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Racgap1 knockdown results in cells with multiple cilia due to cytokinesis failure
Basudha Basu1, Alice V R Lake1, Becky China1
1Division of Molecular Medicine, Leeds Institute of Medical Research, University of Leeds, Leeds, UK.
Annals of Human Genetics
|September 29, 2023
Summary
Supernumerary primary cilia arise from cytokinesis failure, not cell cycle errors. Loss of RACGAP1 causes multi-ciliation, highlighting a link between cell division and centrosome signaling.
Area of Science:
- Cell Biology
- Genetics
- Molecular Biology
Background:
- Mammalian cells typically possess a single primary cilium, crucial for cellular signaling.
- Mechanisms leading to multiple primary cilia per cell (supernumerary cilia) are poorly understood.
Purpose of the Study:
- To identify genes whose knockdown results in the formation of supernumerary primary cilia.
- To elucidate the mechanisms underlying aberrant ciliogenesis.
Main Methods:
- Re-analysis of a whole-genome siRNA screen for ciliogenesis genes.
- Validation of candidate gene knockdowns in multiple cell lines.
- Live cell imaging to observe cilia formation and cell division.
Main Results:
- Identified siRNA knockdowns causing significant supernumerary cilia formation.
- RACGAP1, a centralspindlin complex component, was the strongest hit.
- Loss of RACGAP1 led to cytokinesis failure, multinucleation, and subsequent supernumerary cilia.
- Cilia signaling mechanisms do not distinguish between normal and supernumerary centrosomes.
Conclusions:
- Aberrant ciliogenesis is decoupled from cell cycle regulation.
- Cytokinesis failure is a primary cause of supernumerary cilia formation.
- Findings have implications for diseases involving centrosome amplification.
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