Telomere Amplification via Adaptor Ligation and Circularization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for determining telomere length in genomic DNA are not efficient or sensitive enough, leading to incomplete telomere analysis and potential issues in understanding aging and cancer-related diseases.
Innovation Solution
A method involving the preparation of telomere fragments through nuclease treatment, ligation with single-stranded adaptors, exonuclease treatment to create blunt ends, self-ligation to form circular products, and subsequent amplification using specific primers and polymerases to enhance telomere amplification and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods (TRF, q-PCR, STELA) are used for telomere length determination, then basic telomere analysis can be performed, but amplification efficiency is insufficient and sensitivity is low
Solution Approach 1:
The method segments the genomic DNA by using restriction enzymes to cut at specific sites, isolating telomere-containing fragments from the rest of the genome. This segmentation allows focused amplification of telomere regions, improving both amplification efficiency and detection sensitivity by eliminating interference from non-telomere DNA.
Solution Approach 2:
The patent introduces adaptor nucleic acids as intermediaries that bridge the telomere fragments and the amplification system. These adaptors contain specific sequences that enable selective amplification and detection, acting as mediators that enhance the connection between the target telomere and the detection machinery, thereby improving sensitivity and efficiency.
2Quantity of substance
If conventional amplification methods are used, then general genomic DNA can be amplified, but non-telomere genomic DNA is also amplified reducing specificity
Solution Approach 1:
The method applies local quality by designing primers and adaptors with sequences specific to telomere regions. This localized specificity ensures that amplification resources are concentrated on telomere fragments rather than being distributed across the entire genome, increasing telomere fragment amplification while minimizing non-telomere DNA amplification.
Solution Approach 2:
The patent performs preliminary action by pre-treating the genomic DNA with restriction enzymes to generate telomere-containing fragments before amplification. This preliminary processing step enriches the template for telomere-specific amplification, ensuring that subsequent PCR reactions primarily amplify telomere sequences rather than random genomic DNA.
3Measurement precision
If additional processing steps like Southern blotting are used for precise measurement, then measurement accuracy improves, but process complexity and time increase
Solution Approach 1:
The patent replaces the mechanical and labor-intensive Southern blotting process with a molecular biology-based amplification and detection system. By using PCR amplification followed by modern detection methods (such as capillary electrophoresis or real-time PCR), the method achieves comparable or superior measurement precision while eliminating complex transfer and hybridization steps.
Solution Approach 2:
The method changes the measurement parameters by amplifying telomere fragments to detectable quantities before measurement. This parameter change (from trace amounts to amplified quantities) enables precise length determination using simpler, faster detection technologies rather than requiring the complex Southern blotting procedure.
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 improves amplification efficiency, reduces non-telomere genomic DNA amplification, allows for high-sensitivity detection of telomere fragments, and enables precise measurement of single telomere lengths without additional processing steps like Southern blotting.
Implementation Method 1
preparing a telomere fragment by incubating a sample including genomic DNA including a telomere with at least one nuclease
Implementation Method 2
preparing a telomere fragment-adaptor n ligated product by incubating the telomere fragment with a single stranded adaptor nucleic acid and a ligase
Implementation Method 3
preparing a blunt-end telomere fragment-adaptor ligated product by incubating the telomere fragment-adaptor ligated product with an exonuclease
Implementation Method 4
preparing a blunt-end telomere fragment-adaptor ligated product by incubating the telomere fragment-adaptor ligated product with a first nucleic acid polymerase
Implementation Method 5
preparing a circular telomere fragment-adaptor ligated product by incubating the blunt-end telomere fragment-adaptor ligated product in the presence of a ligase
Implementation Method 6
amplifying the telomere fragment by incubating the circular telomere fragment-adaptor ligated product in the presence of a primer and a second nucleic acid polymerase
Data Source
AI summary
A method of amplifying a telomere of genomic DNA using an adaptor sequence, and a composition and a kit for amplifying the telomere of genomic DNA.