Abstract
During axon pathfinding, growth cones commonly show changes in sensitivity to guidance cues that follow a cell-intrinsic timetable. The cellular timer mechanisms that regulate such changes are, however, poorly understood. Here we have investigated microRNAs (miRNAs) in the timing control of sensitivity to the semaphorin Sema3A in Xenopus laevis retinal ganglion cell (RGC) growth cones. A developmental profiling screen identified miR-124 as a candidate timer. Loss of miR-124 delayed the onset of Sema3A sensitivity and concomitant neuropilin-1 (NRP1) receptor expression and caused cell-autonomous pathfinding errors. CoREST, a cofactor of a NRP1 repressor, was newly identified as a target and mediator of miR-124 for this highly specific temporal aspect of RGC growth cone responsiveness. Our findings indicate that miR-124 is important in regulating the intrinsic temporal changes in RGC growth cone sensitivity and suggest that miRNAs may act broadly as linear timers in vertebrate neuronal development.
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Acknowledgements
The authors wish to thank J. Woolford for her contribution to the analysis of high-throughput sequencing data, H. Lynn for help on cloning and M. Wood for participation in collapse analysis. We also thank A. Dwivedy, L. Strochlic, J. Falk, K. Leung, M. Agathocleous, A. Lin, S. McFarlane and A. Almeida for technical assistance. We thank W. Harris, A.C. Lee, J. Yoon and M. Agathocleous for critically reading the manuscript, as well as all the members of the Harris/Holt laboratory for their input. This work was supported by postdoctoral fellowships from the National Research Council of Canada (M.-L.B.) and Alberta Heritage Foundation for Medical Research (M.-L.B.), by Wellcome Trust Programme and UK Medical Research Council grants (C.E.H.) and by a European Framework 6 grant (SIROCCO) (E.A.M.).
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C.E.H. and M.-L.B. conceived the project. M.-L.B. performed most of the experiments and data analysis. M.-L.B., K.H.Z., C.A.-G., J.A., C.B. and L.D.G. participated in profiling experiments and analyses. K.H.Z. contributed to Slit2 and LPA collapse assays. C.A.-G. determined the putative targets of miR-124. A.M. performed ISH on cryosections of wild-type Xenopus. E.A.M. designed and discussed profiling experiments. M.-L.B. and C.E.H. wrote the manuscript.
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Baudet, ML., Zivraj, K., Abreu-Goodger, C. et al. miR-124 acts through CoREST to control onset of Sema3A sensitivity in navigating retinal growth cones. Nat Neurosci 15, 29–38 (2012). https://doi.org/10.1038/nn.2979
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DOI: https://doi.org/10.1038/nn.2979
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