Advancing substance use disorder biology by studying underlying gene x environment interactions

Area of Science:

• Neuroscience
• Genetics
• Pharmacology

Background:

• Substance use disorders (SUDs) are complex, heritable conditions influenced by genetic variants.
• These variants, often in noncoding regions, may alter gene expression, contributing to SUD risk.
• Drug exposure during critical neurodevelopmental windows (in utero, adolescence) significantly impacts brain development and SUD susceptibility.

Purpose of the Study:

• To review advances in understanding the molecular mechanisms of genetic risk in SUDs.
• To explore how genetic variants confer susceptibility to drug use, dependency, and specific substances.
• To address the challenges in human studies due to confounding genetic and environmental factors.

Main Methods:

• Review of key advances in animal models of SUDs.
• Analysis of human genetics and genomics research related to SUDs.
• Exploration of human stem cell models for studying SUDs.

Main Results:

• Genetic variants play a role in SUD heritability.
• Environmental exposures, particularly during neurodevelopment, are critical.
• Animal, human genetic, and stem cell models offer complementary approaches to disentangle gene-environment interactions.

Conclusions:

• Understanding genetic contributions to SUDs requires integrating data from diverse models.
• Resolving causal directions in SUD research is challenging but crucial for prevention and treatment.
• Future research should leverage multi-model approaches to elucidate SUD pathogenesis.