Light-Controlled Viral Transduction via PhyB Adapter
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Solution Overview
Problem
Current single-cell genetic engineering techniques like microinjection, electroporation, and optical transfection are invasive, have low throughput, and require complex instrumentation, making them unsuitable for widespread use, especially for primary cells and tissues where off-target effects are a concern.
Innovation Solution
The development of an optically guided system using adeno-associated viral (AAV) vectors and light-responsive adapter proteins, such as PhyB, which allows for the selective transfer of genetic information into single cells without prior genetic modification, using low-dose, non-invasive light stimulation, minimizing impact on surrounding cells and enabling spatio-temporal control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microinjection, single-cell electroporation or optical transfection based on laser-induced cell membrane perforation is used, then single-cell genetic engineering can be achieved, but the method is invasive, has low throughput and requires complicated instrumentation
Solution Approach 1:
The patent introduces a light-responsive adapter protein (e.g., PhyB) as an intermediary that mediates between light and the viral vector. When illuminated with red light, PhyB undergoes a conformational change that enables it to bind to the AAV vector, facilitating selective transduction of illuminated cells without requiring complex instrumentation or invasive procedures
Solution Approach 2:
The patent replaces mechanical and electrical methods (microinjection, electroporation, laser-induced membrane perforation) with an optical-biological system. Instead of physically or electrically forcing genetic material into cells, the system uses light-induced conformational changes in adapter proteins to enable selective viral transduction, thereby eliminating the need for complicated mechanical instrumentation
2Ease of operation
If optogenetics is used to optically control processes in single cells, then light-responsive control is achieved, but previous transfer of genetic information is required which prevents use of primary cells and may affect surrounding off-target cells
Solution Approach 1:
The patent applies preliminary action by pre-modifying the viral vector (AAV) to display the light-responsive adapter protein (PhyB) on its surface, rather than requiring preliminary genetic modification of the target cells. This allows the vector itself to become light-responsive, enabling selective transduction of illuminated cells while leaving primary and non-illuminated cells unaffected
Solution Approach 2:
The patent implements local quality by confining the light-responsive property to specific regions (illuminated cells) through spatially restricted light delivery. Only cells exposed to the activating wavelength range undergo the conformational change necessary for vector binding and transduction, thereby eliminating off-target effects on surrounding cells
3Productivity
If high doses of light are used to initiate single-cell engineering, then engineering can be initiated, but cell damage and off-target effects occur
Solution Approach 1:
The patent utilizes parameter changes by exploiting the wavelength-dependent conformational transition of the light-responsive adapter protein. By using a specific activating wavelength range (e.g., red light around 660 nm) that induces the active conformation without causing cellular damage, the system achieves high transduction efficiency while maintaining cell viability. The deactivation wavelength range (e.g., far-red light around 740 nm) reverses the conformation without damage
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
This approach enables efficient, accurate, and reversible genetic engineering of single cells with high transduction efficiency, stability, and minimal off-target effects, suitable for both genetically modified and unmodified cells, and can be applied in regenerative medicine and gene therapy.
Implementation Method 1
The present invention (i) does not require the previous genetic engineering of target cells, (ii) relies on standard hardware for optical stimulation (e.g. light-emitting diodes or a conventional confocal microscope), (iii) is compatible with immortalized and primary cells, and (iv) relies on non-invasive light
Data Source
AI summary
The present invention is directed to a kit of parts having biological activity, the kit of parts comprising a first target comprising a first protein and a second target comprising a second protein, wherein the first protein and the second protein are suitable to form a heterodimer upon irradiation with UV, visible or infrared light in a first wavelength range or in the dark, which can be reversed upon irradiating the heterodimer with UV, visible or infrared light in a second wavelength range or in the dark, wherein the second wavelength range is different from the first wavelength range, wherein the biological activity consists of triggering both the uptake of DNA, RNA, proteins, or small molecules into a cell which is preferably genetically unmodified, and biological effects, and characterized in that at least one of the first and the second target itself has reduced biological activity as compared with the heterodimer.