Chianina beef tenderness investigated through integrated Omics

Area of Science:

• Meat science
• Biochemistry
• Animal science

Background:

• Meat tenderness is a critical quality trait in beef cattle.
• Understanding the molecular mechanisms underlying meat tenderness is essential for improving beef quality.

Purpose of the Study:

• To investigate the molecular differences between tender and tough Longissimus dorsi meat in Chianina beef cattle using an integrated omics approach.
• To correlate omics data with traditional meat quality parameters.

Main Methods:

• Integrated proteomics, interactomics, and metabolomics analysis.
• Measurement of Warner Bratzler shear force, myofibrillar degradation, sarcomere length, and collagen content.
• Statistical analysis using Pearson's correlation coefficients.

Main Results:

• Tender meat exhibited higher levels of over-phosphorylated glycolytic enzymes and accumulated glycolytic intermediates.
• Oxidative stress promoted tenderness and induced heat shock protein (HSP) responses, leading to apoptosis-like cascades.
• Phosphorylation was identified as a crucial postmortem process modulating enzyme activity and protein stability, with breed-specific differences noted between Chianina and Maremmana cattle.

Conclusions:

• Postmortem metabolism and meat tenderness are influenced by breed-specific phosphorylation patterns and metabolic pathways.
• Higher early postmortem phosphocreatine levels in Chianina tender meat may indicate a slower glycolytic rate, potentially extending the aging period required for optimal tenderness.