Nanopore Reporter Assays for Multiplexed Pathway Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multiplexed reporter gene assays can only assess a few signaling pathways at a time due to a limited range of reporter proteins, limiting the ability to accurately identify disease-associated pathways.
Innovation Solution
A method using nanopore sequencing technology to analyze multiple reporter constructs in living cells, employing a uniform population of reporter transcription units (RTUs) with distinct processing tags, enabling simultaneous assessment and real-time quality control of RTU activity profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional reporter gene assays use different reporter proteins for different pathways, then multiple pathways can be assessed simultaneously, but the range is limited to only a few pathways due to limited reporter protein options
Solution Approach 1:
The patent employs a universal reporter gene (luciferase) that serves multiple functions by combining it with different processing tags (PAMs). Instead of using different reporter proteins for different pathways, the same reporter gene can detect multiple pathways through its association with various PAMs, each recognized by specific restriction enzymes. This allows assessment of many signaling pathways simultaneously while maintaining a simple, unified reporter construct design.
Solution Approach 2:
The patent introduces processing tags (polyadenylation motifs or PAMs) as intermediary elements between the promoter and the reporter gene. These PAMs act as mediators that link pathway-specific promoter activity to the universal reporter gene expression. Each PAM is recognized by a specific restriction enzyme, enabling pathway discrimination without requiring different reporter proteins, thus resolving the contradiction between versatility and design complexity.
2Adaptability or versatility
If multiplexed reporter assays use a single reporter gene with processing tags, then many pathways can be assessed, but the detection method becomes complex requiring PCR, restriction enzyme digestion, and electrophoresis
Solution Approach 1:
The patent extracts and analyzes only the relevant portion of the reporter transcript - specifically the processing tag region - rather than analyzing the entire transcript or requiring complex separation of full-length reporter proteins. By using nanopore sequencing to directly read the PAM sequences from amplified cDNA, the method eliminates the need for restriction enzyme digestion and gel electrophoresis, simplifying the detection procedure while maintaining the ability to detect many pathways simultaneously.
Solution Approach 2:
The patent replaces the mechanical/chemical separation system (PCR amplification followed by restriction enzyme digestion and gel electrophoresis) with a direct sequencing system using nanopore technology. Instead of physically separating and visualizing DNA fragments through multiple steps, the nanopore sequencer directly reads the nucleotide sequence of the processing tags, dramatically simplifying the detection workflow while enabling simultaneous assessment of numerous pathways.
3Measurement precision
If traditional electrophoresis systems are used for separating DNA fragments, then accurate pathway detection is achieved, but expensive equipment and facilities are required
Solution Approach 1:
The patent adopts nanopore sequencing technology, which uses disposable flow cells containing nanopores instead of expensive, reusable electrophoresis equipment. The flow cells are single-use items that can be discarded after one experiment, eliminating the need for costly maintenance and facility requirements associated with traditional electrophoresis systems. This approach maintains measurement precision while dramatically reducing equipment costs and increasing accessibility.
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 high-content analysis of cellular signaling and transcriptomics, providing reliable and cost-effective multiplexed detection of multiple pathways with real-time quality assurance, replacing expensive equipment with portable nanopore devices.
Implementation Method 1
sequencing annealed reporter RNA or its amplified cDNA using a nanopore sequencing instrument
Data Source
AI summary
A method for parallel (multiplexed) assessment of multiple reporter constructs in living cells is described, in which a population of RTU constructs is introduced into assay cells, cellular RNA is isolated and annealed to a detection oligonucleotide that contains a sequence complementary to the RTU reporter sequence and an adapter sequence conducive for RNA sequencing by a nanopore sequencing device, optionally with amplification of reporter RNA transcripts before detection nucleotide annealing, sequencing annealed reporter RNA or its amplified cDNA using a nanopore sequencing instrument, analyzing the sequencing data to identify and tally processing tags of individual RTUs, and calculating and generating an RTU activity profile as the frequency of counted processing tags. Methods are also described for real-time controlling of quality of multiplexed reporter construct detection, and for assessment of multiple reporter constructs and gene expression in living cells.