The spt-1 mutation alters segmental arrangement and axonal development of identified neurons in the spinal cord of the embryonic zebrafish

Neuron. 1991 May;6(5):767-76. doi: 10.1016/0896-6273(91)90173-w.


We examined the arrangement and development of identified neurons in zebrafish embryos homozygous for the mutation spt-1, which acts autonomously and specifically to alter the development of precursors of trunk segmented mesoderm, resulting in muscle-deficient myotomes. We found that the mutation alters the morphology, number, and arrangement of identified motoneurons. By transplanting identified motoneurons between wild-type and mutant embryos, we found that the effect of the mutation was nonautonomous. We suggest that the segmental arrangement and proper axonal development of motoneurons may result from interactions with segmented mesoderm.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Animals
  • Axons / physiology
  • Cell Count
  • Interneurons / cytology
  • Interneurons / physiology
  • Mesoderm / physiology
  • Motor Neurons / cytology*
  • Motor Neurons / physiology
  • Muscles / embryology
  • Muscles / innervation
  • Mutation*
  • Neurons, Afferent / cytology
  • Neurons, Afferent / physiology
  • Spinal Cord / cytology
  • Spinal Cord / embryology*
  • Zebrafish / embryology*
  • Zebrafish / genetics