Unbiased RNA Amplification via Digestible Adapters
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Solution Overview
Problem
Current methods for amplifying RNA are limited in their ability to efficiently amplify small RNAs and introduce bias towards longer RNAs, making it difficult to study the roles of small RNAs in developmental processes and diseases, especially with limited sample quantities.
Innovation Solution
A method involving synthesizing oligonucleotides from RNA templates, using digestible adapters, and treating them with RNases or glycosylases, combined with specific salt and solvent conditions, to isolate and amplify RNA fragments as small as 15 nucleotides with minimal bias, allowing for the preparation of libraries suitable for high-throughput sequencing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional RNA amplification methods are used, then amplification of RNA is achieved, but there is bias towards longer RNAs and poor amplification of small RNAs
Solution Approach 1:
The patent modifies the amplification parameters by using template switching oligonucleotides with specific structures (including ribonucleotide overhangs and DNA polymerase interaction sequences) and controlling reaction conditions (temperature, enzyme concentrations) to achieve unbiased amplification of RNAs across a wide size range from 15 nucleotides to several kilobases
Solution Approach 2:
The patent introduces template switching oligonucleotides as intermediaries that facilitate the amplification process. These oligos act as mediators between the RNA template and the DNA polymerase, enabling efficient and unbiased amplification through controlled template switching events during reverse transcription
2Productivity
If conventional amplification methods are used, then RNA amplification is achieved, but the method requires large quantities of RNA template
Solution Approach 1:
The patent performs preliminary actions by adding template switching oligonucleotides and optimizing the reverse transcription conditions before the amplification step. This preliminary setup ensures that even low quantities of RNA template (as low as 10 pg) can be efficiently amplified with high productivity
Solution Approach 2:
The patent changes key parameters including the use of template switching oligonucleotides with specific sequences, control of reverse transcription temperature, and optimization of enzyme concentrations to achieve high amplification efficiency from minimal template quantities
3Quantity of substance
If conventional amplification methods are used, then amplification is achieved, but the method is biased against small RNAs
Solution Approach 1:
The patent changes the amplification parameters by using template switching oligonucleotides with specific structures that prevent size-based bias. The oligos contain ribonucleotide overhangs and DNA polymerase interaction sequences that ensure equal amplification efficiency for RNAs of all sizes, achieving accurate size distribution representation
Solution Approach 2:
The patent creates accurate copies of RNA molecules across all size ranges through controlled template switching during reverse transcription. The method produces faithful representations of the original RNA population, including small RNAs, without introducing size-based distortion in the amplified copies
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 effectively amplifies both small and long RNAs with negligible bias, enabling the analysis of low-quantity RNA samples and reducing the need for large RNA templates, improving the recovery and representation of small RNA fragments in downstream applications.
Implementation Method 1
subjecting the isolated product to treatment that digests at least a portion of the digestible adapter
Implementation Method 2
the glycosylase comprises uracil DNA glycosylase
Data Source
AI summary
This disclosure describes, in one aspect, a method of amplifying an RNA template. Generally, the method includes synthesizing an oligonucleotide from the RNA template, isolating at least a portion of the oligonucleotide, and subjecting the isolated product to treatment with an RNase and/or glycosylase.