UMIc: A Preprocessing Method for UMI Deduplication and Reads Correction.

Frontiers in Genetics
Maria TsagiopoulouFotis Psomopoulos

Abstract

A recent refinement in high-throughput sequencing involves the incorporation of unique molecular identifiers (UMIs), which are random oligonucleotide barcodes, on the library preparation steps. A UMI adds a unique identity to different DNA/RNA input molecules through polymerase chain reaction (PCR) amplification, thus reducing bias of this step. Here, we propose an alignment free framework serving as a preprocessing step of fastq files, called UMIc, for deduplication and correction of reads building consensus sequences from each UMI. Our approach takes into account the frequency and the Phred quality of nucleotides and the distances between the UMIs and the actual sequences. We have tested the tool using different scenarios of UMI-tagged library data, having in mind the aspect of a wide application. UMIc is an open-source tool implemented in R and is freely available from https://github.com/BiodataAnalysisGroup/UMIc.

References

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Software Mentioned

UMIc
HISAT2
pRESTO
countsCutoff
Calib
bowtie
Picard
Je
zUMIs
Windows

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