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Ultra-long Read Sequencing for Whole Genomic DNA Analysis
Published on: March 15, 2019
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Fully phased human genome assembly without parental data using single-cell strand sequencing and long reads
David Porubsky1, Peter Ebert2, Peter A Audano1
1Department of Genome Sciences, University of Washington School of Medicine, Seattle, WA, USA.
Nature Biotechnology
|December 8, 2020
Summary
This study presents a novel method for diploid de novo genome assembly without parental data, achieving highly accurate and contiguous phased genome assemblies. The approach utilizes single-cell strand sequencing with long-read technologies for comprehensive haplotype resolution.
Area of Science:
- Genomics
- Bioinformatics
- Molecular Biology
Background:
- Human genome assemblies traditionally lack parental haplotype information.
- Current methods often require parental data for accurate phasing.
Purpose of the Study:
- To develop a reference-free workflow for diploid de novo genome assembly.
- To achieve chromosome-wide phasing and scaffolding without parental data.
Main Methods:
- Combined single-cell strand sequencing with continuous long-read or high-fidelity sequencing.
- Developed a reference-free workflow for diploid de novo genome assembly.
Main Results:
- Produced a completely phased de novo genome assembly for both haplotypes of an individual (HG00733).
- Achieved accurate (quality value > 40) and highly contiguous (contig N50 > 23 Mbp) assemblies.
- Identified 154 preferential contig break regions across different sequencing technologies.
Conclusions:
- The developed workflow enables accurate, phased diploid genome assembly without parental data.
- This method provides fully phased variants, including single-nucleotide variants, indels, and structural variants.
- The findings offer insights into genome assembly limitations and potential improvements.
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