Kinetics of ultraviolet induced DNA excision repair in rat and human fibroblasts

J. Vijg, E. Mullaart, G. P. van der Schans, P. H.M. Lohman, D. L. Knook

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


To obtain more information on the well-documented low excision-repair capacity of rodent cells in comparison with human cells, we have studied this form of DNA repair in UV-irradiated human and rat skin fibroblasts. For this purpose, we have determined (i) unscheduled DNA synthesis (UDS), using autoradiography, (ii) the number and size of repaired sites with the bromodeoxyuridine (BrdU) photolysis assay and (iii) the removal of Micrococcus luteus UV-endonuclease susceptible sites (ESS). We found rat cells to be quite capable of performing DNA-repair synthesis, as demonstrated by both UDS and BrdU photolysis, whereas they almost completely lacked the capacity to remove pyrimidine dimers, as indicated by the persistence of ESS. This discrepancy will be discussed in terms of the types of mechanisms by which mammalian cells may recognize and remove UV-induced photoproducts.

Original languageEnglish (US)
Pages (from-to)129-138
Number of pages10
JournalMutation Research DNA Repair Reports
Issue number3-4
StatePublished - Jan 1 1984
Externally publishedYes

ASJC Scopus subject areas

  • Medicine(all)


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