A serotonin receptor gene polymorphism (rs6311) was associated with different brain activation patterns in adolescents after psychosocial treatment for cannabis use disorders.
Read this if you are interested in how genetics might influence addiction treatment response.
Serotonin receptor gene variant linked to treatment-related brain changes
What the researchers found
This preliminary study examined whether genetic variations in the serotonin system moderated brain responses to psychosocial treatment for adolescent cannabis use disorders. Two serotonin gene polymorphisms were tested: a receptor variant (rs6311) and a transporter variant (rs2020936).
The original hypotheses were not supported. However, the rs6311 C allele was significantly associated with brain activation in the medial frontal gyrus and precuneus after treatment, suggesting this serotonin receptor variant plays a role in how adolescent brains respond to cannabis treatment.
These regions are involved in self-reflection and internal processing, suggesting the genetic variant may influence treatment-related changes in self-awareness and motivation.
Why it matters
If genetic variants predict treatment response, future cannabis treatment could be personalized based on individual biology. The serotonin system connection also explains why anxiety and depression commonly co-occur with cannabis use disorders.
The numbers in context
Two polymorphisms tested: rs6311 (serotonin receptor) and rs2020936 (transporter). rs6311 C allele associated with activation in medial frontal gyrus and precuneus.
How the study worked
fMRI study of adolescents with cannabis use disorders following psychosocial treatment. Participants were genotyped for serotonin receptor (rs6311) and transporter (rs2020936) polymorphisms. Brain activation patterns were compared across genotypes.
What this study cannot tell us
Preliminary study with small sample size. Original hypotheses were not supported. Single gene variant findings require replication. Could not determine whether the brain differences predicted actual treatment outcomes.
How to read the evidence
Preliminary fMRI pharmacogenomic study. Exploratory analysis after original hypotheses were unsupported. Requires replication in larger samples.
When this study was published
Published in 2012. Pharmacogenomics in addiction treatment remains an emerging field.
The bigger picture
Pharmacogenomics in addiction treatment is in its early stages. This study provided initial evidence that genetic factors might influence not just susceptibility to cannabis problems but also response to treatment.
Questions still open
- Does the rs6311 variant predict long-term treatment success? Would medications targeting the serotonin system enhance treatment for cannabis use disorders in carriers? Can pharmacogenomic testing guide treatment selection?
Common questions
Could genetic testing improve cannabis treatment?
Why would serotonin genes matter for cannabis treatment?
Read the original research
A preliminary examination of how serotonergic polymorphisms influence brain response following an adolescent cannabis intervention.
Psychiatry research, 204(2-3), 112-6
Citation
Feldstein Ewing, Sarah W; Mead, Hilary K; Yezhuvath, Uma; Dewitt, Sam; Hutchison, Kent E; Filbey, Francesca M. (2012). A preliminary examination of how serotonergic polymorphisms influence brain response following an adolescent cannabis intervention.. Psychiatry research, 204(2-3), 112-6. https://doi.org/10.1016/j.pscychresns.2012.10.011
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