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Coupling of NF-protocadherin signaling to axon guidance by cue-induced translation

Abstract

Cell adhesion molecules and diffusible cues both regulate axon pathfinding, yet how these two modes of signaling interact is poorly understood. The homophilic cell adhesion molecule NF-protocadherin (NFPC) is expressed in the mid-dorsal optic tract neuroepithelium and in the axons of developing retinal ganglion cells (RGC) in Xenopus laevis. Here we report that targeted disruption of NFPC function in RGC axons or the optic tract neuroepithelium results in unexpectedly localized pathfinding defects at the caudal turn in the mid-optic tract. Semaphorin 3A (Sema3A), which lies adjacent to this turn, stimulates rapid, protein synthesis–dependent increases in growth cone NFPC and its cofactor, TAF1, in vitro. In vivo, growth cones exhibit marked increases in NFPC translation reporter activity in this mid-optic tract region that are attenuated by blocking neuropilin-1 function. Our results suggest that translation-linked coupling between regionally localized diffusible cues and cell adhesion can help axons navigate discrete segments of the pathway.

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Figure 1: Dominant negative NFPC signaling disrupts retinal axon growth and guidance in the optic tract.
Figure 2: Depletion of NFPC or TAF1 disrupts retinal axon guidance in the optic tract.
Figure 3: Live imaging of retinal axons shows that NFPC function is required at the caudal turn.
Figure 4: Homophilic NFPC interactions are required at the caudal turn.
Figure 5: NFPC is required in the neuroepithelium of the optic tract for guidance.
Figure 6: Sema3A increases NFPC levels in retinal growth cones.
Figure 7: Sema3A induces local translation of NFPC mRNA.
Figure 8: In vivo imaging shows that NFPC-translation reporter activity is upregulated at the caudal turn and depends partly on NP-1–Sema signaling.

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Acknowledgements

We thank R. Bradley (Montana State University) for kind gifts of NFPC antibody and sharing constructs, S. McFarlane for advice on the Slit1 in situ hybridization, and F. van Horck for NFPC in situ hybridization data. We thank A. Pungaliya, A. McNabb, T. Dyl, G. Stooke-Vaughan, C. Purmann, K. Holmes, H. Lynn, G. Lupo, D. Maurus and N. Coutts for technical assistance. We thank members of the Harris and Holt laboratories for assistance and comments on the manuscript. This work was funded by Wellcome Trust Programme grant no. 085314/Z/08/Z (C.E.H., W.A.H.), a UK Medical Research Council Doctoral Training Grant (L.C.L.), a Wellcome Trust Studentship (V.U.), the National Science and Engineering Research Council of Canada and the Alberta Heritage Foundation for Medical Research (M-L.B.), a UK Medical Research Council studentship (T.G.B.) and an EMBO fellowship (A.C.L.).

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Authors and Affiliations

Authors

Contributions

L.C.L., C.E.H. and W.A.H. conceived the project, designed the experiments and wrote the manuscript. L.C.L. produced the constructs and peptides, and generated and analyzed all the data in Figures 1,2,3,4,5,6,7, and Supplementary Figures 1–7 unless otherwise stated. V.U. and T.G.B. performed and analyzed the in vivo Kaede translation reporter experiments in Figure 8a,b. V.U. conducted the combined antibody in vivo Kaede reporter experiments in Figure 8c,d and A.D. assisted with in vivo antibody experiments in Supplementary Figure 4e. M.-L.B. performed in situ hybridization in Supplementary Figure 3. A.C.L. performed the western blots in Supplementary Figure 1a,b and the cycloheximide experiments in Supplementary Figure 5n.

Corresponding author

Correspondence to Christine E Holt.

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The authors declare no competing financial interests.

Supplementary information

Supplementary Text and Figures

Supplementary Figures 1–8 and Supplementary Table 1 (PDF 21990 kb)

Supplementary Video 1

Timelapse movie of a GAP-GFP axon. An example of a timelapse movie of GAP-GFP axons navigating through the Xenopus optic tract (lateral view), from which the kymograph in Figure 3a was derived. Each frame represents 3 min elapsed and the movie is played at 5 frames per second. This movie was acquired at 20× magnification. Scale bar, 10 μm. (MOV 517 kb)

Supplementary Video 2

Timelapse movie of a NFΔEeGFP axon. An example of a timelapse movie of an NFΔEeGFP axon navigating through the Xenopus optic tract, from which the kymograph in Figure 3b was derived. Each frame represents 3 min elapsed and the movie is played at 5 frames per second. The growth cone has stalled at the caudal turn, and once it has made the turn growth in the dorsal tract is appreciably slower. This movie was acquired at 20× magnification. Scale bar, 10 μm. (MOV 574 kb)

Supplementary Video 3

Timelapse movie of Kaede-NFPC-3′UTR translation activity in the ventral optic tract. An example of a retinal growth cone in the ventral optic tract (arrowheads), expressing Kaede-NFPC-3′UTR, in which the green signal is not recovered over the course of 30 min, indicative of the absence of NFPC-3′UTR–driven translation in the ventral optic tract. Each frame represents 5 min and the movie is played at 1.5 frames per second. The timelapse was acquired at 60× magnification. Scale bar, 5 μm. (MOV 329 kb)

Supplementary Video 4

Timelapse movie of Kaede-NFPC-3′UTR translation activity in the mid-optic tract. Photoconversion and post-conversion imaging of Kaede in retinal growth cones expressing Kaede-NFPC-′UTR in the mid-optic tract. Arrowheads highlight a single growth cone in which the green signal recovers over the course of 30 min after photoconversion, indicative of the translation of Kaede-NFPC-3′UTR. Magnification and playback speed are as in Supplementary Movie 3. (MOV 330 kb)

Supplementary Video 5

Timelapse movie of Kaede-NFPC-3′UTR translation in brains treated with a control antibody. An example of a retinal growth cone in mid-optic tract with Kaede-green signal recovery after photoconversion, following incubation with a control (IgG2B) antibody. Magnification and playback speed are as in Supplementary Video 3. (MOV 459 kb)

Supplementary Video 6

Timelapse movie of Kaede-NFPC-3′UTR translation in brains treated with a neuropilin-1 function blocking antibody. An example of a retinal growth cone in mid-optic tract with a reduced level of Kaede-green signal recovery after photoconversion following incubation with a neuropilin-1 function-blocking antibody, indicative of decreased translation of Kaede-NFPC-3′UTR upon anti–NP-1 treatment. Magnification and playback speed are as in Supplementary Video 3. (MOV 361 kb)

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Leung, L., Urbančič, V., Baudet, ML. et al. Coupling of NF-protocadherin signaling to axon guidance by cue-induced translation. Nat Neurosci 16, 166–173 (2013). https://doi.org/10.1038/nn.3290

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