The E2F activators are implicated in a cell survival requirement

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dc.contributor.advisor Leone, Gustavo
dc.creator Ferrey, Antoney 2012-04-26T22:20:09Z 2012-04-26T22:20:09Z 2008-06
dc.description.abstract The pRB family, which includes p107 and p130 are known to control cell proliferation and differentiation (Mulligan and Jacks 1998). Their interactions with specific E2F transcription factors play a critical role in regulating the cell cycle progression. Wu et al, 2001 has shown that concomitant deletion of E2F1, E2F2, and E2F3 in Mouse Embryonic Fibroblasts (MEFs) renders them unable to proliferate. Since E2F1-3 have been implicated in driving expression of genes that promote the cell cycle, it was suggested that the inability of these cells to proliferate was due to a loss of gene expression. This in vitro analysis established that E2F3 must work alongside E2F1 and E2F2 to maintain normal proliferation. However, this conclusion had not been verified in differing cell types, and the in vivo importance of these conclusions was unknown. We show in this study that E2F1-3 are not required for cell proliferation or for differentiation of most cell types. Embryonic stem (ES) cells triply deficient for the E2F1-3 are able to proliferate, and teratomas formed from these cells are able to grow and differentiate. In vivo analysis using embryos triply deficient for E2F1-3 shows that they are able to survive until E9.5, suggesting that the activators are not essential during early embryogenesis. They are, however, critical for later stages of development. Similarly analysis of embryonic lenses deleted for E2F1-3 indicate their importance in particular tissues and highlights their potential role in cell cycle checkpoint regulation. The current study suggests a requirement for E2F1-3 in cell survival during development and begins to redefine the roles of E2Fs in vivo. en_US
dc.description.sponsorship Summer Research Opportunities Program en_US
dc.description.sponsorship Glenn Stokes Summer Research en_US
dc.language.iso en en_US
dc.publisher The Ohio State University en_US
dc.relation.ispartofseries The Ohio State University. College of Biological Sciences Honors Theses; 2008 en_US
dc.subject E2F Transcription Factors en_US
dc.subject Cancer Genetics en_US
dc.title The E2F activators are implicated in a cell survival requirement en_US
dc.type Thesis en_US
dc.description.embargo A three-year embargo was granted for this item. en_US