Abstract
Loss of the genome maintenance factor Elg1 causes serious genome instability that
leads to cancer, but the underlying mechanism is unknown. Elg1 forms the major
subunit of a Replication factor C-like complex, Elg1-RLC, which unloads the ringshaped
polymerase clamp PCNA from DNA during replication. Here we show that
prolonged retention of PCNA on DNA into G2/M phase is the major cause of genome
instability in elg1Δ yeast. Overexpression-induced accumulation of PCNA on DNA
causes genome instability. Conversely, disassembly-prone PCNA mutants that relieve
PCNA accumulation rescue the genome instability of elg1Δ cells. Covalent
modifications to the retained PCNA make only a minor contribution to elg1Δ genome
instability. By engineering cell-cycle-regulated ELG1 alleles, we show that abnormal
accumulation of PCNA on DNA during S phase causes moderate genome instability
and its retention through G2/M phase exacerbates genome instability. Our results
reveal that PCNA unloading by Elg1-RLC is critical for genome maintenance.
Original language | English |
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Pages (from-to) | 684-695 |
Number of pages | 12 |
Journal | Cell Reports |
Volume | 16 |
Issue number | 3 |
Early online date | 30 Jun 2016 |
DOIs | |
Publication status | Published - 19 Jul 2016 |
Bibliographical note
AcknowledgmentsWe thank Richard Kolodner, Grant Brown, and Daniel Durocher for strains and plasmids. We thank Anne Donaldson, Alexander Lorenz, and Shin-ichiro Hiraga from University of Aberdeen for careful reading of the manuscript. Research in T.K.’s lab is supported by Medical Research Council Career Development Fellowship L019698/1. V.K.G. was supported by Biotechnology and Biological Sciences Research Council grant K006304/1. T.S.T. was supported by grants from the Ministry of Education, Culture, Sports, Science and Technology of Japan (nos. 23131507 and 25131712).
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Takashi Kubota
- School of Medicine, Medical Sciences & Nutrition, Microbiology and Immunity
- School of Medicine, Medical Sciences & Nutrition, Medical Sciences - Lecturer
- School of Medicine, Medical Sciences & Nutrition, Institute of Medical Sciences
Person: Academic, Academic Related - Research