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Molecular and Cellular Biology, February 2001, p. 703-712, Vol. 21, No. 3
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.3.703-712.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Targeted Deletion of the S-Phase-Specific Myc Antagonist Mad3
Sensitizes Neuronal and Lymphoid Cells to Radiation-Induced
Apoptosis
Christophe
Quéva,
Grant A.
McArthur,
Brian M.
Iritani, and
Robert N.
Eisenman*
Division of Basic Sciences, Fred Hutchinson
Cancer Research Center, Seattle, Washington 98109-1024
Received 6 July 2000/Returned for modification 21 August
2000/Accepted 31 October 2000
The Mad family comprises four basic-helix-loop-helix/leucine zipper
proteins, Mad1, Mxi1, Mad3, and Mad4, which heterodimerize with Max and
function as transcriptional repressors. The balance between Myc-Max and
Mad-Max complexes has been postulated to influence cell proliferation
and differentiation. The expression patterns of Mad family genes are
complex, but in general, the induction of most family members is linked
to cell cycle exit and differentiation. The expression pattern of
mad3 is unusual in that mad3 mRNA and protein
were found to be restricted to proliferating cells prior to
differentiation. We show here that during murine development mad3 is specifically expressed in the S phase of the cell
cycle in neuronal progenitor cells that are committed to
differentiation. To investigate mad3 function, we disrupted
the mad3 gene by homologous recombination in mice. No
defect in cell cycle exit and differentiation could be detected in
mad3 homozygous mutant mice. However, upon gamma
irradiation, increased cell death of thymocytes and neural progenitor
cells was observed, implicating mad3 in the regulation of
the cellular response to DNA damage.
*
Corresponding author. Mailing address: Division of
Basic Sciences, Fred Hutchinson Cancer Research Center, 1100 Fairview
Ave. North
Mailstop A2-025, P.O. Box 19024, Seattle, WA
98109-1024. Phone: (206) 667-4445. Fax: (206) 667-6522. E-mail:
eisenman{at}fred.fhcrc.org.

Present address: AstraZeneca Transgenic Center, S-431 83 Mölndal,
Sweden.

Present address: Peter MacCallum Cancer Institute, Division of
Haematology and Medical Oncology, Victoria 8006,
Australia.
Molecular and Cellular Biology, February 2001, p. 703-712, Vol. 21, No. 3
0270-7306/01/$04.00+0 DOI: 10.1128/MCB.21.3.703-712.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
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