Differential distribution of novel restriction-modification systems in clonal lineages of Neisseria meningitidis

被引:47
作者
Claus, H [1 ]
Friedrich, A [1 ]
Frosch, M [1 ]
Vogel, U [1 ]
机构
[1] Univ Wurzburg, Inst Hyg & Mikrobiol, D-97080 Wurzburg, Germany
关键词
D O I
10.1128/JB.182.5.1296-1303.2000
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Using representational difference analysis, we isolated novel meningococcal restriction-modification (R-M) systems. NmeBI, which is a homologue of the R-M system HgaI of Pasteurella volantium, was present in meningococci of the ET-5 complex and of lineage III. NmeAI was found in serogroup A, ET-37 complex and cluster A4 meningococci. NmeDI was harbored by meningococci of the ET-37 complex and of cluster A4, but not by serogroup A meningococci. Two of the R-M systems, NmeBI and NmeDI, were located at homologous positions between the phenylalanyl-tRNA synthetase genes pheS and pheT, which appeared to be a preferential target for the insertion of foreign DNA in meningococci. The distribution of the three R-M systems was tested with 103 meningococcal strains comprising 49 sequence types. The vast majority of the strains had either NmeBI, NmeAI, or both NmeAI and NmeDI. Using cocultivation experiments, we could demonstrate that NmeBI, which was present in ET-5 complex meningococci, was responsible for a partial restriction of DNA transfer from meningococci of the ET-37 complex to meningococci of the ET-5 complex.
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页码:1296 / 1303
页数:8
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