›› 2011, Vol. 38 ›› Issue (1): 47-50.

• 生理生化 • 上一篇    下一篇

奶牛结核分枝杆菌rpoB和katG基因突变与多重耐药的相关性

赵莉,纳玮,周学章,王玉炯   

  1. (宁夏大学西部特色生物资源保护与利用教育部重点实验室,宁夏银川 750021)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2011-01-01 发布日期:2011-01-01
  • 通讯作者: 王玉炯

Cows Mycobacterium tuberculosis rpoB and katG Gene Mutations Associated with Multi-drug Resistance

ZHAO Li, NA Wei, ZHOU Xue-zhang, WANG Yu-jiong   

  1. (Key Lab of Ministry of Education for Protection and Utilization of Special Biological Resources in Western China, Ningxia University, Yinchuan 750021, China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-01-01 Published:2011-01-01

摘要: 本试验旨在研究奶牛结核分枝杆菌rpoB和katG基因突变与耐药性之间的关系。将临床分离的30株牛源结核分枝杆菌,利用噬菌体生物扩增法(phage amplified biologically assay,PhaB)检测其对利福平(RFP)和异烟肼(INH)的药物敏感性,采用聚合酶链式反应—DNA直接测序法(PCR-DS)扩增rpoB和katG基因并测序,分析rpoB和katG基因突变及其耐药相关性。15株表型耐药菌株中4株单耐RFP,PCR产物直接测序后发现3株在rpoB基因531位点发生突变,突变率为75.00%(3/4);9株单耐INH菌株中7株发生突变,6株katG基因315位点基因突变,突变率为85.71%(6/7),1株发现463位点密码子基因突变,突变率为14.29%(1/7);2株耐RFP的同时也对INH耐药,测序发现2株均在rpoB基因的531位点〖JP2〗和katG基因的315位点发生突变。所有菌株均未发现rpoB和katG基因的缺失。rpoB基因531位点和katG基因315位点的突变是RFP和INH产生耐药性的主要机制;检测牛源结核分枝杆菌RFP耐药性的同时可以初步筛选耐多药结核分枝杆菌。

关键词: 结核分枝杆菌; 利福平; 异烟肼; rpoB基因; katG基因; 多重耐药

Abstract: The study of cows Mycobacterium tuberculosis rpoB and katG gene mutations and the relation between drug resistance. Take 30 strains of clinical isolates of M.tuberculosis from cattle, use of phage amplified biologically assay on the drug sensitivity of Rifampicin and isoniazid, polymerase chain reaction-DNA direct sequencing rpoB and katG gene were amplified and sequenced, analysis of rpoB and katG gene mutations and drug resistance associate. The results showed that 15 resistant strains in four were resistant to RFP, three of them found mutations at condon 531 occurred in 75.00%(3/4); 9 single INH-resistant strains of seven mutations,6 isolates mutation at condon 315 occurred in 85.71%(6/7), 1 isolate mutation at condon 463 occurred in 14.29%(1/7); 2 isolates were resistant to RFP and INH, sequencing showed that two were both mutations at condon 531 in the rpoB gene and condon 315 in the katG gene. All strains were not found the deletion of rpoB and katG gene. The main mechanism of RFP and INH drug resistance is mutations at condon 531 in the rpoB gene and condon 315 in the katG gene; while detection of bovine tuberculosis RFP-resistance, it can be initial screening MDR M.tuberculosis.

Key words: Mycobacterium tuberculosis; Rifampicin; isoniazide; rpoB; katG; multi-drug resistant

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