Enzymatic Cytosine Reduction for Safer Epigenetic Modification Detection

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Solution Overview

Problem

Existing methods for detecting epigenetic cytosine modifications, such as the TAPS method, rely on toxic chemical reagents like pyridine borane for reducing the C5-C6 double bond of cytosine, posing environmental and safety concerns.

Innovation Solution

Employing enzymatic reduction using ene reductases to convert cytosine modifications like 5-formylcytosine and 5-carboxylcytosine to dihydrouracil, replacing the use of toxic chemical reagents.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If chemical reduction using pyridine borane is used to reduce the C5-C6 double bond of cytosine, then the reduction efficiency is high, but the toxicity and environmental harm increase

Engineering Contradiction:

Improvereduction efficiencyVSAvoidtoxicity

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical parameters of the reduction process by replacing pyridine borane with borane dimethyl sulfide complex. This substitution maintains the reducing capability while eliminating the toxic pyridine ring structure, thereby resolving the contradiction between reduction efficiency and toxicity

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a disposable, non-toxic reducing agent (borane dimethyl sulfide complex) that can be used in a single reaction cycle without requiring complex purification or disposal procedures, replacing the persistent toxic reagent pyridine borane

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If chemical reduction using pyridine borane is used to reduce the C5-C6 double bond of cytosine, then the reduction reaction proceeds effectively, but the environmental friendliness deteriorates

Engineering Contradiction:

Improvereduction reaction effectivenessVSAvoidenvironmental harm

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent modifies the chemical composition parameters by substituting the pyridine borane system with borane dimethyl sulfide complex, which maintains effective reduction capability while eliminating environmental persistence and toxicity issues

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent converts a potentially harmful chemical process into a benign one by using borane dimethyl sulfide complex, which decomposes into non-toxic products (boric acid and dimethyl sulfide), thereby transforming the reduction reaction from an environmentally harmful process to an environmentally friendly one

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

Provides a safe and environmentally-friendly method for detecting epigenetic cytosine modifications, reducing sample degradation and enabling higher sensitivity and alignment rates in sequencing.

Implementation Method 1

contacting cytosine in the nucleic acid with an ene reductase reduces the cytosine to 5,6-dihydro-U (DHU)

Methodology Applied

Scientific EffectEnzymatic reduction: Enzyme

Data Source

PatentUS20250361549A1Detection of epigenetic cytosine modification

Publication Date: 2025.11.27 ROCHE SEQUENCING SOLUTIONS INC

AI summary

The invention includes improved methods and compositions for reduction of a C5-C6 double bond of a cytosine. In particular, the improved methods and compositions for reduction of a C5-C6 double bond of a cytosine is via enzymatic means, not via chemical means. In particular, the disclosure is directed to methods of converting 5,6-dihydro-fC (fC) and/or 5,6-dihydro-caC to 5,6-dihydro-U (DHU). In particular, the disclosure is directed to methods of converting 5fC and/or 5caC to DHU. In addition, the disclosure is directed to methods for detection of epigenetic cytosine modification, particularly cytosine methylation, using ene reductases to reduce the C5-C6 double bond of cytosine.