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main.nf
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#!/usr/bin/env nextflow
/*
===============================================================
nf-core/rnaseq
===============================================================
RNA-Seq Analysis Pipeline. Started March 2016.
#### Homepage / Documentation
https://github.com/nf-core/rnaseq
#### Authors
Phil Ewels @ewels <phil.ewels@scilifelab.se>
Rickard Hammarén @Hammarn <rickard.hammaren@scilifelab.se>
---------------------------------------------------------------
*/
def helpMessage() {
log.info """
=======================================================
,--./,-.
___ __ __ __ ___ /,-._.--~\'
|\\ | |__ __ / ` / \\ |__) |__ } {
| \\| | \\__, \\__/ | \\ |___ \\`-._,-`-,
`._,._,\'
nf-core/rnaseq : RNA-Seq Best Practice v${params.pipelineVersion}
=======================================================
Usage:
The typical command for running the pipeline is as follows:
nextflow run nf-core/rnaseq --reads '*_R{1,2}.fastq.gz' --genome GRCh37 -profile uppmax
Mandatory arguments:
--reads Path to input data (must be surrounded with quotes)
--genome Name of iGenomes reference
-profile Configuration profile to use. uppmax / uppmax_modules / hebbe / docker / aws
Options:
--singleEnd Specifies that the input is single end reads
--mergeLanes Specifies to merge samples that were sequenced on multiple lanes together
--mergeRegex Specifies the required regular expression to use for merging multiple lanes together
Strandedness:
--forward_stranded The library is forward stranded
--reverse_stranded The library is reverse stranded
--unstranded The default behaviour
References If not specified in the configuration file or you wish to overwrite any of the references.
--star_index Path to STAR index
--hisat2_index Path to HiSAT2 index
--fasta Path to Fasta reference
--gtf Path to GTF file
--gff Path to GFF3 file
--bed12 Path to bed12 file
--downloadFasta If no STAR / Fasta reference is supplied, a URL can be supplied to download a Fasta file at the start of the pipeline.
--downloadGTF If no GTF reference is supplied, a URL can be supplied to download a Fasta file at the start of the pipeline.
--saveReference Save the generated reference files the the Results directory.
--saveTrimmed Save trimmed FastQ file intermediates
--saveAlignedIntermediates Save the BAM files from the Aligment step - not done by default
Trimming options
--clip_r1 [int] Instructs Trim Galore to remove bp from the 5' end of read 1 (or single-end reads)
--clip_r2 [int] Instructs Trim Galore to remove bp from the 5' end of read 2 (paired-end reads only)
--three_prime_clip_r1 [int] Instructs Trim Galore to remove bp from the 3' end of read 1 AFTER adapter/quality trimming has been performed
--three_prime_clip_r2 [int] Instructs Trim Galore to re move bp from the 3' end of read 2 AFTER adapter/quality trimming has been performed
Presets:
--pico Sets trimming and standedness settings for the SMARTer Stranded Total RNA-Seq Kit - Pico Input kit. Equivalent to: --forward_stranded --clip_r1 3 --three_prime_clip_r2 3
Other options:
--outdir The output directory where the results will be saved
-w/--work-dir The temporary directory where intermediate data will be saved
--email Set this parameter to your e-mail address to get a summary e-mail with details of the run sent to you when the workflow exits
--sampleLevel Used to turn of the edgeR MDS and heatmap. Set automatically when running on fewer than 3 samples
--clusterOptions Extra SLURM options, used in conjunction with Uppmax.config
--maxMultiqcEmailFileSize Theshold size for MultiQC report to be attached in notification email. If file generated by pipeline exceeds the threshold, it will not be attached (Default: 25MB)
-name Name for the pipeline run. If not specified, Nextflow will automatically generate a random mnemonic.
