Identification of Campylobacter jejuni and C. coli using the rpoB gene and a cryptic DNA fragment from C. jejuni
Por:
Bustamante V.H., Puente J., Sánchez-López F., Bobadilla M., Calva E.
Publicada:
1 ene 1995
Resumen:
Campylobacter jejuni (Cj) and C. coli (Cc) clinical isolates, obtained from three different sources, were characterized using two Cj DNA probes, CJ01 and CJ02. These probes were selected at random by virtue of their stability in Escherichia coli (Ec). CJ01 hybridized specifically with DNA from Cj reference strains, but not with DNA from Cc, C. lari (Cl) nor C. fetus (Cf) reference strains. Using clinical isolates characterized by genome-genome hybridization and biotype, CJ01 hybridized with DNA derived from all Cj strains. However, DNA from four out of ten Cc strains, from three different sources, also hybridized with CJ01, suggestive of this region being heterogeneous between clinical isolates of both species. The nucleotide sequence analysis of CJ01 reveals two incomplete open reading frames (ORFs) that did not show significant homology with any other known sequences. CJ02 hybridized specifically with DNA from Cj and Cc reference strains, but not with DNA from Cl and Cf reference strains. The specificity and sensitivity were maintained upon hybridization with DNA from 31 clinical isolates. CJ02 has an uninterrupted ORF whose deduced amino-acid sequence showed extensive homology with the central region of the Ec and Salmonella typhimurium (St) RNA polymerase ? subunits (52 and 66% similarity, respectively). The most conserved segments correspond to putative functional domains. © 1995.
Filiaciones:
Bustamante V.H.:
Department of Molecular Microbiology, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Morelos 62271, Mexico
Puente J.:
Department of Molecular Microbiology, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Morelos 62271, Mexico
Sánchez-López F.:
Department of Molecular Microbiology, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Morelos 62271, Mexico
Bobadilla M.:
Department of Molecular Microbiology, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Morelos 62271, Mexico
Calva E.:
Department of Molecular Microbiology, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Cuernavaca, Morelos 62271, Mexico
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