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Volume 153, Issue 3

tDNA locus polymorphism and ecto-chromosomal DNA insertion hot-spots are related to the phylogenetic group of strains Free

Abstract

tRNA-encoding genes (tDNA) are known hot-spots for the integration of ecto-chromosomal DNA (ECDNA) including genomic islands. However, only a few loci are currently known to be targeted by such insertions in . A PCR-based screening of tDNA integrity was therefore performed on a collection of strains in order to identify tDNA loci that are most frequently intact and those that are preferred ECDNA insertion sites. It was shown that only a subset of tDNAs were hot-spots for ECDNA insertions, and that the majority of loci were never targeted by such insertions. Polycistronic tDNAs, highly transcribed tDNAs or tDNAs encoding tRNAs recognizing frequently used codons were generally not targeted by ECDNA insertions. Most interestingly, strains of different ECOR groups showed different patterns of tDNA loci polymorphism. More subtle differences were also observed between strains of different pathotypes.

  • Received:
  • Accepted:
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  • Published Online:
Keyword(s): APEC, avian pathogenic E. coli , EAEC, enteroaggregative E. coli , ECDNA, ecto-chromosomal DNA , EHEC, enterohaemorrhagic E. coli , EIEC, enteroinvasive E. coli , EPEC, enteropathogenic E. coli , ETEC, enterotoxigenic E. coli , ExPEC, extra-intestinal pathogenic E. coli of human origin , IPEC, intestinal pathogenic E. coli , MFCA, multiple factorial analysis of correspondences , NMEC, newborn meningitis E. coli , NP, non-pathogenic E. coli and UPEC, uropathogenic E. coli
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2007-03-01
2024-04-16
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tDNA locus polymorphism and ecto-chromosomal DNA insertion hot-spots are related to the phylogenetic group of Escherichia coli strains
Microbiology 153, 826 (2007); https://doi.org/10.1099/mic.0.2006/001958-0
/content/journal/micro/10.1099/mic.0.2006/001958-0
/content/journal/micro/10.1099/mic.0.2006/001958-0
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