AOPERA

AOPERA links chemicals and their characterized analogs to adverse outcome pathways (AOPs) by mapping substances to Molecular Initiating Events (MIEs), Key Events (KEs), and Adverse Outcomes (AOs) to support mechanistic toxicology analysis.

Key Features:

• Structured four-step mapping: Implements a four-step process that links chemicals directly to MIEs, KEs, or AOs; identifies analogs with established toxicological data; links the initial chemical or a characterized analog to MIEs/KEs/AOs; and identifies relevant AOPs containing these events.
• Resource library: Integrates databases and literature references relevant to AOP development and chemical-to-event linkage.
• AOP framework grounding and standardization: Applies the Adverse Outcome Pathway framework to standardize documentation and linkage of biological events from exposure to adverse outcomes.

Scientific Applications:

• Linking uncharacterized chemicals: Establishes mechanistic connections between uncharacterized chemicals and adverse health outcomes via MIEs, KEs, and AOs.
• AOP development and refinement: Supports toxicologists in expanding or refining existing AOPs by integrating new chemical or analog data.
• Environmental risk assessment: Assists environmental scientists in assessing potential risks of novel compounds by mapping mechanistic pathways.
• Regulatory safety assessment: Aids regulatory bodies and industry professionals in safety assessments and risk-management decisions by providing mechanistic linkage evidence.

Methodology:

The methodology is grounded in the Adverse Outcome Pathway framework and involves systematic identification and documentation of the sequence of biological events from exposure to adverse outcomes, utilization of existing data on characterized chemicals or analogs to infer potential effects of uncharacterized substances, and structured linkage of chemicals and analogs to MIEs, KEs, and AOs.