MAGIC Method for Multiplex Gene Expression in Living Cells
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Solution Overview
Problem
Current methods for monitoring gene expression in living cells, particularly in signal transduction cascades, face challenges in accurately tracking individual mRNA molecules in real-time and simultaneously visualizing multiple mRNA species, which hinders the understanding of temporal relationships between gene expression and functional effects.
Innovation Solution
The development of a Multiplex Analysis of Gene expression in Individual living Cells (MAGIC) method, where RNA binding probes labeled with FRET dyes specifically hybridize to target mRNAs, allowing a polypeptide with spectrally paired FRET dyes to bind, bringing the dyes into close proximity and enabling fluorescence resonance energy transfer (FRET) for real-time detection of multiple gene expressions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If microarray approaches are used to provide population information for millions of cells, then global gene expression data can be obtained, but accurate temporal information on transcriptional response is lost in the noise and stochastic variations
Solution Approach 1:
The invention segments the population of cells into individual single-cell units for analysis. By using microinjection to deliver mRNA molecules into individual cells and observing them separately, the method preserves temporal information that would be lost in bulk population measurements. Each cell's transcriptional response can be tracked independently over time, eliminating the averaging effect that masks temporal dynamics in microarray approaches.
2Difficulty of detecting and measuring
If fluorescent protein or luciferase assays are used for gene reporter assays, then translational readout of single genes can be measured, but the kinetics of gene expression cannot be directly inferred due to lag between transcription and translation
Solution Approach 1:
The invention introduces an intermediary approach by using mRNA molecules as the direct reporter instead of waiting for protein translation. The microinjected mRNA serves as a template that can be directly detected and quantified, providing a real-time readout of transcriptional activity without the time delay inherent in protein-based assays. This intermediary mRNA detection step bridges the gap between transcription and translation timing.
3Measurement precision
If FRET-based imaging assays are used to explore proteins in their natural habitat, then high spatial and temporal resolution can be achieved, but the ability to extend this to imaging dynamics of gene expression through observation of transcription has not been easily accomplished
Solution Approach 1:
The invention creates a universal platform that combines the advantages of FRET imaging with gene expression analysis. By microinjecting fluorescently labeled mRNA molecules that can serve as both the genetic material and the fluorescent reporter, the system achieves multi-functionality. The same FRET imaging apparatus used for protein dynamics can now also track transcriptional dynamics, extending the versatility of the technique while maintaining high spatial and temporal resolution.
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
Enables precise, real-time monitoring of multiple gene expressions in living cells, allowing for the simultaneous detection of up to 20 genes, providing accurate temporal and spatial information on gene expression dynamics and improving the understanding of signal transduction cascades.
Implementation Method 1
bringing the two FRET dyes into close proximity and allowing fluorescence resonance energy transfer (FRET) and a detectable change in fluorescence
Data Source
AI summary
The technology as disclosed herein relates to methods, compositions and kits for multiplex measuring levels of expression of target RNA species (e.g., mRNA and non-coding RNAs) in single, living cells. Aspects of the invention relate to, in part, a duplex-binding protein which is labeled with a FRET dye, and a RNA-binding probe, which comprises a spectrally paired FRET dye and specifically hybridizes to a target RNA. When the RNA-binding probe binds to a target RNA, a duplex is formed, which is allows binding of the duplex-binding protein bringing the two FRET dyes into close proximity and allowing fluorescence resonance energy transfer (FRET) reaction and a detectable change in fluorescence, which determines the amount of target RNA species in the living cell. Aspects of the invention also include, kits, vectors and polynucleic acid sequences of the duplex-binding protein and RNA-binding probes disclosed herein, and cell and cell lines comprising the same.