Issue 16, 2016

Alarms about structural alerts


Structural alerts are widely accepted in chemical toxicology and regulatory decision support as a simple and transparent means to flag potential chemical hazards or group compounds into categories for read-across. However, there has been a growing concern that alerts disproportionally flag chemicals as toxic, which questions their reliability as toxicity markers. Conversely, rigorously developed and properly validated statistical QSAR models can accurately and reliably predict the toxicity of a chemical; however, their use in regulatory toxicology has been hampered by a lack of transparency and interpretability. We demonstrate that contrary to the common perception of QSAR models as “black boxes” they can be used to identify statistically significant chemical substructures (QSAR-based alerts) that influence toxicity. We show through several case studies, however, that the mere presence of structural alerts in a chemical, irrespective of the derivation method (expert-based or QSAR-based), should be perceived only as hypotheses of possible toxicological effect. We propose a new approach that synergistically integrates structural alerts and rigorously validated QSAR models for a more transparent and accurate safety assessment of new chemicals.

Graphical abstract: Alarms about structural alerts

Supplementary files

Article information

Article type
01 Jun 2016
28 Jun 2016
First published
28 Jun 2016

Green Chem., 2016,18, 4348-4360

Alarms about structural alerts

V. M. Alves, E. N. Muratov, S. J. Capuzzi, R. Politi, Y. Low, R. C. Braga, A. V. Zakharov, A. Sedykh, E. Mokshyna, S. Farag, C. H. Andrade, V. E. Kuz'min, D. Fourches and A. Tropsha, Green Chem., 2016, 18, 4348 DOI: 10.1039/C6GC01492E

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