Drosophila dscam proteins regulate postsynaptic specificity at multiple-contact synapses.

Drosophila dscam proteins regulate postsynaptic specificity at multiple-contact synapses.
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DOI:
10.1016/j.neuron.2010.08.030
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发表时间:
2010-09-09
期刊:
影响因子:
16.2
通讯作者:
Meinertzhagen, Ian A.
Meinertzhagen, Ian A.
中科院分区:
医学1区
文献类型:
--
作者:
Millard, S. Sean;Lu, Zhiyuan;Zipursky, S. Lawrence;Meinertzhagen, Ian A.

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在脊椎动物和无脊椎动物的视觉系统中,神经元形成多接触突触,其中单个突触前位点通过不同突触后细胞的离散组合释放神经递质。这些突触的组装背后的识别机制尚不清楚。在果蝇中,光感受器末端形成四分体突触,其中包含一对不变的突触后元件,其中一个来自层间神经元L1和L2,另外两个来自其他细胞。在这里,我们证明了编码亲同性排斥蛋白的果蝇Dscam1和Dscam2基因在所有四分体中冗余地确保L1和L2突触后元件的不变组合。我们证明这种严格配对在Dscam1中丢失了;Dscam2双突变体。因此,去除这两种排斥蛋白允许来自同一细胞的元素合并到同一突触后四分体中,从而改变光感受器传递的特异性。我们提出Dscams通过排除多接触突触中不合适的伙伴来调节突触特异性。
In both vertebrate and invertebrate visual systems, neurons form multiple-contact synapses at which a single presynaptic site releases neurotransmitter upon a discrete combination of different postsynaptic cells. Recognition mechanisms underlying the assembly of such synapses are not known. In Drosophila, photoreceptor terminals form tetrad synapses that incorporate an invariable pair of postsynaptic elements, one each from lamina interneuron L1 and L2, and two elements from other cells. Here, we demonstrate that Drosophila Dscam1 and Dscam2, genes encoding homophilic repulsive proteins, act redundantly to ensure the invariable combination of L1 and L2 postsynaptic elements at all tetrads. We demonstrate that this strict pairing is lost in Dscam1;Dscam2 double mutants. Thus, removing these two repulsive proteins allows elements from the same cell to incorporate into the same postsynaptic tetrad, altering the specificity of photoreceptor transmission. We propose that Dscams regulate synaptic specificity by excluding inappropriate partners at multiple-contact synapses.
DOI: 10.1016/s0165-0270(96)00021-0
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