GT-Pro

GT-Pro performs ultra-rapid reference-based genotyping of prokaryotic single nucleotide polymorphisms (SNPs) in shotgun metagenomes to enable strain-level analyses of microbial populations such as the human gut microbiome.

Key Features:

• Ultra-Rapid SNP Calling: Employs exact k-mer matches for reference-based SNP calling, reported as two orders of magnitude faster than traditional read alignment while maintaining high accuracy.
• Input Formats: Accepts shotgun metagenomics sequencing libraries in FASTQ format.
• Allele-Level Read Counting and Output: Produces a table of counts of reads exactly matching each allele per SNP, with rows containing eight fields: species, SNP ID, contig, contig position, allele 1, allele 2, and coverage for both alleles.
• Extensive SNP Discovery: Catalogued over 104 million SNPs across 909 human gut species, enabling characterization of global population structure and strain tracking.

Scientific Applications:

• Microbial diversity and evolution: Enables analysis of genetic variation within prokaryotic communities for studies of microbial diversity and evolution.
• Population structure analysis: Facilitates characterization of population structure across species and samples using dense SNP catalogs.
• Genotype–phenotype association: Supports identification of genetic determinants linked to phenotypic variation by providing allele-level genotypes across metagenomes.
• Pathogen and strain monitoring: Enables tracking of pathogenic strains within complex microbiomes such as the human gut.

Methodology:

Catalogs SNPs from genomes using exact k-mer matches for reference-based SNP calling and counts reads exactly matching each allele, thereby bypassing traditional read alignment.