AgrVATE

AgrVATE identifies and analyzes the accessory gene regulator (agr) locus in Staphylococcus aureus to classify agr specificity groups, detect variants and frameshift mutations within the agrBDCAI operon, and enable large-scale genomic surveys of agr operon variation.

Key Features:

• Rapid Identification: Determines agr locus type among the four specificity groups based on distinct autoinducer peptide sequences encoded by the agrD gene.
• Variant Detection: Detects sequence variants and frameshift mutations within the agr operon comprising five genes (agrBDCAI) that are critical for quorum sensing (QS) regulation.
• Genomic Survey Capability: Supports species-wide analyses, demonstrated on a dataset of over 40,000 Staphylococcus aureus genomes, to map distribution and evolution of agr types across clonal complexes.
• Mutation Analysis: Identifies frameshift mutations within the operon and reports their prevalence (over 5% in the surveyed genomes) and evolutionary patterns, including convergent evolution without long-term phylogenetic transmission.

Scientific Applications:

• Virulence Regulation Studies: Enables analysis of agr locus types and associated mutations to study how S. aureus modulates virulence factor expression via the QS system.
• Epidemiological Insights: Links agr types with clonal complexes to inform studies of pathogen population structure and evolutionary dynamics.
• Clinical Implications: Identifies nonfunctional agr systems, which are often associated with chronic infections and increased disease severity, to support clinical research on infection outcomes.

Methodology:

AgrVATE applies algorithmic typing of the agr system and detection of frameshift mutations on genomic sequences drawn from public databases to enable comprehensive species-wide surveys.