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. 1993 Oct;175(20):6637–6651. doi: 10.1128/jb.175.20.6637-6651.1993

Construction of an SfiI macrorestriction map of the Candida albicans genome.

W S Chu 1, B B Magee 1, P T Magee 1
PMCID: PMC206775  PMID: 8407841

Abstract

The opportunistic fungal pathogen, Candida albicans, is diploid as usually isolated and has no apparent sexual cycle. Genetic analysis has therefore been very difficult. Molecular genetics has yielded important information in the past few years, but it too is hampered by the lack of a good genetic map. Using the well-characterized strain 1006 and strain WO-1, which undergoes the white-opaque phenotypic transition, we have developed a genomic restriction map of C. albicans with the enzyme SfiI. There are approximately 34 SfiI restriction sites in the C. albicans genome. Restriction fragments were separated by pulsed-field electrophoresis and were assigned to chromosomes by hybridization of complete and partial digests with known chromosome-specific probes as well as by digestion of isolated chromosomes. Telomeric fragments were identified by hybridization with a telomere-specific probe (C. Sadhu, M.J. McEachern, E.P. Rustchenko-Bulgac, J. Schmid, D.R. Soll, and J.B. Hicks, J. Bacteriol. 173:842-850, 1991). WO-1 differs from 1006 in that it has undergone three reciprocal chromosomal translocations. Analysis of the translocation products indicates that each translocation has occurred at or near an SfiI site; thus, the SfiI fragments from the two strains are similar or identical. The tendency for translocation to occur at or near SfiI sites may be related to the repeated sequence RPS 1, which contains four such sites and could provide homology for ectopic pairing and crossing over. The genome size of both strains is about 16 to 17 megabases, in good agreement with previous determinations.

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