Tox21Enricher

Tox21Enricher performs enrichment analysis of chemical sets to identify toxicological, mechanistic, and chemical annotations for hypothesis generation.

Key Features:

• Input identifier support: Accepts InChI strings, CASRN (Chemical Abstracts Service Registry Numbers), and SMILES identifiers as input.
• Reactive chemical filtering: Automatically detects and excludes chemicals containing reactive functional groups such as nitrile, aldehyde, epoxide, and isocyanate from analyses.
• Annotation detection: Identifies overrepresented annotations including receptor binding activities, carcinogenicity, and toxicologically relevant chemical substructures.
• Tox21 screening integration: Analyzes sets of compounds screened using the Tox21 platform to derive enriched annotations.
• Visualization outputs: Generates data visualization outputs to summarize enrichment results.
• Database backend: Uses Postgres for database management and querying of annotation data.

Scientific Applications:

• Mechanistic annotation: Infers mechanistic properties of chemicals by identifying enriched biological and chemical annotations.
• Toxicological hypothesis generation: Supports generation of hypotheses about potential toxicological effects of untested chemicals based on enriched annotations and structural or biological similarities to known substances.

Methodology:

Identifies overrepresented annotations such as receptor binding activities, carcinogenicity, and toxicologically relevant chemical substructures within input chemical sets and excludes chemicals with reactive functional groups (nitrile, aldehyde, epoxide, isocyanate); stores and queries annotation data using Postgres.