SPAdes 3.13.0 Manual

1. About SPAdes

SPAdes – St. Petersburg genome assembler – is an assembly toolkit containing various assembly pipelines. This manual will help you to install and run SPAdes. SPAdes version 3.13.0 was released under GPLv2 on October 11, 2018 and can be downloaded from http://cab.spbu.ru/software/spades/.

1.1 Supported data types

The current version of SPAdes works with Illumina or IonTorrent reads and is capable of providing hybrid assemblies using PacBio, Oxford Nanopore and Sanger reads. You can also provide additional contigs that will be used as long reads.

Version 3.13.0 of SPAdes supports paired-end reads, mate-pairs and unpaired reads. SPAdes can take as input several paired-end and mate-pair libraries simultaneously. Note, that SPAdes was initially designed for small genomes. It was tested on bacterial (both single-cell MDA and standard isolates), fungal and other small genomes. SPAdes is not intended for larger genomes (e.g. mammalian size genomes). For such purposes you can use it at your own risk.

SPAdes 3.13.0 includes the following additional pipelines:

• metaSPAdes – a pipeline for metagenomic data sets (see metaSPAdes options).
• plasmidSPAdes – a pipeline for extracting and assembling plasmids from WGS data sets (see plasmidSPAdes options).
• rnaSPAdes – a de novo transcriptome assembler from RNA-Seq data (see rnaSPAdes manual).
• truSPAdes – a module for TruSeq barcode assembly (see truSPAdes manual).

In addition, we provide several stand-alone binaries with relatively simple command-line interface: k-mer counting (spades-kmercounter), assembly graph construction (spades-gbuilder) and long read to graph aligner (spades-gmapper). To learn options of these tools you can either run them without any parameters or read this section.

1.2 SPAdes pipeline

SPAdes comes in several separate modules:

• BayesHammer – read error correction tool for Illumina reads, which works well on both single-cell and standard data sets.
• IonHammer – read error correction tool for IonTorrent data, which also works on both types of data.
• SPAdes – iterative short-read genome assembly module; values of K are selected automatically based on the read length and data set type.
• MismatchCorrector – a tool which improves mismatch and short indel rates in resulting contigs and scaffolds; this module uses the BWA tool [Li H. and Durbin R., 2009]; MismatchCorrector is turned off by default, but we recommend to turn it on (see SPAdes options section).

We recommend to run SPAdes with BayesHammer/IonHammer to obtain high-quality assemblies. However, if you use your own read correction tool, it is possible to turn error correction module off. It is also possible to use only the read error correction stage, if you wish to use another assembler. See the SPAdes options section.

1.3 SPAdes' performance

In this section we give approximate data about SPAdes' performance on two data sets:

• Standard isolate E. coli; 6.2Gb, 28M reads, 2x100bp, insert size ~ 215bp
• MDA single-cell E. coli; 6.3 Gb, 29M reads, 2x100bp, insert size ~ 270bp

We ran SPAdes with default parameters using 16 threads on a server with Intel Xeon 2.27GHz processors. The results for both datasets are pretty similar: BayesHammer runs in less than half an hour and takes up to 8Gb of RAM, assembly takes about 10 minutes and 9Gb of RAM (see notes below), MismatchCorrector runs for slightly more than 10 minutes and requires less than 2Gb of RAM. All modules also require additional disk space for storing results (corrected reads, contigs, etc) and temporary files. See the table below for more precise values.

Data set	E. coli isolate			E. coli single-cell
Stage	Time	Peak RAM usage (Gb)	Additional disk space (Gb)	Time	Peak RAM usage (Gb)	Additional disk space (Gb)
BayesHammer	24m	7.8	8.5	25m	7.7	8.6
SPAdes	8m	8.4	1.4	10m	8.3	2.1
MismatchCorrector	10m	1.7	21.4	12m	1.8	22.4
Whole pipeline	42m	8.4	23.9	47m	8.3	25.1

Notes:

• Running SPAdes without preliminary read error correction (e.g. without BayesHammer or IonHammer) will likely require more time and memory.
• Each module removes its temporary files as soon as it finishes.
• SPAdes uses 512 Mb per thread for buffers, which results in higher memory consumption. If you set memory limit manually, SPAdes will use smaller buffers and thus less RAM.
• Performance statistics is given for SPAdes version 3.13.0.