--seqCenter Add sequencing center in @RG line of output BAM header
QC options:
--skip_qc Skip all QC steps apart from MultiQC
--skip_fastqc Skip FastQC
--skip_rseqc Skip RSeQC
--skip_genebody_coverage Skip calculating genebody coverage
--skip_preseq Skip Preseq
--skip_dupradar Skip dupRadar (and Picard MarkDups)
--skip_edger Skip edgeR MDS plot and heatmap
--skip_multiqc Skip MultiQC
AWSBatch options:
--awsqueue The AWSBatch JobQueue that needs to be set when running on AWSBatch
--awsregion The AWS Region for your AWS Batch job to run on
""".stripIndent()
}
/*
* SET UP CONFIGURATION VARIABLES
*/
// Show help emssage
params.help = false
if (params.help){
helpMessage()
exit 0
}
// Check if genome exists in the config file
if (params.genomes && params.genome && !params.genomes.containsKey(params.genome)) {
exit 1, "The provided genome '${params.genome}' is not available in the iGenomes file. Currently the available genomes are ${params.genomes.keySet().join(", ")}"
}
// Configurable variables
params.name = false
params.project = false
params.genome = false
params.star_index = params.genome ? params.genomes[ params.genome ].star ?: false : false
params.fasta = params.genome ? params.genomes[ params.genome ].fasta ?: false : false
params.gtf = params.genome ? params.genomes[ params.genome ].gtf ?: false : false
params.gff = params.genome ? params.genomes[ params.genome ].gff ?: false : false
params.bed12 = params.genome ? params.genomes[ params.genome ].bed12 ?: false : false
params.hisat2_index = params.genome ? params.genomes[ params.genome ].hisat2 ?: false : false
params.multiqc_config = "$baseDir/assets/multiqc_config.yaml"
params.email = false
params.plaintext_email = false
params.seqCenter = false
params.mergeLanes = false
params.mergeRegex = '^.*?(?=L)'
params.skip_qc = false
params.skip_fastqc = false
params.skip_rseqc = false
params.skip_genebody_coverage = false
params.skip_preseq = false
params.skip_dupradar = false
params.skip_edger = false
params.skip_multiqc = false
mdsplot_header = file("$baseDir/assets/mdsplot_header.txt")
heatmap_header = file("$baseDir/assets/heatmap_header.txt")
biotypes_header = file("$baseDir/assets/biotypes_header.txt")
multiqc_config = file(params.multiqc_config)
output_docs = file("$baseDir/docs/output.md")
wherearemyfiles = file("$baseDir/assets/where_are_my_files.txt")
// Define regular variables so that they can be overwritten
clip_r1 = params.clip_r1
clip_r2 = params.clip_r2
three_prime_clip_r1 = params.three_prime_clip_r1
three_prime_clip_r2 = params.three_prime_clip_r2
forward_stranded = params.forward_stranded
reverse_stranded = params.reverse_stranded
unstranded = params.unstranded
// Preset trimming options
params.pico = false
if (params.pico){
clip_r1 = 3
clip_r2 = 0
three_prime_clip_r1 = 0
three_prime_clip_r2 = 3
forward_stranded = true
reverse_stranded = false
unstranded = false
}
// Validate inputs
if (params.aligner != 'star' && params.aligner != 'hisat2'){
exit 1, "Invalid aligner option: ${params.aligner}. Valid options: 'star', 'hisat2'"
}
if( params.star_index && params.aligner == 'star' ){
star_index = Channel
.fromPath(params.star_index)
.ifEmpty { exit 1, "STAR index not found: ${params.star_index}" }
}
else if ( params.hisat2_index && params.aligner == 'hisat2' ){
hs2_indices = Channel
.fromPath("${params.hisat2_index}*")
.ifEmpty { exit 1, "HISAT2 index not found: ${params.hisat2_index}" }
}
else if ( params.fasta ){
fasta = file(params.fasta)
if( !fasta.exists() ) exit 1, "Fasta file not found: ${params.fasta}"
}
else {
exit 1, "No reference genome specified!"
}
if( params.gtf ){
Channel
.fromPath(params.gtf)
.ifEmpty { exit 1, "GTF annotation file not found: ${params.gtf}" }
.into { gtf_makeSTARindex; gtf_makeHisatSplicesites; gtf_makeHISATindex; gtf_makeBED12;
gtf_star; gtf_dupradar; gtf_featureCounts; gtf_stringtieFPKM }
} else if( params.gff ){
gffFile = Channel.fromPath(params.gff)
.ifEmpty { exit 1, "GFF annotation file not found: ${params.gff}" }
} else {
exit 1, "No GTF or GFF3 annotation specified!"
}
if( params.bed12 ){
bed12 = Channel
.fromPath(params.bed12)
.ifEmpty { exit 1, "BED12 annotation file not found: ${params.bed12}" }
.into {bed_rseqc; bed_genebody_coverage}
}
if( params.aligner == 'hisat2' && params.splicesites ){
Channel
.fromPath(params.bed12)
.ifEmpty { exit 1, "HISAT2 splice sites file not found: $alignment_splicesites" }
.into { indexing_splicesites; alignment_splicesites }
}
if( workflow.profile == 'uppmax' || workflow.profile == 'uppmax-devel' ){
if ( !params.project ) exit 1, "No UPPMAX project ID found! Use --project"
}
//AWSBatch sanity checking
if(workflow.profile == 'awsbatch'){
if (!params.awsqueue || !params.awsregion) exit 1, "Specify correct --awsqueue and --awsregion parameters on AWSBatch!"
if (!workflow.workDir.startsWith('s3') || !params.outdir.startsWith('s3')) exit 1, "Specify S3 URLs for workDir and outdir parameters on AWSBatch!"
}
// Has the run name been specified by the user?
