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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.
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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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Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...
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Mutations01:35

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Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
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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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Low-Level Brain Somatic Mutations Are Implicated in Schizophrenia.

Myeong-Heui Kim1, Il Bin Kim2, Junehawk Lee3

  • 1Graduate School of Medical Science and Engineering, Korea Advanced Institute for Science and Technology, Daejeon, Republic of Korea.

Biological Psychiatry
|April 19, 2021
PubMed
Summary
This summary is machine-generated.

Brain somatic mutations are linked to schizophrenia (SCZ) pathogenesis. This study found SCZ-related pathways enriched in brain somatic mutations, including GRIN2B mutations affecting neuronal function.

Keywords:
Brain somatic mutationsGenetic architectureGlutamate receptor signaling pathwaysGrin2B, Low-level somatic mutationsSchizophrenia

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Area of Science:

  • Neuroscience
  • Genetics
  • Psychiatry

Background:

  • Somatic mutations in the brain are increasingly recognized as causes of neurodevelopmental disorders.
  • The role of brain somatic mutations in schizophrenia (SCZ) remains largely unknown.

Purpose of the Study:

  • To investigate the presence and impact of brain somatic mutations in individuals with schizophrenia.
  • To determine if specific pathways are enriched for somatic mutations in SCZ brains.

Main Methods:

  • Deep whole exome sequencing of matched brain and peripheral tissue from 27 SCZ patients and 31 controls.
  • Comprehensive analysis of somatic mutations, including signatures, patterns, and pathway enrichment.
  • Functional study of GRIN2B mutations in primary neural cultures.

Main Results:

  • No significant difference in the number or type of somatic mutations between SCZ patients and controls.
  • Somatic mutations in SCZ brains were significantly enriched for SCZ-related pathways (dopamine, glutamate receptors, long-term potentiation).
  • Deleterious brain somatic mutations in GRIN2B were identified in two SCZ patients, disrupting GRIN2B localization in neurons.

Conclusions:

  • Brain somatic mutations are associated with the pathogenesis of schizophrenia.
  • Specific enriched pathways suggest potential mechanisms underlying SCZ in affected individuals.