CDC5 and CKII control adaptation to the yeast DNA damage checkpoint

David P. Toczyski, David J. Galgoczy, Leland H. Hartwell

Research output: Contribution to journalArticlepeer-review

378 Scopus citations


A single double-stranded DNA (dsDNA) break will cause yeast cells to arrest in G2/M at the DNA damage checkpoint. If the dsDNA break cannot be repaired, cells will eventually override (that is, adapt to) this checkpoint, even though the damage that elicited the arrest is still present. Here, we report the identification of two adaptation-defective mutants that remain permanently arrested as large-budded cells when faced with an irreparable dsDNA break in a nonessential chromosome. This adaptation-defective phenotype was entirely relieved by deletion of RADg, a gene required for the G2/M DNA damage checkpoint arrest. We show that one mutation resides in CDCS, which encodes a polo-like kinase, whereas a second, less penetrant, adaptation- defective mutant is affected at the CKB2 locus, which encodes a nonessential specificity subunit of casein kinase II.

Original languageEnglish (US)
Pages (from-to)1097-1106
Number of pages10
Issue number6
StatePublished - Sep 19 1997
Externally publishedYes

ASJC Scopus subject areas

  • General Biochemistry, Genetics and Molecular Biology


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