Optogenetics: Illuminating the Future of Hearing Restoration and Understanding Auditory Perception


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Hearing loss is a prevalent sensory impairment significantly affecting communication and quality of life. Traditional approaches for hearing restoration, such as cochlear implants, have limitations in frequency resolution and spatial selectivity. Optogenetics, an emerging field utilizing light-sensitive proteins, offers a promising avenue for addressing these limitations and revolutionizing hearing rehabilitation. This review explores the methods of introducing Channelrhodopsin- 2 (ChR2), a key light-sensitive protein, into cochlear cells to enable optogenetic stimulation. Viral- mediated gene delivery is a widely employed technique in optogenetics. Selecting a suitable viral vector, such as adeno-associated viruses (AAV), is crucial in efficient gene delivery to cochlear cells. The ChR2 gene is inserted into the viral vector through molecular cloning techniques, and the resulting viral vector is introduced into cochlear cells via direct injection or round window membrane delivery. This allows for the expression of ChR2 and subsequent light sensitivity in targeted cells. Alternatively, direct cell transfection offers a non-viral approach for ChR2 delivery. The ChR2 gene is cloned into a plasmid vector, which is then combined with transfection agents like liposomes or nanoparticles. This mixture is applied to cochlear cells, facilitating the entry of the plasmid DNA into the target cells and enabling ChR2 expression. Optogenetic stimulation using ChR2 allows for precise and selective activation of specific neurons in response to light, potentially overcoming the limitations of current auditory prostheses. Moreover, optogenetics has broader implications in understanding the neural circuits involved in auditory processing and behavior. The combination of optogenetics and gene delivery techniques provides a promising avenue for improving hearing restoration strategies, offering the potential for enhanced frequency resolution, spatial selectivity, and improved auditory perception.

Sobre autores

Namit Singh

Department of Otorhinolaryngology and Head and Neck Surgery, All India Institute of Medical Sciences (AIIMS)

Autor responsável pela correspondência
Email: info@benthamscience.net

Balaji Ramamourthy

Department of Otorhinolaryngology and Head and Neck Surgery, All India Institute of Medical Sciences (AIIMS)

Email: info@benthamscience.net

Neemu Hage

Department of Otorhinolaryngology and Head and Neck Surgery, All India Institute of Medical Sciences (AIIMS)

Email: info@benthamscience.net

Krishna Kappagantu

Department of Otorhinolaryngology and Head and Neck Surgery, All India Institute of Medical Sciences (AIIMS)

Email: info@benthamscience.net

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