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Early forebrain wiring: genetic dissection using conditional Celsr3 mutant mice.

Libing Zhou1, Isabelle Bar, Younès Achouri

  • 1Developmental Neurobiology, Université Catholique de Louvain, 1200 Bruxelles, Belgique.

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Summary
This summary is machine-generated.

Cell adhesion molecule Celsr3 is crucial for mammalian axonal tract formation. Its localized inactivation revealed essential roles in guiding neurons and supporting cells for correct pathway development.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • Axonal tract formation is vital for neural circuit development.
  • The Celsr3 gene plays a known role in brain development.
  • Previous studies indicated Celsr3's importance in axonal guidance.

Purpose of the Study:

  • To investigate the specific roles of Celsr3 in different brain regions during axonal tract formation.
  • To understand how Celsr3 functions in both neurons and surrounding cells.
  • To identify Celsr3-dependent and independent pathways in axonal development.

Main Methods:

  • Generation of a conditional Celsr3 knockout mouse model.
  • Regional inactivation of the Celsr3 gene in specific brain areas (telencephalon, ventral forebrain, cortex).
  • Analysis of axonal tract development, including the anterior commissure and internal capsule.

Main Results:

  • Conditional Celsr3 inactivation in the telencephalon, ventral forebrain, or cortex disrupted specific axonal tracts.
  • Celsr3 is essential in neurons projecting to the anterior commissure and subcerebral targets.
  • Celsr3 is also critical in cells guiding axons through the internal capsule.
  • Cortex-specific inactivation impaired subcerebral projections but not corticothalamic axons, suggesting alternative guidance cues.

Conclusions:

  • Celsr3-mediated interactions between growth cones and guidepost cells are essential for mammalian axonal tract formation.
  • The study provides in vivo evidence for Celsr3's multifaceted role in guiding different axonal populations.
  • Distinct guidance mechanisms exist, with Celsr3-independent cues supporting certain projections like corticothalamic axons.