A MutS-based protein chip for detection of DNA mutations

Area of Science:

• Molecular Biology
• Biotechnology
• Genetics

Background:

• Accurate detection of DNA sequence variations is crucial for genetic diagnostics and research.
• Existing methods for identifying DNA mismatches and unpaired bases can be limited in throughput and specificity.

Purpose of the Study:

• To develop a novel protein chip-based method for sensitive and specific detection of DNA sequence anomalies.
• To create a versatile platform for high-throughput genetic mutation analysis.

Main Methods:

• Construction and expression of a fusion protein, Trx-His6-Linker peptide-Strep-tagII-Linker peptide-MutS (THLSM), in E. coli.
• Purification of THLSM using Ni(2+)-chelation affinity chromatography.
• Immobilization of THLSM onto a streptavidin-coated chip via Strep-tag II-streptavidin interaction.
• Detection of single-base mismatches and unpaired bases in synthetic oligonucleotides and a clinical sample.

Main Results:

• The purified THLSM protein retained both DNA mismatch recognition and streptavidin binding functionalities.
• The developed protein chip demonstrated high specificity in detecting single-base mismatches and unpaired bases.
• The system successfully identified a single-base mutation in the rpoB gene of Mycobacterium tuberculosis.

Conclusions:

• The THLSM protein chip offers a sensitive and specific method for detecting DNA sequence variations.
• This approach provides a potential platform for developing high-throughput technologies for genetic mutation screening and analysis.