Etv1 Controls the Establishment of Non-overlapping Motor Innervation of Neighboring Facial Muscles during Development.

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ID: 59218
2019
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Abstract
The somatotopic motor-neuron projections onto their cognate target muscles are essential for coordinated movement, but how that occurs for facial motor circuits, which have critical roles in respiratory and interactive behaviors, is poorly understood. We report extensive molecular heterogeneity in developing facial motor neurons in the mouse and identify markers of subnuclei and the motor pools innervating specific facial muscles. Facial subnuclei differentiate during migration to the ventral hindbrain, where neurons with progressively later birth dates-and evolutionarily more recent functions-settle in more-lateral positions. One subpopulation marker, ETV1, determines both positional and target muscle identity for neurons of the dorsolateral (DL) subnucleus. In Etv1 mutants, many markers of DL differentiation are lost, and individual motor pools project indifferently to their own and neighboring muscle targets. The resulting aberrant activation patterns are reminiscent of the facial synkinesis observed in humans after facial nerve injury.
Reference Key
tenney2019etv1cell Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Tenney, Alan P;Livet, Jean;Belton, Timothy;Prochazkova, Michaela;Pearson, Erica M;Whitman, Mary C;Kulkarni, Ashok B;Engle, Elizabeth C;Henderson, Christopher E;
Journal Cell reports
Year 2019
DOI
S2211-1247(19)31133-7
URL
Keywords
axon guidance etv1 facial nerve cranial nerve facial nucleus motor neuron motor pool neuronal migration somatotopy synkinesis

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