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脂肪酶成熟因子1蛋白(Lipase maturation factor 1, LMF1), 是在脂肪酶成熟过程中发挥重要作用的一种内质网膜蛋白[1], 在高等动物的大部分组织中均表达, 对动物体脂肪代谢、能量平衡具有非常重要的调节作用, 是机体脂质代谢和血脂稳态调控网络的重要调节因子[2-3].研究表明, LMF1基因作为内质网上的分子伴侣参与了脂蛋白脂酶(LPL)、肝脂酶(HL)和内皮脂肪酶(EL)几种血管酯酶的翻译后成熟和催化活化[4], 且LMF1基因的突变或缺失会导致人和动物体联合缺乏症(combined lipase deficiency, CLD), 进而诱发严重的高甘油三酯血症, 是肥胖、糖尿病和各种心血管疾病的主要发病原因[5-7].然而, 目前关于LMF1的研究, 主要集中在人类和小鼠脂质代谢紊乱引起的相关疾病方面, 而对猪、马、牛、羊等大家畜上报道相对较少.鉴于LMF1基因在脂质代谢中的重要作用, 因此可考虑将该基因作为畜禽生产性状的候选基因来进行研究.
从江香猪作为著名的脂肪型小型猪, 具有体型小、基因纯合等特点, 是进一步研究机体脂质代谢紊乱导致人类各种疾病最为理想的模式动物之一.猪的LMF1基因定位于3号染色体上, 全长3 258 bp, 由8个外显子和7个内含子构成, 其CDS区全长996 bp, 编码332个AA.本文以从江香猪为研究对象, 克隆分析LMF1基因, 研究从江香猪LMF1基因与其他猪种基因的差异, 并通过细胞转染和荧光共定位的技术手段, 验证LMF1基因在细胞中的亚细胞定位情况, 建立猪LMF1基因在猪上的基础数据.相关研究结果将为进一步研究LMF1蛋白与LPL, HL和EL几种血管酯酶在脂质代谢的作用机理方面奠定基础.
Cloning, Subcellular Localization and Tissue Expression of LMF1 Gene in Congjiang Xiang Pig
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摘要: 为研究脂肪酶成熟因子1(LMF1) 基因在从江香猪不同组织的表达情况及在真核细胞中的亚细胞定位情况, 采用RT-PCR, Real-Time PCR, PSORT Ⅱ Prediction软件结合荧光共定位的方法, 克隆了从江香猪LMF1基因cDNA, 构建了pEGFP-C1-LMF1真核表达载体, 分析了LMF1基因在不同组织的表达差异和亚细胞定位情况.结果表明, 从江香猪LMF1基因与GenBank上提交的其他猪种的同源性达到了100%; LMF1基因在脂肪中表达量最高, 心中最低, 且脂肪和小肠与其他7个组织相比, 表达量均存在统计学意义(p < 0.01);荧光共定位结果表明, LMF1基因主要集中在细胞质中表达.相关结果对后续研究LMF1蛋白与其互作蛋白在脂质代谢的作用机理奠定的基础.Abstract: In order to study the expression of lipase maturation factor 1 (LMF1 gene) in different tissues of Congjing Xiang pig and its subcelluar localization, RT-PCR (real-time PCR), PSORT Ⅱ Prediction and fluorescent co-location were used to clone the cDNA of LMF1 gene, construct the recombinant eukaryotic vector of pEGFP-C1-LMF1, and analyze the difference of its expression in various tissues and subcelluar localization, so as to provide a foundation for researching the mechanism of LMF1 protein and its interaction proteins in lipid metabolism. The results showed that the cDNA region of LMF1 gene of Congjiang Xiang pig and that of other pig breeds in GenBank submission shared a 100% homology. LMF1 gene had the highest expression in the fat and the lowest in the heart, and its expression in the fat and the small intestine was highly different from that in the other 7 tissues (p < 0.01). Fluorescent co-location demonstrated that LMF1 gene was mainly expressed in the cytoplasm.
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表 1 LMF1基因克隆引物和荧光定量引物
目的基因 引物序列 产物大小/bp 退火温度/℃ LMF1 F:5′-CCCTCGAG GCATGGATTTCCACTATGAGAC-3′
R:5′-CGGGATCCCACCGTCTTTCCCACTTTATT-3′1 047 60 LMF1 YGF:5′-CATCACCAAGGAGCGCACAGAG-3′
YGR:5′-ATAGGTCTGGAAGGCAGCGAAC-3′190 58 GAPDH F:5′-TTGTGATGGGCGTGAACC-3′
R:5′-GTCTTCTGGGTGGCAGTGAT-3′169 58 -
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