Nucleic Acids Research, 1995, Vol. 23, No. 10 1679-1685
© 1995
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Regulation of the Saccharomyces cerevisiae DNA repair gene RAD16
Laboratory of Molecular Genetics, Department of Biochemistry, Leiden Institute for Chemistry, Goriaeus Laboratories Leiden University, PO Box 9502, 2300 RA Leiden, The Netherlands
* To whom correspondence should be addressed
Received February 23, 1995. Revised April 5, 1995. Accepted April 5, 1995.
The RAD16 gene product has been shown to be essential for the repair of the silenced mating type loci [Bang et al. (1992) Nucleic Acids Res. 20, 39253931]. More recently we demonstrated that the RAD16 and RAD7 proteins are also required for repair of non-transcribed strands of active genes in Saccharomyces cerevisiae [Waters et al. (1993) Mol. Gen. Genet. 239, 2832]. We have studied the regulation of the RAD16 gene and found that the RAD16 transcript levels increased up to 7-fold upon UV irradiation. Heat shock at 42°C also results in elevated levels of RAD16mRNA. In sporulatlng MAT
MATa diplold cells RAD16mRNA is also induced. The basal level of the RAD16 transcr1pt is constant during the mltotic cell cycle. G1-arrested cells show normal Induction of RAD16mRNA upon UV irradiation demonstrating that the Induction is not a secondary consequence of G2 cell cycle arrest following UV irradiation. However, in cells arrested in G1 the induction of RAD16 mRNA after UV irradiation is not followed by a rapid decline as occurs In normal growing cells suggesting that the down regulation of RAD16 transcription is dependent on progression into the cell cycle.
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