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Mismatch Repair

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...

Mismatch Repair

Mismatch Repair

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Related Experiment Video

Updated: Apr 19, 2026

Author Spotlight: Advancements in DNA Nanosensors – Addressing Sensitivity and Selectivity Challenges in Molecular Detection

Author Spotlight: Advancements in DNA Nanosensors – Addressing Sensitivity and Selectivity Challenges in Molecular Detection

Published on: February 9, 2024

DNA biosensor based on hybridization refractory mutation system approach for single mismatch detection.

Hamdi Joda¹, Valerio Beni¹, Ioanis Katakis¹

¹INTERFIBIO Research Group, Departament d'Enginyeria Quimica, Universitat Rovira i Virgili, 43007 Tarragona, Spain.

Analytical Biochemistry

|December 20, 2014

Summary

This study introduces a novel DNA probe design for improved single base mismatch detection. The enhanced probe significantly improves accuracy in identifying genetic variations, crucial for diagnostics.

Keywords:

DQA1*05:05 allele Electrochemical genosensor Hybridization refractory mutation system Single base mismatch

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A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis

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Published on: September 10, 2014

Area of Science:

Molecular Biology
Genetics
Biotechnology

Background:

Solid-phase hybridization is vital for genetic analysis.
Discriminating single base mismatches is challenging, especially at high ionic strength.
Current methods require optimization for enhanced sensitivity.

Purpose of the Study:

To develop a simple approach for enhancing single base mismatch discrimination in solid-phase hybridization.
To improve the sensitivity and accuracy of detecting specific DNA sequences.
To validate the novel probe design for real-world applications.

Main Methods:

Designing a surface-tethered DNA probe with an incorporated natural DNA base mismatch.
Utilizing colorimetric and electrochemical detection methods for hybridization signal assessment.
Testing the probe's efficacy on amplified DQA1*05:05 allele from human blood samples.

Main Results:

The designed probe demonstrated a significant drop in hybridization signal for mismatched alleles (from 80% to <25% with colorimetric detection).
Electrochemical detection further improved discrimination to 20% signal, attributed to optimized probe spacing.
Successful electrochemical detection of the DQA1*05:05 allele in real human blood samples was achieved.

Conclusions:

Incorporating a deliberate mismatch in surface-tethered probes enhances single base mismatch discrimination.
Electrochemical detection offers superior sensitivity for this enhanced probe design.
The developed method shows promise for accurate genetic variant detection in clinical diagnostics.