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Yeast HAT1 and HAT2 deletions have different life-span and transcriptome phenotypes
Lorena E Rosaleny1, Oreto Antúnez, Ana B Ruiz-García
1Departament de Bioquímica i Biologia Molecular, Universitat de València, Dr. Moliner 50, E46100 Burjassot, Spain.
FEBS Letters
|July 19, 2005
Summary
The yeast histone acetyltransferase HAT-B, comprising Hat1, Hat2, and Hif1 proteins, influences lifespan. Specifically, mutations in Hat2 (hat2 or hat1hat2 double mutants) extend yeast lifespan, suggesting additional roles for Hat2 beyond Hat1.
Area of Science:
- Molecular Biology
- Genetics
- Aging Research
Background:
- The HAT-B complex in yeast is a histone acetyltransferase crucial for cellular processes.
- Understanding the specific roles of its components, Hat1 and Hat2, is essential for elucidating its functions.
Purpose of the Study:
- To investigate the individual and combined roles of Hat1 and Hat2 proteins within the HAT-B complex.
- To determine the impact of hat1 and hat2 mutations on yeast lifespan and gene expression.
Main Methods:
- Generation of yeast mutants: hat1, hat2, and hat1hat2 double mutants.
- Lifespan analysis of wild-type and mutant yeast strains.
- Transcriptome analysis using RNA sequencing to compare gene expression profiles.
Main Results:
- hat2 and hat1hat2 double mutants exhibited significantly extended lifespans compared to wild-type yeast.
- Single hat mutants showed minimal transcriptional differences from wild-type.
- The hat1hat2 double mutant displayed a transcriptional profile similar to, but more pronounced than, the hat1 mutant.
Conclusions:
- Hat2 protein possesses functions independent of Hat1 within the HAT-B complex.
- Hat2 plays a significant role in regulating yeast lifespan and gene expression patterns.
- The interplay between Hat1 and Hat2 is critical for cellular homeostasis and aging.