Direct Methylation Sequencing via Polymerase Kinetics
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Solution Overview
Problem
Current methods for determining genome-wide methylation patterns, such as bisulfite sequencing, face challenges including extensive sample preparation time, DNA degradation, and limitations in resolving repetitive genomic regions, making them unsuitable for comprehensive and high-resolution analysis.
Innovation Solution
A direct methylation sequencing technology that monitors the kinetics of single polymerase molecules in real-time, allowing for fast and economical analysis of methylation patterns, even in repetitive regions, by detecting changes in enzyme processing indicative of methylated bases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bisulfite sequencing is used to determine genome-wide methylation patterns, then methylation analysis can be performed, but extensive sample preparation time is required and DNA degradation occurs
Solution Approach 1:
The patent extracts the methylation detection function from the complex bisulfite sequencing process by using methyl-binding proteins that specifically bind to methylated DNA sequences. This allows direct detection of methylation patterns without requiring bisulfite conversion and extensive sample preparation, thereby reducing preparation time while maintaining detection capability
Solution Approach 2:
The patent introduces methyl-binding proteins as intermediary molecules that mediate between the DNA sample and detection system. These proteins specifically recognize and bind to methylated cytosine residues, enabling direct methylation detection without chemical conversion steps, thus eliminating the time-consuming bisulfite treatment protocol
2Measurement precision
If bisulfite sequencing is used for genome-wide methylation analysis, then methylation patterns can be identified, but DNA degradation occurs
Solution Approach 1:
The patent converts the harmful chemical treatment step into a beneficial approach by replacing bisulfite conversion with biological recognition using methyl-binding proteins. This eliminates DNA degradation while maintaining the ability to specifically identify methylation patterns, thereby preserving DNA integrity without sacrificing detection precision
Solution Approach 2:
Methyl-binding proteins serve as gentle intermediary molecules that recognize methylated DNA without causing chemical damage. This biological recognition system replaces the harsh chemical conversion process, maintaining DNA integrity while enabling accurate methylation pattern identification
3Measurement precision
If conventional sequencing methods are used, then methylation analysis can be performed, but limitations exist in resolving repetitive genomic regions
Solution Approach 1:
The patent creates a universal detection system using methyl-binding proteins that can recognize methylation patterns across all genomic regions including repetitive sequences. The system is not limited by sequence complexity or repetition, as the proteins specifically bind to the methylated cytosine motif regardless of surrounding sequence context, thereby achieving versatile applicability across diverse genomic regions
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 provides high-resolution, efficient detection of methylation patterns without the limitations of existing technologies, enabling better understanding of DNA methylation in human health and disease processes.
Implementation Method 1
A template nucleic acid and an enzyme capable of processing the template are provided. The template nucleic acid is contacted with the enzyme, and processing of the template by the enzyme is monitored. A change in processing is detected, and the change is indicative of the presence of the modification in the template.
Data Source
AI summary
Methods, compositions, and systems are provided for characterization of modified nucleic acids. In certain preferred embodiments, single molecule sequencing methods are provided for identification of modified nucleotides within nucleic acid sequences. Modifications detectable by the methods provided herein include chemically modified bases, enzymatically modified bases, abasic sites, non-natural bases, secondary structures, and agents bound to a template nucleic acid.