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Role of Saccharomyces cerevisiae chromatin assembly factor-I in repair of ultraviolet radiation damage in vivo.

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  • 1. Life Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
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    • Game JC 1
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Genetics, 01 Feb 1999, 151(2):485-497
https://doi.org/10.1093/genetics/151.2.485 PMID: 9927445 PMCID: PMC1460507

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Abstract 

In vitro, the protein complex Chromatin Assembly Factor-I (CAF-I) from human or yeast cells deposits histones onto DNA templates after replication. In Saccharomyces cerevisiae, the CAC1, CAC2, and CAC3 genes encode the three CAF-I subunits. Deletion of any of the three CAC genes reduces telomeric gene silencing and confers an increase in sensitivity to killing by ultraviolet (UV) radiation. We used double and triple mutants involving cac1Delta and yeast repair gene mutations to show that deletion of the CAC1 gene increases the UV sensitivity of cells mutant in genes from each of the known DNA repair epistasis groups. For example, double mutants involving cac1Delta and excision repair gene deletions rad1Delta or rad14Delta showed increased UV sensitivity, as did double mutants involving cac1Delta and deletions of members of the RAD51 recombinational repair group. cac1Delta also increased the UV sensitivity of strains with defects in either the error-prone (rev3Delta) or error-free (pol30-46) branches of RAD6-mediated postreplicative DNA repair but did not substantially increase the sensitivity of strains carrying null mutations in the RAD6 or RAD18 genes. Deletion of CAC1 also increased the UV sensitivity and rate of UV-induced mutagenesis in rad5Delta mutants, as has been observed for mutants defective in error-free postreplicative repair. Together, these data suggest that CAF-I has a role in error-free postreplicative damage repair and may also have an auxiliary role in other repair mechanisms. Like the CAC genes, RAD6 is also required for gene silencing at telomeres. We find an increased loss of telomeric gene silencing in rad6Delta cac1Delta and rad18Delta cac1Delta double mutants, suggesting that CAF-I and multiple factors in the postreplicative repair pathway influence chromosome structure.

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Genetics. 1999 Feb; 151(2): 485–497.
PMCID: PMC1460507
PMID: 9927445

Role of Saccharomyces cerevisiae chromatin assembly factor-I in repair of ultraviolet radiation damage in vivo.

J C Game and P D Kaufman
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Abstract

In vitro, the protein complex Chromatin Assembly Factor-I (CAF-I) from human or yeast cells deposits histones onto DNA templates after replication. In Saccharomyces cerevisiae, the CAC1, CAC2, and CAC3 genes encode the three CAF-I subunits. Deletion of any of the three CAC genes reduces telomeric gene silencing and confers an increase in sensitivity to killing by ultraviolet (UV) radiation. We used double and triple mutants involving cac1Delta and yeast repair gene mutations to show that deletion of the CAC1 gene increases the UV sensitivity of cells mutant in genes from each of the known DNA repair epistasis groups. For example, double mutants involving cac1Delta and excision repair gene deletions rad1Delta or rad14Delta showed increased UV sensitivity, as did double mutants involving cac1Delta and deletions of members of the RAD51 recombinational repair group. cac1Delta also increased the UV sensitivity of strains with defects in either the error-prone (rev3Delta) or error-free (pol30-46) branches of RAD6-mediated postreplicative DNA repair but did not substantially increase the sensitivity of strains carrying null mutations in the RAD6 or RAD18 genes. Deletion of CAC1 also increased the UV sensitivity and rate of UV-induced mutagenesis in rad5Delta mutants, as has been observed for mutants defective in error-free postreplicative repair. Together, these data suggest that CAF-I has a role in error-free postreplicative damage repair and may also have an auxiliary role in other repair mechanisms. Like the CAC genes, RAD6 is also required for gene silencing at telomeres. We find an increased loss of telomeric gene silencing in rad6Delta cac1Delta and rad18Delta cac1Delta double mutants, suggesting that CAF-I and multiple factors in the postreplicative repair pathway influence chromosome structure.

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Selected References

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