ISRE-VRE Reporter Construct for Sensitive IFN Detection
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Solution Overview
Problem
Current methods for detecting differential expression of IFN genes and IFN-stimulated genes lack sensitivity and specificity, requiring cumbersome steps and often fail to accurately quantify IFN bioactivity, making it difficult to distinguish between different types of IFNs and viruses.
Innovation Solution
The development of an expression active reporter construct with an interferon-stimulated response element (ISRE) or virus response element (VRE) combined with a minimal promoter and a reporter protein, such as EGFP, transfected into stable cell lines, allowing for sensitive and selective detection of IFN and viral induction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional antiviral assays or mRNA expression methods are used, then IFN bioactivity can be assessed, but the procedures are cumbersome, requiring multiple steps including cell lysis, RNA extraction, and amplification
Solution Approach 1:
The invention extracts and utilizes specific promoter sequences (ISRE and VRE) from viral and interferon-stimulated genes to drive reporter gene expression. By isolating these key regulatory elements and combining them with minimal promoters and reporter genes (luciferase, GFP, or beta-galactosidase), the assay directly measures IFN bioactivity through reporter signal without requiring cumbersome RNA extraction and amplification steps
Solution Approach 2:
The invention introduces reporter genes (luciferase, GFP, beta-galactosidase) as intermediary molecules that translate IFN-stimulated promoter activity into easily measurable signals. These reporter proteins serve as mediators between the biological response (promoter activation) and the detection system, enabling sensitive and specific quantification of IFN bioactivity through simple luminescence, fluorescence, or colorimetric readings
2Reliability
If standard IFN stimulated response elements are used in reporter assays, then IFN detection is possible, but sensitivity and selectivity are insufficient
Solution Approach 1:
The invention merges multiple functional elements into a single optimized reporter construct: viral response elements (VRE) or interferon-stimulated response elements (ISRE) are combined with minimal promoters and reporter genes. This integration creates a unified system where the promoter elements specifically respond to IFN stimulation while the reporter provides sensitive and selective detection, achieving both high reliability and measurement precision
Solution Approach 2:
The invention optimizes the reporter construct by carefully selecting and combining specific promoter sequences (ISRE from ISG54, VRE from viral genes) with appropriate reporter genes. By changing the parameters of the reporter system—using different reporter genes (luciferase, GFP, beta-galactosidase) and optimizing promoter-reporter linkages—the assay achieves enhanced sensitivity and selectivity for detecting IFN bioactivity
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 provides a simple, versatile, and sensitive method for detecting and differentiating IFN and viral inductions, enabling accurate quantification of IFN potency and activity, and distinguishing between various viruses, with improved sensitivity and specificity compared to traditional assays.
Implementation Method 1
reporter protein, such as EGFP
Data Source
AI summary
The present disclosure refers to a method for a specific, versatile and sensitive detection of IFN-/virus-induced genes, a method for quantifying IFN potency and activity in a pharmaceutical preparation or biological sample, a method for distinguishing between IFN- and viral induction, and/or for distinguishing between different viruses, and a method for the quantification of virus activity. Also, the invention provides the necessary molecular tools like expression active response constructs, suitable cell lines, an array to perform the method and a kit.