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EMBO reports
May, 2004;5 (5): 497-502.

The absence of the yeast chromatin assembly factor Asf1 increases genomic instability and sister chromatid exchange.

Félix Prado, Felipe Cortés-Ledesma, Andrés Aguilera
Author Information
  1. Félix Prado: Departamento de Genética, Facultad de Biología, Universidad de Sevilla, Avda. Reina Mercedes 6, 41012 Sevilla, Spain.
PMID: 15071494 DOI: 10.1038/sj.embor.7400128

Abstract

Histone chaperone Asf1 participates in heterochromatin silencing, DNA repair and regulation of gene expression, and promotes the assembly of DNA into chromatin in vitro. To determine the influence of Asf1 on genetic stability, we have analysed the effect of asf1Delta on homologous recombination. In accordance with a defect in nucleosome assembly, asf1Delta leads to a loss of negative supercoiling in plasmids. Importantly, asf1Delta increases spontaneous recombination between inverted DNA sequences. This increase correlates with an accumulation of double-strand breaks (DSBs) as determined by immunodetection of phosphorylated histone H2A and fluorescent detection of Rad52-YFP foci during S and G2/M phases. In addition, asf1Delta shows high levels of sister chromatid exchange (SCE) and is proficient in DSB-induced SCE as determined by physical analysis. Our results suggest that defective chromatin assembly caused by asf1Delta leads to DSBs that can be repaired by SCE, affecting genetic stability.

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MeSH Term

Cell Cycle Proteins
Chromatin
DNA Damage
DNA Repair
DNA-Binding Proteins
Genomic Instability
Molecular Chaperones
Nucleic Acid Conformation
Nucleosomes
Plasmids
Rad52 DNA Repair and Recombination Protein
Recombinant Fusion Proteins
Saccharomyces cerevisiae
Saccharomyces cerevisiae Proteins
Sister Chromatid Exchange

Chemicals

ASF1 protein, S cerevisiae
Cell Cycle Proteins
Chromatin
DNA-Binding Proteins
Molecular Chaperones
Nucleosomes
RAD52 protein, S cerevisiae
Rad52 DNA Repair and Recombination Protein
Recombinant Fusion Proteins
Saccharomyces cerevisiae Proteins
Journal Article Research Support, Non-U.S. Gov't

Word Cloud

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