Robo1 and Robo2 have distinct roles in pioneer longitudinal axon guidance.

Robo1 and Robo2 have distinct roles in pioneer longitudinal axon guidance.
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ROBO1和ROBO2在先驱纵向轴突指导中具有不同的作用。

DOI:
10.1016/j.ydbio.2011.07.025
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发表时间:
2011-10-01
影响因子:
2.7
通讯作者:
Mastick GS
Mastick GS
中科院分区:
生物学3区
文献类型:
--
作者:
Kim M;Roesener AP;Mendonca PR;Mastick GS

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先锋纵向轴突平行于底板长距离生长,并使用从底板释放的引导分子精确地保持它们的位置。两个受体,Robo 1和Robo 2,是关键的纵向轴突引导的狭缝家族的化学排斥。先前的研究表明,Robo 1 −/−;2−/−双突变小鼠胚胎的腹侧和背侧纵束都有破坏。然而,每个Robo亚型的作用仍然不清楚,因为Robo 1或2个单一突变体有轻微或没有错误。在这里,我们利用更敏感的遗传策略来降低Robo水平,以确定Robo 1和2亚型的任何单独功能。我们发现,Robo 1是引导腹侧束轴突的主要受体,并防止中线交叉。相比之下,Robo 2是在背侧束内引导轴突的主要受体。Robo 2还具有将神经元细胞体从底板排斥的独特功能。因此,虽然Robo 1和Robo 2在引导纵向轴突方面有一些遗传重叠,但每个亚型在特定的纵向轴突群体中具有不同的功能。
Pioneer longitudinal axons grow long distances parallel to the floor plate and precisely maintain their positions using guidance molecules released from the floor plate. Two receptors, Robo1 and Robo2, are critical for longitudinal axon guidance by the Slit family of chemorepellents. Previous studies showed that Robo1−/−;2−/− double mutant mouse embryos have disruptions in both ventral and dorsal longitudinal tracts. However, the role of each Robo isoform remained unclear, because Robo 1 or 2 single mutants have mild or no errors. Here we utilized a more sensitive genetic strategy to reduce Robo levels for determining any separate functions of the Robo1 and 2 isoforms. We found that Robo1 is the predominant receptor for guiding axons in ventral tracts and prevents midline crossing. In contrast, Robo2 is the main receptor for directing axons within dorsal tracts. Robo2 also has a distinct function in repelling neuron cell bodies from the floor plate. Therefore, while Robo1 and 2 have some genetic overlap to cooperate in guiding longitudinal axons, each isoform has distinct functions in specific longitudinal axon populations.
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