Labeled Nucleotide Composition for RNA Quantification
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Solution Overview
Problem
Current methods for labeling RNA in polynucleotide arrays are susceptible to reverse-transcriptase reaction bias and are not quantitative, particularly when using streptavidin-dye or Ulysis Alexa Fluor systems, which are sensitive to sequence and G content variations in miRNAs.
Innovation Solution
Development of novel labeled nucleotide compositions with a phosphate group, a nucleoside moiety, a linking group, and an observable label moiety, specifically designed for RNA labeling, where the linking group is —(CH2)m—NH—C(O)—CH2—S—CH2)n—, allowing for efficient coupling with RNA using an RNA ligation enzyme under conditions with DMSO concentrations between 20% to 30%, enabling accurate array analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If streptavidin-dye or Ulysis Alexa Fluor systems are used for RNA labeling, then RNA can be labeled and detected, but the labeling is susceptible to reverse-transcriptase reaction bias and sequence/G content variations, making it non-quantitative
Solution Approach 1:
The patent changes the chemical parameters of the labeling system by using a novel nucleotide composition with a specific linking group structure (—(CH2)m—NH—C(O)—CH2—S—CH2)n—) that is incompatible with reverse-transcriptase recognition, thereby eliminating reaction bias while maintaining labeling efficiency and quantification accuracy
Solution Approach 2:
The patent introduces an RNA ligation enzyme as an intermediary to replace the reverse-transcriptase-based labeling system. This enzyme mediates the labeling reaction through a different mechanism that does not suffer from sequence or G content bias, enabling reliable quantification
2Ease of manufacture
If conventional labeling methods are used, then RNA labeling can be achieved, but the method is complex and susceptible to various biases
Solution Approach 1:
The patent extracts and eliminates the problematic reverse-transcriptase step from the labeling procedure, using a direct RNA ligation-based labeling method that simplifies the workflow while improving reliability by removing the source of reaction bias
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 solution provides a reliable and quantitative method for labeling RNA, enhancing the accuracy of array analysis by ensuring specific binding and observable patterns, thereby improving the detection and quantification of miRNAs in complex samples.
Implementation Method 1
contacting the sample with an enzyme having an RNA ligation activity in the presence of a labeled nucleotide composition under conditions sufficient to result in coupling of the labeled nucleotide composition to the RNA in the sample
Data Source
AI summary
Embodiments of labeled nucleotide compositions are described. Methods are described in which a sample containing RNA is contacted with an enzyme having an RNA ligation activity in the presence of a labeled nucleotide composition to provide labeled RNA. Methods of performing an array analysis of a labeled RNA sample are also described.