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Updated: Jun 26, 2026
07:07
Evaluation of Planar-Cell-Polarity Phenotypes in Ciliopathy Mouse Mutant Cochlea
Published on: February 21, 2016
RGS22 is a metazoa-specific radial spoke component required for coordinated ciliary beating
Anxuan Fang1,2, Jiajun Luo3, Haomang Xu2
1Department of Burns and Wound Care Center, the Second Affiliated Hospital, Zhejiang University School of Medicine, Zhejiang University, Hangzhou, China.
Nature Communications
|June 24, 2026
Summary
RGS22 is a newly identified metazoa-specific protein crucial for radial spoke structure in motile cilia. Its absence causes defects in ciliary coordination, leading to hydrocephalus.
Area of Science:
- Cell Biology
- Developmental Biology
- Biochemistry
Background:
- Metazoan epithelia utilize coordinated motile cilia for unidirectional fluid flow.
- Radial spokes (RSs) are key for mechano-signal transduction in cilia.
- The evolutionary acquisition of metazoa-specific RS subunits is largely unknown.
Purpose of the Study:
- To investigate potential metazoa-specific subunits of radial spokes.
- To determine the function of RGS22 in ciliary structure and function.
Main Methods:
- Generation of Rgs22-deficient mice.
- Transmission electron microscopy of cilia.
- Analysis of ciliary beat coordination and basal body polarity.
- Assessment of hydrocephalus development.
Main Results:
- RGS22 identified as a metazoa-specific component of RS1/2 complexes.
- Rgs22 deficiency causes RS1 deformation and outer dynein arm disorganization.
- Impaired ciliary planar polarity, unsynchronized beating, and disrupted basal body rotation observed.
- Progressive ciliary loss, shortening, and postnatal hydrocephalus developed in Rgs22-deficient mice.
Conclusions:
- RGS22 is an animal-lineage RS1/2 component essential for normal radial spoke architecture.
- RGS22 is required for tissue-level ciliary motility and coordination.
- Defects in RGS22 function are linked to hydrocephalus.
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