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CDK5RAP2 regulates centriole engagement and cohesion in mice
Jose A Barrera1, Ling-Rong Kao, Robert E Hammer
1Department of Pediatrics, The University of Texas Southwestern Medical Center at Dallas, Dallas, TX 75390, USA.
Developmental Cell
|July 15, 2010
Summary
Centriole engagement is crucial for cell cycle control. Loss of CDK5RAP2 protein disrupts centriole cohesion, leading to centriole amplification and multipolar spindles in cells.
Area of Science:
- Cell Biology
- Centrosome Biology
- Molecular Mechanisms
Background:
- Centriole duplication is tightly regulated, occurring once per cell cycle to ensure two centrosomes per cell.
- Disengagement of mother-daughter centrioles is thought to trigger the next duplication cycle.
- The molecular basis for maintaining centriole engagement remains poorly understood.
Purpose of the Study:
- To investigate the role of CDK5RAP2 in regulating centriole engagement and duplication.
- To understand the molecular mechanisms underlying centriole cohesion and replication control.
Main Methods:
- Studied CDK5RAP2 loss-of-function in mouse models.
- Analyzed centriole number, engagement status, and centrosome structure.
- Observed mitotic spindle formation in mutant cells.
Main Results:
- CDK5RAP2 deficiency results in centriole amplification, with many unpaired centrioles and increased daughter-daughter pairs.
- Loss of CDK5RAP2 impairs centriole engagement and cohesion, licensing excessive replication.
- Mutant cells exhibit multipolar spindles due to amplified centrosomes and form multiple primary cilia from excess mother centrioles.
Conclusions:
- CDK5RAP2 is essential for maintaining centriole engagement and cohesion.
- Proper centriole engagement by CDK5RAP2 restricts centriole replication to once per cell cycle.
- Dysregulation of CDK5RAP2 impacts centrosome integrity, leading to mitotic abnormalities and ciliogenesis defects.
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