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J. Biol. Chem., Vol. 277, Issue 40, 36921-36930, October 4, 2002
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§,
§¶,
,
, and
¶
From the The c-myc proto-oncogene can direct a
diverse array of biological activities, including cell cycle
progression, apoptosis, and differentiation. It is believed that Myc
can affect this wide variety of activities by functioning as a
regulator of gene transcription, although few targets have been
identified to date. To delineate the molecular program regulated
downstream of Myc, we used a cDNA microarray approach and
identified 52 putative targets out of >6000 cDNAs analyzed. To
further distinguish the subset of genes whose regulation was dependent
upon Myc per se from those regulated in response to
activation of general mitogenic or apoptotic programs, the putative
cDNA targets were then screened by a series of assays. By this
approach 37 putative targets were ruled out and 15 Myc target genes
were uncovered. Interestingly, comparing our results with other high
throughput screens reveals that certain putative Myc targets
previously reported are shown not to be regulated downstream of Myc
(e.g. ribosomal proteins, HSP90
Ontario Cancer Institute and
¶ Department of Medical Biophysics, University of Toronto,
Toronto, Ontario M5G 2M9, Canada
), whereas others are
further supported by our analyses (e.g. pdgf
r,
nucleolin). The identity of genes specifically regulated downstream of
Myc provides the critical tools required to understand the role Myc holds in the transformation process and to delineate how Myc functions as a regulator of gene transcription.
To whom correspondence should be addressed: Division of
Cellular and Molecular Biology, Ontario Cancer Institute/Princess Margaret Hospital, 610 University Ave., Toronto, Ontario M5G 2M9, Canada. Tel.: 416-946-2276; Fax: 416-946-2840; E-mail:
lpenn@uhnres.utoronto.ca.
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