Key result
Transcriptomic analysis links 141 differentially expressed circRNAs to subcutaneous fat deposition in sheep.
Why the study?
The exact chemical mechanism behind fat accumulation in sheep subcutaneous fat is unknown, motivating investigation of circRNA expression profiles.
This study identifies key circRNAs and signaling pathways involved in sheep fat deposition, providing a basis for understanding sheep fat metabolism.
Answers are grounded in this paper and cite their sources.
Hypothesis-generating for circRNA roles in ovine adiposity; leaves open functional validation and relevance to other species.
BACKGROUND: Circular RNAs (circRNAs), as important non-coding RNAs (ncRNAs), are involved in many biological activities. However, the exact chemical mechanism behind fat accumulation is unknown. In this paper, we obtained the expression profiles of circRNAs using high-throughput sequencing and investigated their differential expression in subcutaneous fat tissue of Duolang and Small Tail Han sheep. RESULTS: From the transcriptomic analysis, 141 differentially expressed circRNAs were identified, comprising 61 up-regulated circRNAs and 80 down-regulated circRNAs. These host genes were primarily enriched in the MAPK and AMPK signaling pathways which is closely associated with fat deposition regulation. We identified circRNA812, circRNA91, and circRNA388 as vital genes in fat deposition by miRNA-circRNA target gene prediction. The functional annotation results of target genes of key circRNAs showed that the signaling pathways mainly included PI3K-Akt and AMPK. We constructed the competing endogenous RNA (ceRNA) regulatory network to study the role of circRNAs in sheep lipid deposition, and circRNA812, circRNA91, and circRNA388 can adsorb more miRNAs. NC_040253.1_5757, as the source of miRNA response element (MRE) among the three, may play an important role during the process of sheep fat deposition. CONCLUSIONS: Our study gives a systematic examination of the circRNA profiles expressed in sheep subcutaneous fat. These results from this study provide some new basis for understanding circRNA function and sheep fat metabolism.
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Liu et al. (2023) studied Fat deposition in sheep (n=6). Breed (Duolang vs Small Tail Han sheep) vs. Small Tail Han sheep was evaluated on Differentially expressed circRNAs in subcutaneous fat tissue. Transcriptomic analysis identified 141 differentially expressed circRNAs in sheep subcutaneous fat, with circRNA812, circRNA91, and circRNA388 identified as vital genes in fat deposition.
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