Nucleic Acids Research, Vol 24, Issue 9 1669-1675, Copyright © 1996 by Oxford University Press
W Siede, G Nusspaumer, V Portillo, R Rodriguez and EC Friedberg
Mutants of the yeast Saccharomyces cerevisiae defective in the RAD17 gene
are sensitive to ultraviolet (UV) and gamma radiation and manifest a defect
in G2 arrest following radiation treatment. We have cloned the RAD17 gene
by complementation of the UV sensitivity of a rad17-1 mutant and identified
an ORF of 1.2 kb encoding a predicted gene product of 45.4 kDa with
homology to the Schizosaccharomyces pombe rad1+ gene product and to
Ustilago maydis Rec1, a known 3'->5'exonuclease. The RAD17 transcript is
cell cycle regulated, with maximum steady-state levels during late G1. The
rad17-1 mutation represents a missense mutation that maps to a conserved
region of the gene. A rad17 disruption mutant grows normally and manifests
levels of UV sensitivity similar that of the rad17-1 strain. As previously
observed with other genes involved in G2 arrest (such as RAD9 and RAD24),
RAD17 regulates radiation-induced G1 checkpoints at at least two possible
arrest stages. One is equivalent to or upstream of START, the other at or
downstream of the Cdc4 execution point. However, the temperature
sensitivity of the cell cycle mutant dna1-1 (a G1 arrest mutant) is not
influenced by inactivation of RAD17.
ARTICLES
Cloning and characterization of RAD17, a gene controlling cell cycle responses to DNA damage in Saccharomyces cerevisiae
Laboratory of Molecular Pathology, Department of Pathology, University of Texas Southwestern Medical Center, Dallas, 75235, USA.
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