// this has the bonus effect of catching both -name and --name
custom_runName = params.name
if( !(workflow.runName ==~ /[a-z]+_[a-z]+/) ){
custom_runName = workflow.runName
}
/*
* Create a channel for input read files
*/
if(params.readPaths){
if(params.singleEnd){
Channel
.from(params.readPaths)
.map { row -> [ row[0], [file(row[1][0])]] }
.ifEmpty { exit 1, "params.readPaths was empty - no input files supplied" }
.into { raw_reads_fastqc; raw_reads_trimgalore }
} else {
Channel
.from(params.readPaths)
.map { row -> [ row[0], [file(row[1][0]), file(row[1][1])]] }
.ifEmpty { exit 1, "params.readPaths was empty - no input files supplied" }
.into { raw_reads_fastqc; raw_reads_trimgalore }
}
} else {
Channel
.fromFilePairs( params.reads, size: params.singleEnd ? 1 : 2 )
.ifEmpty { exit 1, "Cannot find any reads matching: ${params.reads}\nNB: Path needs to be enclosed in quotes!\nNB: Path requires at least one * wildcard!\nIf this is single-end data, please specify --singleEnd on the command line." }
.into { raw_reads_fastqc; raw_reads_trimgalore }
}
log.info """=======================================================
,--./,-.
___ __ __ __ ___ /,-._.--~\'
|\\ | |__ __ / ` / \\ |__) |__ } {
| \\| | \\__, \\__/ | \\ |___ \\`-._,-`-,
`._,._,\'
nf-core/rnaseq : RNA-Seq Best Practice v${params.pipelineVersion}
======================================================="""
def summary = [:]
summary['Run Name'] = custom_runName ?: workflow.runName
summary['Reads'] = params.reads
summary['Data Type'] = params.singleEnd ? 'Single-End' : 'Paired-End'
summary['Genome'] = params.genome
if( params.pico ) summary['Library Prep'] = "SMARTer Stranded Total RNA-Seq Kit - Pico Input"
summary['Strandedness'] = ( unstranded ? 'None' : forward_stranded ? 'Forward' : reverse_stranded ? 'Reverse' : 'None' )
summary['Merge Lanes?'] = params.mergeLanes
summary['Trim R1'] = clip_r1
summary['Trim R2'] = clip_r2
summary["Trim 3' R1"] = three_prime_clip_r1
summary["Trim 3' R2"] = three_prime_clip_r2
if(params.aligner == 'star'){
summary['Aligner'] = "STAR"
if(params.star_index) summary['STAR Index'] = params.star_index
else if(params.fasta) summary['Fasta Ref'] = params.fasta
} else if(params.aligner == 'hisat2') {
summary['Aligner'] = "HISAT2"
if(params.hisat2_index) summary['HISAT2 Index'] = params.hisat2_index
else if(params.fasta) summary['Fasta Ref'] = params.fasta
if(params.splicesites) summary['Splice Sites'] = params.splicesites
}
if(params.gtf) summary['GTF Annotation'] = params.gtf
if(params.gff) summary['GFF3 Annotation'] = params.gff
if(params.bed12) summary['BED Annotation'] = params.bed12
summary['Save Reference'] = params.saveReference ? 'Yes' : 'No'
summary['Save Trimmed'] = params.saveTrimmed ? 'Yes' : 'No'
summary['Save Intermeds'] = params.saveAlignedIntermediates ? 'Yes' : 'No'
summary['Max Memory'] = params.max_memory
summary['Max CPUs'] = params.max_cpus
summary['Max Time'] = params.max_time
summary['Output dir'] = params.outdir
summary['Working dir'] = workflow.workDir
summary['Container'] = workflow.container
if(workflow.revision) summary['Pipeline Release'] = workflow.revision
summary['Current home'] = "$HOME"
summary['Current user'] = "$USER"
summary['Current path'] = "$PWD"
summary['Script dir'] = workflow.projectDir
summary['Config Profile'] = workflow.profile
if(params.project) summary['UPPMAX Project'] = params.project
if(params.email) {
summary['E-mail Address'] = params.email
summary['MultiQC maxsize'] = params.maxMultiqcEmailFileSize
}
log.info summary.collect { k,v -> "${k.padRight(15)}: $v" }.join("\n")
log.info "========================================="
// Show a big error message if we're running on the base config and an uppmax cluster
if( workflow.profile == 'standard'){
if ( "hostname".execute().text.contains('.uppmax.uu.se') ) {
log.error "====================================================\n" +
" WARNING! You are running with the default 'standard'\n" +
" pipeline config profile, which runs on the head node\n" +
" and assumes all software is on the PATH.\n" +
" ALL JOBS ARE RUNNING LOCALLY and stuff will probably break.\n" +
" Please use `-profile uppmax` to run on UPPMAX clusters.\n" +
"============================================================"
}
}
/*
* PREPROCESSING - Build STAR index
*/
if(params.aligner == 'star' && !params.star_index && fasta){
process makeSTARindex {
tag fasta
publishDir path: { params.saveReference ? "${params.outdir}/reference_genome" : params.outdir },
