1998/04/01 by Wataru Shoji, Charles S. Yee, John Y. Kuwada · 1 citation
Biochemistry, Genetics and Molecular Biology · Neuroscience · #Axon Guidance and Neuronal Signaling #Developmental Biology and Gene Regulation #Zebrafish Biomedical Research Applications
paper · doi:10.1242/dev.125.7.1275
openalex publication_date 1998/04/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
The semaphorin/collapsin gene family encodes secreted and transmembrane proteins several of which can repulse growth cones. Although the in vitro activity of Semaphorin III/D/Collapsin 1 is clear, recent analyses of two different strains of semaphorin III/D/collapsin 1 knockout mice have generated conflicting findings. In order to clarify the in vivo action of this molecule, we analyzed sema Z1a, a zebrafish homolog of semaphorin III/D/collapsin 1. The expression pattern of sema Z1a suggested that it delimited the pathway of the growth cones of a specific set of sensory neurons, the posterior ganglion of the lateral line, in zebrafish. To examine the in vivo action of this molecule, we analyzed (1) the pathways followed by lateral line growth cones in mutants in which the expression of sema Z1a is altered in an interesting way, (2) response of lateral line growth cones to exogenous Sema Z1a in living embryos, and (3) the pathway followed by lateral line growth cones when Sema Z1a is misexpressed by cells along their normal route. The results suggest that a repulsive action of Sema Z1a helps guide the growth cones of the lateral line along their normal pathway.