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Journal of Virology, May 1999, p. 4481-4484, Vol. 73, No. 5
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

The Proto-Oncogene c-myc Is a Direct Target Gene of Epstein-Barr Virus Nuclear Antigen 2

Carmen Kaiser, Gerhard Laux, Dirk Eick, Nicola Jochner, Georg W. Bornkamm, and Bettina Kempkes*

Institut für Klinische Molekularbiologie und Tumorgenetik, GSF Forschungszentrum für Umwelt und Gesundheit, D-81377 Munich, Germany

Received 1 December 1998/Accepted 1 February 1999

Epstein-Barr virus (EBV) infects and transforms primary B lymphocytes in vitro. Viral infection initiates the cell cycle entry of the resting B lymphocytes. The maintenance of proliferation in the infected cells is strictly dependent on functional EBNA2. We have recently developed a conditional immortalization system for EBV by rendering the function of EBNA2, and thus proliferation of the immortalized cells, dependent on estrogen. This cellular system was used to identify early events preceding induction of proliferation. We show that LMP1 and c-myc are directly activated by EBNA2, indicating that all cellular factors essential for induction of these genes by EBNA2 are present in the resting cells. In contrast, induction of the cell cycle regulators cyclin D2 and cdk4 are secondary events, which require de novo protein synthesis.

* Corresponding author. Mailing address: Institut für Klinische Molekularbiologie und Tumorgenetik, GSF Forschungszentrum für Umwelt und Gesundheit, Marchioninistr. 25, D-81377 Munich, Germany. Phone: 49-89-7099-354. Fax: 49-89-7099-500. E-mail: kempkes{at}gsf.de.

Journal of Virology, May 1999, p. 4481-4484, Vol. 73, No. 5
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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Copyright © 1999 by the American Society for Microbiology. All rights reserved.