大鼠SLC7a8基因的克隆及真核表达载体的构建

目的：克隆大鼠左旋氨基酸转运体（SLC7a8）基因cDNA的读码框（CDS）,构建携带SLC7a8基因的重组真核表达载体,为进一步研究其在自发性高血压大鼠（spontaneously hypertensive rats,SHR）中的功能作准备。方法：从非高血压大鼠（wistar-kyoto,WKY）肾脏组织提取总RNA,通过RT-PCR得到总cDNA,PCR法扩增,产物连接pGEM-T Easy载体测序分析正确后,再以PCR方法扩增,将其连接入真核表达质粒pcDNA3.1（＋）。以PCR、双酶切和测序鉴定正确后,将重组载体pcDNA3.1（＋）-SLC7a8用脂质体包裹转染大鼠肾小管上皮细胞（NRK-52E）,RT-PCR法及Western blotting法分别检测转染后SLC7a8 mRNA及蛋白表达水平。结果：成功克隆了大鼠SLC7a8基因cDNA,重组真核表达载体pcDNA3.1（＋）-SLC7a8构建成功,且证实转染后肾小管上皮细胞的SLC7a8 mRNA及蛋白表达均明显高于空白对照组（P〈0.05）及空质粒组（P〈0.05）。结论：成功克隆了SLC7a8基因,并构建了真核表达载体pcDNA3.1（＋）-SLC7a8,能够在NRK-52E细胞中获得有效过表达,这为进一步探讨SLC7a8基因的生物学功能奠定了基础。

Cloning of rat SLC7a8 gene and construction of eukaryotic expression vector

Objective: To clone rat SLC7a8 gene cDNA and construct its eukaryotic expression vector for its function study in SHR.Methods: Total RNA was extracted from rat kidney tissue.SLC7a8 cDNA was prepared by RT-PCR,and inserted into pGEM-T Easy vector and confirmed by sequence analysis.Then the pGEM-T Easy vector which contained SLC7a8 cDNA was also amplified by PCR,and cloned into pcDNA3.1(+) plasmid.The recombinant plasmid was confirmed by PCR,double enzyme digestion analysis and DNA sequencing.Then the recombi...