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Effects of chromosomal integration site upon p53 interactions with DNA consensus sequence homologies

Oncogene volume 18, pages 2373–2379 (1999)Cite this article

Abstract

In the present study, we report that, despite the presence of one perfect p53 consensus sequence homology (designated SCL CS) and four half-sites within the 3′-untranslated region of the stem cell leukemia (SCL) gene, the native endogenous gene is not regulated by p53. We employ a tet-repressible system to show that, under conditions in which the WAF1 mRNA steady-state level is upregulated fourfold by p53, the SCL mRNA level is not altered. In a previous report, we demonstrated that p53 interactions with the SCL CS can upregulate downstream reporter gene activity 43-fold in transient reporter assays. This disparity prompted us to explore the differences between p53 regulation of SCL CS activity in organized (chromosomally integrated) and disorganized (non-replicating episomal plasmid) chromatin. We show that p53 can increase (between 3 – 80-fold), decrease (between 5 – 33-fold) or have no effect upon transactivation of an SCL CS/reporter fusion gene depending upon chromosomal integration site. Most studies used to characterize p53 binding sites employ transient transfection assays. Our results suggest that characterization of consensus sequence homologies by assay of transiently transfected cells may be inaccurate.

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Acknowledgements

This work was supported by the Alton Ochsner Medical Foundation.

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  1. Division of Research, Alton Ochsner Medical Foundation, 1516 Jefferson Hwy, New Orleans, 70121, Louisiana, USA

    J L Cook, Z Zhang, J Alam & R N Re

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Cook, J., Zhang, Z., Alam, J. et al. Effects of chromosomal integration site upon p53 interactions with DNA consensus sequence homologies. Oncogene 18, 2373–2379 (1999). https://doi.org/10.1038/sj.onc.1202566

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