Cited by 20Fungal and yeast genetics researchAntifungal resistance and susceptibilityYeasts and Rust Fungi Studies

Loss of Heterozygosity at an Unlinked Genomic Locus Is Responsible for the Phenotype of a Candida albicans sap4 Δ sap5 Δ sap6 Δ Mutant

Open access
Dunkel, Nico, Morschhäuser, Joachim·2011·Eukaryotic Cell

Abstract

The diploid genome of the pathogenic yeast Candida albicans exhibits a high degree of heterozygosity. Genomic alterations that result in a loss of heterozygosity at specific loci may affect phenotypes and confer a selective advantage under certain conditions. Such genomic rearrangements can also occur during the construction of C. albicans mutants and remain undetected. The SAP2 gene on chromosome R encodes a secreted aspartic protease that is induced and required for growth of C. albicans when proteins are the only available nitrogen source. In strain SC5314, the two SAP2 alleles are functionally divergent because of differences in their regulation. Basal expression of the SAP2-2 allele, but not the SAP2-1 allele, provides the proteolytic degradation products that serve as inducers for full SAP2 induction. A triple mutant lacking the SAP4, SAP5, and SAP6 genes, which are located on chromosome 6, has previously been reported to have a growth defect on proteins, suggesting that one of the encoded proteases is required for SAP2 expression. Here we show that this sap4Δ sap5Δ sap6Δ mutant has become homozygous for chromosome R and lost the SAP2-2 allele. Replacement of one of the SAP2-1 copies in this strain by SAP2-2 and its regulatory region restored the ability of the sap4Δ sap5Δ sap6Δ mutant to utilize proteins as the sole nitrogen source. This is an illustrative example of how loss of heterozygosity at a different genomic locus can cause the mutant phenotype attributed to targeted deletion of a specific gene in C. albicans.

Integrity signals

Registry

Crossref · 10.1128/ec.00281-10

Cites

53 of 53 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

We couldn’t retrieve this paper’s full text, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Alternative genomic changes involving copy-number variation (CNV), including short segmental CNV and loss of heterozygosity (LOH) in heterozygous species such as C. albicans, are proposed to drive fast adaptation.

    “On the other hand, alternative genomic changes involving copy-number variation (CNV), including short segmental CNV [64] and loss of heterozygosity (LOH) (in heterozygous species such as C. albicans), are also proposed to drive fast adaptation [81,132].”

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Dunkel, N., & Morschhäuser, J.
Affiliations
University of Würzburg (DE)
Corresponding author
Morschhäuser, Joachim
Venue
Eukaryotic Cell
Published
2011-01
Volume
10
Issue
1
Pages
54-62
ISSN
  • 1535-9778 (ISSN-L)
  • 1535-9786
OpenAlex
W2141878969
Cited by
20
References
53
Citations by year
2024: 1 · 2022: 2 · 2020: 2 · 2019: 3 · 2018: 1 · 2017: 2 · 2016: 3 · 2015: 1 · 2013: 3 · 2012: 2
FWCI
0.65
Type
journal article
Language
en
Open access
Locations
  • Eukaryotic Cell (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Deutsche Forschungsgemeinschaft (SFB 630)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Health Sciences › Medicine › Infectious Diseases › Antifungal resistance and susceptibility
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Yeasts and Rust Fungi Studies
Keywords
Candida albicans, loss of heterozygosity, secreted aspartic proteases, SAP2, SAP5, SAP6, genome rearrangement, gene replacement, protease induction, SC5314
MeSH terms
Candida albicans, Genes, Fungal, Nitrogen, Phenotype, Chromosomes, Fungal, Aspartic Acid Endopeptidases, Gene Deletion, Loss of Heterozygosity, Genetic Loci

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review