2. Installation

SPAdes requires a 64-bit Linux system or Mac OS and Python (supported versions are Python2: 2.4–2.7, and Python3: 3.2 and higher) to be pre-installed on it. To obtain SPAdes you can either download binaries or download source code and compile it yourself.

In case of successful installation the following files will be placed in the bin directory:

• spades.py (main executable script)
• metaspades.py (main executable script for metaSPAdes)
• plasmidspades.py (main executable script for plasmidSPAdes)
• rnaspades.py (main executable script for rnaSPAdes)
• truspades.py (main executable script for truSPAdes)
• spades-core (assembly module)
• spades-gbuilder (standalone graph builder application)
• spades-gmapper (standalone long read to graph aligner)
• spades-kmercount (standalone k-mer counting application)
• spades-hammer (read error correcting module for Illumina reads)
• spades-ionhammer (read error correcting module for IonTorrent reads)
• spades-bwa (BWA alignment module which is required for mismatch correction)
• spades-corrector-core (mismatch correction module)
• spades-truseq-scfcorrection (executable used in truSPAdes pipeline)

2.1 Downloading SPAdes Linux binaries

To download SPAdes Linux binaries and extract them, go to the directory in which you wish SPAdes to be installed and run:

    wget http://cab.spbu.ru/files/release3.13.0/SPAdes-3.13.0-Linux.tar.gz
    tar -xzf SPAdes-3.13.0-Linux.tar.gz
    cd SPAdes-3.13.0-Linux/bin/

SPAdes is ready to use and no further installation steps are required. We also suggest adding SPAdes installation directory to the PATH variable.

2.2 Downloading SPAdes binaries for Mac

To obtain SPAdes binaries for Mac, go to the directory in which you wish SPAdes to be installed and run:

    curl http://cab.spbu.ru/files/release3.13.0/SPAdes-3.13.0-Darwin.tar.gz -o SPAdes-3.13.0-Darwin.tar.gz
    tar -zxf SPAdes-3.13.0-Darwin.tar.gz
    cd SPAdes-3.13.0-Darwin/bin/

Just as in Linux, SPAdes is ready to use and no further installation steps are required. We also suggest adding SPAdes installation directory to the PATH variable.

2.3 Downloading and compiling SPAdes source code

If you wish to compile SPAdes by yourself you will need the following libraries to be pre-installed:

• g++ (version 5.3.1 or higher)
• cmake (version 2.8.12 or higher)
• zlib
• libbz2

If you meet these requirements, you can download the SPAdes source code:

    wget http://cab.spbu.ru/files/release3.13.0/SPAdes-3.13.0.tar.gz
    tar -xzf SPAdes-3.13.0.tar.gz
    cd SPAdes-3.13.0

and build it with the following script:

    ./spades_compile.sh

SPAdes will be built in the directory ./bin. If you wish to install SPAdes into another directory, you can specify full path of destination folder by running the following command in bash or sh:

    PREFIX=<destination_dir> ./spades_compile.sh

for example:

    PREFIX=/usr/local ./spades_compile.sh

which will install SPAdes into /usr/local/bin.

After the installation you will get the same files (listed above) in ./bin directory (or <destination_dir>/bin if you specified PREFIX). We also suggest adding SPAdes installation directory to the PATH variable.

2.4 Verifying your installation

For testing purposes, SPAdes comes with a toy data set (reads that align to first 1000 bp of E. coli). To try SPAdes on this data set, run:

    <spades installation dir>/spades.py --test

If you added SPAdes installation directory to the PATH variable, you can run:

    spades.py --test

If the installation is successful, you will find the following information at the end of the log:

===== Assembling finished. Used k-mer sizes: 21, 33, 55

 * Corrected reads are in spades_test/corrected/
 * Assembled contigs are in spades_test/contigs.fasta
 * Assembled scaffolds are in spades_test/scaffolds.fasta
 * Assembly graph is in spades_test/assembly_graph.fastg
 * Assembly graph in GFA format is in spades_test/assembly_graph.gfa
 * Paths in the assembly graph corresponding to the contigs are in spades_test/contigs.paths
 * Paths in the assembly graph corresponding to the scaffolds are in spades_test/scaffolds.paths

======= SPAdes pipeline finished.

