| First Author | Verhagen MG | Year | 2023 |
| Journal | bioRxiv | Mgi Jnum | J:350014 |
| Mgi Id | MGI:7660961 | Doi | 10.1101/2023.11.06.565851 |
| Citation | Verhagen MG, et al. (2023) Generation and characterization of Sema6a delta cyt conditional knockout mice. bioRxiv |
| abstractText | The axon guidance molecule Semaphorin-6A (SEMA6A) plays a key role during nervous system development. SEMA6A, classically known as a ligand for Plexin-A2 and -A4, is a transmembrane protein that can also elicit signaling via its intracellular domain in vitro. However, the physiological relevance of this âreverseâ signaling route is largely unknown. We generated a new transgenic mouse model, Sema6a delta cytfl/fl, in which the cytosolic part of SEMA6A can be conditionally removed using Cre-recombination. Upon Sema6aÎcyt mutation, SEMA6A can only act as a ligand and reverse signaling is perturbed. Germline deletion of SEMA6Aâs intracellular part results in developmental defects in axon pathfinding and neuron migration that partially phenocopy defects observed in full Sema6a knockout mice. These defects include disorganization of the anterior commissure, piriform cortex, lateral olfactory tract, thalamocortical and corticospinal white matter tracts, and defected neuron migration in the neocortex and cerebellum. Intriguingly, the hippocampal malformation described in Sema6a full knockout mice was not reproduced, suggesting a specific role for SEMA6A forward signaling in hippocampal development. Our results indicate that the intracellular domain of SEMA6A is essential for proper axon targeting and neuron migration, and provide the first proof of a SEMA6A reverse signaling pathway in vivo. |
