Cited by 118Fungal and yeast genetics researchAntifungal resistance and susceptibilityGenome Rearrangement Algorithms

Genome plasticity in Candida albicans is driven by long repeat sequences

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Todd, Robert T, Wikoff, Tyler D, Forche, Anja, Selmecki, Anna·2019·eLife

Abstract

Genome rearrangements resulting in copy number variation (CNV) and loss of heterozygosity (LOH) are frequently observed during the somatic evolution of cancer and promote rapid adaptation of fungi to novel environments. In the human fungal pathogen Candida albicans, CNV and LOH confer increased virulence and antifungal drug resistance, yet the mechanisms driving these rearrangements are not completely understood. Here, we unveil an extensive array of long repeat sequences (65–6499 bp) that are associated with CNV, LOH, and chromosomal inversions. Many of these long repeat sequences are uncharacterized and encompass one or more coding sequences that are actively transcribed. Repeats associated with genome rearrangements are predominantly inverted and separated by up to ~1.6 Mb, an extraordinary distance for homology-based DNA repair/recombination in yeast. These repeat sequences are a significant source of genome plasticity across diverse strain backgrounds including clinical, environmental, and experimentally evolved isolates, and represent previously uncharacterized variation in the reference genome.

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  • Genome changes such as whole-chromosome aneuploidy and shorter amplifications can raise resistance.

    “Copy number variations, including whole-chromosome aneuploidy and shorter-range amplifications, are genome changes that can increase resistance32,43–49.”

    From Drug resistance and tolerance in fungi. (2020) · cites this paper as [49]

    The Introduction (page not provided) says that amplification of a chromosome arm confers fluconazole resistance, and the Results report increased resistance with another segmental amplification. The paper also associates aneuploidy broadly with resistant isolates, but the passages do not establish that whole-chromosome aneuploidy itself increases resistance. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • Mutations in Tac1 increase efflux activity.

    “For example, mutations in Tac1, a positive transcriptional regulator of efflux pump genes, increases efflux activity49.”

    From Drug resistance and tolerance in fungi. (2020) · cites this paper as [49]

    The Introduction identifies Tac1 as a transcriptional activator of drug efflux pumps. It attributes fluconazole resistance to amplification of TAC1 and ERG11, but does not say that mutations in Tac1 increase efflux activity. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • The copy number breakpoints of all segmental aneuploidies occurred at long repeat sequences.

    “The copy number breakpoints of all segmental aneuploidies occurred at long repeat sequences as described previously (Todd et al. 2019; Todd and Selmecki 2020).”
  • The segmental chromosome LOH events frequently occurred at long inverted repeat sequences similar to copy number breakpoints previously implicated in FLC adaptation.

    “The segmental chromosome LOH events frequently occurred at long inverted repeat sequences similar to the copy number breakpoints previously implicated in FLC adaptation (Todd et al. 2019).”

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Authors
Todd, R. T., Wikoff, T. D., Forche, A., & Selmecki, A.
Affiliations
  • Creighton University (US)
  • Bowdoin College (US)
Corresponding author
Selmecki, Anna
Venue
eLife
Published
2019-06-07
Volume
8
ISSN
2050-084X (ISSN-L)
OpenAlex
W2948541340
Cited by
118
References
126
Citations by year
2026: 11 · 2025: 11 · 2024: 27 · 2023: 16 · 2022: 23 · 2021: 12 · 2020: 10 · 2019: 8
FWCI
4.39
Type
journal article
Language
en
Open access
Locations
  • eLife (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Bowdoin - Digital Commons (Bowdoin College) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Nebraska LB692 New Initiatives Grants (LB692 NE Tobacco Settlement Biomedical Research Development New Initiative Grant)
  • Nebraska's Established Program to Stimulate Competitive Research (EPSCoR First Award)
  • Nebraska Department of Health and Human Services (LB506-2017-55)
  • Creighton University (CURAS Faculty Faculty Research Fund)
  • National Center for Research Resources (P20RR018788 sub award)
  • National Institutes of Health (R15 AI090633)
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 › Genetics › Genome Rearrangement Algorithms
Keywords
Candida albicans, genome plasticity, copy number variation, loss of heterozygosity, chromosomal inversions, genome rearrangement, homologous recombination, antifungal resistance, virulence, somatic evolution
MeSH terms
Adaptation, Biological, Candida albicans, Chromosome Inversion, Recombination, Genetic, Repetitive Sequences, Nucleic Acid, Gene Rearrangement, Genome, Fungal, Loss of Heterozygosity, DNA Copy Number Variations

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