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. 1993 Feb;13(2):1002–1012. doi: 10.1128/mcb.13.2.1002

Defective replication of psoralen adducts detected at the gene-specific level in xeroderma pigmentosum variant cells.

R R Misra 1, J M Vos 1
PMCID: PMC358985  PMID: 8423773

Abstract

Replication of damaged DNA is suspected to play an important role in cell cycle, genetic stability, and survival pathways. Using psoralen photoaddition as prototype DNA damage and the renaturing agarose gel electrophoresis technique to measure DNA cross-linking in individual genes, Vos and Hanawalt previously observed efficient bypass replication of psoralen monoadducts in human genes (J.-M. H. Vos and P. C. Hanawalt, Cell 50:789-799, 1987). To understand the mechanism of bypass replication in human cells, mutants affected in such a process would be useful. We now report that cells from individuals suffering from the hereditary recessive syndrome xeroderma pigmentosum variant (XPV) are hypersensitive to killing induced by photoactivated psoralen. In addition, analysis of psoralen-mediated DNA cross-linking in the rRNA genes indicated that although repair of psoralen adducts was similar to that of normal individuals, XPV cells were markedly deficient in the ability to bypass psoralen adducts during replication; in comparison with normal cells, approximately half as many monoadducts were bypassed during replication in XPV cells. Furthermore, in contrast to normal cells, replication of interstrand cross-links was not detected in XPV. This is the first demonstration of a deficiency in bypass replication detected at the gene-specific level in vivo. A model involving a strand-specific defect in recombinational bypass in XPV is proposed.

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Selected References

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