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Functional and Morphological Assessment of Diaphragm Innervation by Phrenic Motor Neurons
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Phrenic-specific transcriptional programs shape respiratory motor output.

Alicia N Vagnozzi1, Kiran Garg1, Carola Dewitz2

  • 1Department of Neurosciences, Case Western Reserve University School of Medicine, Cleveland, United States.

Elife
|January 17, 2020
PubMed
Summary

Hox5 genes are crucial for motor neuron (MN) function, ensuring coordinated breathing by connecting phrenic MNs to inhibitory neurons. Loss of Hox5 leads to erratic breathing patterns and lifelong respiratory issues in mice.

Keywords:
Hox5 genesPMC (phrenic motor column)breathingcadherinsdevelopmental biologyinhibitionmouseneurosciencephrenic motor neuronsrespiration

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • Precise motor neuron (MN) activation patterns are vital for motor control.
  • Molecular mechanisms governing specific MN activity patterns remain largely unknown.
  • Phrenic MNs control breathing by firing in a specific pattern for diaphragm contraction.

Purpose of the Study:

  • To investigate the role of Hox5 transcription factors in shaping phrenic MN output.
  • To elucidate how Hox5 genes influence MN connectivity and respiratory function.

Main Methods:

  • Studied the effects of Hox5 gene absence in mice.
  • Analyzed phrenic MN organization, dendritic topography, and firing patterns.
  • Investigated the regulation of cell adhesion programs by Hox5.

Main Results:

  • Hox5 genes connect phrenic MNs to inhibitory premotor neurons.
  • Hox5 regulates phrenic MN organization and dendritic structure via cell adhesion.
  • Absence of Hox5 leads to asynchronous phrenic MN firing and loss of inhibition.
  • Mice lacking Hox5 in MNs display abnormal respiratory behavior.

Conclusions:

  • Hox5 transcription factors are essential for establishing proper phrenic MN connectivity and function.
  • MN-intrinsic transcriptional programs, like those involving Hox5, shape motor output patterns by orchestrating connectivity.
  • Dysregulation of Hox5 impacts respiratory control, highlighting its importance in neural circuit development.