RNA Labeling via Adaptor Ligation and Segmented Probes
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Solution Overview
Problem
Current methods for analyzing total RNA samples struggle to effectively distinguish and quantify long and short RNA molecules due to their varying lengths and sequences, leading to challenges in accurate sample analysis.
Innovation Solution
A method involving RNA fragmentation to create a sample with fragments of long RNA molecules greater than 200 nucleotides and short RNA molecules, followed by adaptor ligation and hybridization to nucleic acid probes, allowing for the analysis of RNA abundance using sequencing or other methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If adaptor ligation is performed on fragmented RNA sample containing both long and short RNA molecules, then both types of RNA can be analyzed simultaneously, but the hybridization conditions become less specific due to the size variation
Solution Approach 1:
The probe is segmented into two distinct regions: a first region complementary to the adaptor sequence and a second region complementary to the RNA molecule. This segmentation allows the probe to simultaneously bind to both the adaptor (present on all RNA fragments) and the specific RNA target, enabling specific hybridization despite the size variation in RNA molecules. The segmented structure resolves the contradiction by maintaining specificity through the second region while accommodating all RNA sizes through the first region's binding to the universal adaptor.
2Productivity
If RNA sample is fragmented to include molecules of varying lengths, then comprehensive RNA analysis is enabled, but the ability to distinguish and quantify specific RNA types deteriorates
Solution Approach 1:
The adaptor serves as an intermediary element that is ligated to all fragmented RNA molecules regardless of their original size or type. This intermediary adaptor contains a universal binding site that the probe's first region recognizes, while the probe's second region provides specificity for the original RNA type. This intermediary approach enables comprehensive analysis of all fragmented RNA while maintaining the ability to distinguish specific RNA types through the dual-region probe design.
3Measurement precision
If hybridization conditions are optimized for short RNA molecules, then short RNA detection is improved, but long RNA fragment detection sensitivity decreases
Solution Approach 1:
The probe exhibits local quality differentiation through its two regions: the first region (binding to adaptor) provides universal binding capability for all RNA sizes, while the second region (binding to RNA-specific sequence) provides size-appropriate specificity. This local quality differentiation allows the same probe to effectively detect both short and long RNA fragments under the same hybridization conditions, resolving the contradiction between optimizing for short RNA detection while maintaining long RNA sensitivity.
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 approach enables precise estimation of long and short RNA abundances, improving the analysis of RNA samples by enhancing the specificity and stringency of hybridization conditions, thereby facilitating better diagnostic and research applications.
Implementation Method 1
hybridizing the adaptor-ligated sample to an array of nucleic acid probes
Data Source
AI summary
A method of sample analysis is provided. In certain embodiments, the method involves: a) obtaining a fragmented RNA sample comprising fragments of long RNA molecules and short RNA molecules; b) ligating an adaptor to an end of the RNA of the fragmented RNA sample to produce an adaptor-ligated sample; c) hybridizing said adaptor-ligated sample to an array of nucleic acid probes; and d) reading said array to obtain an estimate of the abundance of a long RNA in the RNA sample and an estimate of the abundance a small RNA in the RNA sample.