Cited by 407Antifungal resistance and susceptibilityFungal and yeast genetics researchDrug Transport and Resistance Mechanisms

TAC1 , Transcriptional Activator of CDR Genes, Is a New Transcription Factor Involved in the Regulation of Candida albicans ABC Transporters CDR1 and CDR2

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Coste, Alix T., Karababa, Mahir, Ischer, Françoise, Bille, Jacques, Sanglard, Dominique·2004·Eukaryotic Cell

Abstract

The ABC transporter genes CDR1 and CDR2 can be upregulated in Candida albicans developing resistance to azoles or can be upregulated by exposing cells transiently to drugs such as fluphenazine. The cis -acting drug-responsive element (DRE) present in the promoters of both genes and necessary for their upregulation contains 5′-CGG-3′ triplets that are often recognized by transcriptional activators with Zn(2)-Cys(6) fingers. In order to isolate regulators of CDR1 and CDR2 , the C. albicans genome was searched for genes encoding proteins with Zn(2)-Cys(6) fingers. Interestingly, three of these genes were tandemly arranged near the mating locus. Their involvement in CDR1 and CDR2 upregulation was addressed because a previous study demonstrated a link between mating locus homozygosity and azole resistance. The deletion of only one of these genes (orf19.3188) was sufficient to result in a loss of transient CDR1 and CDR2 upregulation by fluphenazine and was therefore named TAC1 (transcriptional activator of CDR genes). Tac1p has a nuclear localization, and a fusion of Tac1p with glutathione S -transferase could bind the cis -acting regulatory DRE in both the CDR1 and the CDR2 promoters. TAC1 is also relevant for azole resistance, since a TAC1 allele ( TAC1-2 ) recovered from an azole-resistant strain could trigger constitutive upregulation of CDR1 and CDR2 in an azole-susceptible laboratory strain. Transcript profiling experiments performed with a TAC1 mutant and a revertant containing TAC1-2 revealed not only CDR1 and CDR2 as targets of TAC1 regulation but also other genes ( RTA3 , IFU5 , and HSP12 ) that interestingly contained a DRE-like element in their promoters. In conclusion, TAC1 appears to be the first C. albicans transcription factor involved in the control of genes mediating antifungal resistance.

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Crossref · 10.1128/ec.3.6.1639-1652.2004

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Authors
Coste, A. T., Karababa, M., Ischer, F., Bille, J., & Sanglard, D.
Affiliations
  • Centre Hospitalier Universitaire Vaudois (CH)
  • Institute of Microbiology, University Hospital Lausanne, Lausanne, Switzerland
Corresponding author
Sanglard, Dominique
Venue
Eukaryotic Cell
Published
2004-12
Volume
3
Issue
6
Pages
1639-1652
ISSN
  • 1535-9778 (ISSN-L)
  • 1535-9786
OpenAlex
W2107043911
Cited by
407
References
41
Citations by year
2026: 12 · 2025: 19 · 2024: 17 · 2023: 22 · 2022: 19 · 2021: 28 · 2020: 22 · 2019: 25 · 2018: 15 · 2017: 23 · 2016: 17 · 2015: 17 · 2014: 25 · 2013: 17 · 2012: 13
FWCI
7.83
Type
journal article
Language
en
Open access
Locations
  • Eukaryotic Cell (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • IRIS (submittedVersion)
  • SERVAL (Université de Lausanne) (submittedVersion)
Funders
Burroughs Wellcome Fund
Topics
  • Health Sciences › Medicine › Infectious Diseases › Antifungal resistance and susceptibility
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
Keywords
TAC1, Candida albicans, CDR1, CDR2, ABC transporters, transcription factors, azole resistance, fluphenazine, antifungal resistance, transcriptional regulation, HSP12
MeSH terms
Alleles, Azoles, beta-Galactosidase, Biological Transport, Candida albicans, Cell Nucleus, Cloning, Molecular, Fungal Proteins, Glutathione Transferase, Models, Genetic, Nucleic Acid Hybridization, Plasmids, Promoter Regions, Genetic, Recombinant Fusion Proteins, RNA, Messenger, Saccharomyces cerevisiae, Time Factors, Transcription Factors, Blotting, Southern, Immunoblotting, Blotting, Northern, Transcriptional Activation, Up-Regulation, Genome, Fungal, Gene Deletion, DNA Primers, ATP-Binding Cassette Transporters, Loss of Heterozygosity, Oligonucleotide Array Sequence Analysis, Membrane Transport Proteins, Green Fluorescent Proteins

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