Difference between revisions of "Expression Analysis Pipeline"
From CoGepedia
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# [http://research-pub.gene.com/gmap/ GSNAP] is run to align the reads to the reference sequence (parameters: --nthreads=32 -n 5 --format=sam -Q --gmap-mode=none --nofails). | # [http://research-pub.gene.com/gmap/ GSNAP] is run to align the reads to the reference sequence (parameters: --nthreads=32 -n 5 --format=sam -Q --gmap-mode=none --nofails). | ||
# [http://samtools.sourceforge.net/ SAMtools] is run to compute per-position read depth of the resulting alignment (mpileup -D -Q 20). | # [http://samtools.sourceforge.net/ SAMtools] is run to compute per-position read depth of the resulting alignment (mpileup -D -Q 20). | ||
| − | # [http://cufflinks.cbcb.umd.edu/ Cufflinks] is run to compte per-transcript FPKM. | + | # [http://cufflinks.cbcb.umd.edu/ Cufflinks] is run to compte per-transcript FPKM (parameters: -p 24). |
# The three results (raw alignment, per-position read depth, and per-transcript FPKM) are loaded as separate [[Experiments]] into a [[Notebook]]. | # The three results (raw alignment, per-position read depth, and per-transcript FPKM) are loaded as separate [[Experiments]] into a [[Notebook]]. | ||
Revision as of 12:15, 27 February 2014
CoGe can generate gene/transcript expression measurements given a FASTQ input and an annotated genome.
When a FASTQ file of sequence reads is loaded in LoadExperiment and associated with an annotated genome, the following analysis steps are performed:
- The FASTQ file is verified for correct format.
- CutAdapt is run to trim adapter sequence from the reads (parameters: -q 25 --quality-base=64 -m 17).
- GMAP is run to index the reference genome sequence.
- GSNAP is run to align the reads to the reference sequence (parameters: --nthreads=32 -n 5 --format=sam -Q --gmap-mode=none --nofails).
- SAMtools is run to compute per-position read depth of the resulting alignment (mpileup -D -Q 20).
- Cufflinks is run to compte per-transcript FPKM (parameters: -p 24).
- The three results (raw alignment, per-position read depth, and per-transcript FPKM) are loaded as separate Experiments into a Notebook.
