RNA 2'-O-methylation Detection via Rnase R Degradation Termination
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Solution Overview
Problem
Current methods for detecting 2'-O-methylation modifications in RNA molecules, particularly at the 3' terminal nucleotide, suffer from low sensitivity and require large sample amounts.
Innovation Solution
A method involving the use of ribonuclease Rnase R, which degrades RNA molecules without 2'-O-methylation modifications, allowing for the identification of 2'-O-methylation sites through degradation termination sites and subsequent high-throughput sequencing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods (periodate oxidation, reverse transcription, etc.) are used to detect 2'-O-methylation modifications, then detection capability is achieved, but sensitivity is low and large sample amounts are required
Solution Approach 1:
The invention changes the detection parameter from chemical modification (periodate oxidation) or enzymatic sensitivity (reverse transcription inhibition) to direct enzymatic degradation specificity. Rnase R's ability to selectively degrade only non-methylated RNA at the 3' end provides a binary, high-contrast detection signal that dramatically improves sensitivity and reduces sample requirements.
Solution Approach 2:
The invention extracts and utilizes the specific degradation termination property of Rnase R at methylated sites. By isolating this enzymatic behavior and using it as the core detection mechanism, the method achieves high sensitivity without requiring complex chemical or enzymatic reaction systems, thereby reducing sample amount requirements.
2Measurement precision
If multiple complex operations (oxidation, elimination, purification) are performed to detect methylation, then detection is achieved, but operation complexity increases
Solution Approach 1:
The invention extracts the core detection function to a single enzymatic step using Rnase R. Instead of performing multiple sequential operations (oxidation, elimination, purification), the method relies on Rnase R's inherent ability to terminate degradation at methylated sites, which can be detected through simple sequencing or electrophoresis, greatly simplifying the workflow.
Solution Approach 2:
Rnase R performs the detection function autonomously through its natural substrate specificity. The enzyme self-selects methylated versus non-methylated RNA molecules and produces distinguishable degradation products without requiring external chemical modifications or complex purification steps, making the operation simple and efficient.
3Adaptability or versatility
If conventional detection methods are used, then detection capability is achieved, but the methods lack universal applicability to different RNA types
Solution Approach 1:
Rnase R exhibits universal substrate recognition for single-stranded RNA molecules with 3' overhangs, regardless of the specific RNA type (miRNA, siRNA, piRNA, etc.). This universal enzymatic activity allows the same detection method to be applied across different RNA classes while maintaining reliable differentiation of methylation status through degradation termination patterns.
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 method provides high sensitivity and universal applicability, with mild reaction conditions and simple operation, enabling accurate detection of 2'-O-methylation modifications in RNA molecules.
Implementation Method 1
contacting the RNA molecule with a ribonuclease Rnase R... wherein, if the RNA molecule is degraded, this indicates that the RNA molecule does not have the 2'-O-methylation modification
Data Source
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AI summary
Provided is a method for identifying whether an RNA molecule has a 2'-O-methylation modification on a nucleotide, said method comprising: (1) contacting the RNA molecule with a ribonuclease Rnase R; and (2) detecting whether the RNA molecule is degraded or detecting hydrolysis termination positions after degradation. If the RNA molecule is degraded, this indicates that the RNA molecule does not have a 2'-O-methylation modification on a 3' terminal nucleotide, and if hydrolysis terminates at a same site on multiple random broken fragments, this indicates that the RNA molecule has a 2'-O-methylation modification on the nucleotide at the position immediately preceding the termination site. Also provided are applications of the method for screening for a disease diagnosis target and confirming whether a subject has a 2'-O-methylation modification-related disease.