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Vol. 10, Issue 12, 1865-1877, December 2000
Fine-Resolution Physical Mapping of Genomic Diversity in Candida albicans
Hiroji
Chibana,1
Janna L.
Beckerman, and
P.T.
Magee
Department of Genetics, Cell Biology, and Development, University of
Minnesota, St. Paul, Minnesota 55108, USA
It has been suggested that Candida albicans, a diploid
asexual fungus, achieves genetic diversity by genomic rearrangement. This important human pathogen may provide a system in which to analyze
alternate routes to genomic diversity. C. albicans has a
highly variable karyotype; its chromosomes contain a middle repeated
DNA sequence called the Major Repeat Sequence (MRS), composed of
subrepeats HOK, RPS, and RB2. RPS is tandemly repeated while the other
subrepeats occur once in each MRS. Chromosome 7, the smallest of the
eight chromosomes, has been previously mapped. The complete physical
map of this chromosome was used to analyze chromosome 7 diversity in
six strains, including two well-characterized laboratory strains (1006 and WO-1) and four clinical ones. We found four types of events to
explain the genomic diversity: 1) Chromosome length polymorphism (CLP)
results from expansion and contraction of the RPS; 2) reciprocal
translocation occurs at the MRS loci; 3) chromosomal deletion; and (4)
trisomy of individual chromosomes. These four phenomena play an
important role in generating genomic diversity in C. albicans.
1
Corresponding author.
10:1865-1877 ©2000 by Cold Spring Harbor Laboratory Press ISSN 1088-9051/00 $5.00

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