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The Aspergillus nidulans uvsB gene encodes an ATM-related kinase required for multiple facets of the DNA damage
1Department of Microbiology, University of Connecticut Health Center, Farmington, Connecticut 06030-3205, USA.
Abstract:
In Aspergillus nidulans, uvsB and uvsD belong to the same epistasis group of DNA repair mutants. Recent observations suggest that these genes are likely to control cell cycle checkpoint responses to DNA damage and incomplete replication. Consistent with this notion, we show here that UVSB is a member of the conserved family of ATM-related kinases. Phenotypic characterization of uvsB mutants shows that they possess defects in additional aspects of the DNA damage response besides checkpoint control, including inhibition of septum formation, regulation of gene expression, and induced mutagenesis. The musN227 mutation partially suppresses the poor growth and DNA damage sensitivity of uvsB mutants. Although musN227 partially suppresses several uvsB defects, it does not restore checkpoint function to uvsB mutants. Notably, the failure of uvsB mutants to restrain septum formation in the presence of DNA damage is suppressed by the musN227 mutation. We propose that UVSB functions as the central regulator of the A. nidulans DNA damage response, whereas MUSN promotes recovery by modulating a subset of the response.
Insights
The UVSB protein regulates DNA damage response in Aspergillus nidulans, controlling cell cycle checkpoints and other vital cellular processes. A separate mutation, musN227, partially rescues some uvsB defects without restoring full checkpoint function.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- UVSB and UVS D are DNA repair mutants in Aspergillus nidulans.
- These genes are implicated in cell cycle checkpoint control following DNA damage or replication stress.
Purpose of the Study:
- To investigate the role of UVSB in DNA damage response pathways.
- To characterize the interaction between UVSB and the musN227 mutation.
Main Methods:
- Biochemical characterization of UVSB as an ATM-related kinase.
- Phenotypic analysis of uvsB mutants under DNA damaging conditions.
- Genetic analysis of the musN227 suppressor mutation.
Main Results:
- UVSB is identified as a conserved ATM-related kinase.
- uvsB mutants exhibit defects in checkpoint control, gene expression, mutagenesis, and septum formation.
- The musN227 mutation partially suppresses growth defects and DNA damage sensitivity of uvsB mutants.
- musN227 does not restore checkpoint function but suppresses the failure of septum formation inhibition in uvsB mutants.
Conclusions:
- UVSB acts as a central regulator of the DNA damage response in A. nidulans.
- MUSN plays a role in promoting recovery by modulating specific DNA damage response pathways.