========= TEST PASSED CORRECTLY.

SPAdes log can be found here: spades_test/spades.log

Thank you for using SPAdes!

3. Running SPAdes

3.1 SPAdes input

SPAdes takes as input paired-end reads, mate-pairs and single (unpaired) reads in FASTA and FASTQ. For IonTorrent data SPAdes also supports unpaired reads in unmapped BAM format (like the one produced by Torrent Server). However, in order to run read error correction, reads should be in FASTQ or BAM format. Sanger, Oxford Nanopore and PacBio CLR reads can be provided in both formats since SPAdes does not run error correction for these types of data.

To run SPAdes 3.13.0 you need at least one library of the following types:

• Illumina paired-end/high-quality mate-pairs/unpaired reads
• IonTorrent paired-end/high-quality mate-pairs/unpaired reads
• PacBio CCS reads

Illumina and IonTorrent libraries should not be assembled together. All other types of input data are compatible. SPAdes should not be used if only PacBio CLR, Oxford Nanopore, Sanger reads or additional contigs are available.

SPAdes supports mate-pair only assembly. However, we recommend to use only high-quality mate-pair libraries in this case (e.g. that do not have a paired-end part). We tested mate-pair only pipeline using Illumina Nextera mate-pairs. See more here.

Current version SPAdes also supports Lucigen NxSeq® Long Mate Pair libraries, which always have forward-reverse orientation. If you wish to use Lucigen NxSeq® Long Mate Pair reads, you will need Python regex library to be pre-installed on your machine. You can install it with Python pip-installer:

    pip install regex

    easy_install regex

Notes:

• It is strongly suggested to provide multiple paired-end and mate-pair libraries according to their insert size (from smallest to longest).
• It is not recommended to run SPAdes on PacBio reads with low coverage (less than 5).
• We suggest not to run SPAdes on PacBio reads for large genomes.
• SPAdes accepts gzip-compressed files.

Read-pair libraries

By using command line interface, you can specify up to nine different paired-end libraries, up to nine mate-pair libraries and also up to nine high-quality mate-pair ones. If you wish to use more, you can use YAML data set file. We further refer to paired-end and mate-pair libraries simply as to read-pair libraries.

By default, SPAdes assumes that paired-end and high-quality mate-pair reads have forward-reverse (fr) orientation and usual mate-pairs have reverse-forward (rf) orientation. However, different orientations can be set for any library by using SPAdes options.

To distinguish reads in pairs we refer to them as left and right reads. For forward-reverse orientation, the forward reads correspond to the left reads and the reverse reads, to the right. Similarly, in reverse-forward orientation left and right reads correspond to reverse and forward reads, respectively, etc.

Each read-pair library can be stored in several files or several pairs of files. Paired reads can be organized in two different ways:

• In file pairs. In this case left and right reads are placed in different files and go in the same order in respective files.
• In interleaved files. In this case, the reads are interlaced, so that each right read goes after the corresponding paired left read.

For example, Illumina produces paired-end reads in two files: R1.fastq and R2.fastq. If you choose to store reads in file pairs make sure that for every read from R1.fastq the corresponding paired read from R2.fastq is placed in the respective paired file on the same line number. If you choose to use interleaved files, every read from R1.fastq should be followed by the corresponding paired read from R2.fastq.

If adapter and/or quality trimming software has been used prior to assembly, files with the orphan reads can be provided as "single read files" for the corresponding read-pair library.

If you have merged some of the reads from your paired-end (not mate-pair or high-quality mate-pair) library (using tools s.a. BBMerge or STORM), you should provide the file with resulting reads as a "merged read file" for the corresponding library.
Note that non-empty files with the remaining unmerged left/right reads (separate or interlaced) must be provided for the same library (for SPAdes to correctly detect the original read length).

In an unlikely case some of the reads from your mate-pair (or high-quality mate-pair) library are "merged", you should provide the resulting reads as a SEPARATE single-read library.