saveAs: { params.saveReference ? it : null }, mode: 'copy'
input:
file fasta from fasta
file gtf from gtf_makeSTARindex
output:
file "star" into star_index
script:
def avail_mem = task.memory == null ? '' : "--limitGenomeGenerateRAM ${task.memory.toBytes() - 100000000}"
"""
mkdir star
STAR \\
--runMode genomeGenerate \\
--runThreadN ${task.cpus} \\
--sjdbGTFfile $gtf \\
--genomeDir star/ \\
--genomeFastaFiles $fasta \\
$avail_mem
"""
}
}
/*
* PREPROCESSING - Build HISAT2 splice sites file
*/
if(params.aligner == 'hisat2' && !params.splicesites){
process makeHisatSplicesites {
tag "$gtf"
publishDir path: { params.saveReference ? "${params.outdir}/reference_genome" : params.outdir },
saveAs: { params.saveReference ? it : null }, mode: 'copy'
input:
file gtf from gtf_makeHisatSplicesites
output:
file "${gtf.baseName}.hisat2_splice_sites.txt" into indexing_splicesites, alignment_splicesites
script:
"""
hisat2_extract_splice_sites.py $gtf > ${gtf.baseName}.hisat2_splice_sites.txt
"""
}
}
/*
* PREPROCESSING - Build HISAT2 index
*/
if(params.aligner == 'hisat2' && !params.hisat2_index && fasta){
process makeHISATindex {
tag "$fasta"
publishDir path: { params.saveReference ? "${params.outdir}/reference_genome" : params.outdir },
saveAs: { params.saveReference ? it : null }, mode: 'copy'
input:
file fasta from fasta
file indexing_splicesites from indexing_splicesites
file gtf from gtf_makeHISATindex
output:
file "${fasta.baseName}.*.ht2" into hs2_indices
script:
if( task.memory == null ){
log.info "[HISAT2 index build] Available memory not known - defaulting to 0. Specify process memory requirements to change this."
avail_mem = 0
} else {
log.info "[HISAT2 index build] Available memory: ${task.memory}"
avail_mem = task.memory.toGiga()
}
if( avail_mem > params.hisatBuildMemory ){
log.info "[HISAT2 index build] Over ${params.hisatBuildMemory} GB available, so using splice sites and exons in HISAT2 index"
extract_exons = "hisat2_extract_exons.py $gtf > ${gtf.baseName}.hisat2_exons.txt"
ss = "--ss $indexing_splicesites"
exon = "--exon ${gtf.baseName}.hisat2_exons.txt"
} else {
log.info "[HISAT2 index build] Less than ${params.hisatBuildMemory} GB available, so NOT using splice sites and exons in HISAT2 index."
log.info "[HISAT2 index build] Use --hisatBuildMemory [small number] to skip this check."
extract_exons = ''
ss = ''
exon = ''
}
"""
$extract_exons
hisat2-build -p ${task.cpus} $ss $exon $fasta ${fasta.baseName}.hisat2_index
"""
}
}
/*
* PREPROCESSING - Convert GFF3 to GTF
*/
if(params.gff){
process convertGFFtoGTF {
tag "$gff"
input:
file gff from gffFile
output:
file "${gff.baseName}.gtf" into gtf_makeSTARindex, gtf_makeHisatSplicesites, gtf_makeHISATindex, gtf_makeBED12,
gtf_star, gtf_dupradar, gtf_featureCounts, gtf_stringtieFPKM
script:
"""
gffread $gff -T -o > ${gff.baseName}.gtf
"""
}
}
/*
* PREPROCESSING - Build BED12 file
*/
if(!params.bed12){
process makeBED12 {
tag "$gtf"
publishDir path: { params.saveReference ? "${params.outdir}/reference_genome" : params.outdir },
saveAs: { params.saveReference ? it : null }, mode: 'copy'
input:
file gtf from gtf_makeBED12
output:
file "${gtf.baseName}.bed" into bed_rseqc, bed_genebody_coverage
script: // This script is bundled with the pipeline, in nfcore/rnaseq/bin/
"""
gtf2bed $gtf > ${gtf.baseName}.bed
"""
}
}
//TODO check this out!
if("$params.mergeLanes"){
raw_reads_fastqc
.map{ it -> [ extract_lanes(it, params.mergeRegex), it ] }
.groupTuple()
.set { raw_grouped_fastqs }
}
if (params.verbose) fastqs = raw_grouped_fastqs.view {
"FastQs to process:\n\
${it[0]}\n\
${it[1]}\n\
${it[2]}\n\
${it[3]}\n"
}
/*
* Step 0 - mergeLanes (if set)
*
*/
process mergeLanes {
tag "$name"
publishDir "${params.outdir}/merged_fastq", mode: 'copy'
when: "${params.mergeLanes}"
input:
set prefix, file(reads) from raw_grouped_fastqs
output:
set val(name), file(reads) into raw_reads_fastqc_merged, raw_reads_trimgalore_merged
script:
'''
samtools merge --threads ${task.cpus} $reads ${name}.merged.bam
'''
}
/*
* STEP 1 - FastQC
*/
process fastqc {
tag "$name"
publishDir "${params.outdir}/fastqc", mode: 'copy',
saveAs: {filename -> filename.indexOf(".zip") > 0 ? "zips/$filename" : "$filename"}
when:
!params.skip_qc && !params.skip_fastqc
input:
set val(name), file(reads) from (params.mergeLanes ? raw_reads_fastqc_merged : raw_reads_fastqc)
output:
file "*_fastqc.{zip,html}" into fastqc_results
script:
"""
fastqc -q $reads
"""
}
/*
* STEP 2 - Trim Galore!
