Related Experiment Video
Updated: May 19, 2026
11:11
Detection of Rare Mutations in CtDNA Using Next Generation Sequencing
Published on: August 24, 2017
Detection of ultra-rare mutations by next-generation sequencing
Michael W Schmitt1, Scott R Kennedy, Jesse J Salk
1Departments of Pathology, Genome Sciences, and Biochemistry, University of Washington School of Medicine, Seattle, WA 98195, USA.
Summary
Duplex Sequencing significantly improves DNA sequencing accuracy by independently analyzing both strands of a DNA molecule. This method drastically reduces errors, enabling precise detection of genetic mutations and DNA damage.
Area of Science:
- Genomics
- Molecular Biology
- Biotechnology
Background:
- Next-generation DNA sequencing generates vast amounts of data but suffers from a ~1% error rate.
- High error rates complicate the deep sequencing of genetically heterogeneous samples like tumors.
- Existing sequencing methods struggle with accuracy for sensitive applications.
Purpose of the Study:
- To develop a novel method for enhancing DNA sequencing accuracy.
- To overcome the limitations of current sequencing error rates in complex biological samples.
- To enable highly accurate detection of rare genetic variants and DNA damage.
Main Methods:
- Developed Duplex Sequencing, a method that tags and sequences both strands of a DNA duplex independently.
- Utilized the complementary nature of DNA strands to distinguish true mutations from technical errors.
- Applied Duplex Sequencing to assess random mutations in human mitochondrial DNA.
Main Results:
- Duplex Sequencing achieves a theoretical background error rate below one artifactual mutation per billion nucleotides.
- The method effectively identifies true mutations present in both DNA strands, discounting single-strand errors.
- Successfully assessed the frequency and patterns of random mutations in mitochondrial DNA.
Conclusions:
- Duplex Sequencing offers a substantial improvement in DNA sequencing accuracy.
- This technology is crucial for accurate analysis of genetically heterogeneous samples and for detecting low-frequency mutations.
- Duplex Sequencing provides a powerful tool for basic research and clinical applications, including mutation detection and DNA damage assessment.
Related Concept Videos
03:00Next-generation Sequencing
The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features.
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features.
01:57Sanger Sequencing
DNA sequencing is a fundamental technique that is routinely used in the biological sciences. This method can be applied to a range of questions at different scales - from the sequencing of a cloned DNA fragment or the study of a mutation in a gene up to whole-genome sequencing. However, despite the widespread use of sequencing today, it was not until 1977 that Fredrick Sanger and his collaborators developed the chain-termination method to decode DNA sequences. It relies on the separation of a...