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Hui Ji,Hui Wang,Qiumei Ji,Winbo Ji,Xiaolin Luo,Jiabo Wang,Zhixin Chai,Jinwei Xin,Xin Cai,Zhijuan Wu,Jikun Wang,Jincheng Zhong 한국유전학회 2020 Genes & Genomics Vol.42 No.11
Background miRNAs play an important role in regulating normal animal development. Muscle tissue and fat metabolismare important for maintaining energy balance in animals. Yak has important agricultural and economic importance as itprovides milk, meat, and hair. It is used for transportation as well. However, the miRNA expression profiles of their muscleand adipose tissue are currently unknown. Objective To explore the regulatory roles of miRNAs in the skeletal muscle and adipose tissues of yak. Methods A total of 12 small RNA libraries were constructed from the skeletal muscle and adipose samples from yak aged 0.5,2.5, 4.5, and 7.5 years. High-throughput sequencing and bioinformatics analysis were used to determine the dynamic expressionprofile of miRNA, and a miRNA regulatory network related to muscle and adipose tissue development was established. Results miR-1-3p and miR-143-3p showed the highest expression during yak skeletal muscle and fat development, respectively. The MAPK and Ras signaling pathways were the pivotal pathways. miR-181-5p, miR-542-3p, and miR-424-5p mayhave key roles in skeletal muscle development, and CREBRF, GRB10, CDK1, RFX3, and EPC2 were the core target genes. While miR-127-5p, miR-379-3p, and miR-494-3p may play important regulatory roles in adipose deposition, and ETV1,XPO7, and C5AR2 were the core target genes. Conclusion This study provides valuable resources for further study of the molecular mechanisms underlying yak skeletalmuscle and adipose tissue development, and also a basis for studying the interactions between genes and miRNAs.