Carcinogenesis Advance Access originally published online on August 10, 2005
Carcinogenesis 2006 27(2):311-318; doi:10.1093/carcin/bgi207
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Carcinogenesis vol.27 no.2 © Oxford University Press 2005; all rights reserved.
Evidence for complex multigenic inheritance of radiation AML susceptibility in mice revealed using a surrogate phenotypic assay
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skaRadiation Effects Department, Health Protection Agency, Radiation Protection Division, Chilton, Didcot, Oxfordshire, OX11 0RQ, UK, 1 School of Animal and Microbial Sciences, University of Reading, Whiteknights, PO Box 228, Reading, Berkshire, RG6 6AJ, UK, 2 NIRS, Inage-Ku, Chiba-shi 263, Japan and 3 Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, CO 80523, USA
* To whom correspondence should be addressed. Tel: +44 1235 822648; Fax: +44 1235 833891; Email: simon.bouffler{at}hpa-rp.org.uk
The mapping of genes which affect individual cancer risk is an important but complex challenge. A surrogate assay of susceptibility to radiation-induced acute myeloid leukaemia (AML) in the mouse based on chromosomal radiosensitivity has been developed and validated. This assay was applied to the mapping of radiation-induced AML risk modifier loci by association with microsatellite markers. A region on chromosome (chr) 18 with strong association is identified and confirmed by backcross analysis. Additional loci on chrs 8 and 13 show significant association. A key candidate gene Rbbp8 on chr18 is identified. Rbbp8 is shown to be upregulated in response to X-irradiation in the AML sensitive CBA strain but not AML resistant C57BL/6 strain. This study demonstrates the strength of utilizing surrogate endpoints of cancer susceptibility in the mapping of mouse loci and identifies additional loci that may affect radiation cancer risk.