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| Subject Categories: Cell Cycle | Development |
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| The EMBO Journal
(2002) 21, 3337–3346, doi: 10.1093/emboj/cdf338 |
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| Telencephalon-specific Rb knockouts reveal enhanced neurogenesis, survival and abnormal cortical development |
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| Kerry L. Ferguson1, Jacqueline L. Vanderluit1, Jean M. Hébert2, W.C. McIntosh1, Emma Tibbo1, Jason G. MacLaurin1, David S. Park1, Valerie A. Wallace1, Marc Vooijs3, Susan K. McConnell2 and Ruth S. Slack1 |
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1 Ottawa Health Research Institute, University of Ottawa, 451 Smyth Road, Ottawa, ON, Canada K1H 8M5 2 Department of Biological Sciences, Stanford University, Stanford, CA 94305-5020, USA 3 The Netherlands Cancer Institute, Division of Molecular Genetics, Plesmanlaan 121, 1066 CX Amsterdam, The Netherlands To whom correspondence should be addressed Ruth S. Slack, rslack@uottawa.ca Received 13 March 2002; Revised 8 May 2002; Accepted 8 May 2002. |
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| Abstract |
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| Correct cell cycle regulation and terminal mitosis are critical for nervous system development. The retinoblastoma (Rb) protein is a key regulator of these processes, as Rb-/- embryos die by E15.5, exhibiting gross hematopoietic and neurological defects. The extensive apoptosis in Rb-/- embryos has been attributed to aberrant S phase entry resulting in conflicting growth control signals in differentiating cells. To assess the role of Rb in cortical development in the absence of other embryonic defects, we examined mice with telencephalon-specific Rb deletions. Animals carrying a floxed Rb allele were interbred with mice in which cre was knocked into the Foxg1 locus. Unlike germline knockouts, mice specifically deleted for Rb in the developing telencephalon survived until birth. In these mutants, Rb-/- progenitor cells divided ectopically, but were able to survive and differentiate. Mutant brains exhibited enhanced cellularity due to increased proliferation of neuroblasts. These studies demonstrate that: (i) cell cycle deregulation during differentiation does not necessitate apoptosis; (ii) Rb-deficient mutants exhibit enhanced neuroblast proliferation; and (iii) terminal mitosis may not be required to initiate differentiation. |
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| Keywords: apoptosis, cell cycle, central nervous system, differentiation, retinoblastoma |
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