摘要
目的:筛选与克隆HBV和HCV蛋白反式调节靶基因,阐明HBV和HCV感染后慢性肝脏疾病的发病机制.方法:应用抑制性消减杂交(SSH)技术及表达谱基因芯片(cDNAmicroarray)技术筛选并克隆HBV和HCV蛋白反式调节的靶基因.以HBV和HCV蛋白的表达质粒转染HepG2细胞,以空载体pcDNA3.1(-)为平行对照,制备转染后的细胞裂解液,提取mRNA并逆转录为cDNA,经RsaI酶切后,将实验组cDNA分成两组,分别与两种不同的接头衔接,再与对照组cDNA进行2次消减杂交及2次抑制性聚合酶链反应(PCR),将产物与T/A载体连接,构建cDNA消减文库,并转染大肠杆菌进行文库扩增,随机挑选克隆PCR扩增后进行测序及同源性分析.同时进行表达谱基因芯片技术分析.结果:成功构建人HBV和HCV蛋白反式调节基因差异表达的cDNA消减文库,对HBV和HcV蛋白反式调节的靶基因同时进行基因表达谱芯片的分析.在SSH分析中,文库扩增后均得到200-800bp插入片段.对插入片段测序,并通过生物信息学分析获得其全长基因序列.对于不同的肝炎病毒蛋白反式调节的靶基因类型,以及不同的分析技术研究的结果进行比较分析,发现了一系列的共同调节的靶基因,说明不同的肝炎病毒蛋白反式调节具有共同的作用途径.结论:筛选到的反式调节靶基因,包括一些与细胞生长调节、信号转导、肿瘤免疫发生及细胞凋亡密切相关的蛋白编码基因,推测了HBV和HCV蛋白可能存在的调控机制,有助于阐明HBV和HCV蛋白的反式调节在慢性肝脏疾病的发生发展中的作用.
AIM: To clone and identify human genes transactivated by hepatitis B and C viral proteins via construction of a cDNA subtractive library with suppression subtractive hybridization (SSH) technique and cDNA microarray techniques. METHODS: Suppression subtractive hybridization (SSH) and cDNA microarray techniques were used for screening and cloning of the target genes transactivated by hepatitis B and C viral proteins. The mRNA was isolated from HepG2 cells transfected recombinant vector expressing hepatitis B and C viral proteins and pcDNA3.1(-) empty vector, respectively. SSH and cDNA microarray were employed to analyze the differentially expressed DNA sequence between the two groups. In SSH assay, after restriction enzyme Rsa I digestion, small sizes of cDNAs were obtained. Then tester cDNA was divided into two groups and ligated to the specific adaptor 1 and adaptor 2, respectively. After tester cDNA was hybridized with driver cDNA twice and underwent two times of nested PCR and then was subcloned into T/A plasmid vectors to set up the subtractive library. Amplification of the library was carried out with E. coli strain JM109. The cDNA was sequenced and analyzed in GenBank with Blast search after PCR. RESULTS: The subtractive library of genes transactivated by hepatitis B and C viral proteins was constructed successfully. The up-regulated and down-regulated genes from cDNA microarray assay was conducted for each of the hepatitis B and C viral proteins. The results were compared. CONCLUSION: The obtained sequences may be target genes transactivated by hepatitis B and C viral proteins, among which some genes coding proteins involve cell cycle regulation, signal transduction, tumor immunity and development, and apoptosis.
出处
《世界华人消化杂志》
CAS
2004年第2期327-331,共5页
World Chinese Journal of Digestology
基金
国家自然科学基金攻关项目
No.C03011402
No.C30070689军队"九
五"科技攻关项目
No.98D063军队回国留学人员启动基金项目
No.98H038军队"十
五"科技攻关青年基金项目
No 01Q138军队"十
五"科技攻关面上项目.No.01MB135~~
