Genetic access to neurons in the accessory optic system reveals a role for Sema6A in midbrain circuitry mediating motion perception.

Genetic access to neurons in the accessory optic system reveals a role for Sema6A in midbrain circuitry mediating motion perception.
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DOI:
10.1002/cne.24507
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发表时间:
2019-01-01
期刊:
The Journal of comparative neurology
影响因子:
--
通讯作者:
Kolodkin AL
Kolodkin AL
中科院分区:
其他
文献类型:
--
作者:
Lilley BN;Sabbah S;Hunyara JL;Gribble KD;Al-Khindi T;Xiong J;Wu Z;Berson DM;Kolodkin AL

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辅助光学系统(AOS)检测视网膜图像滑移并将其报告给眼科系统以进行反射图像稳定。在这里,我们描述了两个Cre线,允许遗传访问AOS电路响应垂直运动。第一个(Pcdh 9-Cre)标签上的方向选择性视网膜神经节细胞(ON-DS RGCs),那些更喜欢腹侧视网膜运动的四个亚型之一。它们的轴突从视束分叉,并选择性地支配AOS的内侧终核(MTN)。与大多数研究的RGC亚型不同,它们在视神经挤压后存活。第二条Cre驱动线(Pdzk 1 ip 1-Cre)标记MTN中的突触后神经元。这些主要投射到AOS的另一个主要终核,即视束核(NOT)。我们发现,跨膜蛋白semaphorin 6A(Sema 6A)是必需的轴突从MTN的投影到NOT的形成,就像它是为MTN的视网膜神经支配。这些新工具允许在AOS中操作特定电路,并表明在多个位置建立AOS连接需要Sema 6A。
The accessory optic system (AOS) detects retinal image slip and reports it to the oculomotor system for reflexive image stabilization. Here, we characterize two Cre lines that permit genetic access to AOS circuits responding to vertical motion. The first (Pcdh9-Cre) labels only one of the four subtypes of ON direction-selective retinal ganglion cells (ON-DS RGCs), those preferring ventral retinal motion. Their axons diverge from the optic tract just behind the chiasm and selectively innervate the medial terminal nucleus (MTN) of the AOS. Unlike most RGC subtypes examined, they survive after optic nerve crush. The second Cre-driver line (Pdzk1ip1-Cre) labels postsynaptic neurons in the MTN. These project predominantly to the other major terminal nucleus of the AOS, the nucleus of the optic tract (NOT). We find that the transmembrane protein semaphorin 6A (Sema6A) is required for the formation of axonal projections from the MTN to the NOT, just as it is for the retinal innervation of the MTN. These new tools permit manipulation of specific circuits in the AOS and show that Sema6A is required for establishing AOS connections in multiple locations.
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