Hypogonadotropic hypogonadism in male tilapia lacking a functional rln3b gene

文献类型： 外文期刊

第一作者： Xu, Qinglei

作者： Xu, Qinglei;Zhou, Linyan;Xu, Jian;Ye, Maolin;Su, Yun;Feng, Li;Wang, Deshou

作者机构：

关键词： Nile tilapia; rln3b; Male fertility; HPG axis

期刊名称：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES （ 影响因子：8.2； 五年影响因子：7.8 ）

ISSN： 0141-8130

年卷期： 2024 年 270 卷

页码：

收录情况： SCI

摘要： Relaxin 3 is a neuropeptide that plays a crucial role in reproductive functions of mammals. Previous studies have confirmed that rln3a plays an important role in the male reproduction of tilapia. To further understand the significance of its paralogous gene rln3b in male fertility, we generated a homozygous mutant line of rln3b in Nile tilapia. Our findings indicated that rln3b mutation delayed spermatogenesis and led to abnormal testes structure. Knocking out rln3b gene resulted in a decrease in sperm count, sperm motility and male fish fertility. TUNEL detection revealed a small amount of apoptosis in the testes of rln3b - /- male fish at 390 days after hatching (dah). RT-qPCR analysis demonstrated that mutation of rln3b gene caused a significant downregulation of steroid synthesis-related genes such as cyp17a1 , cyp11b2 , germ cell marker gene, Vasa , and gonadal somatic cell marker genes of amh and amhr2 . Furthermore, we found a significant down-regulation of hypothalamic-pituitarygonadal (HPG) axis-related genes, while a significantly up-regulation of the dopamine synthetase gene in the rln3b -/- male fish. Taken together, our data strongly suggested that Rln3b played a crucial role in the fertility of XY tilapia by regulating HPG axis genes.

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