Golgi outposts shape dendrite morphology by functioning as sites of acentrosomal microtubule nucleation in neurons.

Golgi outposts shape dendrite morphology by functioning as sites of acentrosomal microtubule nucleation in neurons.
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DOI:
10.1016/j.neuron.2012.10.008
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发表时间:
2012-12-06
期刊:
影响因子:
16.2
通讯作者:
Jan YN
Jan YN
中科院分区:
医学1区
文献类型:
--
作者:
Ori-McKenney KM;Jan LY;Jan YN

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Microtubule nucleation is essential for proper establishment and maintenance of axons and dendrites. Centrosomes, the primary site of nucleation in most cells, lose their function as microtubule organizing centers during neuronal development. How neurons generate acentrosomal microtubules remains unclear. Drosophila dendritic arborization (da) neurons lack centrosomes and therefore provide a model system to study acentrosomal microtubule nucleation. Here we investigate the origin of microtubules within the elaborate dendritic arbor of class IV da neurons. Using a combination of in vivo and in vitro techniques, we find that Golgi outposts can directly nucleate microtubules throughout the arbor. This acentrosomal nucleation requires gamma-tubulin and CP309, the Drosophila homologue of AKAP450, and contributes to the complex microtubule organization within the arbor, and dendrite branch growth and stability. Together, these results identify the first direct mechanism for acentrosomal microtubule nucleation within neurons, and reveal a previously unknown function for Golgi outposts in this process.
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