Intracellular Sensor Systems for Precise Cell Targeting
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Solution Overview
Problem
Current genetic tools are limited in their ability to specifically target and manipulate intracellular cell types beyond cell surface proteins, necessitating the development of new genetic tools for precise biological studies and therapeutic applications.
Innovation Solution
A synthetic biological switch comprising a fusion protein with an intracellular target ligand-binding recognition domain linked to an effector domain, where the effector domain's activity is stabilized or destabilized based on the presence or absence of an intracellular target ligand, enabling spatial control of effector activity within cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cell surface proteins are used for targeting, then cell-specific manipulation is achieved, but intracellular cell types cannot be targeted
Solution Approach 1:
The patent uses a binary expression system where a driver molecule (e.g., Cre recombinase) expressed under a cell-type specific promoter acts as an intermediary to activate a responder element (e.g., fluorescent protein or effector gene) under UAS control. This intermediary mechanism enables indirect targeting of intracellular cell types through molecular cascades rather than direct surface protein binding.
Solution Approach 2:
The targeting system is segmented into separate functional components: a driver molecule for cell-type specific expression and a responder element for effector function. This segmentation allows independent optimization of targeting specificity (driver) and effector activity (responder), enabling precise intracellular targeting without relying on cell surface proteins.
2Ease of manufacture
If transgenesis and transient gene delivery are used, then genetic manipulation is established, but cell specificity is unclear
Solution Approach 1:
The patent implements local quality by placing the driver molecule expression under a cell-type specific promoter, ensuring that genetic manipulation occurs only in the desired cell population. The responder element is then activated locally through the driver-responder interaction, achieving both high manipulation efficiency and precise cell specificity simultaneously.
3Adaptability or versatility
If cell surface receptors are used for delivery, then cell targeting is achieved, but only cells with specific surface receptors can be targeted
Solution Approach 1:
The patent replaces the mechanical system of cell surface receptor binding with a molecular cascade system based on promoter-driven transcriptional activation. This substitution allows targeting based on intracellular molecular profiles rather than surface protein presence, expanding the adaptable cell types while maintaining high targeting accuracy through specific promoter-responder interactions.
Data Source
AI summary
Disclosed herein are sensor systems, compositions comprising the sensor systems, and methods of using the same. In particular aspects, disclosed herein are sensor systems for a target intracellular ligand and uses thereof, e.g., in detection assays or in cell manipulation or therapeutic applications.