Conference Publication Details
Mandatory Fields
Carty, MP,Glynn, M,Maher, M,Smith, T,Yao, J,Dixon, K,McCann, J,Rynn, L,Flanagan, A
Biochemical Society; Irish Area Section; Cellular stress responses and cancer Meeting
The RAD30 cancer susceptibility gene
2003
February
Published
1
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Optional Fields
DNA replication DNA polymerase eta mutation skin cancer xeroderma pigmentosum variant DNA-POLYMERASE-ETA PIGMENTOSUM VARIANT CELLS XERODERMA-PIGMENTOSUM ULTRAVIOLET-LIGHT THYMINE DIMER EXCISION-REPAIR MAMMALIAN-CELLS FREE-EXTRACTS HELA-CELLS REPLICATION
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The human skin cancer-prone disease xeroderma pigmentosum variant (XPV) results from a mutation in RAD30, which encodes the novel lesion bypass DNA polymerase eta. XPV cells are characterized by delayed completion of DNA replication and increased mutagenesis following UV irradiation. in cell-free extracts of XPV lymphoblasts, functional DNA polymerase eta is required for the complete replication of a double-stranded plasmid containing either a single (6-4) photoproduct or a cyclobutane pyrimidine dimer (CPD), the major mutagenic UV-induced lesion. In cultured XPV cells, replication arrest activates downstream signalling pathways, leading to hyperphosphorylation of the 34-kDa subunit of the trimeric single-stranded DNA-binding protein, RPA (replication protein A). Many of the RAD30 mutations identified in XPV cells result in truncation and inactivation of DNA polymerase eta. To examine whether polymorphisms in the RAD30 gene that result in altered polymerase eta function, rather than enzyme inactivation, might contribute to individual susceptibility to skin cancer, methods to screen for sequence changes in the RAD30 gene in human genomic DNA have been developed.
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