{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,6]],"date-time":"2026-03-06T22:43:47Z","timestamp":1772837027732,"version":"3.50.1"},"reference-count":62,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2024,8,26]],"date-time":"2024-08-26T00:00:00Z","timestamp":1724630400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Genet."],"abstract":"<jats:p>The sex determination system of largemouth bass (<jats:italic>Micropterus salmoides<\/jats:italic>, LMB) is XX\/XY; however, the underlying molecular mechanisms involved in early sex differentiation, gonadal development, and exogenous hormone-induced sex reversal remain unknown. In this study, LMB at 15\u00a0days post-hatching (dph) were fed diets containing 20\u00a0mg\/kg of 17\u03b1-methyltestosterone (17\u03b1-MT) or 30\u00a0mg\/kg of 17\u03b2-estradiol (17\u03b2-E<jats:sub>2<\/jats:sub>) for 60\u00a0days, respectively. Serum steroid levels, histological observations of the gonads, and identification of sex-specific markers were employed to screen the gonads of 60-day-old normal female fish (XX-F), normal male fish (XY-M), 17\u03b2-E<jats:sub>2<\/jats:sub> induced pseudo-female fish (XY-F), and 17\u03b1-MT-induced pseudo-male fish (XX-M) for transcriptome sequencing in order to uncover genes and pathway involved in the process of sexual reversal. The results from histology and serum sex steroid hormone analysis showed that both 17\u03b1-MT and 17\u03b2-E2 were capable of inducing sex reversal of LMB at 15\u00a0dph. Transcriptome results revealed a total of 2,753 genes exhibiting differential expression, and the expression pattern of these genes in the gonads of XX-M or XY-F resembled that of normal females or males. The male sex-biased genes that are upregulated in XX-M and downregulated in XY-F are referred to as key genes for male reversal, while the female sex-biased genes that are upregulated in XY-F and downregulated in XX-M are referred to as key genes for female reversal. Finally, 12 differentially expressed genes (DEGs) related to male sex reversal were screened, including <jats:italic>star2<\/jats:italic>, <jats:italic>cyp17a<\/jats:italic>, <jats:italic>cyp11b1<\/jats:italic>, <jats:italic>dmrt1<\/jats:italic>, <jats:italic>amh<\/jats:italic>, <jats:italic>sox9a<\/jats:italic>, <jats:italic>katnal1<\/jats:italic>, <jats:italic>spata4<\/jats:italic>, <jats:italic>spata6l<\/jats:italic>, <jats:italic>spata7<\/jats:italic>, <jats:italic>spata18<\/jats:italic> and <jats:italic>foxl3<\/jats:italic>. 2 DEGs (<jats:italic>foxl2a<\/jats:italic> and <jats:italic>cyp19a1b<\/jats:italic>) were found to be associated with female sex reversal. The changes in these genes collectively influence the direction of sex differentiation of LMB. Among them, <jats:italic>star2<\/jats:italic>, <jats:italic>dmrt1<\/jats:italic> and <jats:italic>cyp19a1b<\/jats:italic> with significantly altered expression levels may play potentially crucial role in the process of gender reversal. The expression patterns of 21 randomly selected genes were verified using qRT-PCR which confirmed the reliability and accuracy of the RNA-seq results. These findings not only enhance our understanding of the molecular basis underlying sex reversal but also provide crucial data support for future breeding research on unisexual LMB.<\/jats:p>","DOI":"10.3389\/fgene.2024.1459427","type":"journal-article","created":{"date-parts":[[2024,8,26]],"date-time":"2024-08-26T05:05:41Z","timestamp":1724648741000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Transcriptome analysis of four types of gonadal tissues in largemouth bass (Micropterus salmoides) to reveal its sex-related genes"],"prefix":"10.3389","volume":"15","author":[{"given":"Dongyun","family":"Zhang","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Taihang","family":"Tian","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shengjie","family":"Li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jinxing","family":"Du","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Caixia","family":"Lei","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tao","family":"Zhu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Linqiang","family":"Han","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hongmei","family":"Song","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1965","published-online":{"date-parts":[[2024,8,26]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"19","DOI":"10.1007\/s00441-022-03707-9","article-title":"Sex steroid hormone synthesis, metabolism, and the effects on the mammalian olfactory system","volume":"391","author":"Abaffy","year":"2023","journal-title":"Cell. 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