中国寄生虫学与寄生虫病杂志 ›› 2000, Vol. 18 ›› Issue (3): 5-145.

• 论著 • 上一篇    下一篇

基于磷酸丙糖异构酶基因序列的蓝氏贾第鞭毛虫分子系统发育的研究

李继红 1;卢思奇2;张亚平1;王凤芸2;文建凡1
  

  1. 中国科学院昆明动物研究所细胞与分子进化开放研究实验室!昆明650223 首都医科大学细胞生物学系寄生虫学教研室!北京100054
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2000-06-30 发布日期:2000-06-30

MOLECULAR PHYLOGENY OF GIARDIA LAMBLIA BASED ON TRIOSE PHOSPHATE ISOMERASE (tim) GENE SEQUENCE

LI Ji hong 1;LU Si qi 2;ZHANG Ya ping 1;WANG Feng yun 2;WEN Jian fan 1

  

  1. 1 Key Laboratory of Cellular and Molecular Evolution;Chinese Academy of Sciences;Kunming 650233 2 Department of Cell Biology;Capital University of Medical Science,Beijing 100054
  • Received:1900-01-01 Revised:1900-01-01 Online:2000-06-30 Published:2000-06-30

摘要:   [目的 ]探讨蓝氏贾第鞭毛虫种内系统发育及遗传多样性。 [方法 ]对不同来源虫株的磷酸丙糖异构酶(tim)基因进行 PCR扩增、序列测定后 ,用简约法和 NJ法构建分子系统树进行系统学分析。 [结果 ]在所测序列中共有 12 4个位点存在变异 (2 3% ) ,且大多数为发生在第三密码子的同义突变 ,两种构树方法所得两树的分枝结构相似 ,均将受试的 16株蓝氏贾第鞭毛虫分为明显的两组。 [结论 ]tim基因可作为研究蓝氏贾第鞭毛虫群体遗传结构一个有效的遗传标记

关键词: 蓝氏贾第鞭毛虫, 磷酸丙糖异构酶, 遗传标记, 系统学, 序列分析

Abstract:  Objective] To investigate the intraspecies phylogeny and genetic diversity of G. lamblia . [Methods] Total genomic DNA was extracted and partial fragments of tim gene were amplified by PCR. All the nucleotide sequences were analyzed by means of phylogenetic analysis, which were constructed with pasimony and N J methods. [Results] A total of 124 variable sites (23% of the total sequences detected) were defined, most of which were found at the silent sites of codons. Two similar phylogenetic trees were constructed, subdividing 16 isolates into two groups. [Conclusion] The genetic diversity of G. lamblia appear to be little affected by both the host and geography, while natural selection might play an important role at the DNA molecular evolution level of tim gene. The tim gene may be considered to be a very useful genetic marker of the population genetic structure of G. lamblia .

Key words: Giardia lamblia, triose phosphates isomerase, sequence analysis, phylogeny, genetic marker.