Application of the adverse outcome pathway framework to genotoxic modes of action. (31st October 2019)

• Record Type: Journal Article
• Authors: Sasaki, Jennifer C.; Allemang, Ashley; Bryce, Steven M.; Custer, Laura; Dearfield, Kerry L.; Dietz, Yasmin; Elhajouji, Azeddine; Escobar, Patricia A.; Fornace, Albert J.; Froetschl, Roland; Galloway, Sheila; Hemmann, Ulrike; Hendriks, Giel; Li, Heng‐Hong; Luijten, Mirjam; Ouedraogo, Gladys; Peel, Lauren; Pfuhler, Stefan; Roberts, Daniel J.; Thybaud, Véronique; van Benthem, Jan; Yauk, Carole L.; Schuler, Maik
• Other Names: Yauk Carole guestEditor.; DeMarini David guestEditor.; Heflich Robert guestEditor.
• Is Part Of: Environmental and molecular mutagenesis. Volume 61:Number 1(2020)
• Page Start: 114
• Page End: 134
• Publication Date: 2019-10-31
• Subjects: adverse outcome pathway -- mode of action -- genotoxicity; Mutagenesis -- Periodicals; Molecular genetics -- Periodicals; Mutagenèse -- Périodiques; Mutagenèse chimique -- Périodiques; Mutation -- Périodiques; Maladies de l'environnement -- Périodiques; Génétique moléculaire -- Périodiques; 576.542
• DOI: 10.1002/em.22339
• Languages: English
• ISSNs: 0893-6692

Abstract

Abstract : In May 2017, the Health and Environmental Sciences Institute's Genetic Toxicology Technical Committee hosted a workshop to discuss whether mode of action (MOA) investigation is enhanced through the application of the adverse outcome pathway (AOP) framework. As AOPs are a relatively new approach in genetic toxicology, this report describes how AOPs could be harnessed to advance MOA analysis of genotoxicity pathways using five example case studies. Each of these genetic toxicology AOPs proposed for further development includes the relevant molecular initiating events, key events, and adverse outcomes (AOs), identification and/or further development of the appropriate assays to link an agent to these events, and discussion regarding the biological plausibility of the proposed AOP. A key difference between these proposed genetic toxicology AOPs versus traditional AOPs is that the AO is a genetic toxicology endpoint of potential significance in risk characterization, in contrast to an adverse state of an organism or a population. The first two detailed case studies describe provisional AOPs for aurora kinase inhibition and tubulin binding, leading to the common AO of aneuploidy. The remaining three case studies highlight provisional AOPs that lead to chromosome breakage or mutation via indirect DNA interaction (inhibition of topoisomerase II, production of cellular reactive oxygen species, and inhibition of DNA synthesis). These case studies serve as starting points for genotoxicity AOPs that could ultimately be published and utilized by the broader toxicology community and illustrate the practical considerations and evidence required to formalize such AOPs so that they may be applied to genetic toxicity evaluation schemes. Environ. Mol. Mutagen. 61:114–134, 2020. © 2019 Wiley Periodicals, Inc.