Schizosaccharomyces pombe checkpoint response to DNA interstrand cross-links.

Abstract:

:Drugs that produce covalent interstrand cross-links (ICLs) in DNA remain central to the treatment of cancer, but the cell cycle checkpoints activated by ICLs have received little attention. We have used the fission yeast, Schizosaccharomyces pombe, to elucidate the checkpoint responses to the ICL-inducing anticancer drugs nitrogen mustard and mitomycin C. First we confirmed that the repair pathways acting on ICLs in this yeast are similar to those in the main organisms studied to date (Escherichia coli, budding yeast, and mammalian cells), principally nucleotide excision repair and homologous recombination. We also identified and disrupted the S. pombe homologue of the Saccharomyces cerevisiae SNM1/PSO2 ICL repair gene and found that this activity is required for normal resistance to cross-linking agents, but not other forms of DNA damage. Survival and biochemical analysis indicated a key role for the "checkpoint Rad" family acting through the chk1-dependent DNA damage checkpoint in the ICL response. Rhp9-dependent phosphorylation of Chk1 correlates with G(2) arrest following ICL induction. In cells able to bypass the G(2) block, a second-cycle (S-phase) arrest was observed. Only a transient activation of the Cds1 DNA replication checkpoint factor occurs following ICL formation in wild-type cells, but this is increased and persists in G(2) arrest-deficient mutants. This likely reflects the fraction of cells escaping the G(2) damage checkpoint and arresting in the subsequent S phase due to ICL replication blocks. Disruption of cds1 confers increased resistance to ICLs, suggesting that this second-cycle S-phase arrest might be a lethal event.

journal_name

Mol Cell Biol

authors

Lambert S,Mason SJ,Barber LJ,Hartley JA,Pearce JA,Carr AM,McHugh PJ

doi

10.1128/mcb.23.13.4728-4737.2003

subject

Has Abstract

pub_date

2003-07-01 00:00:00

pages

4728-37

issue

13

eissn

0270-7306

issn

1098-5549

journal_volume

23

pub_type

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