*/
process trim_galore {
tag "$name"
publishDir "${params.outdir}/trim_galore", mode: 'copy',
saveAs: {filename ->
if (filename.indexOf("_fastqc") > 0) "FastQC/$filename"
else if (filename.indexOf("trimming_report.txt") > 0) "logs/$filename"
else if (!params.saveTrimmed && filename == "where_are_my_files.txt") filename
else if (params.saveTrimmed && filename != "where_are_my_files.txt") filename
else null
}
input:
set val(name), file(reads) from (params.mergeLanes ? raw_reads_trimgalore_merged : raw_reads_trimgalore)
file wherearemyfiles
output:
file "*fq.gz" into trimmed_reads
file "*trimming_report.txt" into trimgalore_results
file "*_fastqc.{zip,html}" into trimgalore_fastqc_reports
file "where_are_my_files.txt"
script:
c_r1 = clip_r1 > 0 ? "--clip_r1 ${clip_r1}" : ''
c_r2 = clip_r2 > 0 ? "--clip_r2 ${clip_r2}" : ''
tpc_r1 = three_prime_clip_r1 > 0 ? "--three_prime_clip_r1 ${three_prime_clip_r1}" : ''
tpc_r2 = three_prime_clip_r2 > 0 ? "--three_prime_clip_r2 ${three_prime_clip_r2}" : ''
if (params.singleEnd) {
"""
trim_galore --fastqc --gzip $c_r1 $tpc_r1 $reads
"""
} else {
"""
trim_galore --paired --fastqc --gzip $c_r1 $c_r2 $tpc_r1 $tpc_r2 $reads
"""
}
}
/*
* STEP 3 - align with STAR
*/
// Function that checks the alignment rate of the STAR output
// and returns true if the alignment passed and otherwise false
skipped_poor_alignment = []
def check_log(logs) {
def percent_aligned = 0;
logs.eachLine { line ->
if ((matcher = line =~ /Uniquely mapped reads %\s*\|\s*([\d\.]+)%/)) {
percent_aligned = matcher[0][1]
}
}
logname = logs.getBaseName() - 'Log.final'
if(percent_aligned.toFloat() <= '5'.toFloat() ){
log.info "#################### VERY POOR ALIGNMENT RATE! IGNORING FOR FURTHER DOWNSTREAM ANALYSIS! ($logname) >> ${percent_aligned}% <<"
skipped_poor_alignment << logname
return false
} else {
log.info " Passed alignment > star ($logname) >> ${percent_aligned}% <<"
return true
}
}
if(params.aligner == 'star'){
hisat_stdout = Channel.from(false)
process star {
tag "$prefix"
publishDir "${params.outdir}/STAR", mode: 'copy',
saveAs: {filename ->
if (filename.indexOf(".bam") == -1) "logs/$filename"
else if (!params.saveAlignedIntermediates && filename == "where_are_my_files.txt") filename
else if (params.saveAlignedIntermediates && filename != "where_are_my_files.txt") filename
else null
}
input:
file reads from trimmed_reads
file index from star_index.collect()
file gtf from gtf_star.collect()
file wherearemyfiles
output:
set file("*Log.final.out"), file ('*.bam') into star_aligned
file "*.out" into alignment_logs
file "*SJ.out.tab"
file "*Log.out" into star_log
file "where_are_my_files.txt"
script:
prefix = reads[0].toString() - ~/(_R1)?(_trimmed)?(_val_1)?(\.fq)?(\.fastq)?(\.gz)?$/
def avail_mem = task.memory == null ? '' : "--limitBAMsortRAM ${task.memory.toBytes() - 100000000}"
seqCenter = params.seqCenter ? "--outSAMattrRGline ID:$prefix 'CN:$params.seqCenter'" : ''
"""
STAR --genomeDir $index \\
--sjdbGTFfile $gtf \\
--readFilesIn $reads \\
--runThreadN ${task.cpus} \\
--twopassMode Basic \\
--outWigType bedGraph \\
--outSAMtype BAM SortedByCoordinate $avail_mem \\
--readFilesCommand zcat \\
--runDirPerm All_RWX \\
--outFileNamePrefix $prefix $seqCenter \\
"""
}
// Filter removes all 'aligned' channels that fail the check
star_aligned
.filter { logs, bams -> check_log(logs) }
.flatMap { logs, bams -> bams }
.into { bam_count; bam_rseqc; bam_preseq; bam_markduplicates; bam_featurecounts; bam_stringtieFPKM; bam_for_genebody }
}
/*
* STEP 3 - align with HISAT2
*/
if(params.aligner == 'hisat2'){
star_log = Channel.from(false)
process hisat2Align {
tag "$prefix"
publishDir "${params.outdir}/HISAT2", mode: 'copy',
saveAs: {filename ->
if (filename.indexOf(".hisat2_summary.txt") > 0) "logs/$filename"
else if (!params.saveAlignedIntermediates && filename == "where_are_my_files.txt") filename
