Adding multiple RG values in Bowtie2 when aligning with multiple fastq
I'm interested in keeping track of different sequence files as I go through a pipeline of mapping reads and calling variants.
I thought I might be able to add distinct read groups for each sequence file used to produce a bowtie2 alignment using something similar to this:
bowtie2 -q --very-sensitive -x RefGenome --rg-id first,second -rg PL:ILLUMINA,ILLUMINA -rg DS:NovaSeq,NovaSeq -rg PU:HFJ2WCCX2,HC3LCDSX2 -1 Seq1_R1.fq,Seq2_R1.fq -2 Seq1_R2.fq,Seq2_R2.fq
but checking with
samtools view -H Test_RG.bam and
samtools stats --split RG Test_RG.bam this just produces a single RG called "first,second" for the two sequence files.
Is there a way to assign a distinct read group per sequence file in a single bam file generated with bowtie2?
The bowtie2 manual entry for --rg-id and --rg doesn't explicitly say anything about multiple sequence files.
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