PICARD COLLECTGCBIASMETRICS¶
Run picard CollectGcBiasMetrics to generate QC metrics pertaining to GC bias.
URL:
Example¶
This wrapper can be used in the following way:
rule alignment_summary:
input:
# BAM aligned to reference genome
bam="mapped/a.bam",
# reference genome FASTA from which GC-context is inferred
ref="genome.fasta",
output:
metrics="results/a.gcmetrics.txt",
chart="results/a.gc.pdf",
summary="results/a.summary.txt",
params:
# optional additional parameters, for example,
extra="--MINIMUM_GENOME_FRACTION 1E-5",
log:
"logs/picard/a.gcmetrics.log",
# optional specification of memory usage of the JVM that snakemake will respect with global
# resource restrictions (https://snakemake.readthedocs.io/en/latest/snakefiles/rules.html#resources)
# and which can be used to request RAM during cluster job submission as `{resources.mem_mb}`:
# https://snakemake.readthedocs.io/en/latest/executing/cluster.html#job-properties
resources:
mem_mb=1024,
wrapper:
"v1.2.1/bio/picard/collectgcbiasmetrics"
Note that input, output and log file paths can be chosen freely.
When running with
snakemake --use-conda
the software dependencies will be automatically deployed into an isolated environment before execution.
Software dependencies¶
picard=2.26
snakemake-wrapper-utils==0.1.3
Input/Output¶
Input:
- BAM file of RNA-seq data aligned to genome
- REF_FLAT formatted file of transcriptome annotations
Output:
- GC metrics text file
- GC metrics PDF figure
- GC summary metrics text file
Notes¶
- The java_opts param allows for additional arguments to be passed to the java compiler, e.g. “-XX:ParallelGCThreads=10” (not for -XmX or -Djava.io.tmpdir, since they are handled automatically).
- The extra param allows for additional program arguments.
- –TMP_DIR is automatically set by resources.tmpdir
- For more information, see https://broadinstitute.github.io/picard/command-line-overview.html#CollectGcBiasMetrics
Authors¶
- Brett Copeland
Code¶
__author__ = "Brett Copeland"
__copyright__ = "Copyright 2021, Brett Copeland"
__email__ = "brcopeland@ucsd.edu"
__license__ = "MIT"
import tempfile
from snakemake.shell import shell
from snakemake_wrapper_utils.java import get_java_opts
log = snakemake.log_fmt_shell()
extra = snakemake.params.get("extra", "")
java_opts = get_java_opts(snakemake)
with tempfile.TemporaryDirectory() as tmpdir:
shell(
"picard CollectGcBiasMetrics"
" {java_opts} {extra}"
" --INPUT {snakemake.input.bam}"
" --TMP_DIR {tmpdir}"
" --OUTPUT {snakemake.output.metrics}"
" --CHART {snakemake.output.chart}"
" --SUMMARY_OUTPUT {snakemake.output.summary}"
" --REFERENCE_SEQUENCE {snakemake.input.ref}"
" {log}"
)