Identification of differentially expressed proteins in the testes of normal yaks and sterile hybrids by two-dimensional electrophoresis and mass spectrometry

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  • WEI FU Research fellow, Southwest University for Nationalities, Chengdu 610 041 China
  • CAIXIA LI Research fellow, Southwest University for Nationalities, Chengdu 610 041 China
  • WENJING LIU Lecturer, School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan
  • XIAOQIN MA Research fellow, Southwest University for Nationalities, Chengdu 610 041 China
  • XIANG QIU Senior engineer, Southwest University for Nationalities, Chengdu 610 041 China
  • LIANG REN Research fellow, Southwest University for Nationalities, Chengdu 610 041 China
  • LIN HUANG Engineer, Southwest University for Nationalities, Chengdu 610 041 China
  • SUYU JIN Senior engineer, Southwest University for Nationalities, Chengdu 610 041 China
  • YUCAI ZHENG Professor, College of Life Science and Technology, Southwest University for Nationalities, Chengdu 610 041 China


Bos grunniens, Hybrid, Male sterility, Testis, Two-dimensional electrophoresis


The study was conducted to compare differentially expressed proteins in the testes of adult yaks (Bos grunniens) and sterile cattle-yaks, in order to elucidate mechanisms of hybrid male sterility. Total proteins were extracted from testes and subject to 2-dimensional electrophoresis and mass spectrometry identification. A total of 19 differentially expressed proteins were identified, of which 13 were downregulated and 4 upregulated in cattle-yak testes. Interestingly, two chaperones (T-complex protein 1 and peptidyl-prolyl cis-trans isomerase) with decreased expressions in the testes of cattle-yaks were revealed, however, their association with the hybrid sterility is unclear. Protein phosphatase methylesterase-1 was decreased by over 8-folds in the testes of cattle-yaks than yaks, and may be associated with cell cycle arrest during spermatogenesis. Several proteins involved in male fertility and/or energy metabolism were also identified, such as mitochondrial peroxiredoxin-5 and sorbitol dehydrogenase. In addition, N (G), N (G)-dimethylarginine dimethylaminohydrolase (DDAH), which can increase the production of nitric oxide and affect normal spermatogenesis in testis, was upregulated in cattle-yak testes. The increased expression of DDAH is probably associated with male sterility of cattle-yaks. The results of this study suggest that the mechanisms of male sterility of cattle-yaks might be associated with many proteins of diverse functions, and some proteins such as chaperones and testis-specific proteins may play important roles.


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How to Cite

FU, W., LI, C., LIU, W., MA, X., QIU, X., REN, L., HUANG, L., JIN, S., & ZHENG, Y. (2015). Identification of differentially expressed proteins in the testes of normal yaks and sterile hybrids by two-dimensional electrophoresis and mass spectrometry. The Indian Journal of Animal Sciences, 85(11), 1181–1186.