Circulating cell-free DNA (cfDNA) fragment end motif profiles are a promising biomarker in precision oncology. Here, we present a protocol for analyzing plasma cfDNA fragment end motifs from ultra-low-pass whole-genome sequencing (WGS) data. We detail a pipeline composed of sequential bash scripts for processing post-alignment BAM files. Subsequently, we outline the procedure for downstream analysis and visualization of 4-mer as well as other n-mer cfDNA end motifs in R. For complete details on the use and execution of this protocol, please refer to Liu et al.1.
Keywords: Cancer; Genomics; Sequence analysis; Sequencing.
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