Pcdh20 is a POU2F3 target gene required for proper tuft cell microvillus formation
Biorxiv : the Preprint Server for Biology
|April 1, 2025
Summary
Protocadherin 20 (PCDH20) is crucial for the structure of tuft cell microvilli, potentially enabling mechanotransduction. This POU2F3 target gene maintains the microvillar apparatus in these solitary chemosensory cells.
Area of Science:
- Cell Biology
- Sensory Neuroscience
- Molecular Biology
Background:
- Tuft cells possess unique microvilli, potentially analogous to hair cell stereocilia, suggesting a role in mechanotransduction.
- The transcription factor POU2F3 regulates tuft cell development, but its role in forming the microvillar apparatus is unclear.
Purpose of the Study:
- To investigate the molecular mechanisms underlying tuft cell microvillar formation.
- To identify genes regulated by POU2F3 in tuft cells and their function.
- To explore the potential mechanotransduction role of tuft cell microvilli.
Main Methods:
- POU2F3 ChIP-seq on isolated tuft cells.
- Comparative analysis with cochlear hair cell transcriptomes.
- Immunogold labeling and electron microscopy.
- PCDH20 knockdown in mice.
Main Results:
- Identified shared structural genes between tuft and hair cells, including protocadherin 20 (PCDH20).
- Localized PCDH20 to intermicrovillar linkages in tuft cells.
- PCDH20 knockdown led to impaired microvilli formation and structural defects.
Conclusions:
- PCDH20 is a POU2F3 target gene essential for maintaining the tuft cell microvillar apparatus.
- The structural integrity provided by PCDH20 may facilitate mechanotransduction in tuft cells.
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