改进的锚定反转录PCR法克隆中国人庚型肝炎病毒3′末端基因

CLONING OF HGV 3′ END GENE FROM CHINESE WITH MODIFIED ANCHORED RTPCR

应用改进的锚定反转录ＰＣＲ（ａｎｃｈｏｒｅｄＲＴ－ＰＣＲ）法，在总ＲＮＡ的３′端“加尾”，Ｏｌｉｇｏｔｅｘ提纯ｐｏｌｙ（Ａ）＋ｍＲＮＡ，Ｏｌｉｇｏｄ（Ｔ）－ａｎｃｈｏｒ引物合成第１链ｃＤＮＡ，ａｎｃｈｏｒ引物及特异引物进行“半巢式”ＰＣＲ，从献血员血清中扩增出ＨＧＶ３′末端基因片段。序列分析结果表明：此中国株ＨＧＶ３′末端基因序列与美国株存在较大差异，但阅读框架相似。用此方法克隆单链ＲＮＡ病毒基因组的３′末端。由于许多动物病毒和９０％以上的植物病毒均为单链ＲＮＡ基因组，故该技术也可应用于其它病毒基因组未知末端的基因克隆。

The 3′ end gene of hepatitis G virus(HGV) was cloned from a HGV positive blood donor from Gu′an County, Hebei Province with modified anchored RTPCR. The results of DNA sequencing showed that the determined sequences were different from that of American HGV strains, but their readingframes were similar. It was suggested that this modified anchored RTPCR technique could be applied to cloning other unknown end genes of animal or plant RNA viruses.