Acta Veterinaria et Zootechnica Sinica ›› 2025, Vol. 56 ›› Issue (4): 1981-1988.doi: 10.11843/j.issn.0366-6964.2025.04.044

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Mining and Functional Verification of Gene Polymorphisms Loci Related to Bull Sperm Freezability

LI Xiaotong1(), WANG Pengyu1(), FANG Yingyan1(), YU Hongxi1, ZHANG Yi1, WANG Yachun1, ZHANG Yuanpei2, LI Yanqin3, JIANG Li1,*()   

  1. 1. State Key Laboratory of Animal Biotech Breeding, College of Animal Science and Technology, China Agriculture University, Beijing 100193, China
    2. Shandong OX Livestock Breeding Co., Ltd., Jinan 250100, China
    3. Institute of Animal Science and Veterinary Medicine, Shandong Academy of Agricultural Sciences, Jinan 250100, China
  • Received:2024-10-15 Online:2025-04-23 Published:2025-04-28
  • Contact: JIANG Li E-mail:lixiaotong@cau.edu.cn;2022333020304@cau.edu.cn;ny18318118563@cau.edu.cn;lijiang@cau.edu.cn

Abstract:

The study aimed to identify key genes and molecular markers that affect the freezability of bull sperm and apply them to molecular breeding of dairy cattle. In this study, 11 candidate genes related to bull sperm freezability were identified based on the previous omics study, such as ATP5F1A, DNASE2, and LPO. Primers were designed for the exons of these genes to detect genetic variation sites via PCR pooled sequencing. Subsequently, the Time-of-Flight mass spectrometry was used to genotype important loci in a resource population of 130 healthy bulls and association analysis was performed. Among them, there were 55 bulls in the high sperm freezability group, with an average fresh sperm motility of 0.68 and an average post-freeze motility of 0.42, and 75 bulls in the low sperm freezability group, with an average fresh sperm motility of 0.65 and an average post-freeze motility of 0.32. Finally, 14 significant SNPs were identified, among which the rs110909003 SNP (C/T) located in the exon of ATP5F1A was significantly associated with the bull sperm freezability (P=0.009). Western blot analysis was performed to detect the expression of ATP5F1A in sperm with different genotypes at the rs110909003 locus. The results showed a significant increase in ATP5F1A protein expression in sperm from bulls with the CC genotype compared to those with the TT genotype. This study identified ATP5F1A significantly associated with bull sperm freezability, as well as an important molecular marker, the rs110909003 SNP, located within this gene. This SNP may influence sperm freezability by affecting the mitochondrial oxidative phosphorylation process. These findings provide valuable information for the molecular breeding of frozen semen quality traits in Holstein bulls.

Key words: Holstein cattle, sperm, freezability, functional genes, molecular markers

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