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Genome-Wide Identification, Sequence Alignment, and Transcription of Five Sex-Related Genes in Largemouth Bass (Micropterus Salmoides)

生物 微翅目 鲈鱼(鱼) 基因 遗传学 基因组 性别分化 转录组 基因表达 渔业
作者
Xin-Hui Zhang,Zhiqiang Ruan,Chengfei Sun,Cancan Hu,Yu Huang,Xinxin You,Xinwen Wang,Junmin Xu,Huan Liu,Xin Liu,Xing Ye,Qiong Shi
出处
期刊:Frontiers in bioscience [Bioscience Research Institute Pte. Ltd.]
卷期号:29 (2): 63-63 被引量:2
标识
DOI:10.31083/j.fbl2902063
摘要

Background: Largemouth bass (Micropterus Salmoides) is an economically important fish species in China. Most research has focused on its growth, disease resistance, and nutrition improvement. However, the sex-determining genes in largemouth bass are still unclear. The transforming growth factor-beta (TGF-β) gene family, including amh, amhr2 and gsdf, plays an important role in the sex determination and differentiation of various fishes. These genes are potentially involved in sex determination in largemouth bass. Methods: We performed a systematic analysis of 5 sex-related genes (amh, amhr2, gsdf, cyp19a1, foxl2) in largemouth bass using sequence alignment, collinearity analysis, transcriptome, and quantitative real-time polymerase chain reaction (qRT-PCR). This included a detailed assessment of their sequences, gene structures, evolutionary traits, and gene transcription patterns in various tissues including gonads, and at different developmental stages. Results: Comparative genomics revealed that the 5 sex-related genes were highly conserved in various fish genomes. These genes did not replicate, mutate or lose in largemouth bass. However, some were duplicated (amh, amhr2 and gsdf), mutated (gsdf) or lost (amhr2) in other fishes. Some genes (e.g., gsdf) showed significant differences in genomic sequence between males and females, which may contribute to sex determination and sex differentiation in these fishes. qRT-PCR was applied to quantify transcription profiling of the 5 genes during gonadal development and in the adult largemouth bass. Interestingly, amh, amhr2 and gsdf were predominantly expressed in the testis, while cyp19a1 and foxl2 were mainly transcribed in the ovary. All 5 sex-related genes were differentially expressed in the testes and ovaries from the 56th day post-fertilization (dpf). We therefore speculate that male/female differentiation in the largemouth bass may begin at this critical time-point. Examination of the transcriptome data also allowed us to screen out several more sex-related candidate genes. Conclusions: Our results provide a valuable genetic resource for investigating the physiological functions of these 5 sex-related genes in sex determination and gonadal differentiation, as well as in the control of gonad stability in adult largemouth bass.
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