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Related Experiment Video

Updated: Sep 5, 2025

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Peripheral nerve development in zebrafish requires muscle patterning by tcf15/paraxis.

Lauren E Limbach1, Rocky L Penick1, Rudy S Casseday1

  • 1Department of Neuroscience, Kenyon College, Gambier, OH, USA.

Developmental Biology
|July 12, 2022
PubMed
Summary
This summary is machine-generated.

Muscle-derived transcription factor TCF15 (basic helix-loop-helix) is crucial for peripheral nervous system (PNS) development. Loss of TCF15 disrupts motor and sensory nerve extension and cell positioning in zebrafish.

Keywords:
Lateral line nerveMyelinParaxial mesodermSchwann cellsZebrafish

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • The vertebrate peripheral nervous system (PNS) requires precise axon-glial patterning for function.
  • Extracellular cues guide nerve development, but the molecular players are not fully understood.
  • Zebrafish mutants with peripheral nerve defects offer insights into PNS development.

Purpose of the Study:

  • To identify novel genetic factors regulating peripheral nervous system (PNS) patterning.
  • To investigate the role of the transcription factor tcf15 in PNS development.

Main Methods:

  • Characterization of a novel zebrafish mutant (stl159) with PNS patterning defects.
  • CRISPR-Cas9 genome editing to target the tcf15 gene.
  • Analysis of motor and sensory nerve extension, neuromast, and melanocyte positioning.

Main Results:

  • The stl159 mutant exhibits abnormal PNS patterning, including motor and sensory nerve extension defects.
  • The genetic lesion in stl159 mutants was identified as the transcription factor tcf15.
  • Loss of tcf15 function via CRISPR-Cas9 recapitulated the observed PNS abnormalities.
  • tcf15 is expressed in muscle, not neurons or glia, suggesting a non-cell-autonomous role.

Conclusions:

  • The transcription factor tcf15, expressed in developing muscle, is essential for normal peripheral nervous system (PNS) patterning.
  • Muscle-derived tcf15 likely regulates extracellular cues that guide nerve development.
  • This study highlights the critical contribution of muscle-derived factors to PNS development.