vcf2maf module with built in VEP (#1768)

vcf2maf module created

Additions:
 - vcf2maf module created
 - If VEP is present in PATH, it is added to command
 - If VEP is missing, it is ignored (recommended to skip with --inhibit-vep)
 - VEP version automatically added to versions.yml
 - Uses VEP cache during testing which is added to test-datasets in https://github.com/nf-core/test-datasets/pull/563
 - Default Docker image includes VEP and vcf2maf
 - Test includes without VEP.

Relates to #490

modules/vcf2maf/main.nf

@@ -0,0 +1,55 @@
+def VERSION = '1.6.21'
+
+process VCF2MAF {
+
+    tag "$meta.id"
+    label 'process_low'
+
+    conda (params.enable_conda ? "bioconda::vcf2maf=1.6.21 bioconda::ensembl-vep=106.1" : null)
+    container "${ workflow.containerEngine == 'singularity' && !task.ext.singularity_pull_docker_container ?
+        'https://depot.galaxyproject.org/singularity/mulled-v2-b6fc09bed47d0dc4d8384ce9e04af5806f2cc91b:305092c6f8420acd17377d2cc8b96e1c3ccb7d26-0':
+        'quay.io/biocontainers/mulled-v2-b6fc09bed47d0dc4d8384ce9e04af5806f2cc91b:305092c6f8420acd17377d2cc8b96e1c3ccb7d26-0' }"
+
+    input:
+    tuple val(meta), path(vcf) // Use an uncompressed VCF file!
+    path fasta                 // Required
+    path vep_cache             // Required for VEP running. A default of /.vep is supplied.
+
+    output:
+    tuple val(meta), path("*.maf"), emit: maf
+    path "versions.yml"           , emit: versions
+
+    when:
+    task.ext.when == null || task.ext.when
+
+    script:
+    def args          = task.ext.args   ?: ''
+    def prefix        = task.ext.prefix ?: "${meta.id}"
+    def vep_cache_cmd = vep_cache       ? "--vep-data $vep_cache" : ""
+
+    // If VEP is present, it will find it and add it to commands.
+    // If VEP is not present they will be blank
+    """
+    if command -v vep &> /dev/null
+    then
+        VEP_CMD="--vep-path \$(dirname \$(type -p vep))"
+        VEP_VERSION=\$(echo -e "\\n    ensemblvep: \$( echo \$(vep --help 2>&1) | sed 's/^.*Versions:.*ensembl-vep : //;s/ .*\$//')")
+    else
+        VEP_CMD=""
+        VEP_VERSION=""
+    fi
+
+    vcf2maf.pl \\
+        $args \\
+        \$VEP_CMD \\
+        $vep_cache_cmd \\
+        --ref-fasta $fasta \\
+        --input-vcf $vcf \\
+        --output-maf ${prefix}.maf
+
+    cat <<-END_VERSIONS > versions.yml
+    "${task.process}":
+        vcf2maf: $VERSION\$VEP_VERSION
+    END_VERSIONS
+    """
+}

modules/vcf2maf/meta.yml

@@ -0,0 +1,47 @@
+name: "vcf2maf"
+description: vcf2maf
+keywords:
+  - "vcf2maf"
+  - annotation
+tools:
+  - "vcf2maf":
+      description: |
+        "Convert a VCF into a MAF where each variant is annotated to only one of all possible gene isoforms using vcf2maf. vcf2maf is designed to work with VEP, so it is recommended to have VEP and vcf2maf installed when running this module. Running VEP requires a VEP cache to be present. It is recommended to set the --species and --ncbi-build in ext.args (use the module config). If you wish to skip VEP, add `--inhibit-vep` to ext.args. It may also be necessary to set --tumor-id and --normal-id for correct parsing of the VCF."
+      homepage: "https://github.com/mskcc/vcf2maf"
+      documentation: "https://github.com/mskcc/vcf2maf"
+      tool_dev_url: "https://github.com/mskcc/vcf2maf"
+      doi: "10.5281/zenodo.593251"
+      licence: "['Apache-2.0']"
+
+input:
+  - meta:
+      type: map
+      description: |
+        Groovy Map containing sample information
+        e.g. [ id:'test', single_end:false ]
+  - vcf:
+      type: file
+      description: |
+        vcf to convert to MAF format. Must be uncompressed.
+  - vep_cache:
+      type: file
+      description: |
+        Path to VEP cache dir. Required for correct running of VEP.
+
+output:
+  - meta:
+      type: map
+      description: |
+        Groovy Map containing sample information
+        e.g. [ id:'test', single_end:false ]
+  - maf:
+      type: file
+      description: MAF file produced from VCF
+      pattern: "*.maf"
+  - versions:
+      type: file
+      description: File containing software versions
+      pattern: "versions.yml"
+
+authors:
+  - "@adamrtalbot"

tests/config/pytest_modules.yml

@@ -2144,6 +2144,10 @@ vcf2db:
   - modules/vcf2db/**
   - tests/modules/vcf2db/**
 
