Extensible Recombinase Cascades for Spatiotemporal Gene Control
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Solution Overview
Problem
Conventional genetic tools are limited in complexity due to the restricted number of inducible systems and inducer molecules, providing a limited perspective on gene regulation and lacking appreciation for spatiotemporal dynamics, which hinders the understanding of gene regulation and its biological functions.
Innovation Solution
The development of genetic constructs comprising multiple genetic perturbation cassettes with inducible recombinases, each activated by specific inducers, allowing for sequential and multiplexed control of gene expression through recombinase recognition sites, enabling scalable and controllable perturbation of multiple genes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional genetic tools with limited inducible systems are used, then the system is simple to operate, but the complexity of genetic programs is restricted
Solution Approach 1:
The genetic construct is divided into multiple independent perturbation cassettes, each containing a gene of interest flanked by specific recombinase recognition sites. This segmentation allows each cassette to be independently controlled by specific inducible recombinase systems, enabling complex genetic programs while maintaining manageable system organization through modular design
Solution Approach 2:
The invention employs multiple inducible recombinase systems (Cre, Flp, Bxb1, PhiC31, R4) that can be combined in various configurations. Each recombinase system is multi-functional, capable of recognizing specific sites and catalyzing recombination events. This universality allows a single genetic construct to implement complex sequential and combinatorial genetic programs using a limited set of core components
2Adaptability or versatility
If multiple inducible recombinase systems are combined, then spatiotemporal regulation of gene expression is enabled, but the device complexity increases
Solution Approach 1:
Different recombinase recognition sites (loxP, FRT, attB, attP, Xba) are locally assigned to different perturbation cassettes within the genetic construct. Each cassette has unique local quality in terms of its recognition sites, allowing specific spatial control over which genes are perturbed and when, enabling precise spatiotemporal regulation without requiring the entire construct to be uniformly complex
Solution Approach 2:
The genetic construct is designed with a nested structure where multiple perturbation cassettes are arranged sequentially, with each cassette containing genes of interest flanked by recombinase sites. The cassettes are nested within a single plasmid or genomic locus, allowing hierarchical control where the activation of one cassette can influence the expression of subsequent cassettes, enabling complex temporal dynamics through nested organization
3Loss of information
If sequential genetic perturbations are implemented, then the understanding of gene regulation dynamics is improved, but the number of required inducers increases
Solution Approach 1:
Multiple inducible recombinase systems are merged into a single genetic construct, allowing sequential genetic perturbations to be controlled by a limited set of inducer molecules. The systems are combined in such a way that a small number of inducers can trigger cascading recombination events that sequentially activate multiple perturbation cassettes, reducing the total number of inducers needed while maintaining the ability to study spatiotemporal dynamics
4Adaptability or versatility
If extensible recombinase cascades are used, then the scalability of genetic programs is enhanced, but the manufacturing complexity of genetic constructs increases
Solution Approach 1:
The genetic construct is pre-designed with all necessary recombinase recognition sites and perturbation cassettes in place before experimental use. The modular cassette architecture allows researchers to pre-assemble standard building blocks with defined recognition sites, eliminating the need for complex custom engineering during experimentation. This preliminary preparation enables scalable genetic programs to be implemented by simply adding or removing pre-characterized cassettes rather than redesigning the entire construct
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 a wide range of sequential and combinatorial gene programs, allowing for the spatiotemporal regulation of gene expression, facilitating the evaluation of gene expression in developmental processes and disease models like cancer and neurodegenerative diseases.
Implementation Method 1
a first nucleic acid encoding a first inducible recombinase the recombinase activity of which is induced by a first inducer... wherein the first recombinase is capable of binding to and cleaving the first nucleic acid at each recombinase recognition site
Data Source
AI summary
Provided herein are genetic constructs comprising genetic perturbation cassettes and methods of using such to assess the timing and order of gene expression.