Small Molecule Additives for DNA Amplification Specificity

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Solution Overview

Problem

Current DNA amplification methods, such as PCR and isothermal amplification, suffer from false positive signals due to transient primer secondary structure formation and primer dimers, leading to non-specific amplification and reduced quality of results.

Innovation Solution

A composition and method using a mixture of small molecules like N-alkylcarboxamide and carboxamide, or isobutyramide and N-methylformamide, added to the amplification reaction to inhibit non-template nucleic acid amplification, acting synergistically to reduce background noise.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If DNA amplification methods using primers are used, then amplification signal is enhanced, but false positive signals from non-specific amplification increase

Engineering Contradiction:

Improveamplification signalVSAvoidfalse positive signals

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent introduces a third component (a specific chemical additive or modification to the amplification system) that acts as an intermediary to prevent primer-dimer formation and non-specific amplification. This intermediary component selectively inhibits harmful interactions between primers while allowing specific target amplification to proceed, thereby resolving the contradiction between enhancing amplification signal and eliminating false positives.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent modifies chemical parameters of the amplification system by introducing specific additives (such as formamide, betaine, or other chemical compounds) that change the physical-chemical environment of the reaction. These parameter changes affect primer annealing behavior, reducing transient secondary structure formation and primer-dimer formation, thus eliminating false positives while maintaining or enhancing specific amplification signal.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If amplification specificity is improved, then non-specific amplification is reduced, but background signal remains problematic

Engineering Contradiction:

Improveamplification specificityVSAvoidbackground signal

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful background signal into a beneficial diagnostic feature by introducing control mechanisms that specifically detect and quantify non-specific amplification. By using the background signal itself as a measure of primer-dimer formation and non-specific binding, the system can adjust amplification conditions in real-time to eliminate false positives while maintaining specific target amplification.

Inventive Principle:

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

Data Source

PatentUS9546358B2Compositions and methods for reducing background DNA amplification

Publication Date: 2017.01.17 NEW ENGLAND BIOLABS INC

AI summary

Compositions are provided that include a plurality of small molecules selected from the group consisting of an amide, urea or acetone having a molecular weight less than 300 g/mol; and dNTPs and a polymerase in a buffer suitable for use as an amplification buffer. Methods of use of the compositions are also described for reducing non-template DNA amplification.