Fusion Polypeptide RNA Editing for Target Identification
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Solution Overview
Problem
Current methods for identifying RNA-binding protein (RBP) targets in vivo are inefficient and unsuitable for cell-specific analysis due to requirements for high-affinity antibodies and large sample quantities, limiting their application to whole tissues rather than specific cells.
Innovation Solution
Development of fusion polypeptides combining RNA-binding proteins with RNA editing enzymes, such as adenosine deaminase or cytidine deaminase, to facilitate the identification of RNA targets by detecting novel editing events in cellular transcriptomes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CLIP method is used to identify RBP targets, then measurement precision is improved, but device complexity and sample quantity requirements increase
Solution Approach 1:
The patent introduces an RNA editing enzyme as an intermediary tool that creates detectable molecular marks (editing events) at RBP binding sites. This intermediary mechanism converts the difficult-to-detect RBP-RNA interaction into a easily detectable editing event, resolving the contradiction between measurement precision and experimental complexity by providing a simplified detection pathway that maintains high accuracy.
Solution Approach 2:
The patent replaces the mechanical/chemical crosslinking step with a biochemical editing reaction. Instead of using UV crosslinking to trap RBP-RNA complexes, the RNA editing enzyme catalyzes sequence changes at binding sites, substituting a complex physical crosslinking process with a more controlled and detectable enzymatic reaction, thereby reducing experimental complexity while maintaining identification accuracy.
2Measurement precision
If CLIP method is used to identify RBP targets, then measurement precision is improved, but quantity of substance required increases
Solution Approach 1:
The RNA editing enzyme serves as a molecular amplifier that creates multiple detectable editing events from a single RBP binding event. This intermediary mechanism increases the signal-to-noise ratio, allowing detection of RBP targets in smaller sample quantities while maintaining high measurement precision, directly resolving the contradiction between accuracy and sample quantity requirements.
3Ease of operation
If traditional immunoprecipitation is used, then ease of operation is maintained, but measurement precision deteriorates
Solution Approach 1:
The patent substitutes the traditional immunoprecipitation mechanical system with a biochemical editing system. Instead of relying on antibody-based precipitation that lacks cellular context, the RNA editing enzyme performs sequence-specific modifications in vivo, replacing a simple but inaccurate mechanical process with a more complex yet precise biochemical reaction that maintains cellular physiological conditions.
4Adaptability or versatility
If cell-specific RBP target identification is attempted using CLIP, then adaptability is improved, but quantity of substance available decreases
Solution Approach 1:
The RNA editing enzyme acts as a highly sensitive intermediary that can detect RBP binding events even in limited cell populations. By converting rare binding events into detectable editing events, the intermediary mechanism enables cell-specific target identification in small samples where traditional methods would fail due to insufficient material, thus resolving the contradiction between adaptability and sample quantity.
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 the identification of cell-specific RBP targets with improved efficiency and specificity, overcoming the limitations of existing methods by allowing analysis at the single-cell level and reducing the need for large sample quantities.
Implementation Method 1
fusion polypeptides comprising an RNA binding polypeptide operationally linked to an RNA modifying enzyme (e.g., adenosine deaminase, cytidine deaminase)
Data Source
AI summary
The present invention features fusion polypeptides comprising an RNA binding polypeptide operationally linked to an RNA modifying enzyme (e.g., adenosine deaminase, cytidine deaminase), and methods of use therefore.