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Published on: March 13, 2016
Phased nanopore assembly with Shasta and modular graph phasing with GFAse
Ryan Lorig-Roach1, Melissa Meredith2, Jean Monlong2
1UC Santa Cruz Genomics Institute, University of California, Santa Cruz, Santa Cruz, California 95060, USA; rlorigro@ucsc.edu pacarnev@ucsc.edu bpaten@ucsc.edu.
Abstract:
Reference-free genome phasing is vital for understanding allele inheritance and the impact of single-molecule DNA variation on phenotypes. To achieve thorough phasing across homozygous or repetitive regions of the genome, long-read sequencing technologies are often used to perform phased de novo assembly. As a step toward reducing the cost and complexity of this type of analysis, we describe new methods for accurately phasing Oxford Nanopore Technologies (ONT) sequence data with the Shasta genome assembler and a modular tool for extending phasing to the chromosome scale called GFAse. We test using new variants of ONT PromethION sequencing, including those using proximity ligation, and show that newer, higher accuracy ONT reads substantially improve assembly quality.
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