TY - JOUR T1 - Slit1b-Robo3 Signaling and N-Cadherin Regulate Apical Process Retraction in Developing Retinal Ganglion Cells JF - The Journal of Neuroscience JO - J. Neurosci. SP - 223 LP - 228 DO - 10.1523/JNEUROSCI.2596-11.2012 VL - 32 IS - 1 AU - Grace K. W. Wong AU - Marie-Laure Baudet AU - Caren Norden AU - Louis Leung AU - William A. Harris Y1 - 2012/01/04 UR - http://www.jneurosci.org/content/32/1/223.abstract N2 - When neurons exit the cell cycle after their terminal mitosis, they detach from the apical surface of the neuroepithelium. Despite the fact that this detachment is crucial for further neurogenesis and neuronal migration, the underlying mechanisms are still not understood. Here, taking advantage of the genetics and imaging possibilities of the zebrafish retina as a model system, we show by knockdown experiments that the guidance molecule Slit1b and its receptor Robo3 are required for apical retraction of retinal ganglion cells (RGCs). In contrast, N-cadherin seems to be responsible for maintenance of apical attachment, as expression of dominant-negative N-cadherin causes RGCs to lose apical attachments prematurely and rescues retraction in slit1b morphants. These results suggest that Slit-Robo signaling downregulates N-cadherin activity to allow apical retraction in newly generated RGCs. ER -