Nucleic Acids Research, Vol 27, Issue 17 3410-3416, Copyright © 1999 by Oxford University Press
M Lombaerts, PH Peltola, R Visse, H den Dulk, JA Brandsma and J Brouwer
The global genome repair (GGR) subpathway of nucleotide excision repair
(NER) is capable of removing lesions throughout the genome. In
Saccharomyces cerevisiae the RAD7 and RAD16 genes are essential for GGR.
Here we identify rhp7 (+), the RAD7 homolog in Schizosaccharomyces pombe.
Surprisingly, rhp7 (+)and the previously cloned rhp16 (+)are located very
close together and are transcribed in opposite directions. Upon UV
irradiation both genes are induced, reaching a maximum level after 45-60
min. These observations suggest that the genes are co- regulated.
Schizo-saccharomyces pombe rhp7 or rhp16 deficient cells are, in contrast
to S.cerevisiae rad7 and rad16 mutants, not sensitive to UV irradiation. In
S.pombe an alternative repair mechanism, UV damage repair (UVDR), is
capable of efficiently removing photolesions from DNA. In the absence of
this UVDR pathway both rhp7 and rhp16 deficient cells display an enhanced
UV sensitivity. Epistatic analyses show that rhp7 (+)and rhp16 (+)are only
involved in NER. Repair analyses at nucleotide resolution demonstrate that
both Rhp7 and Rhp16, probably acting in a complex, are essential for GGR in
S.pombe.
ARTICLES
Characterization of the rhp7(+) and rhp16(+) genes in Schizosaccharomyces pombe
Medical Genetics Centre South-West Netherlands, Department of Molecular Genetics, Leiden Institute of Chemistry, Leiden University, 2300 RA Leiden, The Netherlands.
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