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Differentially expressed genes in longissimus dorsi by RNA-Sequencing in goats at different postnatal stages

ABSTRACT: Intramuscular fat (IMF) and its fatty acid composition in longissimus dorsi muscle (LM) are changed along with the growth of age, which partly determines the flavor and nutritional value of goat meat. However, unlike cattle, there is few data available on the transcriptome-wide changes at different postnatal stages in small ruminants specially for goats. In this study, the transcriptome by RNA sequencing of goat LM tissues collected from kid, youth and adult period were mapped to goat genome. Out of a total of 24689 unigenes, 20435 unigenes were annotated. Based on FPKM a total of 111 annotated differentially expressed genes (DEG) were identified among different postnatal stages, which was then classified to 16 possible expression patterns by series-cluster analysis. Functional classification through GO was used for selecting the top expressed genes related to lipid metabolism. Using co-expression analysis, we identified the node genes for lipid metabolism regulation. In conclusion, these data may provide candidate genes with high probability of having functional roles in regulating goat IMF deposition during the various growth stages.

ORGANISM(S): Capra hircus

PROVIDER: GSE85014 | GEO | 2017/01/20

REPOSITORIES: GEO

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Project description:CPT1B, as the major rate-limiting enzyme for fatty acid β-oxidation, involved in the regulation of adipose tissue lipid deposition, but its role in the regulation of goat intramuscular fat (IMF) remains unclear. Here, we conducted knockdown experiments targeting the CPT1B gene in goat intramuscular preadipocytes, resulting in a significant increase in intracellular triglyceride (TAG) content and lipid droplet accumulation. Conversely, the overexpression of CPT1B led to a significant decrease in intracellular TAG content and lipid droplet accumulation. Mechanistically, through RNA-seq analysis of CPT1B knockdown samples, we identified 285 differentially expressed genes (DEGs), including 71 up-regulated and 214 down-regulated genes. Notably, these DEGs were significantly enriched in various KEGG signaling pathways, such as fatty acid metabolism, focal adhesion, FoxO signaling, PI3K-Akt signaling, and MAPK signaling pathways. Gene Set Enrichment Analysis (GSEA) further confirmed the upregulation of the MAPK signaling pathway upon CPT1B knockdown in adipocytes. In rescue experiments, we demonstrated that the addition of a p38MAPK inhibitor (PD169316) to CPT1B-knockdown adipocytes counteracted the increase in lipid deposition caused by the loss of CPT1B function. These findings suggest that CPT1B inhibits lipid deposition in goat intramuscular preadipocytes via the p38MAPK signaling pathway. In addition, we observed a potential interaction between CPT1B and CPT1A through Protein-Protein Interaction Networks (PPIs). Interestingly, CPT1A exhibited a similar regulatory function to CPT1B, and they both were able to partially restore the changes in lipid deposition induced by each other. This observation supports the hypothesis of synergistic effects between CPT1B and CPT1A. Collectively, our results elucidate the role of CPT1B in the regulation of lipid deposition in goat intramuscular adipocytes through the p38MAPK signaling pathway, providing valuable insights for enhancing the quality of goat intramuscular fat.

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Differentially expressed genes in longissimus dorsi by RNA-Sequencing in goats at different postnatal stages

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