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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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Polygenic Traits01:18

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When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...
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Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.
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Related Experiment Video

Updated: Jun 15, 2025

Measurement of Fronto-limbic Activity Using an Emotional Oddball Task in Children with Familial High Risk for Schizophrenia
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Brain Imaging Phenotypes Associated with Polygenic Risk for Essential Tremor.

Miranda Medeiros1,2, Alexandre Pastor-Bernier2, Houman Azizi2,3

  • 1Department of Human Genetics, McGill University, Montréal, Quebec, Canada.

Movement Disorders : Official Journal of the Movement Disorder Society
|March 15, 2025
PubMed
Summary
This summary is machine-generated.

Essential tremor (ET) genetic risk influences brain structure and white matter integrity even before symptoms appear. This study reveals presymptomatic brain vulnerabilities in healthy individuals with high ET polygenic risk scores (PRS).

Keywords:
MRIcommon genetic variantsessential tremorpolygenic risk scorespresymptomatic

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Area of Science:

  • Neuroscience
  • Genetics
  • Medical Imaging

Background:

  • Essential tremor (ET) is a prevalent movement disorder with a significant genetic component.
  • Current understanding of how genetic predisposition leads to ET pathogenesis is limited.
  • Brain imaging techniques like MRI have identified structural abnormalities in ET patients.

Purpose of the Study:

  • To investigate presymptomatic brain vulnerabilities associated with essential tremor genetic risk.
  • To explore the relationship between ET polygenic risk scores (PRS) and brain structural/microstructural differences in healthy individuals.
  • To identify early neurobiological markers of ET susceptibility.

Main Methods:

  • Utilized data from approximately 30,000 UK Biobank participants.
  • Analyzed associations between ET-PRS and diffusion-weighted MRI (dMRI) and T1 MRI metrics (morphometry, white/grey matter microstructure).
  • Included secondary analysis comparing low PRS individuals with a small cohort of ET patients.

Main Results:

  • Significant associations found between ET-PRS and white matter integrity (mean diffusivity, fractional anisotropy, etc.) in motor control pathways.
  • ET-PRS correlated with grey matter microstructure in key areas like the red nucleus, caudate, putamen, and motor thalamus.
  • Reduced grey matter volumes were observed in ET-PRS individuals, particularly in the cerebellum and other cortical/subcortical regions. Structural anomalies mapped to networks relevant to ET surgical treatments.

Conclusions:

  • High genetic risk for ET is linked to structural brain vulnerabilities, including white and grey matter alterations, even in asymptomatic individuals.
  • These findings suggest that genetic factors can disrupt brain networks relevant to ET pathology before the onset of clinical symptoms.
  • Identified brain structural changes in at-risk individuals may serve as early indicators of ET development.