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Research Papers
Department of Genetics, Howard Hughes Medical Institute, Duke University Medical Center, Durham, North Carolina 27710, USA.
Abstract
Numerous experiments have defined a critical role for the G1 cyclins and associated kinases in allowing a normal progression of cells from a quiescent state, through G1, and into S phase. We now demonstrate that G1 cyclin-dependent kinase activity is critical for the accumulation of E2F activity late in G1. Moreover, E2F-1 overexpression can overcome a G1 arrest caused by the inhibition of G1 cyclin-dependent kinase activity, consistent with E2F activation being an important consequence of the action of G1 cyclins. E2F-1 also overcomes a G1 block caused by gamma irradiation and leads to an apparent complete replication of the cellular genome and entry into mitosis. This E2F-1-mediated induction of S phase and mitosis is not accompanied by the rise in either cyclin D-associated kinase activity or cdk2 activity that is normally observed during the G1 phase of the cell cycle. We conclude that one key function for G1 cyclin-dependent kinase activity is the activation of E2F-1, that the accumulation of E2F activity may be sufficient to allow initiation and completion of S phase, but that additional events, including G1 cyclin kinase activity, are likely necessary for a normal proliferative event.
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J. DeGregori, G. Leone, A. Miron, L. Jakoi, and J. R. Nevins Distinct roles for E2F proteins in cell growth control and apoptosis PNAS, July 8, 1997; 94(14): 7245 - 7250. [Abstract] [Full Text] [PDF] |
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K. Yamato, T. Koseki, M. Ohguchi, M. Kizaki, Y. Ikeda, and T. Nishihara Activin A Induction of Cell-Cycle Arrest Involves Modulation of Cyclin D2 and p21CIP1/WAF1 in Plasmacytic Cells Mol. Endocrinol., July 1, 1997; 11(8): 1044 - 1052. [Abstract] [Full Text] |
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J Lukas, T Herzinger, K Hansen, M C Moroni, D Resnitzky, K Helin, S I Reed, and J Bartek Cyclin E-induced S phase without activation of the pRb/E2F pathway. Genes & Dev., June 1, 1997; 11(11): 1479 - 1492. [Abstract] [PDF] |
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S. Iwase, Y. Furukawa, J. Kikuchi, M. Nagai, Y. Terui, M. Nakamura, and H. Yamada Modulation of E2F Activity Is Linked to Interferon-induced Growth Suppression of Hematopoietic Cells J. Biol. Chem., May 9, 1997; 272(19): 12406 - 12414. [Abstract] [Full Text] [PDF] |
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