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Published online 8 August 2005. doi:10.1083/jcb.200505075
The Rockefeller University Press, 0021-9525 $8.00
JCB, Volume 170, Number 4, 527-535
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Article

The origin recognition core complex regulates dendrite and spine development in postmitotic neurons



Zhen Huang1, Keling Zang2, and Louis F. Reichardt1,2

1 Department of Physiology, University of California San Francisco, San Francisco, CA 94143
2 Howard Hughes Medical Institute, University of California San Francisco, San Francisco, CA 94143

Correspondence to Louis F. Reichardt: lfr{at}cgl.ucsf.edu; or Zhen Huang: zhenh{at}itsa.ucsf.edu

The origin recognition complex (ORC) ensures exactly one round of genome replication per cell cycle through acting as a molecular switch that precisely controls the assembly, firing, and inactivation of the replication initiation machinery. Recent data indicate that it may also coordinate the processes of mitosis and cytokinesis and ensure the proper distribution of replicated genome to daughter cells. We have found that the ORC core subunits are highly expressed in the nervous system. They are selectively localized to the neuronal somatodendritic compartment and enriched in the membrane fraction. siRNA knockdown of ORC subunits dramatically reduced dendritic branch formation and severely impeded dendritic spine emergence. Expression of ORC ATPase motif mutants enhanced the branching of dendritic arbors. The ORC core complex thus appears to have a novel role in regulating dendrite and dendritic spine development in postmitotic neurons.

Abbreviations used in this paper: DIV, days in vitro; NMJ, neuromuscular junction; ORC, origin recognition complex.

This article contains online supplemental material.


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