Characterization of genes for beef marbling based on applying gene coexpression network

Area of Science:

• Animal Genetics
• Molecular Biology
• Food Science

Background:

• Beef quality, particularly marbling, significantly impacts market value.
• Marbling is a complex trait requiring a systems-level approach to identify associated genes.
• Understanding genetic factors influencing marbling is key to improving beef production.

Purpose of the Study:

• To identify candidate genes associated with beef marbling using a network-based approach.
• To investigate the role of specific genes in the development of intramuscular fat deposition.
• To provide insights into the genetic architecture of beef marbling.

Main Methods:

• Weighted gene co-expression network analysis (WGCNA) of bovine gene expression data.
• Identification of hub genes based on topological parameters (degree and betweenness centrality).
• Quantitative real-time PCR (qRT-PCR) validation of candidate genes in M. longissimus with varying marbling scores.

Main Results:

• Transmembrane protein 60 (TMEM60) and dihydropyrimidine dehydrogenase (DPYD) were identified as candidate genes.
• Expression analysis confirmed the association of TMEM60 and DPYD with increased marbling fat.
• Network-based analysis successfully highlighted key genes involved in a complex trait.

Conclusions:

• TMEM60 and DPYD are potential genetic markers for enhancing beef marbling.
• A systems-level, network-based approach is effective for dissecting complex traits in livestock.
• This study provides a foundation for future genetic selection strategies to improve beef quality.