Comparative testis proteome of cattleyak from different developmental stages

Area of Science:

• Animal Science
• Proteomics
• Reproductive Biology

Background:

• Cattleyak hybrids offer enhanced adaptability and production over cattle and yaks.
• Male infertility in cattleyak F1 hybrids limits their practical application.
• Mechanisms underlying cattleyak male infertility remain largely unexplored.

Purpose of the Study:

• To investigate the testicular proteome differences in cattleyak at various developmental stages (10, 12, and 14 months).
• To identify differentially expressed proteins associated with male infertility in cattleyak.
• To provide candidate proteins for understanding the molecular basis of cattleyak infertility.

Main Methods:

• Proteomic analysis using isobaric tag for relative and absolute quantification (iTRAQ).
• Comparison of testicular proteomes from 10, 12, and 14-month-old cattleyak individuals.
• Gene Ontology (GO) annotation and functional enrichment analysis of differentially expressed proteins.

Main Results:

• Significant differences in testicular proteomes were observed between 12-month/14-month and 10-month-old cattleyak.
• Histological observations of germ cell reduction and spermatogenic arrest in 12-month-old cattleyak were supported by proteomic data.
• 56 proteins were co-expressed at 12 and 14 months compared to 10 months, with 32 upregulated and 24 downregulated.
• Key proteins identified include testis-expressed protein 101, RNA-binding proteins, glutathione S-transferases, and heat shock proteins, potentially linked to spermatogenesis.

Conclusions:

• The study identified significant proteomic alterations in developing cattleyak testes, correlating with observed infertility.
• Several differentially expressed proteins, particularly those involved in catalytic activity and spermatogenesis, are implicated in cattleyak infertility.
• These findings offer crucial insights and candidate proteins for future research into the mechanisms of cattleyak male infertility.