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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
Semi-automated unidirectional sequence analysis for mutation detection in a clinical diagnostic setting
Sian Ellard1, Beverley Shields, Carolyn Tysoe
1Department of Molecular Genetics, Royal Devon & Exeter NHS Foundation Trust, Exeter, United Kingdom. sian.ellard@rdeft.nhs.uk
Genetic Testing and Molecular Biomarkers
|May 2, 2009
Summary
Semiautomated unidirectional sequencing analysis demonstrates high sensitivity for detecting heterozygous base substitutions. This method is suitable for clinical diagnostics, reducing the need for bidirectional sequencing.
Area of Science:
- Genetics
- Bioinformatics
- Molecular Biology
Background:
- Advancements in sequencing technologies and automated software have improved mutation detection.
- Evaluating the efficacy of semiautomated unidirectional sequence analysis is crucial.
Purpose of the Study:
- To assess the sensitivity of semiautomated unidirectional sequence analysis for detecting heterozygous base substitutions.
- To compare automated and visual inspection methods for mutation detection.
- To investigate the necessity of bidirectional sequencing.
Main Methods:
- Compared detection rates of heterozygous base substitutions in 29 genes using automated and visual inspection.
- Surveyed UK genetics laboratories for missed heterozygous bases during bidirectional analysis.
- Assessed sequence quality in 50 patients for the ABCC8 gene using unidirectional sequencing.
Main Results:
- Semiautomated analysis detected 701 heterozygous base substitutions with sensitivity >=99.57%.
- Four instances of missed heterozygous bases in bidirectional analysis were reported; two were detected with unidirectional settings.
- High sequence quality was confirmed, with over 97% of amplicons and 98% of bases meeting quality score thresholds.
Conclusions:
- No evidence supports the routine requirement for bidirectional sequencing.
- Semiautomated analysis of high-quality unidirectional sequence data is sensitive and appropriate for clinical heterozygote mutation scanning.
- Further research is needed to establish minimum quality parameters for semiautomated analysis.
