LueVari

Luevari calls single-nucleotide polymorphisms (SNPs) directly from metagenomic sequencing data without requiring reference genomes to enable variant detection in complex microbial communities.

Key Features:

• Reference-Free SNP Calling: Detects SNPs in metagenomic samples without using reference genomes.
• Read-Colored De Bruijn Graphs: Constructs and traverses read-colored de Bruijn graphs to coherently follow reads and resolve repeats longer than the k-mer length and shorter than the read length.
• High Sensitivity and Precision: Reported sensitivity ranges from 91% to 99% and precision ranges from 71% to 99%.
• AMR Genes and Chromosomal DNA: Identifies SNPs within antimicrobial resistance (AMR) genes as well as chromosomal DNA.
• Sequence Construction with Variations: Builds sequences that incorporate detected variations, covering up to 97.8% of genes in datasets to aid detection of distinct AMR genes.

Scientific Applications:

• Metagenome variant profiling: Enables SNP-based characterization of genetic variation within complex microbial communities.
• Resistome analysis: Supports identification and comparative analysis of SNPs in AMR genes across samples.
• SNP-based fingerprinting and tracking: Facilitates tracing of specific organisms and genes across samples to study movement and evolution of AMR-associated variants.

Methodology:

Constructs and traverses read-colored de Bruijn graphs to identify SNPs, resolve repeats longer than k-mers and shorter than reads, and assemble sequences that include detected variations.