Mutations in Protocadherin 15 and Cadherin 23 Affect Tip Links and Mechanotransduction in Mammalian Sensory Hair Cells
Author Information
Author(s): Alagramam Kumar N., Goodyear Richard J., Geng Ruishuang, Furness David N., van Aken Alexander F. J., Marcotti Walter, Kros Corné J., Richardson Guy P.
Hypothesis
Do mutations in Pcdh15 and Cdh23 affect the structure and function of hair cell tip links and mechanotransduction?
Conclusion
The study provides genetic evidence that PCDH15 and CDH23 are necessary for the formation and maintenance of tip links in hair cells, which are crucial for normal mechanotransduction.
Supporting Evidence
- Immunocytochemical studies showed that PCDH15 and CDH23 are associated with tip links in hair cells.
- Functional analysis revealed severe disruption of hair-bundle morphology in specific mouse mutants.
- Hair cells from av3J/av3J and v2J/v2J mice showed no loading with FM1-43, indicating loss of mechanotransduction.
- Transducer currents were recorded from all three mutants but were reduced in amplitude and had abnormal directional sensitivity.
- Electron microscopy confirmed the presence of tip links in av6J/av6J mice but not in av3J/av3J or v2J/v2J mice.
Takeaway
This study shows that certain mutations in genes related to hearing can disrupt the tiny links in our ear cells that help us hear, leading to hearing loss.
Methodology
The study involved functional and structural analyses of hair cells from various mouse mutants with specific mutations in Pcdh15 and Cdh23.
Limitations
The study primarily focuses on mouse models, which may not fully replicate human conditions.
Participant Demographics
The study used various mouse mutants, specifically Pcdh15av3J, Pcdh15av6J, and Cdh23v2J.
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website