摘要
目的 筛选并克隆丙型肝炎病毒 (HCV)非结构蛋白 5A(NS5A)反式激活新型靶基因。方法 以HCVNS5A表达质粒pcD NA3.1( ) NS5A转染HepG2细胞 ,以空载体pcDNA3.1( )为平行对照 ,提取mRNA并进行抑制性消减杂交分析 ,应用生物信息学方法对所获基因片段序列进行分析发现 ,其中有新型基因片段 ,与GenBank中注册的已知功能基因序列没有同源性。通过序列同源性搜索、比对和电子拼接 ,根据基因起始密码子的Kozak规则和终止密码子下游保守的多聚腺苷酸信号序列 ,确定新型基因序列。从转染了pcD NA3.1( ) NS5A的HepG2细胞提取总RNA ,以逆转录聚合酶链反应 (RT PCR)技术扩增 ,获得阳性克隆之后 ,进行鉴定并对克隆的基因及其编码产物的序列进行分析。结果 该新基因的编码序列全长为 15 72nt,编码产物由 5 2 4aa组成 ,并测序证实 ,命名为NS5ATP3,在GenBank中注册 ,注册号为AF5 2 936 4。结论 分子生物学技术与生物信息学技术相结合 ,发现并鉴定、克隆了HCVNS5A反式激活作用的新型靶基因NS5ATP3。
Objective To screen and clone the target genes transactivated by nonstructural protein 5A (NS5A) of hepatitis C virus (HCV). Methods The mRNA was isolated from HepG2 cells transfected with pcDNA3.1(-)-NS5A and pcDNA3.1(-) empty vector, respectively. Suppression subtractive hybridization (SSH) method was employed to analyze the differentially expressed DNA sequence between the two groups. The obtained sequences were searched for homologous DNA sequence from GenBank. The new gene with no homology with known genes in this database was confirmed, and electric polymerase chain reaction was conducted for cloning the full-length DNA of the new gene and in conjunction with Kozak rule and the terminus of polyadenyl signal sequence. The reverse transcription PCR (RT-PCR) was used to amplify the new gene from mRNA of HepG2 cell as the template. The coding sequence of the new gene was deduced according to the nucleotide sequence. Results A new gene with unknown function was named as NS5ATP3. The nucleotide sequence of the NS5ATP3 gene and its corresponding amino acid have been determined, which contained 1 572nt and 524aa. The sequence of the NS5ATP3 gene was deposited into GenBank, with the accession number AF529364. Conclusions NS5ATP3 gene transactivated by HCV NS5A protein was cloned and identified successfully by combining molecular biological technology and bioinformatics technique. These results will pave the way for the study of the molecular mechanism of the transactivating effects of HCV NA5A protein and the development of new therapy for chronic hepatitis C.
出处
《解放军医学杂志》
CAS
CSCD
北大核心
2004年第5期383-385,共3页
Medical Journal of Chinese People's Liberation Army
基金
军队回国留学人员启动基金 (编号 98H0 38)
国家自然科学基金攻关项目 (编号C0 30 1 1 4 0 2 0
C30 0 70 689)
军队"九五"科技攻关项目 (编号98D0 63)
军队"十五"科技攻关青年基金项目 (编号 0 1Q1 38)资助课题
