霍乱弧菌及其它致病弧菌分子遗传特征和DNA多态性研究
The inherent characteristics and DNA polymorphism of Vibrio cholerae and other vibrios
目的探讨霍乱弧菌和其它致病弧菌分子遗传特征及相互关系.方法用聚合酶链反应(Polymerase chain reaction; PCR)、DNA 序列分析、随机扩增多态性 DNA (Randomly amplified polymorphic DNA; RAPD)和平均链锁聚类分析,对3株O139群霍乱弧菌、3株O1群 El Tor型、4株古典型和3株副溶血等致病弧菌进行检测.结果 O139群霍乱弧菌和O1群含有相同的霍乱肠毒素(CTX)A2-B亚单位基因, 核苷酸序列同源性为97.1%-98.9%.RAPD 将不同弧菌分成4类;即①O139群和El Tor型、②古典型、③副溶血和创伤弧菌及④河弧菌.O139群与O1群El Tor型DNA指纹图谱几乎完全一致,平均链锁距离为0,与古典型相似,平均链锁距离为2.07. 与副溶血等致病弧菌差别较大,平均链锁距离为6.76-8.54.结论 O139群霍乱弧菌与O1群El Tor型遗传特征相同,前者很可能由El Tor型进化而来.副溶血与创伤弧菌也具有相同遗传特征.霍乱弧菌和其它致病弧菌遗传特征表现出多态性.
更多Objective To investigate the inherent characteristics of Vibrio cholerae (V. cholerae) and other vibrios and their relationship. Methods Polymerase chain reaction (PCR), DNA sequence analysis, randomly amplified polymorphic DNA (RAPD) analysis and average linkage cluster analysis were used to study 3 isolates of V. cholerae strains O139, three isolates O1 biotype El Tor, four isolates O1 biotype classical and 3 other vibrios.Conclusion V. cholerae and other vibrios are polymorphic in inherent characteristics. The inherent characteristics of V. cholerae O139 are the same as El Tor biotype. O139 may have evolved from the El Tor biotype. The inherent characteristics of vibrio paraheamolyticus are the same as vibrio vulnificus.
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