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Genome-wide Association Studies-GWAS01:11

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Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
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Bipolar Disorder01:30

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Bipolar disorder is a chronic mental health condition marked by significant mood fluctuations, including episodes of mania and depression. Elevated energy levels, heightened mood or irritability, impulsive behavior, reduced sleep needs, rapid speech, racing thoughts, inflated self-esteem, and distractibility characterize mania. Individuals with bipolar disorder often alternate between depressive and manic states, with periods of emotional stability lasting an average of six months to a year.
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Human Genetics01:28

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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.
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Behavior genetics explores how genetic inheritance influences human behavior. It focuses on how genes, passed from parents to offspring, contribute to the development of behavioral traits and tendencies. This branch of genetics seeks to understand the complex interplay between inherited genetic factors and environmental influences in shaping our behaviors.
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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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The Diagnostic and Statistical Manual of Mental Disorders (DSM) serves as the primary classification system for mental health disorders, providing standardized diagnostic criteria for clinicians and researchers. First published by the American Psychiatric Association (APA) in 1952, the DSM has undergone several revisions to reflect evolving psychiatric understanding. The fifth edition, DSM-5, released in 2013, introduced key updates that expanded diagnostic categories and modified diagnostic...
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Related Experiment Video

Updated: Jul 2, 2025

Mapping Alzheimer's Disease Variants to Their Target Genes Using Computational Analysis of Chromatin Configuration
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Identifying genetic differences between bipolar disorder and major depression through multiple GWAS.

Georgia Panagiotaropoulou1, Kajsa-Lotta Georgii Hellberg2, Jonathan R I Coleman3,4

  • 1Department of Psychiatry and Psychotherapy, Charité - Universitätsmedizin Berlin, Berlin, Germany.

Medrxiv : the Preprint Server for Health Sciences
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Summary

Genetic studies reveal that major depressive disorder (MDD) and bipolar disorder (BD) are distinct, with polygenic risk scores aiding early diagnosis. These findings suggest a genetic continuum between controls, MDD, and BD.

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Area of Science:

  • Psychiatric Genomics
  • Genetic Epidemiology

Background:

  • Accurate diagnosis of bipolar disorder (BD) is challenging, with delays often exceeding seven years due to initial depressive episodes mimicking unipolar major depressive disorder (MDD).
  • Distinguishing between BD and MDD is critical for effective treatment and patient outcomes.

Approach:

  • Genome-wide association studies (GWAS) and polygenic risk score (PRS) analyses were employed using a large cohort (N=51,149) comprising BD cases, MDD cases, and controls.
  • Data from the Psychiatric Genomics Consortium was utilized, with rigorous merging and quality control procedures applied.

Key Points:

  • While GWAS did not identify genome-wide significant loci, significant SNP-heritability was observed.
  • Polygenic risk scores demonstrated the ability to differentiate BD from MDD, including BD cases with initial depressive onset.
  • PRS findings were replicated in an independent cohort, though individual locus signals were not.

Conclusions:

  • Major depressive disorder (MDD) and bipolar disorder (BD) are genetically distinct conditions.
  • Evidence supports a continuum of genetic risk across controls, MDD, and BD.
  • Future research with larger sample sizes is needed to refine genetic predictors for early differential diagnosis.