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Related Concept Videos

Schizophrenia01:17

Schizophrenia

847
Schizophrenia, a term introduced by Swiss psychiatrist Eugen Bleuler in 1911, describes a severe psychological disorder marked by profound disruptions in attention, thought processes, language, emotion, and interpersonal relationships. The core feature of schizophrenia is psychosis — a state characterized by a fundamental detachment from reality. This disconnection manifests through distorted logic, impaired perception, and atypical behavior, severely affecting the lives of those...
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Biological Causes of Schizophrenia01:29

Biological Causes of Schizophrenia

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Schizophrenia, a severe psychiatric disorder, arises from a complex interplay of biological factors, including genetic predisposition, structural brain abnormalities, neurotransmitter dysregulation, and developmental irregularities. These factors collectively contribute to the onset and progression of the disorder, which typically manifests in late adolescence or early adulthood.
Genetic Factors in Schizophrenia
The genetic basis of schizophrenia is strongly supported by family and twin...
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Psychological and Sociocultural Causes of Schizophrenia01:29

Psychological and Sociocultural Causes of Schizophrenia

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Schizophrenia, a complex psychiatric disorder, has been historically misunderstood. Early psychological theories attributed its origins to childhood trauma and unresponsive parenting. However, contemporary research largely rejects these notions, favoring the vulnerability-stress hypothesis. This model proposes that individuals with a genetic predisposition to schizophrenia may develop the disorder following exposure to significant environmental stressors. Notably, studies on high-risk...
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Diagnosing acid-base imbalances involves systematically analyzing arterial blood samples, focusing on three key measurements: pH, bicarbonate (HCO3−) concentration, and carbon dioxide partial pressure (PCO2). This analysis follows a four-step process that helps identify the imbalance's underlying cause and nature.
First, the pH level is assessed to determine whether the blood pH is normal (7.35–7.45), low (acidosis), or high (alkalosis).
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Negative and Cognitive Symptoms of Schizophrenia01:30

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Negative symptoms of schizophrenia indicate a reduction or absence of typical behaviors and emotional responses found in healthy individuals, while positive symptoms reflect an excess or distortion of normal functioning.
Negative Symptoms
Negative symptoms of schizophrenia manifest as deficits in normal emotional and behavioral functioning, profoundly impacting daily life. Individuals with schizophrenia often display a flat affect, characterized by a near-total absence of emotional expression,...
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A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
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Related Experiment Video

Updated: Jan 25, 2026

Methylated DNA Immunoprecipitation
21:24

Methylated DNA Immunoprecipitation

Published on: January 2, 2009

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Analyzing DNA methylation patterns in subjects diagnosed with schizophrenia using machine learning methods.

Behrooz Torabi Moghadam1, Mitra Etemadikhah2, Grazyna Rajkowska3

  • 1Department of Cell and Molecular Biology, Computational and Systems Biology, Uppsala University, Uppsala, Sweden.

Journal of Psychiatric Research
|April 26, 2019
PubMed
Summary
This summary is machine-generated.

This study investigated DNA methylation in schizophrenia brain tissue but found no significant differences between patients and controls. Results suggest any methylation changes are complex and heterogeneous.

Keywords:
ClassificationClusteringDNA methylationMachine learningSchizophrenia

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Genetics

Background:

  • Schizophrenia is a common mental disorder with high heritability and complex genetic underpinnings.
  • Over a hundred risk loci have been identified, with environmental and epigenetic factors also implicated.
  • Previous epigenetic analyses in schizophrenia have produced ambiguous and conflicting results.

Purpose of the Study:

  • To investigate genome-wide DNA methylation patterns in post-mortem brain tissue from individuals with schizophrenia and healthy controls.
  • To identify differentially methylated patterns associated with schizophrenia using advanced analytical methods.

Main Methods:

  • Analysis of fresh frozen post-mortem brain tissue from 73 schizophrenia patients and 52 controls.
  • Utilized the Illumina Infinium HumanMethylation450 Bead Chip for genome-wide DNA methylation profiling.
  • Employed Bioconductor Minfi package, machine learning, and visualization techniques for differential methylation analysis.

Main Results:

  • No significant genome-wide DNA methylation signals were detected to distinguish schizophrenia patients from healthy controls.
  • The applied analytical methods, successful in other studies, did not uncover significant differentially methylated patterns in this cohort.
  • This suggests that any methylation changes associated with schizophrenia are likely heterogeneous and complex with small effect sizes.

Conclusions:

  • This study did not identify significant genome-wide DNA methylation differences in the analyzed post-mortem brain tissue between schizophrenia patients and controls.
  • The findings indicate that epigenetic alterations in schizophrenia, if present, are not readily detectable by current methods in bulk tissue and may be highly complex or localized.
  • Further research with larger cohorts, specific cell types, or alternative epigenetic analyses may be needed to elucidate the role of DNA methylation in schizophrenia pathogenesis.