title: Approaches for externally validated QSAR modelling of Nitrated Polycyclic Aromatic Hydrocarbon mutagenicity.
abstract: Nitrated Polycyclic Aromatic Hydrocarbons (nitro-PAHs), ubiquitous environmental pollutants, are recognized mutagens and carcinogens. A set of mutagenicity data (TA100) for 48 nitro-PAHs was modeled by the Quantitative Structure-Activity Relationships (QSAR) regression method, and OECD principles for QSAR model validation were applied. The proposed Multiple Linear Regression (MLR) models are based on two topological molecular descriptors. The models were validated for predictivity by both internal and external validation. For the external validation, three different splitting approaches, D-optimal Experimental Design, Self Organizing Maps (SOM) and Random Selection by activity sampling, were applied to the original data set in order to compare these methodologies and to select the best descriptors able to model each prediction set chemicals independently of the splitting method applied. The applicability domain was verified by the leverage approach.
authors: QSAR Research Unit in Environmental Chemistry and Ecotoxicology, Department of Structural and Functional Biology, University of Insubria, via Dunant 3, 21100 Varese, Italy. paola.gramatica@uninsubria.it
authors: P
authors: P
authors: Gramatica
authors: P
authors: P
authors: Pilutti
authors: E
authors: E
authors: Papa
mesh_terms: D016014:Linear Models; D008956:Models, Chemical; D009152:Mutagenicity Tests / Q000379:methods; D009153:Mutagens / Q000737:chemistry / Q000633:toxicity*; D009574:Nitro Compounds / Q000737:chemistry / Q000633:toxicity*; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry / Q000633:toxicity*; D021281:Quantitative Structure-Activity Relationship
chemical_list: D009153:Mutagens; D009574:Nitro Compounds; D011084:Polycyclic Aromatic Hydrocarbons