Unpaired (single-read) libraries

By using command line interface, you can specify up to nine different single-read libraries. To input more libraries, you can use YAML data set file.

Single librairies are assumed to have high quality and a reasonable coverage. For example, you can provide PacBio CCS reads as a single-read library.

Note, that you should not specify PacBio CLR, Sanger reads or additional contigs as single-read libraries, each of them has a separate option.

PacBio and Oxford Nanopore reads

SPAdes can take as an input an unlimited number of PacBio and Oxford Nanopore libraries.

PacBio CLR and Oxford Nanopore reads are used for hybrid assemblies (e.g. with Illumina or IonTorrent). There is no need to pre-correct this kind of data. SPAdes will use PacBio CLR and Oxford Nanopore reads for gap closure and repeat resolution.

For PacBio you just need to have filtered subreads in FASTQ/FASTA format. Provide these filtered subreads using --pacbio option. Oxford Nanopore reads are provided with --nanopore option.

PacBio CCS/Reads of Insert reads or pre-corrected (using third-party software) PacBio CLR / Oxford Nanopore reads can be simply provided as single reads to SPAdes.

Additional contigs

In case you have contigs of the same genome generated by other assembler(s) and you wish to merge them into SPAdes assembly, you can specify additional contigs using --trusted-contigs or --untrusted-contigs. First option is used when high quality contigs are available. These contigs will be used for graph construction, gap closure and repeat resolution. Second option is used for less reliable contigs that may have more errors or contigs of unknown quality. These contigs will be used only for gap closure and repeat resolution. The number of additional contigs is unlimited.

Note, that SPAdes does not perform assembly using genomes of closely-related species. Only contigs of the same genome should be specified.

3.2 SPAdes command line options

To run SPAdes from the command line, type

    spades.py [options] -o <output_dir>

Basic options

-o <output_dir>
    Specify the output directory. Required option.

--sc
    This flag is required for MDA (single-cell) data.

--meta   (same as metaspades.py)
    This flag is recommended when assembling metagenomic data sets (runs metaSPAdes, see paper for more details). Currently metaSPAdes supports only a single short-read library which has to be paired-end (we hope to remove this restriction soon). In addition, you can provide long reads (e.g. using --pacbio or --nanopore options), but hybrid assembly for metagenomes remains an experimental pipeline and optimal performance is not guaranteed. It does not support careful mode (mismatch correction is not available). In addition, you cannot specify coverage cutoff for metaSPAdes. Note that metaSPAdes might be very sensitive to presence of the technical sequences remaining in the data (most notably adapter readthroughs), please run quality control and pre-process your data accordingly.

--plasmid   (same as plasmidspades.py)
    This flag is required when assembling only plasmids from WGS data sets (runs plasmidSPAdes, see paper for the algorithm details). Note, that plasmidSPAdes is not compatible with metaSPAdes and single-cell mode. Additionally, we do not recommend to run plasmidSPAdes on more than one library. See section 3.6 for plasmidSPAdes output details.

--rna   (same as rnaspades.py)
    This flag should be used when assembling RNA-Seq data sets (runs rnaSPAdes). To learn more, see rnaSPAdes manual.

--iontorrent
    This flag is required when assembling IonTorrent data. Allows BAM files as input. Carefully read section 3.3 before using this option.

--test
    Runs SPAdes on the toy data set; see section 2.4.

-h (or --help)
    Prints help.

-v (or --version)
    Prints SPAdes version.

--careful
    Tries to reduce the number of mismatches and short indels. Also runs MismatchCorrector – a post processing tool, which uses BWA tool (comes with SPAdes). This option is recommended only for assembly of small genomes. We strongly recommend not to use it for large and medium-size eukaryotic genomes. Note, that this options is is not supported by metaSPAdes and rnaSPAdes.

--continue
    Continues SPAdes run from the specified output folder starting from the last available check-point. Check-points are made after:

• error correction module is finished
• iteration for each specified K value of assembly module is finished
• mismatch correction is finished for contigs or scaffolds

--restart-from <check_point>
    Restart SPAdes run from the specified output folder starting from the specified check-point. Check-points are:

• ec – start from error correction
• as – restart assembly module from the first iteration
• k<int> – restart from the iteration with specified k values, e.g. k55 (not available in RNA-Seq mode)
• mc – restart mismatch correction
• last – restart from the last available check-point (similar to --continue)

--disable-gzip-output
    Forces read error correction module not to compress the corrected reads. If this options is not set, corrected reads will be in *.fastq.gz format.

