The low expression of Dmrt7 is associated with spermatogenic arrest in cattle-yak

文献类型： 外文期刊

第一作者： Yan, Ping

作者： Yan, Ping;Guo, Xian;Bao, Peng-Jia;Jin, Shuai;Wu, Xiao-Yun;Yan, Ping;Guo, Xian;Bao, Peng-Jia;Jin, Shuai;Wu, Xiao-Yun;Xiang, Lin

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关键词： Cattle-yak;Male infertility;Dmrt7;Testis;Spermatogenesis;Pachynema

期刊名称：MOLECULAR BIOLOGY REPORTS （ 影响因子：2.316； 五年影响因子：2.357 ）

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收录情况： SCI

摘要： Dmrt7 is a member of the DM domain family of genes. Dmrt7 deficiency is also a strong candidate as a cause for male cattle-yak infertility, as it is regarded as essential for male spermatogenesis, between the pachynema and diplonema stages. In our study, the coding region sequence of yak and cattle-yak Dmrt7 was cloned by molecular cloning techniques, and the sequence, conserved domains, functional sites, and secondary and tertiary structures of the Dmrt7-encoded protein were predicted and analyzed using bioinformatics methods. The coding region sequences of the Dmrt7 gene, encoding 370 amino acids, were consistent in yak and cattle-yak. The protein encoded by yak and cattle-yak Dmrt7 contains a DM domain. We detected Dmrt7 mRNA expression in testis, but not in any other tissue. Dmrt7 mRNA and protein expression was significantly higher in testis of cattle and yak than that in cattle-yak (p < 0.01). Histological analysis indicated that seminiferous tubules in male cattle-yak were highly vacuolated and contained primarily Sertoli cells and spermatogonia, while those of cattle and yak contained abundant primary spermatocytes. Male cattle-yak testis contained a significantly larger number of apoptotic cells than those in cattle and yak assessed by terminal deoxynucleotidyl transferase dUTP nick end-labeling (TUNEL) analysis. The accumulation of SCP3-positive spermatocytes indicated the arrest of spermatogenesis at the pachynema stage in the cattle-yak. These results suggest low levels of Dmrt7 expression lead to male sterility in cattle-yak. The molecular function of Dmrt7 and the regulation of its expression warrant need to be examined in future studies.

分类号： Q7

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