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Related Concept Videos

Human Genetics01:28

Human Genetics

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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.
The complex relationship between genetics and psychology is observable through common biological components such...
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Pharmacogenetics of Drug Transporters: P-Glycoprotein and Solute Carrier Transporters01:16

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The pharmacogenetics of drug transporters is increasingly recognized as a critical factor influencing interindividual variability in drug absorption, distribution, and elimination. These membrane-bound proteins regulate drugs' movement across cellular barriers by actively pumping them out (efflux) or facilitating their uptake (influx). Among the major transporter families, ATP-binding cassette (ABC) and solute carrier (SLC) transporters play particularly prominent roles. Genetic polymorphisms...
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Regulated mRNA Transport02:22

Regulated mRNA Transport

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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
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Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase01:11

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Genetic polymorphisms in drug targets have emerged as critical determinants of interindividual variability in drug response and toxicity. Pharmacogenomic investigations increasingly focus on identifying these variations to personalize and optimize therapeutic interventions. A drug target may be a receptor, enzyme, or signaling protein involved in pharmacologic responses or disease-related pathways. While early pharmacogenetic studies focused primarily on drug metabolism, current research...
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The Significance of Membrane Transport01:44

The Significance of Membrane Transport

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The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
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Drugs Affecting Neurotransmitter Release or Uptake01:21

Drugs Affecting Neurotransmitter Release or Uptake

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Certain drugs can affect how neurotransmitters called catecholamines, are released or taken back up in the adrenergic neuron. They can have different effects on the body's sympathetic transmission. Reserpine, a natural compound found in the Rauwolfia shrub, blocks a transporter called vesicular monoamine transporter (VMAT), which leads to a buildup of catecholamines in the cell and reduces sympathetic transmission. Another drug called guanethidine works in multiple ways, including blocking...
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Beyond genotype: serotonin transporter epigenetic modification predicts human brain function.

Yuliya S Nikolova1, Karestan C Koenen2, Sandro Galea2

  • 1Laboratory of NeuroGenetics, Department of Psychology &Neuroscience, and Institute for Genome Sciences &Policy, Duke University, Durham, North Carolina, USA.

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Epigenetic changes, specifically serotonin transporter gene methylation, are linked to brain activity. This finding was consistent across different study groups and methods.

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Area of Science:

  • Neuroscience
  • Genetics
  • Psychiatry

Background:

  • Epigenetic mechanisms, such as DNA methylation, play a crucial role in regulating gene expression.
  • The serotonin transporter gene (SLC6A4) is implicated in mood regulation and stress response.
  • Understanding epigenetic influences on brain function is vital for psychiatric research.

Purpose of the Study:

  • To investigate the relationship between epigenetic regulation of the serotonin transporter gene and human brain function.
  • To examine the impact of promoter methylation on amygdala reactivity and gene expression.

Main Methods:

  • Analysis of promoter methylation of the serotonin transporter gene in human brain tissue.
  • Measurement of amygdala reactivity using neuroimaging techniques.
  • Quantification of serotonin transporter gene mRNA expression in postmortem amygdala tissue.
  • Replication of findings in a second independent cohort.

Main Results:

  • Increased promoter methylation of the serotonin transporter gene was associated with heightened threat-related amygdala reactivity.
  • This methylation pattern also predicted decreased mRNA expression of the serotonin transporter gene in the amygdala.
  • The observed associations were independent of common genetic variations.
  • The link between methylation and amygdala reactivity was successfully replicated and proved robust across different sampling methods and age groups.

Conclusions:

  • Epigenetic modifications, specifically DNA methylation of the serotonin transporter gene promoter, are significant predictors of human brain function related to threat processing.
  • These findings highlight the role of epigenetics in mediating the relationship between genes and behavior.
  • The study provides a foundation for exploring epigenetic biomarkers in psychiatric disorders.