Retinal input instructs alignment of visual topographic maps.

Retinal input instructs alignment of visual topographic maps.
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DOI:
10.1016/j.cell.2009.08.028
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发表时间:
2009-10-02
期刊:
影响因子:
64.5
通讯作者:
Feldheim DA
Feldheim DA
中科院分区:
生物学1区
文献类型:
--
作者:
Triplett JW;Owens MT;Yamada J;Lemke G;Cang J;Stryker MP;Feldheim DA

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感觉信息在大脑中以地形图的形式表示,其中相邻的神经元对相邻的外部刺激做出反应。在视觉系统中,上级丘接收来自视网膜和初级视觉皮层(V1)的地形投影。对齐可以通过使用共享轴突引导分子的梯度来实现,或者通过视网膜匹配机制来实现,其中监视视觉空间的相同区域的轴突对齐。为了区分这些可能性,我们利用基因工程小鼠,我们显示有一个重复的功能性视网膜丘地图,但只有一个单一的地图在V1。解剖跟踪显示,corticcollicular投影分叉对齐与复制retinocollicular地图的方式依赖于正常模式的自发活动在发展过程中。这些数据提出了一个通用模型,其中收敛地图使用重合的活动模式,以实现对齐。
Sensory information is represented in the brain in the form of topographic maps, in which neighboring neurons respond to adjacent external stimuli. In the visual system, the superior colliculus receives topographic projections from the retina and primary visual cortex (V1) that are aligned. Alignment may be achieved through the use of a gradient of shared axon guidance molecules, or through a retinal-matching mechanism in which axons that monitor identical regions of visual space align. To distinguish between these possibilities, we take advantage of genetically-engineered mice that we show have a duplicated functional retinocollicular map but only a single map in V1. Anatomical tracing revealed that the corticocollicular projection bifurcates to align with the duplicated retinocollicular map in a manner dependent on the normal pattern of spontaneous activity during development. These data suggest a general model in which convergent maps use coincident activity patterns to achieve alignment.
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