LiBis: An ultrasensitive alignment method for low-input bisulfite sequencing

LiBis is a novel method for low-input WGBS data alignment. By dynamically clipping initially unmapped reads and remapping clipped fragments, we judiciously rescued those reads and uniquely aligned them to the genome. By substantially increasing the mapping ratio by up to 88%, LiBis improves the number of informative CpGs and the precision to quantify the methylation status of individual CpG sites. The high sensitivity and cost effectiveness afforded by LiBis for low-input samples will allow the discovery of genetic and epigenetic features suitable for downstream analysis and biomarker identification using liquid biopsy. Low input whole genome bisulfite sequencing.