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A New E6/P63 Pathway, Together with a Strong E7/E2F Mitotic Pathway, Modulates the Transcriptome in Cervical Cancer Cells

Sébastien Teissier,^1, Youcef Ben Khalifa,^1, Marcella Mori,^2,3 Patricia Pautier,⁴ Christian Desaintes,² and Françoise Thierry^1*

Unité Expression Génétique et Maladies, CNRS FRE 2850, Institut Pasteur, 25 rue du Dr. Roux, 75724 Paris cedex 15, France,¹ Laboratory of Radiobiology and Microbiology, Belgian Nuclear Research Centre (SCK-CEN), Boeretang 200, Mol, Belgium,² Pharmacology Department, NEIM, Medical School, VUB, Brussels, Belgium,³ IGR, Villejuif, France⁴

Received 27 February 2007/ Accepted 11 June 2007

Cervical carcinoma is associated with certain types of human papillomaviruses expressing the E6 and E7 oncogenes, which are involved in carcinogenesis through their interactions with the p53 and pRB pathways, respectively. A critical event on the path to malignant transformation is often manifested by the loss of expression of the viral E2 transcription factor due to the integration into the host genome of the viral DNA. Using microarrays, we have previously shown that reintroduction of a functional E2 in the HeLa cervical carcinoma cell line activates a cluster of p53 target genes while at the same time severely repressing a group of E2F target genes. In the present study, using new high-density microarrays containing more than 22,000 human cDNA sequences, we identified a novel p63 pathway among E2-activated genes and 38 new mitotic genes repressed by E2. We then sought to determine the pathways through which these genes were modulated and used an approach that relies on small interfering RNA to demonstrate that the p63 target genes were activated through silencing of the E6/E6AP pathway while the mitotic genes were mainly repressed through E7 silencing. Importantly, a subset of the mitotic genes was shown to be significantly induced in biopsies of stage IV cervical cancers, which points to a prominent E7 pathway in cervical carcinoma.

Published ahead of print on 20 June 2007.

S.T. and Y.B.K. contributed equally to this work.