Toxicology is one of the scientific disciplines that has most<br />evolved in recent years due to scientific and technological<br />advances that have created a deeper understanding of the<br />genetic and molecular basis for appreciative variability in<br />toxic response from one person to another. The application<br />of this knowledge in toxicology is known as toxicogenetics<br />and toxicogenomics. The latter is the discipline that studies<br />the genomic response of organisms exposed to chemical<br />agents, including drugs, environmental pollutants, food<br />additives, and other commonly used chemical products.<br />The use of emerging omic technologies, such as genomics,<br />transcriptomics, proteomics, metabolomics and bioinformatics<br />techniques, permits the analysis of many variants of genes<br />simultaneously in an organism exposed to toxic agents in order<br />to search for genes susceptible to damage, to detect patterns<br />and mechanisms of toxicity, and determine specific profiles<br />of gene expression that give origin to biomarkers of exposure<br />and risk. This constitutes predictive toxicology.