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Functional Assembly of Accessory Optic System Circuitry Critical for Compensatory Eye Movements

机译:辅助光学系统电路的功能组件对于补偿眼球运动至关重要

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Accurate motion detection requires neural circuitry that compensates for global visual field motion. Select subtypes of retinal ganglion cells perceive image motion and connect to the accessory optic system (AOS) in the brain, which generates compensatory eye movements that stabilize images during slow visual field motion. Here, we show that the murine transmembrane semaphorin 6A (Sema6A) is expressed in a subset of On direction-selective ganglion cells (On DSGCs) and is required for retino-recipient axonal targeting to the medial terminal nucleus (MTN) of the AOS. Plexin A2 and A4, two Sema6A binding partners, are expressed in MTN cells, attract Sema6A(+) On DSGC axons, and mediate MTN targeting of Sema6A(+) RGC projections. Furthermore, Sema6A/Plexin-A2/A4 signaling is required for the functional output of the AOS. These data reveal molecular mechanisms underlying the assembly of AOS circuits critical for moving image perception.
机译:准确的运动检测需要神经电路来补偿全局视野的运动。选定的视网膜神经节细胞亚型可以感知图像运动并连接到大脑中的辅助视神经系统(AOS),后者会产生补偿性眼球运动,从而在缓慢的视野运动过程中稳定图像。在这里,我们显示鼠跨膜信号量6A(Sema6A)在On方向选择性神经节细胞(On DSGCs)中表达,并且是视网膜受体轴突靶向AOS的内侧末端核(MTN)所必需的。 Plexin A2和A4,两个Sema6A结合伴侣,在MTN细胞中表达,在DSGC轴突上吸引Sema6A(+),并介导Sema6A(+)RGC投影的MTN靶向。此外,AOS的功能输出需要Sema6A / Plexin-A2 / A4信号。这些数据揭示了对运动图像感知至关重要的AOS电路组装的分子机制。

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