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Eligibility:
Design:
Full description
Objective:
Functional genetic polymorphisms have been identified that influence the morphology and function of brain regions that have been implicated in addictive and neuropsychiatric disorders. This protocol aims to integrate genotyping with both structural and functional brain imaging to investigate the impact of specific functional polymorphisms on morphology and function of the amygdala and the hippocampus and on behavior mediated by these brain regions. Functional polymorphisms of the BDNF, SLC6A4, and DISC1 genes will be studied, as these are logical candidates to influence variability in brain morphology and function. The overall hypothesis is that variation in morphology and function of the amygdala and the hippocampus is explained, at least in part, by specific genotype differences.
Study Population:
The study population will consist of healthy male and female adult volunteers (18-50 years old).
Design:
After being medically cleared and giving written informed consent, each participant will undergo a structural MRI scan of the brain to be used for volumetric measurements of the amygdala, hippocampus, prefrontal cortex, and intracranial cavity. Each participant will undergo an fMRI scanning session, which will include an emotional context memory task specifically designed to require functioning of the amygdala and the hippocampus. A venous blood sample will be collected for genotyping of BDNF, SLC6A4, and DISC1 polymorphisms. Additionally, other functional polymorphisms that may influence brain structure may also be evaluated, in exploratory fashion. If participants have already had a blood sample collected for the genetics portion of another Neuroimaging Research Branch study, they may not need to have another sample taken.
Outcome Measures:
This protocol will provide no direct benefits to research participants. Understanding the relationship between genetic polymorphisms and brain morphology and their association to brain function and behavior may provide further clues to the neurobiological mechanisms underlying addictive and neuropsychiatric disorders. The potential risks are related to acquiring MRI scans in general. Medical supervision will be provided throughout the study.
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Inclusion and exclusion criteria
To be eligible for this study, subjects must:
EXCLUSION CRITERIA:
Subjects will be excluded if they:
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Data sourced from clinicaltrials.gov
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