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Title: The role of the Mre11-Rad50-Nbs1 complex in double-strand break repair - Facts and myths
Authors: Takeda, Shunichi
Hoa, Nguyen Ngoc
Sasanuma, Hiroyuki  kyouindb  KAKEN_id
Author's alias: 武田, 俊一
笹沼, 博之
Keywords: double-strand break repair
double-strand break resection
etoposide
homologous recombination
ionizing radiation
Mre11
non-homologous end joining
topoisomerase
Issue Date: 16-Aug-2016
Publisher: Oxford University Press
Journal title: Journal of Radiation Research
Volume: 57
Issue: S1
Start page: i25
End page: i32
Abstract: Homologous recombination (HR) initiates double-strand break (DSB) repair by digesting 5′-termini at DSBs, the biochemical reaction called DSB resection, during which DSBs are processed by nucleases to generate 3′ single-strand DNA. Rad51 recombinase polymerizes along resected DNA, and the resulting Rad51-DNA complex undergoes homology search. Although DSB resection by the Mre11 nuclease plays a critical role in HR in Saccharomyces cerevisiae, it remains elusive whether DSB resection by Mre11 significantly contributes to HR-dependent DSB repair in mammalian cells. Depletion of Mre11 decreases the efficiency of DSB resection only by 2- to 3-fold in mammalian cells. We show that although Mre11 is required for efficient HR-dependent repair of ionizing-radiation-induced DSBs, Mre11 is largely dispensable for DSB resection in both chicken DT40 and human TK6 B cell lines. Moreover, a 2- to 3-fold decrease in DSB resection has virtually no impact on the efficiency of HR. Thus, although a large number of researchers have reported the vital role of Mre11-mediated DSB resection in HR, the role may not explain the very severe defect in HR in Mre11-deficient cells, including their lethality. We here show experimental evidence for the additional roles of Mre11 in (i) elimination of chemical adducts from DSB ends for subsequent DSB repair, and (ii) maintaining HR intermediates for their proper resolution.
Rights: © 2016 The Author 2016. Published by Oxford University Press on behalf of The Japan Radiation Research Society and Japanese Society for Radiation Oncology.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( http://creativecommons.org/licenses/by-nc/4.0/ ), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
URI: http://hdl.handle.net/2433/219574
DOI(Published Version): 10.1093/jrr/rrw034
Appears in Collections:Journal Articles

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