else if (params.saveAlignedIntermediates && filename != "where_are_my_files.txt") filename
else null
}
input:
file reads from trimmed_reads
file hs2_indices from hs2_indices.collect()
file alignment_splicesites from alignment_splicesites.collect()
file wherearemyfiles
output:
file "${prefix}.bam" into hisat2_bam
file "${prefix}.hisat2_summary.txt" into alignment_logs
file "where_are_my_files.txt"
script:
index_base = hs2_indices[0].toString() - ~/.\d.ht2/
prefix = reads[0].toString() - ~/(_R1)?(_trimmed)?(_val_1)?(\.fq)?(\.fastq)?(\.gz)?$/
seqCenter = params.seqCenter ? "--rg-id ${prefix} --rg CN:${params.seqCenter.replaceAll('\\s','_')}" : ''
def rnastrandness = ''
if (forward_stranded && !unstranded){
rnastrandness = params.singleEnd ? '--rna-strandness F' : '--rna-strandness FR'
} else if (reverse_stranded && !unstranded){
rnastrandness = params.singleEnd ? '--rna-strandness R' : '--rna-strandness RF'
}
if (params.singleEnd) {
"""
hisat2 -x $index_base \\
-U $reads \\
$rnastrandness \\
--known-splicesite-infile $alignment_splicesites \\
-p ${task.cpus} \\
--met-stderr \\
--new-summary \\
--summary-file ${prefix}.hisat2_summary.txt $seqCenter \\
| samtools view -bS -F 4 -F 256 - > ${prefix}.bam
"""
} else {
"""
hisat2 -x $index_base \\
-1 ${reads[0]} \\
-2 ${reads[1]} \\
$rnastrandness \\
--known-splicesite-infile $alignment_splicesites \\
--no-mixed \\
--no-discordant \\
-p ${task.cpus} \\
--met-stderr \\
--new-summary \\
--summary-file ${prefix}.hisat2_summary.txt $seqCenter \\
| samtools view -bS -F 4 -F 8 -F 256 - > ${prefix}.bam
"""
}
}
process hisat2_sortOutput {
tag "${hisat2_bam.baseName}"
publishDir "${params.outdir}/HISAT2", mode: 'copy',
saveAs: { filename ->
if (!params.saveAlignedIntermediates && filename == "where_are_my_files.txt") filename
else if (params.saveAlignedIntermediates && filename != "where_are_my_files.txt") "aligned_sorted/$filename"
else null
}
input:
file hisat2_bam
file wherearemyfiles
output:
file "${hisat2_bam.baseName}.sorted.bam" into bam_count, bam_rseqc, bam_preseq, bam_markduplicates, bam_featurecounts, bam_stringtieFPKM, bam_for_genebody
file "where_are_my_files.txt"
script:
def avail_mem = task.memory == null ? '' : "-m ${task.memory.toBytes() / task.cpus}"
"""
samtools sort \\
$hisat2_bam \\
-@ ${task.cpus} $avail_mem \\
-o ${hisat2_bam.baseName}.sorted.bam
"""
}
}
/*
* STEP 4 - RSeQC analysis
*/
process rseqc {
tag "${bam_rseqc.baseName - '.sorted'}"
publishDir "${params.outdir}/rseqc" , mode: 'copy',
saveAs: {filename ->
if (filename.indexOf("bam_stat.txt") > 0) "bam_stat/$filename"
else if (filename.indexOf("infer_experiment.txt") > 0) "infer_experiment/$filename"
else if (filename.indexOf("read_distribution.txt") > 0) "read_distribution/$filename"
else if (filename.indexOf("read_duplication.DupRate_plot.pdf") > 0) "read_duplication/$filename"
else if (filename.indexOf("read_duplication.DupRate_plot.r") > 0) "read_duplication/rscripts/$filename"
else if (filename.indexOf("read_duplication.pos.DupRate.xls") > 0) "read_duplication/dup_pos/$filename"
else if (filename.indexOf("read_duplication.seq.DupRate.xls") > 0) "read_duplication/dup_seq/$filename"
else if (filename.indexOf("RPKM_saturation.eRPKM.xls") > 0) "RPKM_saturation/rpkm/$filename"
else if (filename.indexOf("RPKM_saturation.rawCount.xls") > 0) "RPKM_saturation/counts/$filename"
else if (filename.indexOf("RPKM_saturation.saturation.pdf") > 0) "RPKM_saturation/$filename"
else if (filename.indexOf("RPKM_saturation.saturation.r") > 0) "RPKM_saturation/rscripts/$filename"
else if (filename.indexOf("inner_distance.txt") > 0) "inner_distance/$filename"
else if (filename.indexOf("inner_distance_freq.txt") > 0) "inner_distance/data/$filename"
else if (filename.indexOf("inner_distance_plot.r") > 0) "inner_distance/rscripts/$filename"
else if (filename.indexOf("inner_distance_plot.pdf") > 0) "inner_distance/plots/$filename"
