Document Detail


NEUROG2 drives cell cycle exit of neuronal precursors by specifically repressing a subset of cyclins acting at the G1 and S phases of the cell cycle.
MedLine Citation:
PMID:  22547683     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Proneural NEUROG2 (neurogenin 2 [Ngn2]) is essential for neuronal commitment, cell cycle withdrawal, and neuronal differentiation. Although NEUROG2's influence on neuronal commitment and differentiation is beginning to be clarified, its role in cell cycle withdrawal remains unknown. We therefore set out to investigate the molecular mechanisms by which NEUROG2 induces cell cycle arrest during spinal neurogenesis. We developed a large-scale chicken embryo strategy, designed to find gene networks modified at the onset of NEUROG2 expression, and thereby we identified those involved in controlling the cell cycle. NEUROG2 activation leads to a rapid decrease of a subset of cell cycle regulators acting at G(1) and S phases, including CCND1, CCNE1/2, and CCNA2 but not CCND2. The use of NEUROG2VP16 and NEUROG2EnR, acting as the constitutive activator and repressor, respectively, indicates that NEUROG2 indirectly represses CCND1 and CCNE2 but opens the possibility that CCNE2 is also repressed by a direct mechanism. We demonstrated by phenotypic analysis that this rapid repression of cyclins prevents S phase entry of neuronal precursors, thus favoring cell cycle exit. We also showed that cell cycle exit can be uncoupled from neuronal differentiation and that during normal development NEUROG2 is in charge of tightly coordinating these two processes.
Authors:
Marine Lacomme; Laurence Liaubet; Fabienne Pituello; Sophie Bel-Vialar
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-04-30
Journal Detail:
Title:  Molecular and cellular biology     Volume:  32     ISSN:  1098-5549     ISO Abbreviation:  Mol. Cell. Biol.     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-06-11     Completed Date:  2012-09-06     Revised Date:  2013-06-25    
Medline Journal Info:
Nlm Unique ID:  8109087     Medline TA:  Mol Cell Biol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2596-607     Citation Subset:  IM    
Affiliation:
Centre de Biologie du Développement, CNRS UMR5547, Toulouse, France.
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MeSH Terms
Descriptor/Qualifier:
Animals
Avian Proteins / antagonists & inhibitors,  genetics,  metabolism*
Base Sequence
Cell Cycle Checkpoints / genetics,  physiology*
Cell Proliferation
Chick Embryo
Cyclin A2 / genetics,  metabolism
Cyclin D1 / genetics,  metabolism
Cyclin E / genetics,  metabolism
Cyclins / genetics,  metabolism*
Embryonic Stem Cells / cytology,  metabolism
G1 Phase
Gene Expression Regulation, Developmental
Gene Regulatory Networks
Nerve Tissue Proteins / antagonists & inhibitors,  genetics,  metabolism*
Neural Stem Cells / cytology*,  metabolism*
Neurogenesis / genetics,  physiology
RNA, Small Interfering / genetics
S Phase
Chemical
Reg. No./Substance:
0/Avian Proteins; 0/Cyclin A2; 0/Cyclin E; 0/Cyclins; 0/Nerve Tissue Proteins; 0/RNA, Small Interfering; 136601-57-5/Cyclin D1
Comments/Corrections

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