Cited by 78Endoplasmic Reticulum Stress and DiseaseFungal and yeast genetics researchIon Channels and Receptors

Dissection of Ire1 Functions Reveals Stress Response Mechanisms Uniquely Evolved in Candida glabrata

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Miyazaki, Taiga, Nakayama, Hironobu, Nagayoshi, Yohsuke, Kakeya, Hiroshi, Kohno, Shigeru·2013·PLoS Pathogens

Abstract

Proper protein folding in the endoplasmic reticulum (ER) is vital in all eukaryotes. When misfolded proteins accumulate in the ER lumen, the transmembrane kinase/endoribonuclease Ire1 initiates splicing of HAC1 mRNA to generate the bZIP transcription factor Hac1, which subsequently activates its target genes to increase the protein-folding capacity of the ER. This cellular machinery, called the unfolded protein response (UPR), is believed to be an evolutionarily conserved mechanism in eukaryotes. In this study, we comprehensively characterized mutant phenotypes of IRE1 and other related genes in the human fungal pathogen Candida glabrata. Unexpectedly, Ire1 was required for the ER stress response independently of Hac1 in this fungus. C. glabrata Ire1 did not cleave mRNAs encoding Hac1 and other bZIP transcription factors identified in the C. glabrata genome. Microarray analysis revealed that the transcriptional response to ER stress is not mediated by Ire1, but instead is dependent largely on calcineurin signaling and partially on the Slt2 MAPK pathway. The loss of Ire1 alone did not confer increased antifungal susceptibility in C. glabrata contrary to UPR-defective mutants in other fungi. Taken together, our results suggest that the canonical Ire1-Hac1 UPR is not conserved in C. glabrata. It is known in metazoans that active Ire1 nonspecifically cleaves and degrades a subset of ER-localized mRNAs to reduce the ER load. Intriguingly, this cellular response could occur in an Ire1 nuclease-dependent fashion in C. glabrata. We also uncovered the attenuated virulence of the C. glabrata Δire1 mutant in a mouse model of disseminated candidiasis. This study has unveiled the unique evolution of ER stress response mechanisms in C. glabrata.

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  • Lack of CgIre1 led to diminished virulence in both immunosuppressed and immunocompetent mice.

    “Furthermore, lack of CgIre1 led to diminished virulence in both immunosuppressed and immunocompetent mice [97].”

    From Candida glabrata: A Lot More Than Meets the Eye (2019) · cites this paper as [97]

  • For survival of ER stress, the essentiality of the key ER stress sensor CgIre1 endoribonuclease was attributed to its role in activation of the non-canonical unfolded protein response pathway.

    “For survival of the ER stress, essentiality of the key ER stress sensor, CgIre1 endoribonuclease, was attributed to its role in activation of the non-canonical unfolded protein response pathway [97].”

    From Candida glabrata: A Lot More Than Meets the Eye (2019) · cites this paper as [97]

  • Duplications and large scale genomic variations, although they can lead to significant issues such as genomic instability, play a major role in yeast evolution.

    “As such, ALE studies highlight that duplications and large scale genomic variations, although they can lead to significant issues such as genomic instability [152], play a major role in e.g. yeast evolution; this is also indicated by data on wine yeasts, galactose utilization, comparative genomics and drug resistance [115,153-156].”

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Authors
Miyazaki, T., Nakayama, H., Nagayoshi, Y., Kakeya, H., & Kohno, S.
Affiliations
  • Nagasaki University (JP)
  • Suzuka University of Medical Science (JP)
Corresponding author
Miyazaki, Taiga
Venue
PLoS Pathogens
Published
2013-01-31
Volume
9
Issue
1
Pages
e1003160
ISSN
  • 1553-7366 (ISSN-L)
  • 1553-7374
OpenAlex
W2054729583
Cited by
78
References
90
Citations by year
2026: 5 · 2025: 4 · 2024: 3 · 2023: 3 · 2022: 3 · 2021: 6 · 2020: 10 · 2019: 5 · 2018: 9 · 2017: 3 · 2016: 5 · 2015: 6 · 2014: 8 · 2013: 8
FWCI
5.22
Type
journal article
Language
en
Open access
Locations
  • PLoS Pathogens (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
  • Institutional Repositories DataBase (IRDB) (submittedVersion, cc-by-nc-nd)
  • Nagasaki University's Academic Output SITE (Nagasaki University) (submittedVersion, cc-by-nc-nd)
Funders
  • Ministry of Education, Culture, Sports, Science and Technology (21390305, 24791027)
  • Japan Society for the Promotion of Science (24791027, 21390305)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Endoplasmic Reticulum Stress and Disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Life Sciences › Neuroscience › Sensory Systems › Ion Channels and Receptors
Keywords
IRE1, HAC1, unfolded protein response, ER stress response, Candida glabrata, calcineurin signaling, endoplasmic reticulum protein folding, antifungal susceptibility, virulence, systemic candidiasis
MeSH terms
Amino Acid Sequence, Animals, Candidiasis, Disease Models, Animal, Endoribonucleases, Humans, Immunocompetence, Molecular Sequence Data, RNA, Messenger, Rodent Diseases, Species Specificity, Gene Expression Regulation, Enzymologic, Survival Rate, Calcineurin, Sequence Analysis, Protein, MAP Kinase Signaling System, Candida glabrata, Microarray Analysis, Basic-Leucine Zipper Transcription Factors, Mice, Unfolded Protein Response, Endoplasmic Reticulum Stress

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