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Molecular and Cellular Biology, November 1998, p. 6457-6473, Vol. 18, No. 11
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
The Human ARF Cell Cycle Regulatory Gene Promoter Is a CpG Island
Which Can Be Silenced by DNA Methylation and Down-Regulated by
Wild-Type p53
Keith D.
Robertson and
Peter A.
Jones*
Norris Comprehensive Cancer Center,
The University of Southern California, Los Angeles, California
90033
Received 21 April 1998/Returned for modification 24 May
1998/Accepted 6 August 1998
The INK4a/ARF locus encodes two proteins involved in tumor
suppression in a manner virtually unique in mammalian cells.
Distinct first exons, driven from separate promoters, splice onto a
common exon 2 and 3 but utilize different reading frames to produce two completely distinct proteins, both of which play roles in cell cycle
control. INK4a, a critical element of the retinoblastoma gene pathway,
binds to and inhibits the activities of CDK4 and CDK6, while ARF, a
critical element of the p53 pathway, increases the level of functional
p53 via interaction with MDM2. Here we clone and characterize the
promoter of the human ARF gene and show that it is a CpG island
characteristic of a housekeeping gene which contains numerous Sp1
sites. Both ARF and INK4a are coordinately expressed in cells
except when their promoter regions become de novo methylated. In one of
these situations, ARF transcription could be reactivated by
treatment with the DNA methylation inhibitor 5-aza-2'-deoxycytidine, and the reactivation kinetics of ARF and INK4a
were found to differ slightly in a cell line in which both genes were
silenced by methylation. The ARF promoter was also found to be highly
responsive to E2F1 expression, in keeping with previous results at the
RNA level. Lastly, transcription from the ARF promoter was
down-regulated by wild-type p53 expression, and the magnitude of the
effect correlated with the status of the endogenous p53 gene. This
finding points to the existence of an autoregulatory feedback loop
between p53, MDM2, and ARF, aimed at keeping p53 levels in
check.
*
Corresponding author. Mailing address: The University
of Southern California, Norris Comprehensive Cancer Center, 1441 Eastlake Ave., MS 83, Los Angeles, CA 90033. Phone: (323) 865-0816. Fax: (323) 865-0102. E-mail:
jones_p{at}froggy.hsc.usc.edu.
Molecular and Cellular Biology, November 1998, p. 6457-6473, Vol. 18, No. 11
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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