Comparative Analysis of Epididymis Cauda of Yak before and after Sexual Maturity

Simple Summary Yak are an important source of produce and living materials for plateau herdsmen. However, the population of yak is small and their reproductive capacity is low, so it is very important to improve their reproductive potential. The epididymis is an important place for sperm maturation and storage, but the differential expression of the cauda epididymis before and after sexual maturity in yak has not been characterized. In this study, the key genes regulating epididymal cauda development and sperm maturation were screened by RNA-seq and proteomics. These results ultimately provide a theoretical basis for how to improve the reproductive potential of yak. Abstract Epididymis development is the basis of male reproduction and is a crucial site where sperm maturation occurs. In order to further understand the epididymal development of yak and how to regulate sperm maturation, we conducted a multi-omics analysis. We detected 2274 differential genes, 222 differential proteins and 117 co-expression genes in the cauda epididymis of yak before and after sexual maturity by RNA-seq and proteomics techniques, which included TGFBI, COL1A1, COL1A2, COL3A1, COL12A1, SULT2B1, KRT19, and NPC2. These high abundance genes are mainly related to cell growth, differentiation, adhesion and sperm maturation, and are mainly enriched via extracellular matrix receptor interaction, protein differentiation and absorption, and lysosome and estrogen signaling pathways. The abnormal expression of these genes may lead to the retardation of epididymal cauda development and abnormal sperm function in yak. In conclusion, through single and combined analysis, we provided a theoretical basis for the development of the yak epididymal cauda, sperm maturation, and screening of key genes involved in the regulation of male yak reproduction.

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