摘要
肌内脂肪沉积作为影响肉品质(如嫩度、风味和多汁性)的关键因素,其调控机制与长链非编码RNA(lncRNA)对脂肪生成和脂质代谢的调节密切相关。基于前期研究发现,滩羊肌内脂肪含量显著高于杜泊羊和小尾寒羊,以这3个绵羊品种的背最长肌为研究对象,通过转录组测序筛选差异表达mRNAs(DE mRNAs)和lncRNAs(DE lncRNAs)及其相关通路,旨在揭示滩羊高肌内脂肪沉积的分子机制。结果表明:在小尾寒羊和滩羊组筛选出836个DE mRNAs,832个DE lncRNAs,杜泊羊和滩羊组筛选出578个DE mRNAs,700个DE lncRNAs。两组分别取交集共得到226 DE mRNAs,308个DE lncRNAs,通过对308个DE lncRNAs进行靶基因预测,共预测到1475个靶基因,其中预测到co_expression(共表达)靶基因687个,co_localization(共定位)靶基因有788个;通过对DE mRNAs进行GO和KEGG富集发现,其中与脂肪沉积相关的通路有肌动蛋白细胞骨架调节、催乳素信号通路等,其中FGF14、FGF9等基因被报道参与动物的脂肪代谢过程。通过对预测到的共表达靶基因和共定位靶基因进行GO和KEGG富集分析,发现它们富集到与脂肪代谢的相关通路,如cAMP信号通路、催乳素信号通路、胰岛素信号通路等;通过对通路和功能分析进一步筛选出和脂肪代谢相关的CREBBP、ATP1B3、PPP1R3C、PIK3R1等基因,这些基因在绵羊肌内脂肪沉积方面可能发挥重要调控作用。随机选择的6个DE mRNAs和6个DE lncRNAs的qRT-PCR结果与转录组测序结果趋势一致。
Intramuscular fat deposition,as a key factor affecting meat quality(e.g.tenderness,flavor,and juiciness),is closely related to the regulation of lipogenesis and lipid metabolism by long non-coding RNA(lncRNA).Based on the previous finding that the intramuscular fat content of Tan sheep was significantly higher than that of Dorper sheep and Small-tailed Han sheep,the dorsal longest muscle of these three sheep breeds was used as the target,and differentially expressed mRNAs(DE mRNAs)and lncRNAs(DE lncRNAs)and their related pathways were screened by transcriptome sequencing,with the aim of revealing molecular mechanism of high intramuscular fat deposition in Tan sheep.The results showed:836 DE mRNAs and 832 DE lncRNAs were identified in the Small-tailed Han sheep vs.Tan sheep group;578 DE mRNAs and 700 DE lncRNAs were screened in the Dorper sheep vs.Tan sheep group.The intersection of the two groups fielded a total of 226 DE mRNAs and 308 DE lncRNAs.Target gene prediction for the 308 DE lncRNAs identified 1475 potential targets,including 687 co_expression(co-expressed)target genes and 788 co_localization(co-localized)target genes.GO and KEGG enrichment analysis of DE mRNAs revealed fat deposition-related pathways such as regulation of actin cytoskeleton and prolactin signaling pathway,with genes like FGF14 and FGF9 were reported to participate in animal fat metabolism.Enrichment analysis of co-expressed and co-localized target genes identified fat metabolism-related pathways,including the cAMP signaling pathway,prolactin signaling pathway,and insulin signaling pathway.Further functional analysis screened key genes associated with fat metabolism(CREBBP,ATP1B3,PPP1R3C,and PIK3R1),which may play crucial regulatory roles in ovine intramuscular fat deposition.The qRT-PCR results of 6 randomly selected DE mRNAs and 6 randomly selected DE lncRNAs were consistent with transcriptome sequencing data.
作者
王丁香
李承隆
郭晨浩
冯登侦
康晓龙
WANG Dingxiang;LI Chenglong;GUO Chenhao;FENG Dengzhen;KANG Xiaolong(College of Animal Science and Technology,Ningxia University,Yinchuan 750021,China)
出处
《华北农学报》
北大核心
2025年第6期202-211,共10页
Acta Agriculturae Boreali-Sinica
基金
宁夏自然科学基金项目(2020AAC03082)
宁夏回族自治区农业育种专项(nxnyyz20150101)。
