The Celsr3-Kif2a axis directs neuronal migration in the postnatal brain

Area of Science:

• Neuroscience
• Cell Biology
• Developmental Biology

Background:

• Neuronal migration is crucial for forming functional brain circuits.
• The mechanisms directing tangential migration of neuroblasts remain poorly understood.
• Cytoskeletal remodeling, especially in the leading process, is vital for neuronal migration.

Purpose of the Study:

• To investigate the role of Celsr3 in directing neuroblast migration from the subventricular zone to the olfactory bulb.
• To elucidate the molecular mechanisms underlying Celsr3-mediated neuronal migration directionality.

Main Methods:

• Utilized Celsr3-forebrain conditional knockout mice to study neuroblast migration.
• Analyzed neuroblast morphology, leading process dynamics, and microtubule growth rates.
• Investigated the physical interaction between Celsr3 and Kif2a using biochemical assays.
• Generated Kif2a conditional knockout mice to compare phenotypes.

Main Results:

• Celsr3 knockout mice showed impaired neuroblast directionality and reduced olfactory bulb colonization.
• Celsr3-deficient neuroblasts displayed abnormal leading process branching and decreased microtubule growth.
• Celsr3 physically interacts with Kif2a, a microtubule depolymerizing protein.
• Kif2a inactivation in the forebrain mimicked the Celsr3 knockout phenotype.

Conclusions:

• Celsr3 is essential for orienting neuroblast migration in the postnatal brain.
• Celsr3 and Kif2a cooperate to ensure directional tangential migration of neuroblasts.
• This study reveals a novel mechanism controlling neuronal migration specificity.