中国寄生虫学与寄生虫病杂志 ›› 2002, Vol. 20 ›› Issue (4): 2-200.

• 论著 • 上一篇    下一篇

杜氏利什曼原虫平原和荒漠疫区分离株LACK基因克隆及序列分析

马莹;胡孝素;王雅静;王子龙
  

  1. 四川大学华西基础医学和法医学院寄生虫学教研室 成都610044
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2002-08-30 发布日期:2002-08-30

Cloning and Sequence Analysis of LACK Gene of Leishmania Donovani Isolates from Plain and Desert Foci of China

MA Ying;HU Xiao-su;WANG Ya-jing;WANG Zi-long   

  1. Department of Parasitology;School of Preclinical and Forensic Medicine;Sichuan University;Chengdu 610044
  • Received:1900-01-01 Revised:1900-01-01 Online:2002-08-30 Published:2002-08-30

摘要:   目的 测定我国平原疫区和荒漠疫区杜氏利什曼原虫分离株活性蛋白激酶 C受体同源物 (L ACK)基因序列 ,并与山丘疫区分离株及国外利什曼原虫分离株进行比较。 方法 应用 RT- PCR扩增 L ACK基因 ,将其克隆入p UC18载体后用双脱氧链末端终止法测序 ,并与 Gen Bank中相关数据进行比较。 结果 用 RT- PCR成功扩增出约95 0 bp的 L ACK基因片段 ,测序结果表明其片段大小均为 94 2 bp,与 Gen Bank中多种利什曼原虫 L ACK基因的核苷酸序列一致性达 97%以上。我国山丘、平原和荒漠 3个不同疫区杜氏利什曼原虫分离株的 L ACK基因序列的一致性达95 %以上。 结论 获得了我国平原和荒漠疫区杜氏利什曼原虫 L ACK基因序列。我国 3个不同疫区杜氏利什曼原虫分离株的 L ACK基因具有高度同源性。

关键词: 利什曼原虫, LACK, 克隆, 序列分析

Abstract:  Objective To determine the nucleotide sequence of the LACK
(Leishmania homologue of receptors for activated protein kinase C)
gene of Leishmania donovani isolates from plain foci (L.d SD1) and desert
foci (L.d XJ771) of China, and to find out the difference of the sequence of
LACK gene with other Leishimania spp. and also the isolate from hill foci of China.. Methods. The LACK genes of L.d SD1 and L.d XJ771 were amplified by RT-PCR and cloned into pUC18 vector respectively, sequenced by the dideoxy chain termination method, then analyzed and compared with that of other isolates.. Results . The LACK genes of the two isolates were successfully cloned. Both of the 2 fragments were 942 bp in length. Comparison
of the two nucleotide sequences with that of other Leishmania spp. in GenBank showed that the identities were more than 97%, and the identities of the nucleotide sequences of LACK genes of the three L.d isolates from plain, desert and hill foci of China were more than 95%.. Conclusion .
High identities exist among the nucleotide sequences of LACK genes of the three L.d isolates from the three foci of China.

Key words: Leishmania donovani, LACK, gene cloning, gene sequencing