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Related Experiment Video

Updated: Sep 28, 2025

Quantitative Immunofluorescence Assay to Measure the Variation in Protein Levels at Centrosomes

Quantitative Immunofluorescence Assay to Measure the Variation in Protein Levels at Centrosomes

Published on: December 20, 2014

Emi2 enables centriole amplification during multiciliated cell differentiation.

Seongjae Kim¹, Yuan-Hung Chien¹, Amy Ryan^2,3

¹Molecular Neurobiology Laboratory, The Salk Institute for Biological Studies, La Jolla, CA, USA.

Science Advances

|April 1, 2022

Summary

This summary is machine-generated.

Emi2 protein controls centriole amplification in multiciliated cells by transiently inhibiting the APC/C complex. This regulation is crucial for activating PLK1 kinase, promoting basal body formation and differentiation.

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Published on: November 11, 2022

Area of Science:

Cell Biology
Developmental Biology
Molecular Biology

Background:

Multiciliated cell (MCC) differentiation involves massive centriole amplification, a complex organelle biogenesis process.
The precise cell cycle regulation required for centriole amplification in MCC progenitors is not fully understood.

Purpose of the Study:

To identify key cell cycle components regulating centriole amplification during MCC differentiation.
To elucidate the role of Emi2 in controlling centriole biogenesis and basal body formation.

Main Methods:

Analysis of emi2 expression in MCC progenitors.
Investigating the interaction between Emi2, APC/C, and PLK1.
Assessing the impact of Emi2 inhibition on centriole amplification and basal body formation.

Main Results:

Emi2 expression is upregulated in MCC progenitors after cell cycle exit.
Emi2 transiently inhibits anaphase-promoting complex/cyclosome (APC/C)^cdh1 activity.
This inhibition is essential for PLK1 activation, promoting centriole disengagement, apical migration, and maturation.
The Emi2-APC/C-PLK1 axis also downregulates gene expression post-differentiation.

Conclusions:

Identified a novel Emi2-APC/C-PLK1 signaling axis that governs centriole amplification and basal body formation.
This axis promotes initial centriole assembly and subsequently terminates the process after differentiation.
Provides critical insights into cell cycle control during specialized cell differentiation.