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A unifying model for activity-dependent and activity-independent mechanisms predicts complete structure of topographic maps in ephrin-A deficient mice

机译:活动依赖和活动独立机制的统一模型可预测麻黄素A缺陷小鼠的地形图的完整结构

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摘要

Axons of retinal ganglion cells establish orderly projections to the superior colliculus of the midbrain. Axons of neighboring cells terminate proximally in the superior colliculus thus forming a topographically precise representation of the visual world. Coordinate axes are encoded in retina and in the target through graded expression of chemical labels. Additional sharpening of projections is provided by electric activity, which is correlated between neighboring axons. Here we propose a quantitative model, which allows combining the effects of chemical labels and correlated activity in a single approach. Using this model we study a complete structure of two-dimensional topographic maps in mutant mice, in which the label encoding the horizontal retinal coordinate ephrin-A is reduced/eliminated. We show that topographic maps in ephrin-A deficient mice display a granular structure, with the regions of smooth mapping separated by linear discontinuities reminiscent of fractures observed in the maps of preferred orientation.
机译:视网膜神经节细胞的轴突建立到中脑上丘的有序投影。邻近细胞的轴突在上丘的近端终止,从而形成视觉世界的地形精确表示。通过化学标记的分级表达,坐标轴在视网膜和目标中编码。电活动提供了投影的额外锐化,电活动与相邻轴突之间相关。在这里,我们提出了一个定量模型,该模型允许在单个方法中结合化学标记的作用和相关的活性。使用该模型,我们研究了突变小鼠的二维地形图的完整结构,其中编码/水平视网膜坐标ephrin-A的标签被减少/消除。我们表明,在ephrin-A缺陷小鼠中的地形图显示出颗粒状结构,平滑映射的区域被线性不连续性所分隔,让人联想到在首选方向的地图中观察到的骨折。

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