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. 1994 Nov 11;22(22):4620–4624. doi: 10.1093/nar/22.22.4620

Inhibition of gene-specific repair of alkylation damage in cells depleted of poly(ADP-ribose) polymerase.

T Stevnsner 1, R Ding 1, M Smulson 1, V A Bohr 1
PMCID: PMC308509  PMID: 7984410

Abstract

The role of the enzyme poly(adenosine diphosphate-ribose) polymerase (PADPRP) in DNA repair at the level of the gene was investigated with human HeLa cells in which PADPRP antisense transcripts are inducible with dexamethasone. After such induction, the cellular content of PADPRP is reduced by 90%. DNA damage and its repair was studied in the essential dihydrofolate reductase (DHFR) gene after exposure of the cells to either ultraviolet (UV) irradiation or the alkylating agent nitrogen mustard. The expression of the antisense construct had no effect on gene-specific repair of UV-induced pyrimidine dimers. In contrast, induced antisense cells were deficient in the gene-specific repair of nitrogen mustard-induced lesions. Dexamethasone itself did not inhibit gene-specific repair in control cells. Thus, PADPRP appears to participate in the gene-specific repair of alkylation damage, but not in the repair of UV-induced pyrimidine dimers. Clonal survival assays revealed that cells depleted of PADPRP showed an increased susceptibility to nitrogen mustard, supporting the notion that repair of essential genes is critical for cellular survival.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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