Multi-Characteristics Opsins for Vision Restoration
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Solution Overview
Problem
Current methods for vision restoration in retinal degenerative diseases, such as dry age-related macular degeneration and Retinitis Pigmentosa, are limited by the need for high light intensities and inability to produce a characteristic photoreceptor-rod signal, making them ineffective at ambient light levels and invasive.
Innovation Solution
Development of Multi-Characteristics Opsins (MCOs) with enhanced light sensitivity and ion-selectivity, packaged in safe viral vectors for in-vivo delivery, which produce a slower depolarizing phase similar to photoreceptor-rod signals, enabling behavioral restoration of vision at low light intensities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional opsins are used for vision restoration, then light sensitivity is achieved, but high light intensities are required that are not present at ambient light levels
Solution Approach 1:
The patent combines multiple opsin characteristics into a single synthetic opsin molecule. The MCO incorporates spectral properties and kinetic features of different natural opsins (rhodopsin, cone opsins, channelrhodopsins) to create a composite protein that functions effectively at ambient light levels while maintaining photoreceptor-rod signal characteristics
Solution Approach 2:
The patent modifies key parameters of the opsin molecule including amino acid sequence, spectral sensitivity range, and kinetic properties. By changing these molecular parameters, the synthetic opsin achieves enhanced light sensitivity and produces the characteristic slower depolarizing phase of photoreceptor-rod signals, enabling function at ambient light intensities
2Reliability
If photoreceptor cell loss occurs in retinal degenerative diseases, then vision function is lost, but the retinal infrastructure and higher order neurons remain intact
Solution Approach 1:
The patent uses synthetic opsins as intermediary molecules that bridge the gap between remaining retinal neurons and light detection function. The opsin protein acts as a mediator that can be delivered via viral vectors to specific retinal cell types, restoring light sensitivity without requiring complex regeneration of entire photoreceptor cells
Solution Approach 2:
The patent replaces the mechanical/biological complexity of natural photoreceptor cells with a simpler molecular solution. Instead of regenerating entire photoreceptor cells with their complex structures and metabolic requirements, the invention uses smaller opsin proteins that can be genetically delivered and expressed in existing retinal neurons, substituting a simpler molecular system for a complex cellular one
3Reliability
If MCO plasmid size is reduced for safe viral packaging, then delivery safety is improved, but gene expression efficiency may be affected
Solution Approach 1:
The patent extracts and optimizes only the essential functional elements of the opsin gene for inclusion in the viral vector. By removing non-essential sequences and optimizing the coding region, the MCO gene fits within safe viral packaging limits while retaining full functional capability for light sensitivity and signal generation
Solution Approach 2:
The patent modifies the physical parameters of the genetic construct including plasmid size, gene sequence compactness, and viral vector configuration. These parameter changes enable packaging within safe viral capacity limits while maintaining or enhancing gene expression efficiency through optimized promoter regions and coding sequences
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Efficient and stable expression of MCOs in mouse retina models demonstrates behavioral restoration of vision even at light levels orders of magnitude lower than previous opsins, with negligible off-target effects and minimal tissue distribution, suggesting potential for effective gene therapy in humans.
Implementation Method 1
the light emitted from the stabilizer-biomarker present in the enhanced Multi-Characteristics Opsin (eMCO1) enhances the photo-induced current in the cells expressing eMCO1 by light emitted/re-emitted from the stabilizer-biomarker molecule
Implementation Method 2
expression of a specific MCO in cell produces a long-lasting inward current in response to white light similar to characteristic photoreceptor-rod signal
Data Source
AI summary
This invention, in one aspect, relates generally to compositions and methods for modulating cellular activities by synthetic opsins. Further, the invention provides method for the use of synthetic opsins for vision restoration and other applications, wherein the amino acid sequence of the synthetic opsin is modified to provide enhanced light sensitivity, kinetics and ion-selectivity.