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Position: Home > Articles > Determination and Identity Analysis of Quinolone Resistance Determining Regions (QRDR) of gyrA and parC Genes of Shigella flexneri Progress in Veterinary Medicine 2002,23 (3) 52-55+64

福氏志贺菌gyrA和parC基因QRDR序列的测定与同源性分析

作  者:
张继瑜;金奇;侯云德
单  位:
病毒基因工程国家重点实验室;中国农业科学院兰州畜牧与兽药研究所
关键词:
福氏志贺菌;动物病原菌;gyrA;parC;同源性;遗传进化
摘  要:
测定了我国痢疾流行病原志贺菌福氏2 a 3 0 1株与喹喏酮类药物耐药性相关的 gyr A( DNA旋转酶 A亚单位 )和 par C(拓扑异构酶IVA亚单位 )基因 ,并将 gyr A和 par C基因QRDR(喹喏酮类药物耐药性决定区 )核苷酸序列与几种动物和人的病原菌进行了同源性和遗传进化比较分析。结果显示 ,志贺菌福氏 2 agyr A和 par C基因 QRDR序列分别与宋内氏志贺菌、大肠杆菌 O1 57、大肠杆菌 K1 2、阴沟肠杆菌、坂口肠道杆菌、鼠伤寒沙门氏菌、副伤寒沙门氏菌、肺炎克氏杆菌、产道克氏杆菌、空肠弯曲杆菌、弗氏柠檬酸杆菌具有显著同源性(均大于 88% ) ,表明 gyr A和 par C是这些细菌中的看家基因 ,推测在各种细菌中具有类似的起源 ,因此对在不同细菌之间进行喹喏酮类药物耐药性的研究非常有利。 QRDR的遗传进化分析表明 ,同属或相近属细菌 gyr A或 par CQRDR的遗传距离明显接近 ,其中与大肠杆菌属的距离最近 ,认为可列到同一个属 ,结果有力支持了近年提出的大肠杆菌与志贺菌属于同族细菌的理论。研究对理解喹喏酮类药物耐药性的分子机理及其与细菌遗传进化之间的关系具有重要意义
译  名:
Determination and Identity Analysis of Quinolone Resistance Determining Regions (QRDR) of gyrA and parC Genes of Shigella flexneri
作  者:
ZHANG Ji yu 1, 2 , JIN Qi 2,HOU Yun de 2 (1. Lanzhou Institute of Animal Science & Veterinary Pharmaceutics,Chinese Academy of Agricultural Sciences, Lanzhou 730050, China; 2. State Key Laboratory for Molecular Virology and Genetic Engineering,
关键词:
S. flexneri; animal pathogens;gyrA;parC;identity;genetics and evolution
摘  要:
Combing with the genome research project of S. flexneri 2a strain 301, gyrA (DNA gyrase subunit A ) and parC (topoisomerase IV subunit A) genes were determined. Further more, Identity and genetic analysis of the QRDR sequences between S. flexneri and other human and animal pathogens were carried out. It showeded that the identity of QRDR nucleotides of gyrA and parC between S. flexneri and S. sonnei, E. coli O157, E. coli K12, S.typhi, S. paratyphi, E. cloacae, E. sakazakii, K. pneumoniae, K. oxytoc, C. jejuni and C. freundii are significant (all above 88 per cent), indicating gyrA and parC are housekeeping genes and have a same origin in these pathogens and are useful for quinolone resistance research. Genetics analysis showed that the genetic distances of bacteria in same genus are similar. The results also confirmed the recent suggestion that bacteria in genus Shigella would be taxoned into Escherichia tribe. Therefor, the research is important for recognition of the molecular mechanism of quinolone resistance and the relationship of drug resistance and genetics evolution of bacteria.

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