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Journal of Clinical Microbiology, Sep 1997, 2348-2358, Vol 35, No. 9
C Pujol, S Joly, SR Lockhart, S Noel, M Tibayrenc and DR Soll
Randomly amplified polymorphic DNA (RAPD) analysis, multilocus enzyme
electrophoresis (MLEE), and Southern blot hybridization with moderately
repetitive DNA probes have emerged as effective fingerprinting methods for
the infectious fungus Candida albicans. The three methods have been
compared for their capacities to identify identical or highly related
isolates, to cluster weakly related isolates, to discriminate between
unrelated isolates, and to assess microevolution within a strain. By
computing similarity coefficients between 29 isolates from three cities
within the continental United States, strong concordance of the results is
demonstrated for RAPD analysis, MLEE, and Southern blot hybridization with
the moderately repetitive probe Ca3, and weaker concordance of the results
is demonstrated for these three fingerprinting methods and Southern blot
hybridization with the moderately repetitive probe CARE2. All methods were
also demonstrated to be able to resolve microevolution within a strain,
with the Ca3 probe exhibiting the greatest resolving power. The strong
correlations demonstrated between polymorphic markers assessed by the four
independent fingerprinting methods and the nonrandom association between
loci demonstrated by RAPD analysis and MLEE provide evidence for strong
linkage disequilibrium and a clonal population structure for C. albicans.
In addition, a synapomorphic allele, Pep-3A, was found to be present in all
members of one of the three clusters discriminated by RAPD analysis, MLEE,
and Ca3 fingerprinting, supporting the concordance of the clustering
capacities of the three methods, the robustness of the clusters, and the
clonal nature of the clusters.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Parity among the randomly amplified polymorphic DNA method, multilocus enzyme electrophoresis, and Southern blot hybridization with the moderately repetitive DNA probe Ca3 for fingerprinting Candida albicans
Department of Biological Sciences, University of Iowa, Iowa City 52242, USA.
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