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Updated: Jun 1, 2026

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Data Acquisition and Analysis In Brainstem Evoked Response Audiometry In Mice
Published on: May 10, 2019
Cav1.3 calcium channels are required for normal development of the auditory brainstem
Jan J Hirtz1, Michael Boesen, Nadine Braun
1Department of Biology, University of Kaiserslautern, D-67653 Kaiserslautern, Germany.
Summary
Calcium channel Ca(v)1.3 is crucial for auditory brainstem development. Its absence causes reduced brainstem volume and malformed structures, impacting neuronal function before hearing begins.
Area of Science:
- Neuroscience
- Developmental Biology
- Auditory System Research
Background:
- Voltage-gated calcium channels, specifically Ca(v)1.2 and Ca(v)1.3, are key in the adult brain.
- The developmental roles of Ca(v)1.3 channels in the brain, particularly the auditory system, remain largely unknown.
Purpose of the Study:
- To investigate the role of Ca(v)1.3 channel subunits in the activity-dependent development of the auditory brainstem.
- To understand the impact of Ca(v)1.3 deficiency on auditory centers during development.
Main Methods:
- Utilized Ca(v)1.3-deficient (Ca(v)1.3(-/-)) mice, which exhibit reduced cochlear-driven activity.
- Analyzed auditory brainstem volume, neuronal counts, and neuronal firing patterns in Ca(v)1.3(-/-) mice compared to controls.
- Employed Fura2 imaging to confirm functional Ca(v)1.3 channels in the lateral superior olive (LSO) of wild-type mice.
Main Results:
- Ca(v)1.3(-/-) mice showed significantly reduced volumes in all auditory brainstem centers (25-59%) before hearing onset.
- The lateral superior olive (LSO) was malformed with a 1/3 reduction in neurons.
- LSO neurons in mutant mice exhibited abnormal multiple action potential firing patterns, linked to reduced potassium conductances.
Conclusions:
- Ca(v)1.3 channels are essential for the proper development of the central auditory system.
- The observed LSO phenotype in Ca(v)1.3(-/-) mice results from both the loss of Ca(v)1.3 channels and the lack of peripheral input.
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