Input data

--12 <file_name>
    File with interlaced forward and reverse paired-end reads.

-1 <file_name>
    File with forward reads.

-2 <file_name>
    File with reverse reads.

--merged <file_name>
    File with merged paired reads.
    If the properties of the library permit, overlapping paired-end reads can be merged using special software.
    Non-empty files with (remaining) unmerged left/right reads (separate or interlaced) must be provided for the same library for SPAdes to correctly detect the original read length.

-s <file_name>
    File with unpaired reads.

•  Single-read libraries

--s<#> <file_name>
    File for single-read library number <#> (<#> = 1,2,..,9). For example, for the first paired-end library the option is: --s1 <file_name>
    Do not use -s options for single-read libraries, since it specifies unpaired reads for the first paired-end library.

•  Paired-end libraries

--pe<#>-12 <file_name>
    File with interlaced reads for paired-end library number <#> (<#> = 1,2,..,9). For example, for the first single-read library the option is: --pe1-12 <file_name>


--pe<#>-1 <file_name>
    File with left reads for paired-end library number <#> (<#> = 1,2,..,9).

--pe<#>-2 <file_name>
    File with right reads for paired-end library number <#> (<#> = 1,2,..,9).

--pe<#>-m <file_name>
    File with merged reads from paired-end library number <#> (<#> = 1,2,..,9)
    If the properties of the library permit, paired reads can be merged using special software.     Non-empty files with (remaining) unmerged left/right reads (separate or interlaced) must be provided for the same library for SPAdes to correctly detect the original read length.

--pe<#>-s <file_name>
    File with unpaired reads from paired-end library number <#> (<#> = 1,2,..,9)
    For example, paired reads can become unpaired during the error correction procedure.

--pe<#>-<or>
    Relative orientation of read-pairs for paired-end library number <#> (<#> = 1,2,..,9; <or> = "fr","rf","ff").
    The default orientation for paired-end libraries is forward-reverse (--> <--). For example, to specify reverse-forward orientation for the second paired-end library, you should use the flag: --pe2-rf
    Should not be confused with FR and RF strand-specificity for RNA-Seq data (see rnaSPAdes manual).

•  Mate-pair libraries

--mp<#>-12 <file_name>
    File with interlaced reads for mate-pair library number <#> (<#> = 1,2,..,9).

--mp<#>-1 <file_name>
    File with left reads for mate-pair library number <#> (<#> = 1,2,..,9).

--mp<#>-2 <file_name>
    File with right reads for mate-pair library number <#> (<#> = 1,2,..,9).

--mp<#>-<or>
    Orientation of reads for mate-pair library number <#> (<#> = 1,2,..,9; <or> = "fr","rf","ff").
    The default orientation for mate-pair libraries is reverse-forward (<-- -->). For example, to specify forward-forward orientation for the first mate-pair library, you should use the flag: --mp1-ff


•  High-quality mate-pair libraries (can be used for mate-pair only assembly)

--hqmp<#>-12 <file_name>
    File with interlaced reads for high-quality mate-pair library number <#> (<#> = 1,2,..,9).

--hqmp<#>-1 <file_name>
    File with left reads for high-quality mate-pair library number <#> (<#> = 1,2,..,9).

--hqmp<#>-2 <file_name>
    File with right reads for high-quality mate-pair library number <#> (<#> = 1,2,..,9).

--hqmp<#>-s <file_name>
    File with unpaired reads from high-quality mate-pair library number <#> (<#> = 1,2,..,9)


--hqmp<#>-<or>
    Orientation of reads for high-quality mate-pair library number <#> (<#> = 1,2,..,9; <or> = "fr","rf","ff").
    The default orientation for high-quality mate-pair libraries is forward-reverse (--> <--). For example, to specify reverse-forward orientation for the first high-quality mate-pair library, you should use the flag: --hqmp1-rf


•  Lucigen NxSeq® Long Mate Pair libraries (see section 3.1 for details)

--nxmate<#>-1 <file_name>
    File with left reads for Lucigen NxSeq® Long Mate Pair library number <#> (<#> = 1,2,..,9).

