Extremely-fast construction and querying of compacted and colored de Bruijn graphs with GGCAT
Compacted de Bruijn graphs are one of the most fundamental data structures in computational genomics. Colored compacted graphs Bruijn graphs are a variant built on a collection of sequences, and associate to each k-mer the sequences in which it appears. We present GGCAT, a tool for constructing both types of graphs, based on a new approach merging the k-mer counting step with the unitig construction step, and on numerous practical optimizations. For compacted de Bruijn graph construction, GGCAT achieves speed-ups of 3-21x compared to the state-of-the-art tool Cuttlefish 2 (Khan and Patro, Genome Biology, 2022). When constructing the colored variant, GGCAT achieves speed-ups of 5-39x compared to the state-of-the-art tool BiFrost (Holley and Melsted, Genome Biology, 2020). Additionally, GGCAT is up to 480x faster than BiFrost for batch sequence queries on colored graphs.