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CSlo encodes calcium-activated potassium channels in the chick's cochlea
G J Jiang1, M Zidanic, R L Michaels
1Department of Otolaryngology, Head and Neck Surgery, John Hopkins University School of Medicine, Baltimore, MD, USA.
Proceedings. Biological Sciences
|May 22, 1997
Summary
Researchers identified a chick BK potassium channel (cSlo1) crucial for cochlear hair cell function. This calcium-activated channel shares high similarity with mammalian Slo channels, aiding auditory system research.
Area of Science:
- Neuroscience
- Molecular Biology
- Otolaryngology
Background:
- Large conductance, calcium-activated (BK) potassium channels regulate cochlear hair cell excitability.
- Mammalian Slo channels, homologous to Drosophila 'slowpoke', encode BK channels.
Purpose of the Study:
- To isolate and characterize a chick homologue of the BK potassium channel.
- To investigate the role of this channel in avian cochlear hair cells.
Main Methods:
- Homology screening of a chick cochlear cDNA library with mouse Slo cDNA.
- Reverse transcriptase polymerase chain reaction (RT-PCR) for expression analysis.
- Transient transfection of HIEK 293 cells to study channel function.
Main Results:
- A full-length clone, cSlo1, was isolated with >90% amino acid identity to mouse Slo.
- cSlo1 expression was confirmed in the chick basilar papilla hair cell epithelium.
- Transfected cSlo1 encoded a calcium-dependent potassium channel with large conductance (224 pS at +60 mV).
- Channel activity was sensitive to voltage, calcium, scorpion toxin, and tetraethyl ammonium.
Conclusions:
- cSlo1 likely encodes the BK-type calcium-activated potassium channel in cochlear hair cells.
- This finding provides insights into the molecular basis of auditory transduction in birds.