Cited by 56Fungal and yeast genetics researchPlant Stress Responses and ToleranceBacterial Genetics and Biotechnology

Differential gene expression and Hog1 interaction with osmoresponsive genes in the extremely halotolerant black yeast Hortaea werneckii

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Vaupotič, Tomaž, Plemenitaš, Ana·2007·BMC Genomics

Abstract

BACKGROUND: Fluctuations in external salinity force eukaryotic cells to respond by changes in the gene expression of proteins acting in protective biochemical processes, thus counteracting the changing osmotic pressure. The high-osmolarity glycerol (HOG) signaling pathway is essential for the efficient up-regulation of the osmoresponsive genes. In this study, the differential gene expression of the extremely halotolerant black yeast Hortaea werneckii was explored. Furthermore, the interaction of mitogen-activated protein kinase HwHog1 and RNA polymerase II with the chromatin in cells adapted to an extremely hypersaline environment was analyzed. RESULTS: A cDNA subtraction library was constructed for H. werneckii, adapted to moderate salinity or an extremely hypersaline environment of 4.5 M NaCl. An uncommon osmoresponsive set of 95 differentially expressed genes was identified. The majority of these had not previously been connected with the adaptation of salt-sensitive S. cerevisiae to hypersaline conditions. The transcriptional response in hypersaline-adapted and hypersaline-stressed cells showed that only a subset of the identified genes responded to acute salt-stress, whereas all were differentially expressed in adapted cells. Interaction with HwHog1 was shown for 36 of the 95 differentially expressed genes. The majority of the identified osmoresponsive and HwHog1-dependent genes in H. werneckii have not been previously reported as Hog1-dependent genes in the salt-sensitive S. cerevisiae. The study further demonstrated the co-occupancy of HwHog1 and RNA polymerase II on the chromatin of 17 up-regulated and 2 down-regulated genes in 4.5 M NaCl-adapted H. werneckii cells. CONCLUSION: Extremely halotolerant H. werneckii represents a suitable and highly relevant organism to study cellular responses to environmental salinity. In comparison with the salt-sensitive S. cerevisiae, this yeast shows a different set of genes being expressed at high salt concentrations and interacting with HwHog1 MAP kinase, suggesting atypical processes deserving of further study.

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  • 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
Vaupotič, T., & Plemenitaš, A.
Affiliations
University of Ljubljana (SI)
Corresponding author
Plemenitaš, Ana
Venue
BMC Genomics
Published
2007
Volume
8
Issue
1
Pages
280
ISSN
1471-2164 (ISSN-L)
OpenAlex
W2123047375
Cited by
56
References
35
Citations by year
2026: 1 · 2025: 5 · 2024: 3 · 2023: 1 · 2022: 4 · 2021: 4 · 2019: 1 · 2018: 2 · 2017: 6 · 2016: 1 · 2015: 2 · 2014: 4 · 2013: 6
FWCI
1.06
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • BMC Genomics (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Javna Agencija za Raziskovalno Dejavnost RS (P1-0170)
  • University of California, San Francisco
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Fungal and yeast genetics research
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Stress Responses and Tolerance
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
Keywords
Hortaea werneckii, black yeast, halotolerance, Hog1 MAP kinase, differential gene expression, RNA polymerase II, salt stress response, Saccharomyces cerevisiae comparison
MeSH terms
Osmotic Pressure, Sodium Chloride, Yeasts, Signal Transduction, Up-Regulation, Gene Expression Regulation, Fungal, Mitogen-Activated Protein Kinases, Saccharomyces cerevisiae Proteins, Salinity

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