mTAIL-seq mRNA 3' End Sequencing Sensitivity
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Solution Overview
Problem
Current methods for analyzing 3′ end sequences of mRNA are inefficient for small sample sizes, such as oocytes and early embryos, due to experimental limitations, and fail to provide global gene-level analysis of poly(A) tail length and its impact on protein synthesis.
Innovation Solution
The development of a method called mTAIL-seq, which involves ligating a 3′ hairpin adaptor to the 3′ end of mRNA, followed by partial digestion, 5′ end phosphorylation, and ligation of a 5′ adaptor, reverse transcription, and sequencing, allowing for accurate measurement of poly(A) tail lengths and analysis of 3′ end sequences from limited samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used for analyzing 3' end sequences of mRNA, then the analysis can be performed with sufficient sample quantity, but the sensitivity is insufficient for small sample sizes such as oocytes and early embryos
Solution Approach 1:
The method segments the mRNA analysis process into distinct steps: 3' end adaptor ligation, partial digestion to generate fragments of different sizes, size selection, and sequencing. This segmentation allows enrichment of 3' end sequences even from limited starting material by focusing sequencing capacity on the relevant fragment population.
Solution Approach 2:
The method performs preliminary 3' end adaptor ligation and partial digestion before sequencing to pre-enrich the 3' end sequences. This preliminary action ensures that even small amounts of starting material yield sufficient enriched 3' end sequences for accurate poly(A) tail length measurement.
2Adaptability or versatility
If conventional methods are used for analyzing 3' end sequences of mRNA, then the experimental procedure is simpler, but the analysis cannot be performed at global gene level due to experimental limitations
Solution Approach 1:
The mTAIL-seq method uses universal adaptors that can ligate to the 3' ends of any mRNA molecule regardless of gene identity. This universal approach enables simultaneous analysis of poly(A) tail lengths across thousands of genes, achieving global gene level analysis that conventional gene-specific methods cannot provide.
Solution Approach 2:
The method changes the experimental parameter from gene-specific analysis to genome-wide analysis by using size selection and high-throughput sequencing. This parameter change allows the same basic protocol to analyze poly(A) tail lengths for all detectable mRNAs in the sample, enabling global gene level analysis.
3Measurement precision
If mTAIL-seq method is used to analyze 3' end sequences of mRNA from small samples, then sensitivity is significantly improved, but the experimental procedure becomes more complex
Solution Approach 1:
The protocol segments the analysis into discrete, optimized steps including 3' end adaptor ligation, controlled partial digestion, size selection, and sequencing. Each segment is designed to maximize efficiency and minimize sample loss, achieving high sensitivity from small inputs despite the multi-step nature of the procedure.
Solution Approach 2:
The method introduces a 3' hairpin adaptor as an intermediary molecule that ligates to the 3' end of mRNA. This adaptor serves as a universal handle for subsequent enrichment and sequencing steps, enabling sensitive detection of 3' end sequences even when starting with very limited mRNA material.
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
mTAIL-seq significantly improves sensitivity, enabling the analysis of thousands of mRNAs and revealing correlations between poly(A) tail length and translational efficiency, particularly in immature oocytes, mature oocytes, and early embryos, providing insights into protein production regulation.
Implementation Method 1
a poly(A) tail binding region linked to the 3' arm of the first stem region in an overhang manner
Implementation Method 2
include at least one biotinylated nucleotide at a 5' end of the 3' arm, hybridized with a 3' end of the 5' arm, in the stem region
Implementation Method 3
a second loop region including an endonuclease recognition site
Data Source
AI summary
The present disclosure provides a new protocol for sequencing the 3′ end of messenger RNA (mRNA). The present disclosure can be very favorably used in analyzing the repetitive sequences of nucleic acids, which are difficult to analyze by current sequencing methods, especially, homopolymeric sequences (poly[A] sequence) of mRNA. The present disclosure has significantly improved sensitivity to mRNA compared with an existing method, thereby obtaining a lot of genetic information from a small amount of sample. The method of the present disclosure reduces the time and cost for sequencing the 3′ end of mRNA and can be applied to various samples, and thus, can be used as a useful tool in the study of RNA synthesis/degradation and protein production in association with all life phenomena, including embryogenesis, cancer, and neurotransmission.