Post‐crossing segment of dI1 commissural axons forms collateral branches to motor neurons in the developing spinal cord |
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| Authors: | Takeshi Kaneyama Ryuichi Shirasaki |
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| Affiliation: | Cellular and Molecular Neurobiology Laboratory, Graduate School of Frontier Biosciences, Osaka University, Suita, Osaka, Japan |
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| Abstract: | The dI1 commissural axons in the developing spinal cord, upon crossing the midline through the floor plate, make a sharp turn to grow rostrally. These post‐crossing axons initially just extend adjacent to the floor plate without entering nearby motor columns. However, it remains poorly characterized how these post‐crossing dI1 axons behave subsequently to this process. In the present study, to address this issue, we examined in detail the behavior of post‐crossing dI1 axons in mice, using the Atoh1 enhancer‐based conditional expression system that enables selective and sparse labeling of individual dI1 axons, together with Hb9 and ChAT immunohistochemistry for precise identification of spinal motor neurons (MNs). We found unexpectedly that the post‐crossing segment of dI1 axons later gave off collateral branches that extended laterally to invade motor columns. Interestingly, these collateral branches emerged at around the time when their primary growth cones initiated invasion into motor columns. In addition, although the length of the laterally growing collateral branches increased with age, the majority of them remained within motor columns. Strikingly, these collateral branches further gave rise to multiple secondary branches in the region of MNs that innervate muscles close to the body axis. Moreover, these axonal branches formed presynaptic terminals on MNs. These observations demonstrate that dI1 commissural neurons develop axonal projection to spinal MNs via collateral branches arising later from the post‐crossing segment of these axons. Our findings thus reveal a previously unrecognized projection of dI1 commissural axons that may contribute directly to generating proper motor output. |
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| Keywords: | Atoh1 enhancer Lhx2 delayed interstitial branching target recognition MMC motor neurons mouse RRID: AB_2715641 RRID: AB_10013361 RRID: AB_2534023 RRID: AB_2135660 RRID: AB_1141518 RRID: AB_2079751 RRID: AB_10692100 RRID: nif‐0000‐30467 |
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