--nxmate<#>-2 <file_name>
    File with right reads for Lucigen NxSeq® Long Mate Pair library number <#> (<#> = 1,2,..,9).

--pacbio <file_name>
    File with PacBio CLR reads. For PacBio CCS reads use -s option. More information on PacBio reads is provided in section 3.1.

--nanopore <file_name>
    File with Oxford Nanopore reads.

--sanger <file_name>
    File with Sanger reads

--trusted-contigs <file_name>
    Reliable contigs of the same genome, which are likely to have no misassemblies and small rate of other errors (e.g. mismatches and indels). This option is not intended for contigs of the related species.

--untrusted-contigs <file_name>
    Contigs of the same genome, quality of which is average or unknown. Contigs of poor quality can be used but may introduce errors in the assembly. This option is also not intended for contigs of the related species.

An alternative way to specify an input data set for SPAdes is to create a YAML data set file. By using a YAML file you can provide an unlimited number of paired-end, mate-pair and unpaired libraries. Basically, YAML data set file is a text file, in which input libraries are provided as a comma-separated list in square brackets. Each library is provided in braces as a comma-separated list of attributes. The following attributes are available:

• orientation ("fr", "rf", "ff")
• type ("paired-end", "mate-pairs", "hq-mate-pairs", "single", "pacbio", "nanopore", "sanger", "trusted-contigs", "untrusted-contigs")
• interlaced reads (comma-separated list of files with interlaced reads)
• left reads (comma-separated list of files with left reads)
• right reads (comma-separated list of files with right reads)
• single reads (comma-separated list of files with single reads or unpaired reads from paired library)
• merged reads (comma-separated list of files with merged reads)

To properly specify a library you should provide its type and at least one file with reads. For ONT, PacBio, Sanger and contig libraries you can provide only single reads. Orientation is an optional attribute. Its default value is "fr" (forward-reverse) for paired-end libraries and "rf" (reverse-forward) for mate-pair libraries.

The value for each attribute is given after a colon. Comma-separated lists of files should be given in square brackets. For each file you should provide its full path in double quotes. Make sure that files with right reads are given in the same order as corresponding files with left reads.

For example, if you have one paired-end library splitted into two pairs of files:

    lib_pe1_left_1.fastq
    lib_pe1_right_1.fastq
    lib_pe1_left_2.fastq
    lib_pe1_right_2.fastq

    lib_mp1_left.fastq
    lib_mp1_right.fastq

    pacbio_ccs.fastq
    pacbio_clr.fastq

    [
      {
        orientation: "fr",
        type: "paired-end",
        right reads: [
          "/FULL_PATH_TO_DATASET/lib_pe1_right_1.fastq",
          "/FULL_PATH_TO_DATASET/lib_pe1_right_2.fastq" 
        ],
        left reads: [
          "/FULL_PATH_TO_DATASET/lib_pe1_left_1.fastq",
          "/FULL_PATH_TO_DATASET/lib_pe1_left_2.fastq" 
        ]
      },
      {
        orientation: "rf",
        type: "mate-pairs",
        right reads: [
          "/FULL_PATH_TO_DATASET/lib_mp1_right.fastq" 
        ],
        left reads: [
          "/FULL_PATH_TO_DATASET/lib_mp1_left.fastq"
        ]
      },
      {
        type: "single",
        single reads: [
          "/FULL_PATH_TO_DATASET/pacbio_ccs.fastq" 
        ]
      },
      {
        type: "pacbio",
        single reads: [
          "/FULL_PATH_TO_DATASET/pacbio_clr.fastq" 
        ]
      }
    ]

Once you have created a YAML file save it with .yaml extension (e.g. as my_data_set.yaml) and run SPAdes using the --dataset option:
--dataset <your YAML file>

Notes:

• The --dataset option cannot be used with any other options for specifying input data.
• We recommend to nest all files with long reads of the same data type in a single library block.