else if (filename.indexOf("junction_plot.r") > 0) "junction_annotation/rscripts/$filename"
else if (filename.indexOf("junction.xls") > 0) "junction_annotation/data/$filename"
else if (filename.indexOf("splice_events.pdf") > 0) "junction_annotation/events/$filename"
else if (filename.indexOf("splice_junction.pdf") > 0) "junction_annotation/junctions/$filename"
else if (filename.indexOf("junctionSaturation_plot.pdf") > 0) "junction_saturation/$filename"
else if (filename.indexOf("junctionSaturation_plot.r") > 0) "junction_saturation/rscripts/$filename"
else filename
}
when:
!params.skip_qc && !params.skip_rseqc
input:
file bam_rseqc
file bed12 from bed_rseqc.collect()
output:
file "*.{txt,pdf,r,xls}" into rseqc_results
script:
def strandRule = ''
if (forward_stranded && !unstranded){
strandRule = params.singleEnd ? '-d ++,--' : '-d 1++,1--,2+-,2-+'
} else if (reverse_stranded && !unstranded){
strandRule = params.singleEnd ? '-d +-,-+' : '-d 1+-,1-+,2++,2--'
}
"""
samtools index $bam_rseqc
infer_experiment.py -i $bam_rseqc -r $bed12 > ${bam_rseqc.baseName}.infer_experiment.txt
junction_annotation.py -i $bam_rseqc -o ${bam_rseqc.baseName}.rseqc -r $bed12
bam_stat.py -i $bam_rseqc 2> ${bam_rseqc.baseName}.bam_stat.txt
junction_saturation.py -i $bam_rseqc -o ${bam_rseqc.baseName}.rseqc -r $bed12 2> ${bam_rseqc.baseName}.junction_annotation_log.txt
inner_distance.py -i $bam_rseqc -o ${bam_rseqc.baseName}.rseqc -r $bed12
read_distribution.py -i $bam_rseqc -r $bed12 > ${bam_rseqc.baseName}.read_distribution.txt
read_duplication.py -i $bam_rseqc -o ${bam_rseqc.baseName}.read_duplication
"""
}
/*
* Step 4.1 Rseqc create BigWig coverage
*/
process createBigWig {
tag "${bam.baseName - 'sortedByCoord.out'}"
publishDir "${params.outdir}/bigwig", mode: 'copy'
when:
!params.skip_qc && !params.skip_genebody_coverage
input:
file bam from bam_for_genebody
output:
file "*.bigwig" into bigwig_for_genebody
script:
"""
samtools index $bam
bamCoverage -b $bam -p ${task.cpus} -o ${bam.baseName}.bigwig
"""
}
/*
* Step 4.2 Rseqc genebody_coverage
*/
process genebody_coverage {
tag "${bigwig.baseName}"
publishDir "${params.outdir}/rseqc" , mode: 'copy',
saveAs: {filename ->
if (filename.indexOf("geneBodyCoverage.curves.pdf") > 0) "geneBodyCoverage/$filename"
else if (filename.indexOf("geneBodyCoverage.r") > 0) "geneBodyCoverage/rscripts/$filename"
else if (filename.indexOf("geneBodyCoverage.txt") > 0) "geneBodyCoverage/data/$filename"
else if (filename.indexOf("log.txt") > -1) false
else filename
}
when:
!params.skip_qc && !params.skip_genebody_coverage
input:
file bigwig from bigwig_for_genebody
file bed12 from bed_genebody_coverage.collect()
output:
file "*.{txt,pdf,r}" into genebody_coverage_results
script:
"""
geneBody_coverage2.py \\
-i $bigwig \\
-o ${bigwig.baseName}.rseqc.txt \\
-r $bed12
"""
}
/*
* STEP 5 - preseq analysis
*/
process preseq {
tag "${bam_preseq.baseName - '.sorted'}"
publishDir "${params.outdir}/preseq", mode: 'copy'
when:
!params.skip_qc && !params.skip_preseq
input:
file bam_preseq
output:
file "${bam_preseq.baseName}.ccurve.txt" into preseq_results
script:
"""
preseq lc_extrap -v -B $bam_preseq -o ${bam_preseq.baseName}.ccurve.txt
"""
}
/*
* STEP 6 Mark duplicates
*/
process markDuplicates {
tag "${bam.baseName - '.sorted'}"
publishDir "${params.outdir}/markDuplicates", mode: 'copy',
saveAs: {filename -> filename.indexOf("_metrics.txt") > 0 ? "metrics/$filename" : "$filename"}
when:
!params.skip_qc && !params.skip_dupradar
input:
file bam from bam_markduplicates
output:
file "${bam.baseName}.markDups.bam" into bam_md
file "${bam.baseName}.markDups_metrics.txt" into picard_results
file "${bam.baseName}.markDups.bam.bai"
script:
if( task.memory == null ){
log.info "[Picard MarkDuplicates] Available memory not known - defaulting to 3GB. Specify process memory requirements to change this."
