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Prestin and high frequency hearing in mammals
Stephen J Rossiter1, Shuyi Zhang, Yang Liu
1School of Biological and Chemical Sciences; Queen Mary University of London; London, UK.
Communicative & Integrative Biology
|June 10, 2011
Summary
The cochlear gene prestin shows parallel evolution in bats and cetaceans, with specific amino acid changes enhancing ultrasonic hearing. This study investigates if similar adaptations exist in other mammals with high-frequency hearing.
Area of Science:
- Evolutionary biology
- Auditory neuroscience
- Molecular genetics
Background:
- The gene prestin is crucial for cochlear amplification and hearing sensitivity.
- Echolocating bats and cetaceans have evolved ultrasonic hearing.
- Parallel adaptive amino acid replacements in prestin are linked to ultrasonic hearing in bats and cetaceans.
Purpose of the Study:
- To review evidence of parallel evolution in the prestin gene related to ultrasonic hearing.
- To investigate if similar prestin evolution signatures are present in mammals with high-frequency passive hearing.
- To compare prestin gene evolution in mammals with and without high-frequency hearing capabilities.
Main Methods:
- Comparative analysis of prestin gene sequences across diverse mammalian species.
- Review of existing literature on auditory adaptations and molecular evolution.
- Correlation of specific amino acid residues with auditory frequency ranges.
Main Results:
- Significant parallel amino acid changes in prestin are observed in echolocating bats and cetaceans, correlating with high-frequency hearing.
- Preliminary findings suggest similar evolutionary signatures in mammals utilizing high-frequency passive hearing.
- Mammals lacking high-frequency hearing show less evidence of these specific prestin adaptations.
Conclusions:
- Specific amino acid residues in prestin likely enhance auditory sensitivity to high frequencies.
- Prestin evolution provides insights into the adaptive mechanisms of hearing across different mammalian groups.
- The study highlights convergent evolution in auditory gene prestin driven by similar selective pressures.
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