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Candida albicans is an asexual fungus and as such must rely on mechanisms other than sexual recombination to generate genetic diversity. Retrotransposons are ubiquitous genetic elements known to generate multiple types of genomic alterations. We have further investigated the nature of the retrotransposon-like element Tca1 in C. albicans. Tca1 is present at two loci in strain SC5314. Both loci have now been cloned, and one element was sequenced in its entirety. This element was flanked by alpha elements, or long terminal repeats (LTRs), and contained an intervening region of 5,614 bp. The intervening region was highly degenerate and contained no extended open reading frames, indicating that Tca1 is not a functional element. Partial sequence determination demonstrated that the elements from the two loci were nearly identical. Genetic manipulation of the elements showed that both loci were heterozygous for Tca1, that both were transcriptionally active, and that deletion of both had no effect on growth rate or germ tube formation. Thus, it is unclear why this nonfunctional, highly degenerate element has been maintained in many clinical isolates.

Tca1, the Retrotransposon-Like Element of Candida albicans , Is a Degenerate and Inactive Element