COMBINE-lab / salmon

🐟 🍣 🍱 Highly-accurate & wicked fast transcript-level quantification from RNA-seq reads using selective alignment
https://combine-lab.github.io/salmon
GNU General Public License v3.0
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Only 50% reads aligned on PE human mRNA stranded library #905

Open cecile2429 opened 10 months ago

cecile2429 commented 10 months ago

Hello, We have fastq files from an Illumina stranded human mRNA library (QC ok), sequenced on novaseq X in paired end (QC ok). But when we align with salmon, we only have 50% of reads aligned. Illumina certifies that they manage to align them with their tools at 72%, but we cannot reproduce with salmon1.10.2 installed with bioconda. We used the code: salmon quant -i human_index -l ISR -1 Fastq/R1 -2 Fastq/R2 -p 8 --validateMappings -o SALMON_OUT

If anyone can help us increase this alignment %. Thank you for your help. Cecile