TLMV5‘非编码区基因的克隆与序列分析

目的 调查ＴＴＶ阴性的非甲￣庚型肝炎患者中ＴＴＶ－ｌｉｋｅ ｍｉｎｉ ｖｉｒｕｓ（ＴＬＭＶ）感染情况，对ＴＬＭＶ５’非编码区（５’ＮＣＲ）部分基因进行分子克隆与序列分析。方法 采用巢式ＰＣＲ技术检测５３例ＴＴＶ阴性的非甲－庚肝炎患者血清ＴＬＭＶ ＤＮＡ，对ＰＣＲ产物进行克隆、测序和分析。结果 ５３例病例中ＴＬＭＶ ＤＮＡ阳性３７例（６９．８％），对其中８株ＴＬＭＶ基因克隆测序，并与Ｔａｋａｈａｓｈ

Molecular cloning and sequencing of 5

OBJECTIVE: To investigate the TTV- like mini virus (TLMV) infection in Chinese patients with non A-G hepatitis and to analyse sequence of 5' non-coding region (5'NCR)of TLMV. METHODS: TLMV DNA was detected by nested - PCR from 53 serum samples of non A-G hepatitis patients without TTV infection. PCR products were cloned and sequenced. RESULTS: TLMV DNA were positive in 37 of 53 patients (69.8%). The sequence of 5' NCR of 8 TLMV isolates was compared with that reported by Takahashi (GenBank Accession No. ab 026930-026931) and showed nucleotide identity between 64% - 83%. CONCLUSIONS: The results of this study indicated that TLMV infection is common in TTV negative patients with non A-G hepatitis. The 5' NCR sequence of TLMV showed a great degree of diversity. The pathogenicity of TLMV and its relationship to non A-G hepatitis need to be confirmed and further study is required.