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The purpose of the NIDA Animal Genetics Program is to identify genetic, genomic, and molecular (epi)genetic variants that underlie phenotypes associated with addictive behaviors and/or vulnerability to distinct stages along the substance use disorders (SUD) trajectory. This includes examining initial/acute use, escalation of use, acquisition of tolerance, dependence, uncontrolled use, abstinence and relapse or recovery. Applications may examine behaviors associated with SUD such as impulsivity, novelty seeking, and delayed discounting, as well as comorbidities demonstrating genetic correlations with phenotypes and behaviors linked with SUD including anxiety, stress, poor maternal care, and social defeat. NIDA encourages applications that take genomics, multi-omics, and/or data-based approaches that integrate multi-level omics data, delineate gene networks, and/or uncover the function of known or newly discovered genetic or epigenetic variants. Other areas of interest include genomics analysis at the circuit level and the application of neuroscience to genomics studies. NIDA expects these studies to uncover novel mechanisms that contribute to various stages across the SUD trajectory and inform future studies about potential targets and therapeutic strategies for addiction.