Acta Veterinaria et Zootechnica Sinica ›› 2023, Vol. 54 ›› Issue (11): 4589-4604.doi: 10.11843/j.issn.0366-6964.2023.11.015

• ANIMAL GENETICS AND BREEDING • Previous Articles     Next Articles

Mining Candidate Genes Related to Meat Quality Traits of Longissimus Lumborum in Pingliang Red Steer Based on Transcriptome

WANG Wenxiang1, DU Lili1, HU Junwei2, ZHANG Yanxiang2, MA Minghao2, DUAN Rui2, QIAN Cong2, WANG Xinyue2, LI Sanlu3, ZHANG Changqing3, ZHANG Lupei1,2, GAO Xue1, XU Lingyang1, LI Junya1, GAO Huijiang1*   

  1. 1. Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    2. Institute of Pingliang Red Cattle, Pingliang 744000, China;
    3. Pingliang Cattle Industry Development Office, Pingliang 744000, China
  • Received:2023-04-25 Online:2023-11-23 Published:2023-11-26

Abstract: The aim of this study was to mine the candidate genes related to nutrient contents of longissimus lumborum in Pingliang red cattle, so as to improve the meat quality. Forty steers with 30-months-old slaughter age and 750 kg weight under the same feeding conditions were selected, and the contents of 3 conventional nutrients were measured, i.e., protein, fat, and moisture. The high and low groups with extreme differences in phenotypic data were selected, respectively, with 3 replicates each group. Principal component analysis and comparative transcriptome analysis were used to screen significant factor loading genes (SFLGs) and differentially expressed genes (DEGs), and these genes were subjected to enrichment analysis. Weighted gene co-expression network analysis (WGCNA) was performed using all sample transcriptome data and phenotype data to screen target gene modules (r>0.35 and P<0.05) and hub genes (HGs) related to phenotypes. The 91, 81, and 80 SFLGs (the first principal component PC1 and the second principal component PC2) and 18, 85, and 338 DEGs were identified for protein, fat, and moisture content traits, respectively. Among them, 8, 4, and 3 SFLGs were shared in PC1 and PC2, and 1, 3, and 2 DEGs showed significant factor loading, respectively. The enrichment analysis results were related to the corresponding phenotype. WGCNA screened 2 target gene modules respectively as well as 10, 14, and 26 HGs for protein, fat, and moisture contents, and all identified key candidate genes such as MYADML2 and ZBTB14, which might play important roles in influencing the proportional relationship among 3 nutrients. In this study, key genes related to meat quality traits were found by identifying candidates affecting 3 conventional nutrients contents. The research result will provide a theoretical basis for the breeding work of Pingliang red cattle and also provide reference for the quality breeding of other beef cattle.

Key words: Pingliang red steer, longissimus lumborum, nutrient contents, transcriptome

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