Molecular epidemiology of Neisseria gonorrhoeae:: sequence analysis of the porβ gene confirms presence of two circulating strains

被引:45
作者
Unemo, M [1 ]
Olcén, P
Berglund, T
Albert, J
Fredlund, H
机构
[1] Orebro Univ Hosp, Natl Reference Lab Pathogen Neisseria, Dept Clin Microbiol, SE-70185 Orebro, Sweden
[2] Orebro Univ Hosp, Unit Infect Dis Control, Dept Clin Microbiol, SE-70185 Orebro, Sweden
[3] Karolinska Inst, Dept Med Epidemiol, S-10401 Stockholm, Sweden
[4] Huddinge Univ Hosp, Karolinska Inst, Dept Clin Virol, Stockholm, Sweden
[5] Swedish Inst Infect Dis Control, Unit Infect Dis Epidemiol, Solna, Sweden
关键词
D O I
10.1128/JCM.40.10.3741-3749.2002
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
The phenotypic and genotypic characteristics of Neisseria gonorrhoeae strains fluctuate over time both locally and globally, and highly discriminative and precise characterization of the strains is essential. Conventional characterization of N. gonorrhoeae strains for epidemiological purposes is mostly based on phenotypic methods, which have some inherent limitations. In the present study sequence analysis of porB1b gene sequences was used for examination of the genetic relationships among N. gonorrhoeae strains. Substantial genetic heterogeneity was identified in the porB genes of serovar IB-2 isolates (8.1% of the nucleotide sites were polymorphic) and serovar IB-3 isolates (5.2% of the nucleotide sites were polymorphic) as well as between isolates of different serovars. The highest degree of diversity was identified in the gene segments encoding the surface-exposed loops of the mature PorB protein. Phylogenetic analysis of the porB1b gene sequences confirmed previous findings that have indicated the circulation of one N. gonorrhoeae strain each of serovar IB-2 and serovar IB-3 in the Swedish community. These strains caused the majority of the cases in two domestic core groups comprising homosexual men and young heterosexuals, respectively, and were also detected in other patients. The phylogenetic analyses of porB gene sequences in the present study showed congruence, but not complete identity, with previous results obtained by pulsed-field gel electrophoresis of the same isolates. In conclusion, porB gene sequencing can be used as a molecular epidemiological tool for examination of genetic relationships among emerging and circulating N. gonorrhoeae strains, as well as for confirmation or discrimination of clusters of gonorrhea cases.
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页码:3741 / 3749
页数:9
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