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Journal of Clinical Microbiology, January 2000, p. 158-164, Vol. 38, No. 1
0095-1137/0/$04.00+0
Identification of Nocardia Species by
Restriction Endonuclease Analysis of an Amplified Portion of the 16S
rRNA Gene
Patricia S.
Conville,*
Steven H.
Fischer,
Charles P.
Cartwright,
and
Frank G.
Witebsky
Microbiology Service, Clinical Pathology
Department, Warren Grant Magnuson Clinical Center, National
Institutes of Health, Bethesda, Maryland
Received 2 July 1999/Returned for modification 30 August
1999/Accepted 28 September 1999
Identification of clinical isolates of Nocardia to the
species level is important for defining the spectrum of disease
produced by each species and for predicting antimicrobial
susceptibility. We evaluated the usefulness of PCR amplification of a
portion of the Nocardia 16S rRNA gene and subsequent
restriction endonuclease analysis (REA) for species identification.
Unique restriction fragment length polymorphism (RFLP) patterns were
found for Nocardia sp. type strains (except for the
N. asteroides type strain) and representative isolates of
the drug pattern types of Nocardia asteroides (except for
N. asteroides drug pattern type IV, which gave
inconsistent amplification). A variant RFLP pattern for Nocardia nova was also observed. Twenty-eight clinical isolates
were evaluated both by traditional biochemical identification and by
amplification and REA of portions of the 16S rRNA gene and the 65-kDa
heat shock protein (HSP) gene. There was complete agreement among the
three methods on identification of 24 of these isolates. One isolate gave a 16S rRNA RFLP pattern consistent with the biochemical
identification but was not identifiable by its HSP gene RFLP patterns.
Three isolates gave 16S rRNA RFLP patterns which were inconsistent with the identification obtained by both biochemical tests and HSP gene
RFLP; sequence analysis suggested that two of these isolates may belong
to undefined species. The PCR and REA technique described appears
useful both for the identification of clinical isolates of
Nocardia and for the detection of new or unusual species.
*
Corresponding author. Mailing address: Microbiology
Service, Clinical Pathology Department, National Institutes of Health, 10 Center Drive, MSC 1508, Bethesda, MD 20892-1508. Phone: (301) 496-4433. Fax: (301) 402-1886. E-mail: pconville{at}nih.gov.

Present address: Hennepin County Medical Center, Minneapolis, MN
55415.
Journal of Clinical Microbiology, January 2000, p. 158-164, Vol. 38, No. 1
0095-1137/0/$04.00+0
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