Genetic Variations Affect Dopamine Transporter Levels in the Brain
Author Information
Author(s): Shumay Elena, Chen John, Fowler Joanna S., Volkow Nora D.
Primary Institution: Brookhaven National Laboratory
Hypothesis
The genetic variations in the SLC6A3 gene may differentially affect dopamine transporter (DAT) density in the brain, influenced by age and ancestry.
Conclusion
Both the 3′-UTR and intron8 polymorphisms of the SLC6A3 gene are significantly associated with striatal DAT density, and these associations are influenced by age and ethnic background.
Supporting Evidence
- Both 3′-UTR and intron8 polymorphisms were significantly associated with DAT density.
- Age-related changes in DAT availability differed among genotype groups.
- Ethnic background influenced the strength of genotype-DAT associations.
Takeaway
This study found that certain genes can change how much dopamine transporter is available in the brain, and this can be different based on a person's age and background.
Methodology
The study used positron emission tomography (PET) imaging to measure DAT availability in healthy participants and analyzed genetic samples for SLC6A3 polymorphisms.
Potential Biases
Potential bias due to self-assigned ethnicity and the exclusion of rare alleles from the analysis.
Limitations
The study's sample was limited to healthy individuals, and the findings may not be generalizable to populations with neurological disorders; also, the sample size for some genotype groups was small.
Participant Demographics
The sample included 95 healthy adults, with 38% African-American, 56% Caucasian, and 11% from other ethnic backgrounds.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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