Epigenetic Modification Analysis via DNA Combing and Barcoding
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Solution Overview
Problem
Current DNA sequencing technologies are limited in their ability to accurately identify and phase epigenetic modifications across the genome, particularly for modifications other than 5-methylcytosine, due to limitations in resolution and throughput, which hinders comprehensive epigenome sequencing and understanding of complex diseases.
Innovation Solution
A method involving DNA stretching on a surface, labeling with affinity agents, capturing with positional barcodes, and preparing sequencing libraries to enable precise localization and sequencing of epigenetic modifications, allowing for the assembly of short reads and phasing of epigenetic marks across long DNA molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current DNA sequencing technologies are used, then sequencing can be performed, but the ability to accurately identify and phase epigenetic modifications is limited due to insufficient resolution and throughput
Solution Approach 1:
The method segments the epigenome analysis into distinct functional modules: DNA stretching/combing on surfaces for high-resolution mapping, affinity labeling for specific modification detection, barcode assignment for positional information, and library preparation for sequencing. This segmentation allows each module to be optimized independently, achieving both high measurement precision for epigenetic modifications and high throughput via parallel processing of multiple DNA molecules
Solution Approach 2:
The patent introduces several intermediary elements to bridge the gap between standard sequencing and epigenetic analysis: affinity agents (antibodies, proteins) serve as intermediaries to specifically bind and mark epigenetic modifications; spatial barcodes act as intermediaries to capture positional information; and surface stretching/combing structures serve as intermediaries to organize DNA for high-resolution analysis. These intermediaries enable simultaneous detection of multiple epigenetic marks with high precision and throughput
2Measurement precision
If standard sequencing methods are used, then sequencing can be performed, but the resolution for detecting epigenetic modifications is insufficient
Solution Approach 1:
The method performs preliminary actions before sequencing to enhance resolution: DNA is stretched and combed on surfaces prior to sequencing to organize molecules and enable high-resolution mapping of epigenetic modifications; affinity labels are pre-attached to specific modifications; and spatial barcodes are assigned to capture positional information. These preliminary steps, while adding some complexity, enable unprecedented resolution by preparing DNA in an optimized state that preserves and highlights epigenetic features
Solution Approach 2:
The patent creates a universal platform that combines multiple functions into an integrated system: the surface stretching/combing apparatus serves both for DNA organization and high-resolution mapping; affinity agents provide both specific binding and detectable labeling; barcodes provide both positional information and sequencing compatibility. This multi-functionality reduces the need for separate specialized devices, managing complexity while achieving high resolution
3Measurement precision
If high-resolution epigenetic analysis is performed, then accuracy improves, but the throughput and completeness of analysis decreases
Solution Approach 1:
The method changes key parameters to enable both high accuracy and high throughput: DNA is stretched to extreme lengths (megabase scales) to preserve long-range epigenetic information; surface densities are optimized to achieve high coverage (30X diploid genome coverage) while maintaining molecular resolution; affinity labeling uses highly specific antibodies and proteins for accurate modification detection; and barcoding systems provide precise positional information. These parameter changes enable parallel processing of numerous DNA molecules with maintained high resolution, achieving both accuracy and throughput
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 enhances the accuracy, precision, and completeness of epigenetic analysis, enabling the detection of multiple epigenetic modifications with high resolution and throughput, transforming the understanding of the epigenome and its role in diseases.
Implementation Method 1
labeling the epigenetic modification with an affinity agent that binds to the modification
Implementation Method 2
the capturing comprises binding the antibody with a streptavidin
Data Source
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AI summary
Provided herein are methods and compositions for analyzing epigenetic modifications of genomes. The methods and compositions are suited for complete epigenome sequencing of any modification for which an antibody or an affinity binding agent has been developed. In one aspect, provided herein is a method for analyzing epigenetic modification of a genome. In some embodiments of aspects provided herein, the method further comprises sequencing a sequencing library to generate sequence reads, and assembling the sequence reads with aid of a positional barcode sequence information. In some embodiments of aspects provided herein, the method further comprises determining a location of at least two different epigenetic modifications of the nucleic acid. Another aspect of the present disclosure provides a kit for analyzing an epigenetic modification of a nucleic acid.