Integrated Multi-Omics Analysis Reveals Key Regulators of Bovine Oocyte Maturation

Area of Science:

• Reproductive Biology
• Metabolomics
• Molecular Biology

Background:

• Oocyte maturation is vital for reproductive success.
• Metabolic regulation of oocyte maturation is not fully understood.
• Bovine oocytes serve as a valuable model for studying these processes.

Purpose of the Study:

• To investigate metabolic and transcriptomic changes during bovine oocyte maturation.
• To identify key metabolic pathways and regulators involved in oocyte development.
• To provide a multi-omics resource for understanding oocyte maturation.

Main Methods:

• Comparative metabolomic and transcriptomic analysis of bovine oocytes.
• Examination of oocytes at germinal vesicle (GV) and metaphase II (MII) stages.
• Analysis of metabolic pathways including fatty acid oxidation, glycolysis, TCA cycle, and urea cycle.

Main Results:

• Suppressed beta-oxidation and accumulation of long-chain fatty acids (LCFAs) were observed.
• Progesterone was identified as a key regulator of meiotic resumption via cAMP.
• Enhanced glycolysis, moderate TCA cycle activation, suppressed oxidative phosphorylation (OXPHOS), and altered amino acid metabolism were noted.
• Discrepancies between metabolic and transcriptomic data suggest asynchronous pathway regulation.

Conclusions:

• Bovine oocyte maturation involves significant metabolic reprogramming.
• Progesterone plays a crucial role in regulating meiotic resumption through metabolic adjustments.
• The study provides a comprehensive multi-omics dataset advancing the understanding of oocyte maturation.