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Journal of Clinical Microbiology, 12 1997, 3116-3121, Vol 35, No. 12
SH Goh, Z Santucci, WE Kloos, M Faltyn, CG George, D Driedger and SM Hemmingsen
A previous study (S. H. Goh et al., J. Clin. Microbiol. 34:818-823, 1996)
demonstrated that a 600-bp region of the chaperonin 60 (Cpn60) genes from
various bacterial isolates could be amplified by PCR with a pair of
degenerate primers and that the products could be used as species-specific
probes for Staphylococcus aureus, S. epidermidis, S. haemolyticus, S.
lugdunensis, S. saprophyticus, and S. schleiferi. To further validate the
utility of bacterial Cpn60 genes as universal targets for bacterial
identification (ID), reverse checkerboard chemiluminescent hybridization
experiments were performed with DNA probes from 34 different Staphylococcus
species and subspecies. With the exception of probes from the Cpn60 genes
of S. intermedius and S. delphini, which cross hybridized, all were species
specific. Two subspecies of both S. capitis and S. cohnii were
differentiated from one another, while DNAs from the two S. schleiferi
subspecies cross hybridized. When 40 known Staphylococcus isolates were
tested in a blind experiment by the Cpn60 gene method, 36 strains,
representing six species and one subspecies (S. sciuri, S. caseolyticus, S.
hominis, S. warneri, S. hyicus, S. haemolyticus, and S. capitis subsp.
ureolyticus), were correctly identified. DNA from the four remaining
isolates, known to be S. hyicus bovine strains, failed to hybridize to DNA
from the S. hyicus target strain or any other Staphylococcus species.
However, DNAs from these S. hyicus isolates did cross hybridize with each
other. New DNA sequence data and evidence from previous studies suggest
some genetic divergence between the two groups of S. hyicus isolates. Our
results demonstrate that this Cpn60 gene- based ID method has the potential
to be a basic method for bacterial ID. Studies are in progress to further
validate the utility of this Cpn60 gene system for ID of Staphylococcus and
other genera, including those of slow-growing microorganisms.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Identification of Staphylococcus species and subspecies by the chaperonin 60 gene identification method and reverse checkerboard hybridization [In Process Citation]
Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, Canada.
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