Multi-Characteristics Opsins for Low-Light Vision Restoration
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Solution Overview
Problem
Retinal degenerative diseases such as dry age-related macular degeneration and Retinitis Pigmentosa result in the degeneration of photoreceptor cells, leading to reduced light sensitivity and blindness due to the loss of photoreceptor function.
Innovation Solution
Development of synthetic, light-sensitive ion-channel and ligand molecules, known as Multi-Characteristics Opsins (MCOs), which are packaged into genomic vectors like adeno-associated viruses, enabling efficient expression in retinal cells to restore light sensitivity and vision, even at low light intensities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If photoreceptor cells are used for light detection, then light sensitivity is achieved, but photoreceptor degeneration leads to loss of function and blindness
Solution Approach 1:
The patent introduces synthetic opsins as intermediary molecules that can be delivered to and expressed in non-photoreceptor retinal cells (such as bipolar cells or ganglion cells). These opsins act as mediators to restore light sensitivity in cells that would otherwise be insensitive to light, thereby bypassing the need for functional photoreceptors.
Solution Approach 2:
The patent replaces the natural photoreceptor mechanism (which is mechanically/degeneratively failing) with a synthetic optogenetic system. Instead of relying on the natural phototransduction cascade in photoreceptors, the invention uses genetically engineered opsins expressed in other retinal neurons to detect light and generate electrical signals.
2Reliability
If conventional opsins are used for vision restoration, then light sensitivity is partially restored, but the light intensity required is orders of magnitude higher than ambient light levels
Solution Approach 1:
The patent employs hyperpolarizing opsins that fundamentally change the operational parameters of optogenetic vision restoration. By using opsins that hyperpolarize the membrane potential rather than depolarize it, the system can detect and respond to very low light intensities, including ambient light levels, thereby eliminating the need for high-intensity illumination.
3Reliability
If retinal cells are targeted for opsin delivery, then vision restoration is achieved, but the inner limiting membrane barrier prevents efficient delivery in humans
Solution Approach 1:
The patent introduces enzymes (such as hyaluronidase or pronase E) as intermediary agents that temporarily degrade or modify the inner limiting membrane barrier. These enzymatic mediators create transient pathways that allow opsin-carrying viral vectors to efficiently penetrate and deliver genetic material to retinal cells, overcoming the physical barrier that would otherwise prevent effective delivery.
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
MCOs enhance light sensitivity and induce a slow depolarizing phase similar to photoreceptor-rod signals, effectively restoring vision and improving visually guided behavior in individuals with retinal degeneration.
Implementation Method 1
photoreceptors (e.g., rods and cones) that are responsible for conversion of light into electro-chemical signals
Implementation Method 2
have high photosensitivity at multiple visible wavelengths
Implementation Method 3
light emitted/re-emitted from the stabilizer-biomarker molecule enhances the photo-induced current
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.