中国寄生虫学与寄生虫病杂志 ›› 2007, Vol. 25 ›› Issue (2): 6-108.

• 论著 • 上一篇    下一篇

海南恶性疟原虫pfcrt等位基因多态性的单体型研究

王安平1;高琪2;顾亚萍2;王善青3;王光泽3;林世干3;蒙锋3   

  1. 1 常州市疾病预防控制中心, 常州 213003; 2 江苏省寄生虫病防治研究所, 无锡 214064; 3 海南省疾病预防控制中心, 海口 570203
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-04-30 发布日期:2007-04-30

Study on the Haplotypes of pfcrt Polymorphism from Hainan Province

WANG An-ping1;GAO Qi2;GU Ya-ping2;WANG Shan-qing3;WANG Guang-ze3;LIN Shi-gan3;MENG Feng3   

  1. 1 Changzhou Center for Disease Prevention and Control,Changzhou 213003,China;2 Jiangsu Provincial Institute of Parasitic Diseases, Wuxi 214064, China;3 Hainan Provincial Center for Disease Prevention and Control, Haikou 570203, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-04-30 Published:2007-04-30

摘要: 目的 建立恶性疟原虫pfcrt(Plasmodium falciparum chloroquine resistant transporter)等位基因多态性的单体型的研究方法,比较我国海南省与东南亚及非洲地区恶性疟原虫的pfcrt等位基因多态性的单体型的特征。 方法 来自海南省19份恶性疟滤纸血样提取DNA,通过巢式PCR反应,扩增出包含第72~76、97位密码子的基因片段,根据限制性片段长度多态性(RFLP)分析结果,各选取6份突变型和野生型PCR产物进行DNA测序,检测第72~76、97位密码子序列,从而建立并分析我国海南省恶性疟pfcrt等位基因的单体型。 结果 19份滤纸血样本提取的DNA全部扩增出1条195 bp的片段,酶切消化后,有11份出现1条100 bp左右的酶切片段,为野生型pfcrt等位基因,其余8份为1条195 bp的片段,为突变型。基因序列分析发现,野生型pfcrt等位基因的第72~76位密码子单体型为CVMNK,突变型为CVIET,第97位密码子未发现突变。 结论 我国海南省氯喹抗药性恶性疟原虫pfcrt等位基因第72~76位密码子的单体型与东南亚和非洲地区抗氯喹恶性疟原虫相应单体型一致。

关键词: 恶性疟原虫, 氯喹抗药性, pfcrt基因, 巢式PCR, 单体型

Abstract: Objective To develop a method for comparing the haplotypes of pfcrt polymorphism of Hainan Province with those from other areas of the world. Methods Nested PCR was used to amplify the polymorphic region including codon 72 to 76 and 97 of pfcrt gene. The PCR products were digested by ApoI restriction endonuclease to determine the allelic types. According to the allelic types, 6 products from each of mutant type and wild type were sequenced to analyze the haplotypes of pfcrt polymorphism. Results Bands in size of 195 bp appeared in all 19 samples. After ApoI digestion, 11 samples contained one ApoI site when codon 76 of the pfcrt gene codes for lysine(K76), which were visualized by the presence of 98 bp and 97 bp restriction fragments. The DNA sequencing revealed that 6 samples of cloroquine resistant P. falciparum carried pfcrt alleles encoding an amino acid haplotype of CVIET (residues 72-76), and the haplotype of CVMNK was found in other 6 samples with wild type pfcrt gene. Conclusion Haplotypes of pfcrt polymorphism from Hainan were the same as those from southeast Asia and Africa.

Key words: Plasmodium falciparum, Chloroquine resistance, pfcrt gene, Nested PCR, Haplotype