+vcf2maf:
+  - modules/vcf2maf/**
+  - tests/modules/vcf2maf/**
+
 vcfanno:
   - modules/vcfanno/**
   - tests/modules/vcfanno/**

tests/config/test_data.config

@@ -186,6 +186,8 @@ params {
 
                 vcfanno_tar_gz                                 = "${test_data_dir}/genomics/homo_sapiens/genome/vcf/vcfanno/vcfanno_grch38_module_test.tar.gz"
                 vcfanno_toml                                   = "${test_data_dir}/genomics/homo_sapiens/genome/vcf/vcfanno/vcfanno.toml"
+
+                vep_cache                                      = "${test_data_dir}/genomics/homo_sapiens/genome/vep.tar.gz"
             }
             'pangenome' {
                 pangenome_fa                                   = "${test_data_dir}/pangenomics/homo_sapiens/pangenome.fa"

tests/modules/vcf2maf/main.nf

@@ -0,0 +1,30 @@
+#!/usr/bin/env nextflow
+
+nextflow.enable.dsl = 2
+
+include { VCF2MAF } from '../../../modules/vcf2maf/main.nf'
+include { UNTAR   } from '../../../modules/untar/main.nf'
+
+workflow test_vcf2maf_no_vep {
+
+    input_vcf = [
+        [ id:'test' ],
+        file(params.test_data['homo_sapiens']['illumina']['test_genome_vcf'], checkIfExists: true)
+    ]
+    fasta = [ file(params.test_data['homo_sapiens']['genome']['genome_fasta'], checkIfExists: true) ]
+
+    VCF2MAF ( input_vcf, fasta, [] )
+}
+
+workflow test_vcf2maf_vep {
+
+    input_vcf = [
+        [ id:'test' ],
+        file(params.test_data['homo_sapiens']['illumina']['test_genome_vcf'], checkIfExists: true)
+    ]
+    fasta     = [ file(params.test_data['homo_sapiens']['genome']['genome_fasta'], checkIfExists: true) ]
+    vep_cache = [ [ id:'test' ], file(params.test_data['homo_sapiens']['genome']['vep_cache'], checkIfExists: true) ]
+
+    vep_cache_unpacked = UNTAR(vep_cache).untar.map { it[1] }
+    VCF2MAF ( input_vcf, fasta, vep_cache_unpacked)
+}

tests/modules/vcf2maf/nextflow.config

@@ -0,0 +1,14 @@
+params.species = "homo_sapiens"
+params.build   = "GRCh38"
+
+process {
+
+    publishDir = { "${params.outdir}/${task.process.tokenize(':')[-1].tokenize('_')[0].toLowerCase()}" }
+    withName: 'test_vcf2maf_no_vep:VCF2MAF' {
+        ext.args = "--ncbi-build ${params.build} --species ${params.species} --inhibit-vep"
+        container = "quay.io/biocontainers/vcf2maf:1.6.21--hdfd78af_0"
+    }
+    withName: 'test_vcf2maf_vep:VCF2MAF' {
+        ext.args = "--ncbi-build ${params.build} --species ${params.species}"
+    }
+}

tests/modules/vcf2maf/test.yml

@@ -0,0 +1,15 @@
+- name: vcf2maf test_vcf2maf_no_vep
+  command: nextflow run ./tests/modules/vcf2maf -entry test_vcf2maf_no_vep -c ./tests/config/nextflow.config  -c ./tests/modules/vcf2maf/nextflow.config
+  tags:
+    - vcf2maf
+  files:
+    - path: output/vcf2maf/test.maf
+      md5sum: c7f357efa774fd5c4003d84f05212ed0
+
+- name: vcf2maf test_vcf2maf_vep
+  command: nextflow run ./tests/modules/vcf2maf -entry test_vcf2maf_vep -c ./tests/config/nextflow.config  -c ./tests/modules/vcf2maf/nextflow.config
+  tags:
+    - vcf2maf
+  files:
+    - path: output/vcf2maf/test.maf
+      md5sum: bf114692a2f421225926c9b651eff161