Hepatic Transcriptome Analysis Reveals Genes, Polymorphisms, and Molecules Related to Lamb Tenderness

Area of Science:

• Animal Genomics
• Meat Science
• Molecular Biology

Background:

• Lamb tenderness is crucial for consumer acceptance and the sheep industry's sustainability.
• Understanding the genetic basis of tenderness is essential for selective breeding.
• Hepatic metabolism plays a role in muscle development and meat quality traits.

Purpose of the Study:

• To identify transcriptome signatures and genetic polymorphisms associated with varying lamb tenderness.
• To uncover the molecular mechanisms underlying differences in lamb meat tenderness.

Main Methods:

• RNA deep sequencing of hepatic tissues from sheep with high and low lamb tenderness.
• Differential gene expression analysis to identify significant genes (DEGs).
• Pathway analysis to determine biological pathways involved.
• Polymorphism and association analysis to find candidate genetic markers.

Main Results:

• 328 differentially expressed genes (DEGs) were identified, with 110 up-regulated and 218 down-regulated.
• Steroid hormone biosynthesis emerged as the dominant pathway influencing lamb tenderness.
• Key candidate genes (e.g., TP53INP1, CYP2E1, ANGPTL2, OLFML3) and potential genetic markers (OLFML3, ANGPTL2, THOC5) were identified.

Conclusions:

• The study identified genes and pathways contributing to variations in lamb tenderness.
• These findings offer potential genetic markers for improving lamb meat quality through selective breeding.
• Further validation in diverse sheep populations is necessary to confirm marker efficacy for selection programs.