Question: Is rsburead splice-aware? Should I use HISAT2, rsubread, or some other aligner?
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gravatar for rezaeir75
24 days ago by
rezaeir7510
rezaeir7510 wrote:
  • I'm currently learning different approaches for RNA-seq data QC, alignment, and analysis. However, I'm confused that which tool is best for alignment. Because I'm comfortable with R, I'd rather stay in R environment and use Rsubread but I want to be sure that I'm not sacrificing accuracy for ease.
  • What do you think about Rsubread? How does it compare to other tools considering speed and accuracy? Is it splice-aware? How does it compare to HISAT2?
rna-seq alignment R • 110 views
ADD COMMENTlink modified 10 days ago by kristoffer.vittingseerup3.3k • written 24 days ago by rezaeir7510

What is the end goal of your RNAseq analysis? The answer probably depends on that :-)

ADD REPLYlink written 20 days ago by kristoffer.vittingseerup3.3k

my primary objective is to find differentially expressed genes in tumor cells before and after treatment. but I also want to search for miRNA-mRNA regulatory networks as a secondary goal.

ADD REPLYlink written 20 days ago by rezaeir7510
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gravatar for kristoffer.vittingseerup
10 days ago by
European Union
kristoffer.vittingseerup3.3k wrote:

I wrote something about quantification considerations in the vignette of my R package IsoformSwitchAnalyzeR which might be relevant. TL;DR: you probably need to venture outside of R but those tools are really easy to use :-)

ADD COMMENTlink written 10 days ago by kristoffer.vittingseerup3.3k

Thank you for your answer. I finally went with kallisto and pseudo-alignment approach. I'm learning to use your package for DTU. However, there is a problem. Maybe this is not the right place and I should ask another question. But anyway, the problem is that when I run importRdata() with the following arguments:

mySwitchList <- importRdata(
  isoformCountMatrix   = Txi_trans$counts,
  isoformRepExpression = Txi_trans$abundance,
  designMatrix         = targets.mod,
  removeNonConvensionalChr = TRUE,
  addAnnotatedORFs=TRUE,
  isoformExonAnnoation = "Homo_sapiens.GRCh38.100.chr_patch_hapl_scaff.gtf.gz",
  isoformNtFasta       = "Homo_sapiens.GRCh38.cdna.all.fa.gz",
  showProgress = TRUE
)

it gives me this error that:

Step 1 of 6: Checking data...
Step 2 of 6: Obtaining annotation...
    importing GTF (this may take a while)
Error in importRdata(isoformCountMatrix = Txi_trans$counts, isoformRepExpression = Txi_trans$abundance,  : 
  The annotation and quantification (count/abundance matrix and isoform annotation) seems to be different (Jaccard similarity < 0.925). 
Either isforoms found in the annotation are not quantifed or vise versa. 
Specifically:
 172247 isoforms were quantified.
 226798 isoforms are annotated.
 Only 170828 overlap.
 1419 isoforms quantifed isoforms had no corresponding annoation

This combination cannot be analyzed since it will cause discrepencies between quantification and annotation thereby skewing all analysis.

based on the rest of this output and its recommendation to use ignoreAfterPeriod, I adjusted my code and I got the same output except the line:

 1419 isoforms quantifed isoforms had no corresponding annoation

became

 214 isoforms quantifed isoforms had no corresponding annoation

so, my question is, how should I fix this issue? Thank you for your help and this awesome package.

ADD REPLYlink modified 4 days ago • written 4 days ago by rezaeir7510

Kallisto sounds like a good approach. With regards to IsoformSwitchAnalyzeR It is not appropriate to ask a new question as a comment (since it makes it very hard for other people to find/navigate the info/solutions). Either ask it as a new question here on biostars or in the IsoformSwitchAnalyzeR google group (where you can also look if other people have had this problem).

ADD REPLYlink written 11 hours ago by kristoffer.vittingseerup3.3k
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