4 years ago

Regulation of Axon Guidance by the Wnt Receptor Ror/CAM-1 in the PVT Guidepost Cell in Caenorhabditis elegans.

Mörck, Yosef, Devkota, Chien
The Caenorhabditis elegans ventral nerve cord (VNC) consists of two asymmetric bundles of neurons and axons that are separated by the midline. How the axons are guided to stay on the correct sides of the midline remains poorly understood. Here we provide evidence that the conserved Wnt signaling pathway along with the Netrin and Robo pathways constitute a combinatorial code for midline guidance of PVP and PVQ axons that extend into the VNC. Combined loss of the Wnts CWN-1, CWN-2 and EGL-20 or loss of the Wnt receptor CAM-1 caused more than 70 % of PVP and PVQ axons to inappropriately cross over from the left side to the right side. Loss of the Frizzled receptor LIN-17 or the planar cell polarity (PCP) protein VANG-1 also caused cross over defects that did not enhance those in the cam-1 mutant, indicating that the proteins function together in midline guidance. Strong cam-1 expression can be detected in the PVQs and the guidepost cell PVT that is located on the midline. However, only when cam-1 is expressed in PVT are the cross over defects of PVP and PVQ rescued, showing that CAM-1 functions non-autonomously in PVT to prevent axons from crossing the midline.

Publisher URL: http://doi.org/10.1534/genetics.117.300375

DOI: 10.1534/genetics.117.300375

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