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Crossing the Border: Molecular Control of Motor Axon Exit

期刊

INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 12, 期 12, 页码 8539-8561

出版社

MDPI
DOI: 10.3390/ijms12128539

关键词

motor axon exit; axon pathfinding; spinal cord; motor exit point; dorsally-exiting motor neuron; ventrally-exiting motor neuron; Nkx2.9; Robo; Slit

资金

  1. NICHD
  2. National Institutes of Health (NIH) [R56NS038505, R01NS038505]
  3. Lucille Kimmel Scholarship
  4. SFN

向作者/读者索取更多资源

Living organisms heavily rely on the function of motor circuits for their survival and for adapting to ever-changing environments. Unique among central nervous system (CNS) neurons, motor neurons (MNs) project their axons out of the CNS. Once in the periphery, motor axons navigate along highly stereotyped trajectories, often at considerable distances from their cell bodies, to innervate appropriate muscle targets. A key decision made by pathfinding motor axons is whether to exit the CNS through dorsal or ventral motor exit points (MEPs). In contrast to the major advances made in understanding the mechanisms that regulate the specification of MN subtypes and the innervation of limb muscles, remarkably little is known about how MN axons project out of the CNS. Nevertheless, a limited number of studies, mainly in Drosophila, have identified transcription factors, and in some cases candidate downstream effector molecules, that are required for motor axons to exit the spinal cord. Notably, specialized neural crest cell derivatives, referred to as Boundary Cap (BC) cells, pre-figure and demarcate MEPs in vertebrates. Surprisingly, however, BC cells are not required for MN axon exit, but rather restrict MN cell bodies from ectopically migrating along their axons out of the CNS. Here, we describe the small set of studies that have addressed motor axon exit in Drosophila and vertebrates, and discuss our fragmentary knowledge of the mechanisms, which guide motor axons out of the CNS.

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