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2016 ; 6
(ä): 28625
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Characterization, correction and de novo assembly of an Oxford Nanopore genomic
dataset from Agrobacterium tumefaciens
#MMPMID27350167
Deschamps S
; Mudge J
; Cameron C
; Ramaraj T
; Anand A
; Fengler K
; Hayes K
; Llaca V
; Jones TJ
; May G
Sci Rep
2016[Jun]; 6
(ä): 28625
PMID27350167
show ga
The MinION is a portable single-molecule DNA sequencing instrument that was
released by Oxford Nanopore Technologies in 2014, producing long sequencing reads
by measuring changes in ionic flow when single-stranded DNA molecules translocate
through the pores. While MinION long reads have an error rate substantially
higher than the ones produced by short-read sequencing technologies, they can
generate de novo assemblies of microbial genomes, after an initial correction
step that includes alignment of Illumina sequencing data or detection of overlaps
between Oxford Nanopore reads to improve accuracy. In this study, MinION reads
were generated from the multi-chromosome genome of Agrobacterium tumefaciens
strain LBA4404. Errors in the consensus two-directional (sense and antisense)
"2D" sequences were first characterized by way of comparison with an internal
reference assembly. Both Illumina-based correction and self-correction were
performed and the resulting corrected reads assembled into high-quality hybrid
and non-hybrid assemblies. Corrected read datasets and assemblies were
subsequently compared. The results shown here indicate that both hybrid and
non-hybrid methods can be used to assemble Oxford Nanopore reads into informative
multi-chromosome assemblies, each with slightly different outcomes in terms of
contiguity and accuracy.