Question: counting after aligning miRNA reads to miRBase mature miRNA instead of reference genome
3
gravatar for inah
2.9 years ago by
inah30
inah30 wrote:

I have human miRNA-seq data. In the past I have aligned these data using Bowtie2 to the reference genome (Homo_sapiens.GRCh38.dna.toplevel.fa), and I have subsequently performed counting using featureCounts with the annotation file hsa.gff3 from miRBase. . Now I have aligned the reads to the mature miRNA from miRBase (mature.fa), but when I look at the resulting bam files, the reads have a flag of 4 (segment unmapped) and there is no position information in mature.fa.

So can I use mature.fa as the reference for alignment and if so how is counting performed?

Thanks, Ina

mirna-seq • 1.6k views
ADD COMMENTlink modified 14 hours ago by kanika.151100 • written 2.9 years ago by inah30
1
gravatar for toralmanvar
2.8 years ago by
toralmanvar910
toralmanvar910 wrote:

yes, you can map the reads to mature miRNAs and can count the reads mapping onto it using samtools idxstat. Alternatively use can try using tool like mirdeep2 for complete analysis of miRNAs.

ADD COMMENTlink written 2.8 years ago by toralmanvar910
0
gravatar for kanika.151
14 hours ago by
kanika.151100
Italy
kanika.151100 wrote:

Pardon my ignorance but why cannot featureCounts pick up the counts from a bam file which has been aligned to mature.fa (downloaded from miRbase) ? Is there a specific thing that it looks for in the bam file?

ADD COMMENTlink written 14 hours ago by kanika.151100

I got the answer at this link: miRna-Seq, featureCounts problem

ADD REPLYlink written 10 hours ago by kanika.151100
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