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A new genome-wide association study on animals identifies genetic variants linked to cocaine addiction. This not only confirms some existing findings but also uncovers new ones. [4] One surprising new finding in the 2026 study is that there is a strong genetic link between susceptibility to cocaine addiction and genes that help regulate liver function and drug metabolism. [1] These findings contribute to the growing body of evidence that suggests genetics can play a significant role in vulnerability to cocaine addiction. [2][3]
Genetic mapping explained
There are several different ways to conduct genetic studies, but genome-wide association studies (GWAS) are considered some of the most comprehensive. Instead of exploring only a select number of genetic variants that could be linked to a particular disorder or trait, GWAS scans the entire genome to identify associated variants.
In addiction research, GWAS can be used to identify genetic factors that influence a person's risk of developing a substance use disorder, their response to drugs, or how they respond to treatment. Prior genetic studies have shown that addiction is polygenic, meaning it results from the combined effects of many genetic variants rather than just a single or select number of genes. [1][2][3]
Genetic mapping research has uncovered biological pathways involved in reward processing, impulse control, stress regulation, and drug metabolism, providing a more complete picture of the biological basis of addiction. GWAS are expected to improve scientists’ understanding of why some individuals are more susceptible to addiction, while also supporting the development of more individualized approaches to prevention and treatment. [1]
Study overview and key findings
The 2026 GWAS study was conducted on a large sample of 900 rats, who were allowed to self-administer cocaine under laboratory supervision. The rats were then observed, with researchers monitoring their initial and ongoing consumption levels, in addition to their consumption patterns when additional efforts were required to obtain the drug. The genetic traits of the rats with the highest, most frequent, and most compulsive patterns of cocaine use were then identified in an effort to gain insight into genetic variants associated with compulsive cocaine use.
The 2026 genome-wide association study was conducted to help identify genetic variants that increase a person’s susceptibility to cocaine use and addiction. The findings of this study contribute to an existing body of research that has helped scientists and researchers better understand the heritability of cocaine addiction. It is important to understand that, as an animal-based study, these findings have not been investigated in humans. While some potential correlations can be inferred, animal research is considered inferior to human research, and the findings should be validated in humans before making human-based conclusions.
Key genetic findings
Some of the findings of the 2026 GWAS were confirmatory, validating existing findings from past research, including support for a genetic link between cocaine addiction and genes involved in dopamine signaling, neuronal communication, learning, memory, and reward processing. Each of these genes involves different brain functions and processes that are known to be involved in addiction. [1][2][3]
One of the new and surprising findings of the study was a strong link between the susceptibility for cocaine addiction and a series of genes that play a key role in how the liver metabolizes cocaine. Specifically, the study found that genes that affect how quickly and efficiently the liver metabolizes cocaine are strongly associated with the risk for problem use and addiction to cocaine. [1] The gene FAM53B, in particular, was mapped. This gene functions in signaling by regulating certain proteins coming into the cell nucleus. The FAM53B gene is a risk gene, with links to susceptibility for substance abuse and addiction.
Because these genes affect the metabolism of cocaine by the liver, they also influence how strong and long-lasting the effects of cocaine are, which is highly individualized. These genetic variations can help to explain variable susceptibilities to cocaine addiction based on how strong and rewarding the effects are for each individual.
What the findings mean
Overall, the 2026 GWAS study on cocaine addiction risk found that the risk for cocaine addiction is multifactorial and polygenic in nature. Several interacting genetic variants can increase the individual risk for cocaine addiction, but are not sufficient to cause cocaine addiction.
Like all studies exploring the link between genetics and addiction, genetics is only one factor involved in the risk for addiction. Social and environmental factors, like peer groups, social support, socioeconomic stability, drug availability, stress, and previous trauma, also contribute substantially to the risk for addiction. These environmental risk factors can combine with genetic risk factors to influence a person’s individual susceptibility for addictive disorders. [2]
Existing research on genetic risks for cocaine addiction
The findings of the 2026 GWAS are added to a large body of existing data that suggests there is a strong genetic component to cocaine addiction. Existing research has shown that 40–70% of the risk for cocaine addiction is linked to genetic factors. [2][3]
Studies have consistently found that there is a polygenic risk for cocaine addiction, meaning that there is not one single gene that makes a person more susceptible. Instead, there are a number of different genes that can increase a person’s risk, especially when combined with other social and environmental risk factors. [2]
Genes associated with cocaine addiction
Many of the early studies examining genetic risks for cocaine addiction honed in on genes that were responsible for dopamine signaling. Dopamine is the brain’s “pleasure chemical”, and it is closely linked to the formation of addiction pathways in the brain. Dopamine signaling is also heavily involved in cocaine addiction, since cocaine is one of the most dopaminergic drugs (meaning it stimulates a large release of dopamine) and subsequently, also one of the most addictive drugs.
In addition to genes involved in dopamine production and signaling, the genetic risk for cocaine addiction is also believed to be linked to genes that are involved in learning, memory, and habit formation. For example, research has found that genes involved in glutamate signaling also can contribute to the risk for cocaine addiction, as these genes influence learning, memory, cravings, relapse, and neuroplasticity. [2]
Genes that are involved in the stress response have also been linked in existing studies to a higher risk for cocaine addiction. Specifically, genes that regulate the production of stress hormones (like cortisol and corticotropin-releasing hormone) have been implicated in people with a higher risk of cocaine addiction. [1][2] Existing research has also identified potential genetic risk factors for cocaine-induced paranoia, suggesting that genetic variation may influence how individuals respond to cocaine as well as their risk of developing addiction.
Final thoughts
New research continues to demonstrate a connection between genetics and addiction. The 2026 GWAS study that explored genetic variants linked to an increased risk for cocaine addiction demonstrated interesting findings. In addition to confirming some aspects of prior research, the study also found that genes regulating the liver's metabolism of cocaine may also influence the risk for addiction. [1]
These genes affect how quickly and efficiently cocaine is metabolized, which may translate into differences in the subjective effects of cocaine, how intense they are, and how long they last. This study suggests that individual differences in liver function and drug metabolism could help explain why cocaine is more rewarding, and therefore more addictive, for certain individuals.
The findings of this study are added to an existing body of research exploring the genetic risk factors for cocaine addiction and other substance use disorders. Collectively, this body of research suggests that genetic factors play a considerable role in addiction, and, when combined with environmental and social risk factors, they can greatly increase a person’s susceptibility to addiction. [2][3]
