Pax6 controls centriole maturation in cortical progenitors through Odf2

Area of Science:

• Neuroscience
• Cell Biology
• Developmental Biology

Background:

• Radial glial cells (RGCs) generate cortical neurons in the dorsal telencephalon.
• Pax6, a key transcription factor, specifies RGC fate.
• Centrosomes are vital for cell division and cilia formation.

Purpose of the Study:

• To investigate the role of transcription factor Pax6 in centrosome assembly.
• To elucidate the molecular mechanisms underlying centrosome dysfunction in Pax6-deficient developing cortex.

Main Methods:

• Analysis of centrosome structure in Pax6-deficient (Sey/Sey) mouse cortex.
• Investigation of primary cilia formation in radial glial cells.
• Assessment of cell cycle progression and nuclear migration.
• Examination of Odf2 gene regulation by Pax6.

Main Results:

• Pax6 deficiency leads to defects in mother centriole appendage assembly and incomplete centrosome maturation.
• Radial glial cells in Sey/Sey mutants fail to form primary cilia.
• RGCs detach from the ventricular surface, disrupting nuclear migration and causing premature mitotic exit.
• Pax6 directly regulates the Odf2 gene, essential for mother centriole assembly.

Conclusions:

• Pax6 plays a critical role in the structural assembly of interphase centrosomes.
• Dysfunctional centrosomes in Pax6-deficient RGCs contribute to observed developmental defects in the cortex.
• This study reveals a molecular link between Pax6, Odf2, and centrosome integrity during cortical development.