Hello,

The package FlipFlop is made for isoform quantitiation. Why are there no 
options to specify the RNA-seq read strand ? Otherwise, the method produces 
incorrect counts where overlapping genes on both strands are being transcribed. 
Also, the software requires a SAM file as input. This is inefficient, since 
most mapping results are stored as BAM files. It would be better if FlipFlop 
made more use of the import and export functions available in Rsamtools. Also, 
requiring the gene database to be in BED12 format creates more unnecessary work 
for the user. ENSEMBL and GENCODE both provide GTF and GFF3 files, which can 
easily be imported into R with functions provided by rtracklayer.

--------------------------------------
Dario Strbenac
University of Sydney
Camperdown NSW 2050
Australia

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