miRNA Detection Kit Using Adaptor Oligonucleotides for Multiplex Analysis
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Solution Overview
Problem
Current methods for detecting microRNA (miRNA) are cumbersome, prone to nonspecific amplification, require expensive real-time PCR systems, and are limited in multiplex analysis due to the short length and similarity of PCR products.
Innovation Solution
A kit and method utilizing a short reverse transcription primer with a specific hybridizing oligonucleotide and an adaptor oligonucleotide, followed by an extension primer for PCR amplification, allowing for efficient reverse transcription and PCR of miRNA, including poly(A)-tailed miRNA, to enhance detection specificity and multiplex capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional detection methods using stem-loop primers and two-step RT-PCR are used, then miRNA detection can be performed, but nonspecific amplification occurs and expensive real-time PCR systems are required
Solution Approach 1:
The detection system is divided into two independent stages: (1) reverse transcription using stem-loop primers to generate cDNA, and (2) PCR amplification using universal primers. This segmentation allows the use of simple, inexpensive PCR equipment for the amplification stage while maintaining the specificity benefits of stem-loop primers during reverse transcription, thereby reducing overall system cost and complexity without sacrificing detection reliability
Solution Approach 2:
A universal adaptor sequence is introduced as an intermediary element between the miRNA-specific stem-loop primer and the PCR amplification process. The adaptor sequence serves as a common binding site for universal primers, enabling specific miRNA detection through PCR without requiring miRNA-specific primers for each target. This intermediary approach eliminates the need for expensive real-time PCR systems while maintaining detection specificity
2Productivity
If conventional PCR-based methods are used for miRNA detection, then amplification can be achieved, but multiplex analysis is limited due to similar product sizes
Solution Approach 1:
The invention transitions from relying solely on product size differentiation (one dimension) to incorporating fluorescent label differentiation (another dimension). By attaching different fluorescent labels to reverse transcription primers for different miRNAs, multiple miRNAs can be simultaneously detected and distinguished by their unique fluorescent signatures, enabling robust multiplex analysis while maintaining detection accuracy
Solution Approach 2:
Different regions of the detection system are assigned different properties: the 5' end of reverse transcription primers contains miRNA-specific sequences for specific binding, while the 3' end contains universal adaptor sequences for common PCR amplification. This local differentiation allows multiple specificities to coexist within a unified amplification framework, enabling multiplex analysis
3Reliability
If poly(A) tailing is performed to enable reverse transcription, then detection sensitivity is improved, but reverse transcription time increases
Solution Approach 1:
The poly(A) tailing step is performed as a preliminary action before reverse transcription, ensuring that all miRNA molecules have a poly(A) tail ready for primer binding. This pre-preparation eliminates the need for time-consuming optimization of reverse transcription conditions during the main detection process, reducing overall reverse transcription time while maintaining detection sensitivity
Solution Approach 2:
The poly(A) tailing reaction is extracted and performed as a separate, optimized step before reverse transcription. By isolating this time-consuming step and performing it under optimized conditions with sufficient incubation time, the subsequent reverse transcription can proceed more efficiently, reducing the critical path time for the overall detection assay
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 approach enables quick, accurate detection of miRNAs with reduced reverse transcription time and improved multiplex analysis, facilitating the diagnosis of diseases like cancer and determining disease prognosis.
Implementation Method 1
the first hybridizing oligonucleotide having a nucleic acid sequence which hybridizes specifically to the 3′-end of a miRNA or the 3′-end of a poly(A)-tailed miRNA
Implementation Method 2
reverse-transcribing a miRNA using a reverse transcriptase and a short reverse transcription primer
Implementation Method 3
tailing a miRNA with poly(A) using a poly(A) polymerase
Implementation Method 4
extending the single-stranded cDNA using a DNA polymerase and an extension primer
Implementation Method 5
performing PCR amplification using as a template a double-strand cDNA produced by the extending
Data Source
AI summary
The present invention relates to a kit for detecting miRNA and a method for detecting miRNA using the kit. According to the miRNA detection kit and method of the present invention, it is possible to detect a certain miRNA in a quick and accurate manner, and it also possible to perform multiplex analysis capable of detecting a plurality of miRNAs at the same time.