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Updated: May 2, 2026
Wild-type Blocking PCR Combined with Direct Sequencing as a Highly Sensitive Method for Detection of Low-Frequency Somatic Mutations
Published on: March 29, 2017
Gel-based nonradioactive single-strand conformational polymorphism and mutation detection: limitations and solutions.
Vibhuti Gupta1, Reetakshi Arora, Sailesh Gochhait
1Human Genetics Section, School of Life Sciences, National Centre of Applied Human Genetics, Jawaharlal Nehru University, New Meharuli Road, New Delhi, 110067, India.
Single-strand conformation polymorphism (SSCP) is a cost-effective method for screening DNA mutations and single-nucleotide polymorphisms (SNPs). Optimizing polyacrylamide gel electrophoresis (PAGE) conditions enhances its ability to detect genetic variations and understand disease.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Single-strand conformation polymorphism (SSCP) is a widely used technique for detecting mutations and single-nucleotide polymorphisms (SNPs).
- It offers a cost-effective alternative to extensive DNA sequencing, enabling targeted analysis of polymerase chain reaction (PCR) products.
- The method relies on altered electrophoretic mobility of single-stranded DNA due to sequence-dependent conformational changes.
Purpose of the Study:
- To highlight the utility of SSCP as a screening tool for mutations and SNPs.
- To discuss the underlying principles of SSCP in detecting subtle DNA sequence variations.
- To address and propose solutions for common limitations encountered in SSCP analysis.
Main Methods:
- Utilizes polyacrylamide gel electrophoresis (PAGE) to separate DNA fragments based on their conformation.
- Involves denaturation of DNA into single strands, which then fold into sequence-specific structures.
- Detection of mutations/SNPs is achieved by observing altered migration patterns of these single strands.
Main Results:
- SSCP effectively screens for mutations and SNPs, reducing the need for full sequencing.
- Optimizing PAGE conditions (pH, temperature, gel composition, additives) can overcome resolution limitations.
- The technique allows for the identification of both spontaneous and induced genomic variations.
Conclusions:
- SSCP remains a valuable and economical method for analyzing mutations and SNPs.
- Controlling electrophoresis parameters is crucial for resolving conformational differences and improving detection accuracy.
- SSCP aids in understanding the genetic basis of diseases and genomic variations.
