Echeita M A, Usera M A
Centro Nacional de Microbiología, Instituto de Salud Carlos III, Madrid, Spain.
J Clin Microbiol. 1998 Jul;36(7):2123-6. doi: 10.1128/JCM.36.7.2123-2126.1998.
Salmonella enterica serotype Typhi strains belonging to eight different outbreaks of typhoid fever that occurred in Spain between 1989 and 1994 were analyzed by ribotyping and pulsed-field gel electrophoresis. For three outbreaks, two different patterns were detected for each outbreak. The partial digestion analysis by the intron-encoded endonuclease I-CeuI of the two different strains from each outbreak provided an excellent tool for examining the organization of the genomes of epidemiologically related strains. S. enterica serotype Typhi seems to be more susceptible than other serotypes to genetic rearrangements produced by homologous recombinations between rrn operons; these rearrangements do not substantially alter the stability or survival of the bacterium. We conclude that genetic rearrangements can occur during the emergence of an outbreak.
对1989年至1994年间在西班牙发生的八次不同伤寒热暴发中分离出的肠炎沙门氏菌伤寒血清型菌株进行了核糖体分型和脉冲场凝胶电泳分析。在三次暴发中,每次暴发均检测到两种不同的模式。对每次暴发中两种不同菌株进行内含子编码的内切酶I-CeuI的部分消化分析,为研究流行病学相关菌株的基因组组织提供了一个极好的工具。肠炎沙门氏菌伤寒血清型似乎比其他血清型更容易受到rrn操纵子之间同源重组产生的基因重排的影响;这些重排不会实质性地改变细菌的稳定性或生存能力。我们得出结论,在暴发出现期间可能会发生基因重排。