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Related Concept Videos

Human Genetics01:28

Human Genetics

Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
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Depressive Disorders: Etiology01:27

Depressive Disorders: Etiology

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Diagnostic Criteria and Symptoms
To diagnose ADHD, symptoms must manifest before age 12 and be evident across multiple settings.
Depression: Overview01:18

Depression: Overview

Depression is a prevalent mental illness marked by persistent sadness and lack of interest in previously enjoyable activities. It can take several forms, including major depression, persistent depressive disorder, and bipolar I and II disorders. Symptoms range from emotional changes like chronic worry to physical changes like sleep disturbances and suicidal thoughts. From a neurobiological perspective, depression is believed to be triggered by abnormalities in the brain's prefrontal cortex,...
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Schizophrenia is a neurodevelopmental disorder whose origins are rooted in complex genetic components. Despite our burgeoning understanding, the pathophysiology of this disorder remains incompletely deciphered.
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Genetically determined dopamine availability predicts disposition for depression.

Andrea Felten, Christian Montag, Sebastian Markett

    Brain and Behavior
    |March 9, 2012
    PubMed
    Summary
    This summary is machine-generated.

    Genetic variations in dopamine genes influence personality traits. Specific dopamine transporter (DAT1) and catechol-O-methyltransferase (COMT) gene variants are linked to reduced sadness, suggesting a resilience factor against depression.

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    Area of Science:

    • Neuroscience
    • Behavioral Genetics
    • Psychology

    Background:

    • Personality theories often assume independence between positive emotionality (PEM) and negative emotionality (NEM), but empirical data suggest a negative correlation.
    • Dopaminergic (DA) gene loci have been previously associated with both PEM and NEM traits.

    Purpose of the Study:

    • To investigate the influence of two functional DA gene polymorphisms on Sadness.
    • To examine the interaction between dopamine transporter (DAT1) and catechol-O-methyltransferase (COMT) gene variants in relation to personality traits.

    Main Methods:

    • A genetic association study was conducted on 1041 healthy Caucasian individuals.
    • The study analyzed the interaction between the 10-repeat (10R) allele of the DAT1 gene and the methionine (Met) allele of the COMT Val158Met polymorphism.
    • Sadness was assessed using the Affective Neuroscience Personality Scales (ANPS).

    Main Results:

    • A significant interaction effect was observed between DAT1 and COMT gene polymorphisms on Sadness scores.
    • Individuals with the 9R/9R DAT1 genotype and Val/Val COMT genotype exhibited significantly lower Sadness scores.
    • These genotypes are associated with reduced dopamine transporter density and increased dopamine catabolism, respectively.

    Conclusions:

    • Gene variations in the dopaminergic system, previously linked to positive emotionality, may offer protection against negative emotionality.
    • Specific DAT1 and COMT genotypes appear to confer resilience against high negative emotionality and potentially depression.