Making a visual map: mechanisms and molecules.

Making a visual map: mechanisms and molecules.
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DOI:
10.1016/j.conb.2009.04.011
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发表时间:
2009-04
影响因子:
5.7
通讯作者:
Feldheim, David A.
Feldheim, David A.
中科院分区:
医学2区
文献类型:
--
作者:
Clandinin, Thomas R.;Feldheim, David A.

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视觉系统的发展利用全局和局部线索来组装视觉世界的地形图,将突触连接排列成列和层。最近的遗传学研究为这些过程的机制提供了新的见解。在苍蝇中,神经分化的精确时间序列提供了一个全球性的组织线索;在脊椎动物中,肝配蛋白介导的信号的梯度,与神经营养因子共受体和神经活动,起着至关重要的作用。在果蝇和小鼠中,神经过程通过同型、排斥相互作用、自分泌信号和细胞内在机制形成精确的阵列。通过时间调节的细胞-细胞粘附以及特异性粘附分子的组合表达来实现层靶向特异性。未来的研究将确定这些全球和本地线索之间的相互作用。
Visual system development utilizes global and local cues to assemble a topographic map of the visual world, arranging synaptic connections into columns and layers. Recent genetic studies have provided new insights into the mechanisms that underlie these processes. In flies, a precise temporal sequence of neural differentiation provides a global organizing cue; in vertebrates, gradients of ephrin-mediated signals, acting with neurotrophin co-receptors and neural activity, play crucial roles. In flies and mice, neural processes tile into precise arrays through homotypic, repulsive interactions, autocrine signals, and cell-intrinsic mechanisms. Laminar targeting specificity is achieved through temporally regulated cell–cell adhesion, as well as combinatorial expression of specific adhesion molecules. Future studies will define the interactions between these global and local cues.
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