Mesylate PCR Master Mix for Forensic Inhibitor Mitigation
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Solution Overview
Problem
PCR inhibitors present in forensic samples, such as blood, fabrics, and soil, interfere with nucleic acid amplification during polymerase chain reaction (PCR), leading to incomplete or failed amplifications, which hampers forensic genetic analysis.
Innovation Solution
A PCR master mix comprising a mesylate, such as potassium methanesulfonate, Tris-mesylate, bovine serum albumin, glycerol, deoxynucleoside triphosphates, and a DNA polymerase, which is used in conjunction with a thermal cycling protocol and electrophoretic separation to enhance nucleic acid amplification and overcome inhibitor effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PCR master mix is used, then the amplification process is simple and straightforward, but PCR inhibitors in forensic samples interfere with nucleic acid amplification leading to incomplete or failed amplifications
Solution Approach 1:
The patent introduces mesylate compounds as intermediary substances in the PCR master mix that mediate between the PCR inhibitors present in forensic samples and the DNA polymerase reaction. The mesylate acts as a protective agent that neutralizes or reduces the inhibitory effects of contaminants in blood, fabrics, soil and other forensic materials, thereby enabling successful amplification without requiring complex sample purification steps
Solution Approach 2:
The patent creates a composite PCR master mix formulation that combines traditional PCR components (buffer, dNTPs, primers, polymerase) with mesylate compounds. This composite formulation integrates multiple functional elements into a single reagent system that simultaneously maintains optimal PCR conditions while providing protection against a broad spectrum of PCR inhibitors through the mesylate component
2Reliability
If sample purification steps are added to remove inhibitors, then amplification success improves, but the process time and complexity increase
Solution Approach 1:
The mesylate compounds are incorporated into the PCR master mix in advance, performing the protective function against inhibitors before the actual PCR amplification begins. This preliminary incorporation eliminates the need for separate post-purification steps, as the protection is already in place when the reaction starts
Solution Approach 2:
The patent merges the inhibitor protection function with the PCR amplification reagents by incorporating mesylate compounds directly into the master mix. This combination consolidates multiple functions (buffer maintenance, nucleotide provision, enzyme protection, and inhibitor neutralization) into a single integrated reagent system, eliminating separate purification steps
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
The use of the mesylate-containing PCR master mix significantly improves the amplification of nucleic acids by mitigating the inhibitory effects of PCR inhibitors, resulting in increased resolution of amplicons and improved forensic analysis outcomes.
Implementation Method 1
a DNA polymerase
Implementation Method 2
electrophoretic separation
Implementation Method 3
thermal cycling protocol
Data Source
AI summary
Disclosed herein are mesylate containing compositions, methods of use of such compositions and kits of components encompassing such compositions for improving the amplification of nucleic acids, especially in the presence of enzymatic inhibitors. These find particular use in forensic and environmental analyses. The instant disclosure provides new compositions, methods and kits of components for overcoming PCR inhibition. In some embodiments disclosed herein is a PCR master mix, the PCR master mix encompassing a mesylate.