avail_mem = 3
} else {
avail_mem = task.memory.toGiga()
}
"""
picard -Xmx${avail_mem}g MarkDuplicates \\
INPUT=$bam \\
OUTPUT=${bam.baseName}.markDups.bam \\
METRICS_FILE=${bam.baseName}.markDups_metrics.txt \\
REMOVE_DUPLICATES=false \\
ASSUME_SORTED=true \\
PROGRAM_RECORD_ID='null' \\
VALIDATION_STRINGENCY=LENIENT
samtools index ${bam.baseName}.markDups.bam
"""
}
/*
* STEP 7 - dupRadar
*/
process dupradar {
tag "${bam_md.baseName - '.sorted.markDups'}"
publishDir "${params.outdir}/dupradar", mode: 'copy',
saveAs: {filename ->
if (filename.indexOf("_duprateExpDens.pdf") > 0) "scatter_plots/$filename"
else if (filename.indexOf("_duprateExpBoxplot.pdf") > 0) "box_plots/$filename"
else if (filename.indexOf("_expressionHist.pdf") > 0) "histograms/$filename"
else if (filename.indexOf("_dupMatrix.txt") > 0) "gene_data/$filename"
else if (filename.indexOf("_duprateExpDensCurve.txt") > 0) "scatter_curve_data/$filename"
else if (filename.indexOf("_intercept_slope.txt") > 0) "intercepts_slopes/$filename"
else "$filename"
}
when:
!params.skip_qc && !params.skip_dupradar
input:
file bam_md
file gtf from gtf_dupradar.collect()
output:
file "*.{pdf,txt}" into dupradar_results
script: // This script is bundled with the pipeline, in nfcore/rnaseq/bin/
def dupradar_direction = 0
if (forward_stranded && !unstranded) {
dupradar_direction = 1
} else if (reverse_stranded && !unstranded){
dupradar_direction = 2
}
def paired = params.singleEnd ? 'single' : 'paired'
"""
dupRadar.r $bam_md $gtf $dupradar_direction $paired ${task.cpus}
"""
}
/*
* STEP 8 Feature counts
*/
process featureCounts {
tag "${bam_featurecounts.baseName - '.sorted'}"
publishDir "${params.outdir}/featureCounts", mode: 'copy',
saveAs: {filename ->
if (filename.indexOf("biotype_counts") > 0) "biotype_counts/$filename"
else if (filename.indexOf("_gene.featureCounts.txt.summary") > 0) "gene_count_summaries/$filename"
else if (filename.indexOf("_gene.featureCounts.txt") > 0) "gene_counts/$filename"
else "$filename"
}
input:
file bam_featurecounts
file gtf from gtf_featureCounts.collect()
file biotypes_header
output:
file "${bam_featurecounts.baseName}_gene.featureCounts.txt" into geneCounts, featureCounts_to_merge
file "${bam_featurecounts.baseName}_gene.featureCounts.txt.summary" into featureCounts_logs
file "${bam_featurecounts.baseName}_biotype_counts*mqc.{txt,tsv}" into featureCounts_biotype
script:
def featureCounts_direction = 0
if (forward_stranded && !unstranded) {
featureCounts_direction = 1
} else if (reverse_stranded && !unstranded){
featureCounts_direction = 2
}
// Try to get real sample name
sample_name = bam_featurecounts.baseName - 'Aligned.sortedByCoord.out'
"""
featureCounts -a $gtf -g gene_id -o ${bam_featurecounts.baseName}_gene.featureCounts.txt -p -s $featureCounts_direction $bam_featurecounts
featureCounts -a $gtf -g gene_biotype -o ${bam_featurecounts.baseName}_biotype.featureCounts.txt -p -s $featureCounts_direction $bam_featurecounts
cut -f 1,7 ${bam_featurecounts.baseName}_biotype.featureCounts.txt | tail -n +3 | cat $biotypes_header - >> ${bam_featurecounts.baseName}_biotype_counts_mqc.txt
mqc_features_stat.py ${bam_featurecounts.baseName}_biotype_counts_mqc.txt -s $sample_name -f rRNA -o ${bam_featurecounts.baseName}_biotype_counts_gs_mqc.tsv
"""
}
/*
* STEP 9 - Merge featurecounts
*/
process merge_featureCounts {