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Mol. Cell. Biol., Nov 1995, 6128-6138, Vol 15, No. 11
B Garvik, M Carson and L Hartwell
A cdc13 temperature-sensitive mutant of Saccharomyces cerevisiae arrests in
the G2 phase of the cell cycle at the restrictive temperature as a result
of DNA damage that activates the RAD9 checkpoint. The DNA lesions present
after a failure of Cdc13p function appear to be located almost exclusively
in telomere-proximal regions, on the basis of the profile of induced
mitotic recombination. cdc13 rad9 cells dividing at the restrictive
temperature contain single- stranded DNA corresponding to telomeric and
telomere-proximal DNA sequences and eventually lose telomere-associated
sequences. These results suggest that the CDC13 product functions in
telomere metabolism, either in the replication of telomeric DNA or in
protecting telomeres from the double-strand break repair system. Moreover,
since cdc13 rad9 cells divide at a wild-type rate for several divisions at
the restrictive temperature while cdc13 RAD9 cells arrest in G2, these
results also suggest that single-stranded DNA may be a specific signal for
the RAD9 checkpoint.
Copyright © 1995, American Society for Microbiology
Single-stranded DNA arising at telomeres in cdc13 mutants may constitute a specific signal for the RAD9 checkpoint [published erratum appears in Mol Cell Biol 1996 Jan;16(1):457]
Department of Genetics, University of Washington, Seattle 98195, USA.
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