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

The origin recognition core complex regulates dendrite and spine development in postmitotic neurons.
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DOI:
10.1083/jcb.200505075
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发表时间:
2005-08-15
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Reichardt LF
Reichardt LF
中科院分区:
其他
文献类型:
--
作者:
Huang Z;Zang K;Reichardt LF

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起源识别复合体(ORC)通过充当分子开关来精确控制复制起始机制的组装、激发和失活,从而确保每个细胞周期只有一轮基因组复制。最近的数据表明,它还可能协调有丝分裂和胞质分裂的过程,并确保复制的基因组正确地分配给子细胞。我们发现ORC核心亚单位在神经系统中高度表达。它们选择性地定位于神经元的躯体树突间,并富含在膜组分中。ORC亚基的siRNA敲除显著减少了树突状分支的形成,并严重阻碍了树突棘的出现。ORC ATPase基序突变体的表达促进了树枝的分枝。因此,ORC核心复合体似乎在调节有丝分裂后神经元中的树突和树突棘的发育方面具有新的作用。
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.
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