The Rad50 hook domain regulates DNA damage signaling and tumorigenesis
- Ramon Roset1,
- Akiko Inagaki1,
- Marcel Hohl1,
- Fabienne Brenet2,
- Julien Lafrance-Vanasse3,
- Julian Lange1,
- Joseph M. Scandura2,
- John A. Tainer3,
- Scott Keeney1,4,5 and
- John H.J. Petrini1,5,6
- 1Molecular Biology Program, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA;
- 2Department of Medicine, Laboratory of Molecular Hematopoiesis, Weill-Cornell Medical College, New York, New York 10065, USA;
- 3Life Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA;
- 4Howard Hughes Medical Institute, Memorial Sloan-Kettering Cancer Center, New York, New York 10065, USA;
- 5Weill Graduate School of Medical Sciences, Cornell University, New York, New York 10021, USA
Abstract
The Mre11 complex (Mre11, Rad50, and Nbs1) is a central component of the DNA damage response (DDR), governing both double-strand break repair and DDR signaling. Rad50 contains a highly conserved Zn2+-dependent homodimerization interface, the Rad50 hook domain. Mutations that inactivate the hook domain produce a null phenotype. In this study, we analyzed mutants with reduced hook domain function in an effort to stratify hook-dependent Mre11 complex functions. One of these alleles, Rad5046, conferred reduced Zn2+ affinity and dimerization efficiency. Homozygous Rad5046/46 mutations were lethal in mice. However, in the presence of wild-type Rad50, Rad5046 exerted a dominant gain-of-function phenotype associated with chronic DDR signaling. At the organismal level, Rad50+/46 exhibited hydrocephalus, liver tumorigenesis, and defects in primitive hematopoietic and gametogenic cells. These outcomes were dependent on ATM, as all phenotypes were mitigated in Rad50+/46 Atm+/− mice. These data reveal that the murine Rad50 hook domain strongly influences Mre11 complex-dependent DDR signaling, tissue homeostasis, and tumorigenesis.
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Footnotes
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↵6 Corresponding author
E-mail petrinij{at}mskcc.org
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Supplemental material is available for this article.
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Article published online ahead of print. Article and publication date are online at http://www.genesdev.org/cgi/doi/10.1101/gad.236745.113.
- Received December 18, 2013.
- Accepted January 16, 2014.
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