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Molecular and Cellular Biology, April 2001, p. 2956-2966, Vol. 21, No. 8
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.8.2956-2966.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Cyclin A Is a Mediator of p120E4F-Dependent Cell Cycle Arrest in G1

Lluis Fajas,1,dagger Conception Paul,1 Annick Vié,1 Soline Estrach,1 René Medema,2 Jean Marie Blanchard,1 Claude Sardet,1 and Marie-Luce Vignais1,*

Institut de Génétique Moléculaire de Montpellier, CNRS UMR 5535, IFR 24, 34293 Montpellier Cedex 5, France,1 and Jordan Laboratory, Department of Haematology, University Hospital, 3584 CX Utrecht, The Netherlands2

Received 31 July 2000/Returned for modification 22 September 2000/Accepted 3 January 2001

E4F is a ubiquitously expressed GLI-Krüppel-related transcription factor which has been identified for its capacity to regulate transcription of the adenovirus E4 gene in response to E1A. However, cellular genes regulated by E4F are still unknown. Some of these genes are likely to be involved in cell cycle progression since ectopic p120E4F expression induces cell cycle arrest in G1. Although p21WAF1 stabilization was proposed to mediate E4F-dependent cell cycle arrest, we found that p120E4F can induce a G1 block in p21-/- cells, suggesting that other proteins are essential for the p120E4F-dependent block in G1. We show here that cyclin A promoter activity can be repressed by p120E4F and that this repression correlates with p120E4F binding to the cyclic AMP-responsive element site of the cyclin A promoter. In addition, enforced expression of cyclin A releases p120E4F-arrested cells from the G1 block. These data identify the cyclin A gene as a cellular target for p120E4F and suggest a mechanism for p120E4F-dependent cell cycle regulation.

* Corresponding author. Mailing address: Institut de Génétique Moléculaire de Montpellier, CNRS UMR 5535, IFR 24, 1919 Route de Mende, 34293 Montpellier Cedex 5, France. Phone: (33) 4 67 61 36 50. Fax: (33) 4 67 04 02 31. E-mail: vignais{at}jones.igm.cnrs-mop.fr.

dagger Present address: IGBMC, Parc d'innovation, 67404 Illkirch, France.

Molecular and Cellular Biology, April 2001, p. 2956-2966, Vol. 21, No. 8
0270-7306/01/$04.00+0   DOI: 10.1128/MCB.21.8.2956-2966.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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