Sensory transduction channel subunits, tax-4 and tax-2, modify presynaptic molecular architecture in C. elegans.

Sensory transduction channel subunits, tax-4 and tax-2, modify presynaptic molecular architecture in C. elegans.
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DOI:
10.1371/journal.pone.0024562
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发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Shen K
Shen K
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Hellman AB;Shen K

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在发育过程中,神经活动对于在神经网络中形成适当的连接非常重要。活动对神经元总体形态和突触强度的影响已得到充分记录,但人们对活动如何影响发育过程中不同分子成分知之甚少。在这里,我们检查了四种荧光标记的突触前蛋白(RAB-3、SNG-1/synaptogyrin、SYD-2/Liprin-α 和 SAD-1/SAD 激酶)在秀丽隐杆线虫热感觉神经元 AFD 中的定位。我们发现tax-4和tax-2这两个编码AFD感觉转导必需的环核苷酸门控通道的基因会破坏所有四种蛋白质的定位。在野生型动物中,突触小泡 (SV) 标记 RAB-3 和 SNG-1 以及活性区标记 SYD-2 和 SAD-1 在 AFD 轴突中以固定的点状模式定位。在tax-4和tax-2突变体中,SV和SYD-2斑点数量较多且强度较低。有趣的是,SAD-1 斑点的强度也较低,但数量没有增加。斑点数量的变化可以在 AFD 中以细胞自主方式进行挽救。这些结果表明感觉转导基因tax-4和tax-2对于突触前的正确组装是必需的。
During development, neural activity is important for forming proper connections in neural networks. The effect of activity on the gross morphology and synaptic strength of neurons has been well documented, but little is known about how activity affects different molecular components during development. Here, we examine the localization of four fluorescently-tagged presynaptic proteins, RAB-3, SNG-1/synaptogyrin, SYD-2/Liprin-α, and SAD-1/SAD kinase, in the C. elegans thermosensory neuron AFD. We show that tax-4 and tax-2, two genes that encode the cyclic nucleotide-gated channel necessary for sensory transduction in AFD, disrupt the localization of all four proteins. In wild-type animals, the synaptic vesicle (SV) markers RAB-3 and SNG-1 and the active zone markers SYD-2 and SAD-1 localize in a stereotyped, punctate pattern in the AFD axon. In tax-4 and tax-2 mutants, SV and SYD-2 puncta are more numerous and less intense. Interestingly, SAD-1 puncta are also less intense but do not increase in number. The change in puncta number can be rescued cell-autonomously in AFD. These results suggest that sensory transduction genes tax-4 and tax-2 are necessary for the proper assembly of presynapses.
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