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ExpansionHunter: a sequence-graph-based tool to analyze variation in short tandem repeat regions
Egor Dolzhenko1, Viraj Deshpande1, Felix Schlesinger1
1Illumina Inc., San Diego, CA 92122, USA.
A new computational method and software, ExpansionHunter, accurately genotypes medically important repeat loci. This addresses challenges with variants and imperfect DNA repeats like polyalanine repeats.
Area of Science:
- Genomics
- Bioinformatics
- Computational Biology
Background:
- Accurate genotyping of repeat loci is crucial for understanding genetic diseases.
- Existing methods struggle with complex regions containing adjacent variants or imperfect repeats.
Purpose of the Study:
- To introduce a novel computational method for repeat genotyping using sequence graphs.
- To present an updated version of ExpansionHunter software incorporating this new method.
Main Methods:
- Development of a computational method utilizing sequence graphs for repeat genotyping.
- Implementation of the method in the ExpansionHunter software.
Main Results:
- The new method enables accurate genotyping of medically important repeat loci.
- ExpansionHunter can now target a broader class of challenging repeat regions.
Conclusions:
- This novel approach improves the accuracy of repeat genotyping.
- ExpansionHunter provides a valuable tool for analyzing complex genetic variations.
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