Installed
This software should be available with no extra configuration.
flye-2.9.2
Flye is a de novo assembler for single-molecule sequencing reads, such as
those produced by PacBio and Oxford Nanopore Technologies. It is designed for
a wide range of datasets, from small bacterial projects to large
mammalian-scale assemblies. The package represents a complete pipeline: it
takes raw PacBio / ONT reads as input and outputs polished contigs. Flye also
has a special mode for metagenome assembly.
Currently, Flye will produce collapsed assemblies of diploid genomes,
represented by a single mosaic haplotype. To recover two phased haplotypes
consider applying HapDup after the
assembly.
Location and version
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$ which flye
/local/cluster/bin/flye
$ flye --version
2.9.2-b1786
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help message
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$ flye --help
usage: flye (--pacbio-raw | --pacbio-corr | --pacbio-hifi | --nano-raw |
--nano-corr | --nano-hq ) file1 [file_2 ...]
--out-dir PATH
[--genome-size SIZE] [--threads int] [--iterations int]
[--meta] [--polish-target] [--min-overlap SIZE]
[--keep-haplotypes] [--debug] [--version] [--help]
[--scaffold] [--resume] [--resume-from] [--stop-after]
[--read-error float] [--extra-params]
[--deterministic]
Assembly of long reads with repeat graphs
optional arguments:
-h, --help show this help message and exit
--pacbio-raw path [path ...]
PacBio regular CLR reads (<20% error)
--pacbio-corr path [path ...]
PacBio reads that were corrected with other methods
(<3% error)
--pacbio-hifi path [path ...]
PacBio HiFi reads (<1% error)
--nano-raw path [path ...]
ONT regular reads, pre-Guppy5 (<20% error)
--nano-corr path [path ...]
ONT reads that were corrected with other methods (<3%
error)
--nano-hq path [path ...]
ONT high-quality reads: Guppy5+ SUP or Q20 (<5% error)
--subassemblies path [path ...]
[deprecated] high-quality contigs input
-g size, --genome-size size
estimated genome size (for example, 5m or 2.6g)
-o path, --out-dir path
Output directory
-t int, --threads int
number of parallel threads [1]
-i int, --iterations int
number of polishing iterations [1]
-m int, --min-overlap int
minimum overlap between reads [auto]
--asm-coverage int reduced coverage for initial disjointig assembly [not
set]
--hifi-error float [deprecated] same as --read-error
--read-error float adjust parameters for given read error rate (as
fraction e.g. 0.03)
--extra-params extra_params
extra configuration parameters list (comma-separated)
--plasmids unused (retained for backward compatibility)
--meta metagenome / uneven coverage mode
--keep-haplotypes do not collapse alternative haplotypes
--no-alt-contigs do not output contigs representing alternative
haplotypes
--scaffold enable scaffolding using graph [disabled by default]
--trestle [deprecated] enable Trestle [disabled by default]
--polish-target path run polisher on the target sequence
--resume resume from the last completed stage
--resume-from stage_name
resume from a custom stage
--stop-after stage_name
stop after the specified stage completed
--debug enable debug output
-v, --version show program's version number and exit
--deterministic perform disjointig assembly single-threaded
Input reads can be in FASTA or FASTQ format, uncompressed
or compressed with gz. Currently, PacBio (CLR, HiFi, corrected)
and ONT reads (regular, HQ, corrected) are supported. Expected error rates are
<15% for PB CLR/regular ONT; <5% for ONT HQ, <3% for corrected, and <1% for
HiFi. Note that Flye was primarily developed to run on uncorrected reads. You
may specify multiple files with reads (separated by spaces). Mixing different
read types is not yet supported. The --meta option enables the mode for
metagenome/uneven coverage assembly.
To reduce memory consumption for large genome assemblies,
you can use a subset of the longest reads for initial disjointig
assembly by specifying --asm-coverage and --genome-size options. Typically,
40x coverage is enough to produce good disjointigs.
You can run Flye polisher as a standalone tool using
--polish-target option.
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software ref: https://github.com/fenderglass/Flye
research ref: https://doi.org/10.1038/s41587-019-0072-8