <jats:italic>\n                      foxl2l\n                      <jats:sup>-\/-<\/jats:sup>\n                    <\/jats:italic>\n                    germ cells revealed the arrest of germ cell development at the stage of progenitor commitment. Concomitantly,\n                    <jats:italic>nanos2<\/jats:italic>\n                    transcript (germline stem cell marker) was elevated together with an increase of\n                    <jats:italic>\n                      nanos2\n                      <jats:sup>+<\/jats:sup>\n                    <\/jats:italic>\n                    germ cells in\n                    <jats:italic>foxl2l<\/jats:italic>\n                    mutants, indicating the acquisition of a novel stem cell state. Thus, we have identified developmental stages of germ cells in juvenile zebrafish and demonstrated that zebrafish Foxl2l drives progenitor germ cells toward feminization and prevents them from expressing\n                    <jats:italic>nanos2<\/jats:italic>\n                    .\n                  <\/jats:p>","DOI":"10.7554\/elife.100204","type":"journal-article","created":{"date-parts":[[2025,6,11]],"date-time":"2025-06-11T03:15:07Z","timestamp":1749611707000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.100204","source":"Crossref","is-referenced-by-count":9,"title":["Single-cell transcriptomes of zebrafish germline reveal progenitor types and feminization by Foxl2l"],"prefix":"10.7554","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-8845-7920","authenticated-orcid":true,"given":"Chen-wei","family":"Hsu","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/05wcstg80","id-type":"ROR","asserted-by":"publisher"}],"name":"National Center for 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