Aqueous Amine Borane Compositions for Low-Damage DNA Methylation Detection
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Solution Overview
Problem
Existing methods for detecting methylated cytosines, such as sodium bisulfite sequencing, result in significant DNA degradation, and previously used borane compounds exacerbate this issue, necessitating new compositions and methods that reduce DNA degradation while accurately detecting methylated DNA.
Innovation Solution
The use of aqueous amine borane complexes, such as substituted pyridine, azole, and pyrimidine borane complexes, which are water-soluble and less reactive, to enzymatically convert methylcytosine or hydroxymethylcytosine to 5,6-dihydrouracil, allowing for accurate sequencing by polymerase chain reaction (PCR) without substantial DNA damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sodium bisulfite sequencing is used to detect methylated cytosines, then detection capability is achieved, but DNA degradation exceeds 95%
Solution Approach 1:
The patent changes the chemical parameters by replacing sodium bisulfite with aqueous amine borane complexes, which have different reactivity characteristics. This parameter change allows detection of methylated cytosines while significantly reducing DNA degradation from 95% to minimal levels.
Solution Approach 2:
The patent introduces enzymatic conversion as an intermediary step that converts methylated cytosines to a form detectable by the borane complexes. This intermediary approach enables accurate detection without the direct harsh chemical treatment that causes degradation.
2Measurement precision
If previously known boranes are used to detect methylated cytosines, then detection is achieved, but DNA degradation is exacerbated
Solution Approach 1:
The patent modifies the borane compound parameters by using aqueous amine borane complexes instead of traditional boranes. This change in chemical state (aqueous vs. anhydrous) and molecular structure (amine complex vs. simple borane) reduces reactivity toward DNA while maintaining detection capability.
Solution Approach 2:
The patent employs a multi-step process where the borane complexes are used in controlled, limited exposures. The enzymatic conversion step creates a stable intermediate that can be detected without requiring prolonged exposure to reactive borane compounds, effectively making the borane action brief and controlled.
3Loss of substance
If water-soluble and less reactive borane complexes are used, then DNA degradation is minimized, but reactivity for detection must be maintained
Solution Approach 1:
The patent performs preliminary enzymatic conversion of methylated cytosines to a more reactive form before applying the borane complexes. This preliminary action ensures that the subsequent borane treatment is highly specific and efficient, maintaining detection reliability even though the borane complexes themselves are less reactive.
Solution Approach 2:
The patent creates a composite detection system combining enzymes (for conversion) and aqueous amine borane complexes (for detection). This composite approach allows each component to perform its optimal function - the enzyme provides specificity and the borane complex provides detection - while together they achieve both low DNA degradation and high detection reliability.
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
These complexes enable high-yield, accurate detection of methylcytosine and hydroxymethylcytosine by minimizing DNA degradation and enabling a four-base sequencing scheme, suitable for practical commercial applications.
Implementation Method 1
using the composition to reduce the 5-carboxycytosine to 5,6-dihydrouracil
Implementation Method 2
using a ten-eleven translocation (TET) dioxygenase to oxidize any 5-methylcytosine or 5-hydroxymethylcytosine in the polynucleotide to 5-carboxycytosine
Data Source
AI summary
Disclosed herein are aqueous compositions that include a pyridine complex and a polynucleotide. The compositions can be used to detect methylcytosine and/or hydroxymethylcytosine in the polynucleotide. In some examples, the compositions may be used as part of a TET-assisted borane sequencing workflow.