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Using Human Differentially Expressed Gene Lists to Perform Downstream Pathway Enrichment Analysis and Target Prioritization
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[Molecular Pathway and AOP Development Using Gene Network Analysis].

Shihori Tanabe1, Akihiko Hirose1, Maurice Whelan2

  • 1Division of Risk Assessment, Center for Biological Safety and Research, National Institute of Health Sciences.

Yakugaku Zasshi : Journal of the Pharmaceutical Society of Japan
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Summary
This summary is machine-generated.

The Organisation for Economic Co-operation and Development

Keywords:
Organisation for Economic Co-operation and Development (OECD)adverse effectadverse outcome pathway (AOP)gene molecular network pathway

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Area of Science:

  • Toxicology
  • Molecular Biology
  • Regulatory Science

Background:

  • The Organisation for Economic Co-operation and Development (OECD) established the Adverse Outcome Pathway (AOP) Development Program to evaluate chemical safety.
  • AOPs provide a framework for understanding toxicity pathways, linking molecular initiating events to adverse outcomes.
  • This program aims to support regulatory decision-making and build a comprehensive knowledge base of AOP case studies.

Purpose of the Study:

  • To introduce the OECD's AOP Development Program and its application in chemical safety assessment.
  • To detail the components of an AOP, including molecular initiating events (MIEs), key events (KEs), and adverse outcomes (AOs).
  • To present the current development status of specific AOPs, including one for histone deacetylase inhibition-induced testicular toxicity and another for Wnt signaling-related malignancies.

Main Methods:

  • Extraction of key events (KEs) across various biological levels (molecular, cellular, tissue, organ, individual, species).
  • Gathering data on key event relationships (KERs), including mechanisms, plausibility, species differences, and empirical support.
  • Utilizing gene expression network analysis for molecular pathway elucidation in suggested AOPs.

Main Results:

  • The OECD AOP Development Program is actively accumulating case studies to aid regulatory needs.
  • An AOP for histone deacetylase inhibition-induced testicular toxicity is under review by the OECD.
  • An AOP describing Wnt ligand stimulation and Wnt signaling activation-induced malignancies has been proposed.

Conclusions:

  • AOPs are a valuable tool for systematic toxicity pathway evaluation and regulatory science.
  • The development and application of AOPs are advancing, with specific examples progressing through review.
  • Further research and data accumulation are crucial for robust AOP development and validation.