Transcriptome Analysis of miRNAs Involved in the Myogenic Differentiation of Goat Skeletal Muscle Satellite Cells

Skeletal muscle myogenesis is a crucial factor influencing meat production in livestock. MicroRNAs (miRNAs) play a significant role in skeletal muscle myogenesis. The objective of this study was to identify key miRNAs involved in the process of goat skeletal muscle satellite cell (MuSC) differentiation into myotubes. We performed miRNA expression profiling analysis during the proliferation phase (cultured in growth medium, GM) and the differentiation phase (cultured in differentiation medium for 1 day and 5 days, classified as DM1 and DM5, respectively) of goat skeletal muscle satellite cells (MuSCs). A total of 1846 miRNAs were identified in MuSC samples, of which 677 differentially expressed miRNAs (DEmiRNAs) were screened through pairwise comparisons across three groups (GM vs. DM1, GM vs. DM5, and DM1 vs. DM5), and the results were further confirmed by a quantitative real-time PCR assay. Time-series expression profiling facilitated the categorization of the DEmiRNAs into eight distinct clusters, one of which demonstrated a significantly downregulated expression pattern (p < 0.05). Functional enrichment analysis revealed that the target genes of DEmiRNAs are involved in several pathways that are critical for myogenesis, including Hippo, TGF-β, MAPK and cell adhesion molecules. Interaction network analysis identified 19 miRNAs and 56 mRNAs associated with muscle cell development. Notably, novel-m0047-5p emerged as a key regulator, exhibiting strong negative correlations (r = -0.88 to -0.89, q < 0.01) with muscle-related target genes FOSB, CPT1B, and MYOZ2. These findings elucidate miRNA-mediated regulatory networks in goat myogenesis and provide candidate molecular targets for genetic improvement of meat production traits.