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Multicilin promotes centriole assembly and ciliogenesis during multiciliate cell differentiation
J L Stubbs1, E K Vladar, J D Axelrod
1Molecular Neurobiology Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037, USA.
Nature Cell Biology
|January 11, 2012
Summary
Multicilin initiates multiciliate cell differentiation by activating genes for motile cilia and centriole assembly. This coiled-coil protein is essential for forming these specialized cells in various tissues.
Area of Science:
- Cell Biology
- Developmental Biology
- Epithelial Biology
Background:
- Multiciliate cells are crucial for fluid transport in organs like the respiratory system.
- Their formation involves complex ciliogenesis, but the initiation triggers remain unclear.
- Notch signaling is known to inhibit multiciliate cell development.
Purpose of the Study:
- To identify factors initiating multiciliate cell differentiation.
- To understand how progenitors overcome Notch-mediated inhibition.
- To elucidate the molecular mechanisms driving motile ciliogenesis.
Main Methods:
- Identification and functional analysis of the multicilin protein in Xenopus and mouse models.
- Investigating multicilin's role in gene expression and protein localization.
- Utilizing ectopic expression and gene inhibition studies.
Main Results:
- Multicilin, a Notch-regulated protein, is essential for multiciliate cell formation.
- Inhibition of multicilin blocks differentiation, while its ectopic expression induces it.
- Multicilin directly activates key genes, including foxj1 and centriole assembly genes, in the nucleus.
Conclusions:
- Multicilin is a key initiator of multiciliate cell differentiation across diverse tissues.
- It coordinates transcriptional programs for motile ciliogenesis and centriole biogenesis.
- This discovery provides insight into the regulation of specialized epithelial cell development.
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