Developmental changes in interkinetic nuclear migration dynamics with respect to cell-cycle progression in the mouse...

Area of Science:

• Developmental Neuroscience
• Cell Biology
• Genetics

Background:

• Apical progenitors in the ventricular zone (VZ) undergo interkinetic nuclear migration (INM) during cerebral corticogenesis.
• The relationship between INM dynamics and the cell cycle in these progenitors is not fully understood across different developmental stages.

Purpose of the Study:

• To investigate the dynamic relationship between INM and cell-cycle progression in mouse apical progenitors.
• To determine how this relationship changes during distinct phases of mouse cerebral corticogenesis.

Main Methods:

• Utilized cell-cycle phase-specific immunostaining.
• Employed real-time imaging of proliferating cell nuclear antigen (PCNA)-expressing apical progenitors.
• Performed experimental manipulation by overexpressing cyclin E to shorten cell-cycle duration.

Main Results:

• Observed stage-specific alterations in INM dynamics relative to cell-cycle phases.
• At early stages, apical nuclear movement correlated with the G2 phase.
• At midcorticogenesis, INM initiated during the S phase, preceding G2 entry, with distinct velocities for S and G2 phases.
• Shortening the cell cycle via cyclin E overexpression altered INM behavior congruently.

Conclusions:

• INM dynamics in apical progenitors are significantly influenced by cell-cycle progression.
• The timing and velocity of INM are subject to cell-cycle related constraints, varying with developmental stage.