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Fork Reversal and ssDNA Accumulation at Stalled Replication Forks Owing to Checkpoint Defects
José M. Sogo,1*Massimo Lopes,2*Marco Foiani2
Checkpoint-mediated control of replicating chromosomes is essential
for preventing cancer. In yeast, Rad53 kinase protectsstalled
replication forks from pathological rearrangements. Tocharacterize the
mechanisms controlling fork integrity, we analyzedreplication
intermediates formed in response to replication blocksusing electron
microscopy. At the forks, wild-type cells accumulateshort
single-stranded regions, which likely causes checkpointactivation,
whereas rad53 mutants exhibit extensive single-strandedgaps
and hemi-replicated intermediates, consistent with a lagging-strandsynthesis defect. Further, rad53 cells accumulate Holliday
junctionsthrough fork reversal. We speculate that, in checkpoint
mutants,abnormal replication intermediates begin to form because of
uncoordinatedreplication and are further processed by unscheduled
recombinationpathways, causing genome instability.
1 Institute of Cell Biology, ETH
Hönggerberg, CH-8093 Zürich, Switzerland.
2 Istituto F.I.R.C. di Oncologia Molecolare, Via
Adamello 16, 20141, Milano, Italy, and Dipartimento di Genetica e di
Biologia dei Microrganismi, Università degli Studi di Milano, Via
Celoria 26, 20133, Milano, Italy.
*
These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail:
foiani{at}ifom-firc.it
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