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Histone H1 in Saccharomyces cerevisiae
S C Ushinsky1, H Bussey, A A Ahmed
1Concordia University, Department of Biology, Montreal, Quebec, Canada.
Yeast (Chichester, England)
|February 1, 1997
Summary
Researchers confirmed the presence of histone H1 in yeast, naming the gene HHO1. While its deletion had no impact on growth, it altered gene expression, with histone H1 localized to the nucleus.
Area of Science:
- Molecular Biology
- Yeast Genetics
- Epigenetics
Background:
- The existence of histone H1 in Saccharomyces cerevisiae has been a long-standing question in molecular biology.
- Histone H1 proteins are known to play crucial roles in chromatin structure and gene regulation in eukaryotes.
Purpose of the Study:
- To investigate and confirm the presence of histone H1 in yeast.
- To characterize the gene encoding yeast histone H1 and its function.
Main Methods:
- Sequencing of the YPL127c gene, identified as encoding a protein similar to histone H1.
- Gene designation change to HHO1 (Histone H One).
- Analysis of HHO1 gene expression, including poly A+ RNA levels.
- Deletion mutant analysis to assess effects on cell growth, viability, and mating.
- Reporter gene assays (CYC1-lacZ) to evaluate gene expression changes.
- Fluorescence microscopy of histone H1-green fluorescent protein (GFP) fusion proteins for subcellular localization.
Main Results:
- A gene, HHO1, encoding a protein highly similar to histone H1 from other species was identified and sequenced.
- HHO1 is highly expressed in yeast as poly A+ RNA.
- Deletion of HHO1 had no observable effect on yeast cell growth, viability, or mating.
- HHO1 deletion significantly altered the expression of a CYC1-lacZ reporter gene.
- Histone H1 was found to be localized to the nucleus in yeast cells.
Conclusions:
- This study provides definitive evidence for the presence of histone H1 in Saccharomyces cerevisiae, designated HHO1.
- Despite lacking a major role in basic cellular processes like growth and viability, yeast histone H1 influences gene expression and is localized to the nucleus, suggesting a role in chromatin regulation.