-k <int,int,...>
    Comma-separated list of k-mer sizes to be used (all values must be odd, less than 128 and listed in ascending order). If --sc is set the default values are 21,33,55. For multicell data sets K values are automatically selected using maximum read length (see note for assembling long Illumina paired reads for details). To properly select K values for IonTorrent data read section 3.3.

--cov-cutoff <float>
    Read coverage cutoff value. Must be a positive float value, or 'auto', or 'off'. Default value is 'off'. When set to 'auto' SPAdes automatically computes coverage threshold using conservative strategy. Note, that this option is not supported by metaSPAdes.

--phred-offset <33 or 64>
    PHRED quality offset for the input reads, can be either 33 or 64. It will be auto-detected if it is not specified.

    spades.py --pe1-1 ../share/spades/test_dataset/ecoli_1K_1.fq.gz \
    --pe1-2 ../share/spades/test_dataset/ecoli_1K_2.fq.gz -o spades_test

    lib1_forward_1.fastq
    lib1_reverse_1.fastq
    lib1_forward_2.fastq
    lib1_reverse_2.fastq

    spades.py --pe1-1 lib1_forward_1.fastq --pe1-2 lib1_reverse_1.fastq \
    --pe1-1 lib1_forward_2.fastq --pe1-2 lib1_reverse_2.fastq \
    -o spades_output

    spades.py --pe1-12 lib1_1.fastq --pe1-12 lib1_2.fastq \
    --pe1-s lib1_unpaired_1.fastq --pe1-s lib1_unpaired_2.fastq \
    -o spades_output    

    lib_pe1_left.fastq
    lib_pe1_right.fastq

    lib_mp1_left.fastq
    lib_mp1_right.fastq

    lib_mp2_left.fastq
    lib_mp2_right.fastq

    spades.py --pe1-1 lib_pe1_left.fastq --pe1-2 lib_pe1_right.fastq \
    --mp1-1 lib_mp1_left.fastq --mp1-2 lib_mp1_right.fastq \
    --mp2-1 lib_mp2_left.fastq --mp2-2 lib_mp2_right.fastq \
    -o spades_output

    it_reads.fastq
    pacbio_clr.fastq
    contigs.fasta

    spades.py --iontorrent -s it_reads.fastq \
    --pacbio pacbio_clr.fastq --trusted-contigs contigs.fastq \
    -o spades_output

    unpaired1_1.fastq
    unpaired1_2.fastq
    unpaired1_3.fasta

    spades.py --s1 unpaired1_1.fastq \
    --s1 unpaired1_2.fastq --s1 unpaired1_3.fastq \
    -o spades_output

    spades.py -k 21,33,55,77 --careful --only-assembler <your reads> -o spades_output

    spades.py -k 21,33,55,77 --careful <your reads> -o spades_output

    spades.py -k 21,33,55,77,99,127 --careful --only-assembler <your reads> -o spades_output

    spades.py -k 21,33,55,77,99,127 --careful <your reads> -o spades_output

    
    >EDGE_2_length_33280_cov_199.702
    >EDGE_5_length_84_cov_321.414'
    >EDGE_3_length_111_cov_175.304
    >EDGE_5_length_84_cov_321.414'
    >EDGE_4_length_66661_cov_223.548
    

    
    NODE_5_length_100000_cov_215.651
    2+,5-,3+,5-,4+
    

    
    NODE_3_length_237403_cov_243.207
    21-,17-,15+,17-,16+;
    31+,23-,22+,23-,4-
    

    scaffolds.fasta – resulting scaffolds (recommended for use as resulting sequences)
    contigs.fasta – resulting contigs
    assembly_graph.fastg – assembly graph
    contigs.paths – contigs paths in the assembly graph
    scaffolds.paths – scaffolds paths in the assembly graph
    before_rr.fasta – contigs before repeat resolution

    corrected/ – files from read error correction
        configs/ – configuration files for read error correction
        corrected.yaml – internal configuration file
        Output files with corrected reads

    params.txt – information about SPAdes parameters in this run
    spades.log – SPAdes log
    dataset.info – internal configuration file
    input_dataset.yaml – internal YAML data set file
    K<##>/ – directory containing intermediate files from the run with K=<##>. These files should not be used as assembly results; use resulting contigs/scaffolds in files mentioned above.