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- W2726052546 abstract "During adaptation to host environments, many microorganisms alter their cell surface. One mechanism for doing so is variation in the number of amino acid repeats in cell surface proteins encoded by hypermutable DNA tandem repeats. In the yeast Candida albicans, an opportunistic human pathogen, the gene SSR1 encodes a GPI-anchored cell wall protein with a structural role. It contains two regions consisting of tandem repeats, almost exclusively encoding the amino acid pair Ser-Ala. As expected, the repeat regions make SSR1 highly mutable. New SSR1 alleles arose with a frequency of 1.11×10−4 per cell division in serially propagated cells. We also observed a large number (25) of SSR1 alleles with different repeat lengths in a survey of 131 isolates from a global strain collection. C. albicans is diploid, and combinations of these allele generated 41 different SSR1 genotypes. In both repeat regions, nonsynonymous mutations were largely restricted to one particular repeat unit. Two very similar allele combinations were largely restricted to one clade, clade 1. Each combination was present in ~30% of 49 infection-causing clade 1 strains, but one was rare (2%), the other absent in 46 infection-causing strains representing the remainder of the species (P < 0.00018 and 0.00004; Fisher’s exact test). These results indicate that both repeat regions are under selection and that amino acid repeat length polymorphisms generate Ssr1 protein variants most suitable for specific genetic backgrounds. One of these two allele combinations was 5.51 times more frequent, the other 1.75 times less frequent in 49 clade 1 strains that caused disease than in 36 commensal clade 1 strains (P = 0.0105; Chi2 test). This indicates that insertion and deletion of repeats not only generates clade-optimized Ssr1p variants, but may also assist in short-term adaptation when C. albicans makes the transition from commensal to pathogen." @default.
- W2726052546 created "2017-07-14" @default.
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- W2726052546 date "2017-06-29" @default.
- W2726052546 modified "2023-09-23" @default.
- W2726052546 title "Highly mutable tandem DNA repeats generate a cell wall protein variant more frequent in disease-causing Candida albicans isolates than in commensal isolates" @default.
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- W2726052546 doi "https://doi.org/10.1371/journal.pone.0180246" @default.
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