基于转录组分析干扰FABP1基因对猪肌内脂肪沉积的影响

Transcriptome-based analysis of the effects of interference with FABP1 gene on intramuscular fat deposition in pigs

  • 摘要: 【目的】探究FABP1基因对猪肌内脂肪细胞生物学功能的影响机制,为进一步研究FABP1对猪肌内脂肪沉积和脂质代谢的调控作用提供参考依据。【方法】将sh-FABP1干扰载体和空载体sh-NC分别转染至香苏杂交猪肌内脂肪细胞中,36 h后收集转染后的肌内脂肪细胞,采用TRIzol® Reagent总RNA提取试剂盒提取总RNA,待样本质检合格后,每个样品制备1 µg的RNA总量用于测序。运用生物信息学进行基因表达水平分析(基因表达水平计算、样本间相关性评估)、基因差异表达分析[差异表达基因(DEGs)筛选和统计、DEGs火山图]和功能富集分析(GO富集分析、KEGG富集分析)。最后分别挑选4个上调基因和4个下调基因运用实时荧光定量PCR验证转录组测序数据。【结果】sh-FABP1与sh-NC之间总共筛选出1129个DEGs,与sh-NC组相比,sh-FABP1上调基因有624个,包括PRKAR2A、ACSL5、ELOVL5MAPK1等;下调基因有505个,包括LPL、FABP3、IGFBP4OLR1等。对sh-FABP1与sh-NC之间的DEGs进行功能富集分析,KEGG富集发现上调基因主要在细胞周期(Cell cycle)、肿瘤抑制蛋白(p53)和Notch信号通路中富集,下调基因主要富集在过氧化物酶体增殖物激活受体(PPAR)、磷脂酰肌醇3激酶-蛋白激酶B (PI3K-Akt)信号通路中。GO注释表明,有22个、15个和9个GO术语分别在生物过程(BP)、细胞成分(CC)和分子功能(MF)中显著富集(P<0.05,下同),显示与脂肪沉积相关具有显著差异的GO术语包括生物粘附(Biological adhesion)、生物调节(Biological regulation)、生物过程调节(Regulation of biological process)和代谢过程(Metabolic process)。【结论】FABP1基因可能通过调节LPL、FABP3、IGFBP4OLR1等相关基因的表达、脂肪沉积和脂质代谢相关通路,从而调节脂质生成和代谢。

     

    Abstract: 【Objective】 The purpose of the study was to investigate the effect mechanism of FABP1 gene on the biological function of intramuscular adipocytes in pigs,and to provide reference basis for further study on the regulatory role of FABP1 on intramuscular fat deposition and lipid metabolism in pigs.【Method】The sh-FABP1 interfering vector and empty vector sh-NC were transfected into Xiangsu crossbred pig intramuscular adipocytes respectively. 36 h later,the transfected intramuscular adipocytes were collected and total RNA was extracted using TRIzol® Reagent total RNA extraction kit. After the samples passed quality inspection,1 µg of total RNA per sample was prepared for sequencing. Bioinformatics was then used to perform gene expression level analysis(gene expression level calculation,correlation assessment between samples),gene differential expression analysisdifferentially expressed genes(DEGs)screening and statistics, DEGs volcano map,and functional enrichment analysis(GO enrichment analysis,KEGG enrichment analysis). Finally,four up-regulated genes and four down-regulated genes were selected for validation of transcriptome sequencing data by real-time fluorescence quantitative PCR.【Result】 A total of 1129 DEGs were screened between sh-FABP1 and sh-NC. Compared with the sh-NC group,there were 624 up-regulated genes in sh-FABP1,including PRKAR2A,ACSL5, ELOVL5 and MAPK1;and 505 down-regulated genes,including LPL,FABP3,IGFBP4 and OLR1. Functional enrichment analysis of DEGs between sh-FABP1 and sh-NC was performed. KEGG enrichment revealed that up-regulated genes were mainly enriched in cell cycle,tumor suppressor protein(p53),and Notch signaling pathways,while down-regulated genes were mainly enriched in peroxisome proliferator activated receptor(PPAR),and phosphatidylinositol 3-kinaseprotein kinase B(PI3K-Akt)signaling pathways. GO annotation showed that 22,15 and 9 GO terms were significantly enriched in biological process(BP),cellular component(CC),and molecular function(MF)respectively(P<0.05,the same below). This revealed that GO terms associated with fat deposition with significant differences included biological adhesion,biological regulation,regulation of biological process,and metabolic process.【Conclusion】The FABP1 gene may regulate lipid production and metabolism by regulating the expression of related genes such as LPL,FABP3, IGFBP4 and OLR1,and then regulate pathways related to fat deposition and lipid metabolism.

     

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