eiCLIP Method for Accurate RBP-RNA Binding Site Identification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current CLIP-based methods for analyzing RNA-binding protein (RBP)-RNA interactions are inefficient, time-consuming, and prone to experimental artefacts, limiting their robustness and resolution, particularly in visualizing RBP-RNA complexes and producing high-quality cDNA libraries.
Innovation Solution
A streamlined, non-isotopic enhanced iCLIP (eiCLIP) protocol that reduces experimental artefacts and gel-based size selection, using novel nucleic acid adaptors to prevent non-specific binding, allowing for the production of high-quality cDNA libraries in as little as two days with reduced sample requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional CLIP-based methods are used to identify RBP-RNA interactions, then comprehensive analysis can be achieved, but the process is time-consuming and inefficient
Solution Approach 1:
The patent segments the traditional CLIP workflow into optimized modular steps: (1) UV crosslinking to capture RBP-RNA complexes, (2) RNase digestion to generate fragment libraries, (3) adapter ligation for sequencing preparation, and (4) high-throughput sequencing. This segmentation allows parallel processing and optimization of each step, reducing overall time while maintaining identification accuracy through systematic quality control at each stage.
Solution Approach 2:
The patent performs preliminary actions by pre-designing and pre-validating the adapter sequences, optimizing RNase digestion conditions beforehand, and preparing sequencing libraries in advance. These preliminary preparations eliminate time-consuming trial-and-error during actual experiments, enabling rapid data generation while preserving the precision of RBP-binding site identification through pre-optimized protocols.
2Reliability
If traditional CLIP protocols are used, then RBP-RNA complexes can be visualized, but experimental artefacts are introduced and robustness is reduced
Solution Approach 1:
The patent applies preliminary anti-action by implementing control experiments and validation steps before final analysis. This includes using multiple independent CLIP experiments, validating results against known RBP targets, and employing computational filters to distinguish true biological signals from experimental artefacts. These preliminary counter-measures enhance robustness while eliminating spurious findings.
Solution Approach 2:
The patent incorporates feedback mechanisms through iterative validation where sequencing results are fed back into the analysis pipeline for quality assessment. Computational algorithms compare observed RBP-binding sites against predicted binding motifs and known genomic features, providing feedback that identifies and corrects potential artefacts. This feedback loop ensures high reliability by continuously verifying results against multiple criteria.
3Manufacturing precision
If conventional adaptors are used in CLIP methods, then nucleic acid ligation can occur, but non-specific binding increases and quality is reduced
Solution Approach 1:
The patent applies local quality by designing adapters with region-specific functional elements: a 5' phosphorylated end for ligation specificity, a central sequencing adapter region for high-affinity binding, and a 3' overhang for size selection. Each region is optimized independently to perform its specific function with high precision, ensuring overall library quality while maintaining binding specificity through localized functional optimization.
Solution Approach 2:
The patent changes critical parameters of the adapter design, including the phosphate group at the 5' end to enable directional ligation, specific nucleotide sequences to prevent non-specific binding, and controlled adapter lengths to optimize library complexity. These parameter changes transform the adapter from a generic linking molecule into a precision tool that enhances cDNA library quality while maintaining simplicity in the overall protocol.
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
The eiCLIP method enables efficient and robust analysis of RBP-RNA interactions, providing accurate determination of RBP-binding sites and reducing the time required for data generation while minimizing experimental errors, thus improving the identification of new drug targets for diseases related to RBP-RNA interaction perturbations.
Implementation Method 1
all CLIP workflows initiate with ultra-violet (UV) irradiation of the sample to induce covalent crosslinks between RBPs and their interacting RNA targets
Implementation Method 2
the RNA is digested with RNase to generate a library of RNA fragments
Implementation Method 3
T4 RNA ligase is used to ligate a nucleic acid adaptor to the 5' phosphate of the RNA fragment
Implementation Method 4
reverse transcriptase stalling at the cross-linked nucleotide to identify the interaction site
Data Source
AI summary
The invention relates to methods for purifying and isolating at least one RNA molecule which interacts with an RNA-binding protein (RBP). The invention also provides nucleic acid adaptors and primers for use in such methods.