An inducible multiciliated cell line resolves proteome dynamics and identifies CDK7 as a conserved regulator

Area of Science:

• Cell Biology
• Developmental Biology
• Epithelial Biology

Background:

• Multiciliated cells (MCCs) are vital for fluid transport in vertebrate organs.
• MCC differentiation requires extensive centriole production, but proteome dynamics are poorly understood.
• Existing models limit the study of MCC development.

Purpose of the Study:

• To create a novel inducible model for studying MCC differentiation.
• To investigate proteome dynamics during MCC development.
• To identify novel regulators of MCC differentiation and potential therapeutic targets.

Main Methods:

• Generation of a stable inducible Xenopus A6 kidney epithelial cell line expressing multicilin (MCI).
• Synchronous differentiation of MCCs upon MCI induction.
• Proteomic profiling, custom antibody generation, and super-resolution imaging.
• Characterization of Xenopus deuterosomes.

Main Results:

• The A6-MCI cell line enables synchronous MCC differentiation within 48 hours.
• Detailed proteomic analysis revealed previously unknown regulators of MCC development.
• Deuterosomes, critical for centriole synthesis, were characterized in Xenopus.
• CDK7 was identified as a critical regulator in both Xenopus and human MCC differentiation.

Conclusions:

• The developed A6-MCI cell line is a valuable resource for studying MCC biology.
• The study uncovered novel insights into proteome dynamics during MCC differentiation.
• CDK7 plays a conserved role in MCC differentiation, suggesting it as a potential therapeutic target for motile ciliopathies.