DEPDC1B coordinates de-adhesion events and cell-cycle progression at mitosis

Area of Science:

• Cell Biology
• Molecular Biology
• Developmental Biology

Background:

• Cell rounding, detachment, and increased rigidity are hallmarks of mitosis.
• Dismantling of focal adhesions (FAs) is critical for these mitotic events.
• The link between mitotic reshaping and commitment to divide remains unclear.

Purpose of the Study:

• To investigate the role of DEPDC1B in coordinating cell adhesion and cell-cycle progression during mitosis.
• To elucidate the molecular mechanism by which DEPDC1B regulates focal adhesion dynamics.
• To examine the in vivo relevance of the DEPDC1B signaling pathway in developmental processes.

Main Methods:

• Protein interaction studies to define the DEPDC1B/RhoA/PTPRF complex.
• Cell-based assays to observe focal adhesion dynamics and cell morphology.
• Zebrafish developmental studies to assess mitotic dynamics in vivo.

Main Results:

• DEPDC1B accumulates in G2 and inhibits a RhoA-signaling complex involving PTPRF at focal adhesions.
• DEPDC1B competes with RhoA for PTPRF interaction, promoting FA dismantling.
• The DEPDC1B/RhoA/PTPRF axis controls mitotic dynamics during zebrafish development.

Conclusions:

• DEPDC1B is a key regulator coordinating focal adhesion disassembly with cell-cycle progression.
• This adhesion-dependent signaling pathway is essential for proper mitotic reshaping and development.
• The findings reveal a novel mechanism linking cell adhesion to cell division control.