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Updated: Feb 4, 2026

Wild-type Blocking PCR Combined with Direct Sequencing as a Highly Sensitive Method for Detection of Low-Frequency Somatic Mutations

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

T-blocker: a simple and robust probe-free quantitative PCR assay to detect somatic mutations down to 0.1% frequency.

Hanyoup Kim¹, Aaron E Ruby¹, Harini G Shandilya¹

¹Canon US Life Sciences, Inc., 9800 Medical Center Drive Suite C-120, Rockville, MD 20850, USA.

|October 5, 2018

Summary

A new probe-free quantitative PCR (qPCR) method uses a T-blocker concept for highly sensitive detection of minor mutant alleles. This breakthrough enables precise detection of mutations as low as 0.1% in complex samples.

Keywords:

T-blocker intercalating dye qPCR somatic mutation detection

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Published on: April 14, 2015

Area of Science:

Molecular Biology
Genetics
Biotechnology

Background:

Allele-specific PCR is crucial for detecting genetic variations.
Existing methods often require complex probes, limiting accessibility and increasing costs.
Sensitive detection of low-frequency mutations is vital for diagnostics and research.

Purpose of the Study:

To develop a simple, probe-free quantitative PCR (qPCR) assay for sensitive mutant allele detection.
To introduce and validate a novel T-blocker concept for allele-specific PCR.
To establish KRAS and BRAF mutation detection assays with high sensitivity and specificity.

Main Methods:

Development of a novel T-blocker concept integrated into allele-specific PCR.
Creation of four specific assays for KRAS and BRAF mutations.
Utilization of a customized PCR protocol with intercalating dye-based qPCR chemistry.
Testing performance using a large number of replicates.

Main Results:

Achieved detection sensitivity for minor mutant alleles as low as 0.1% frequency.
Demonstrated highly efficient and specific amplification of mutant alleles.
Showcased selective wild-type suppression using the T-blocker concept.
Validated excellent consistency in sensitivity and specificity across assays.

Conclusions:

The T-blocker concept provides a simple and robust probe-free qPCR method for sensitive mutant allele detection.
This approach overcomes limitations of probe-based methods, offering a cost-effective alternative.
The developed assays are highly effective for detecting low-frequency KRAS and BRAF mutations.