Genetic and phenotypic intra-species variation in Candida albicans.

Abstract:

:Candida albicans is a commensal fungus of the human gastrointestinal tract and a prevalent opportunistic pathogen. To examine diversity within this species, extensive genomic and phenotypic analyses were performed on 21 clinical C. albicans isolates. Genomic variation was evident in the form of polymorphisms, copy number variations, chromosomal inversions, subtelomeric hypervariation, loss of heterozygosity (LOH), and whole or partial chromosome aneuploidies. All 21 strains were diploid, although karyotypic changes were present in eight of the 21 isolates, with multiple strains being trisomic for Chromosome 4 or Chromosome 7. Aneuploid strains exhibited a general fitness defect relative to euploid strains when grown under replete conditions. All strains were also heterozygous, yet multiple, distinct LOH tracts were present in each isolate. Higher overall levels of genome heterozygosity correlated with faster growth rates, consistent with increased overall fitness. Genes with the highest rates of amino acid substitutions included many cell wall proteins, implicating fast evolving changes in cell adhesion and host interactions. One clinical isolate, P94015, presented several striking properties including a novel cellular phenotype, an inability to filament, drug resistance, and decreased virulence. Several of these properties were shown to be due to a homozygous nonsense mutation in the EFG1 gene. Furthermore, loss of EFG1 function resulted in increased fitness of P94015 in a commensal model of infection. Our analysis therefore reveals intra-species genetic and phenotypic differences in C. albicans and delineates a natural mutation that alters the balance between commensalism and pathogenicity.

journal_name

Genome Res

journal_title

Genome research

authors

Hirakawa MP,Martinez DA,Sakthikumar S,Anderson MZ,Berlin A,Gujja S,Zeng Q,Zisson E,Wang JM,Greenberg JM,Berman J,Bennett RJ,Cuomo CA

doi

10.1101/gr.174623.114

subject

Has Abstract

pub_date

2015-03-01 00:00:00

pages

413-25

issue

3

eissn

1088-9051

issn

1549-5469

pii

gr.174623.114

journal_volume

25

pub_type

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