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Related Concept Videos

Psychosis: Pathophysiology of Schizophrenia and Other Psychotic Disorders01:27

Psychosis: Pathophysiology of Schizophrenia and Other Psychotic Disorders

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.
Researchers have identified genetic factors that increase susceptibility to schizophrenia, underscoring the intricate interplay between genetics and environment in disease development. At the core of schizophrenia's pathophysiology is excessive dopaminergic neurotransmission within the...
Biological Causes of Schizophrenia01:29

Biological Causes of Schizophrenia

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 studies.
Psychological and Sociocultural Causes of Schizophrenia01:29

Psychological and Sociocultural Causes of Schizophrenia

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...
Exon Recombination02:32

Exon Recombination

The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
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Point and Frameshift Mutations01:30

Point and Frameshift Mutations

Point mutations are genetic alterations involving the change of a single nucleotide base pair in DNA. Depending on how the alteration affects protein synthesis, they can lead to various consequences.Point mutations fall into the following types:Silent mutations occur when a nucleotide change does not alter the amino acid sequence due to the redundancy of the genetic code. For instance, changing ACC to ACA still encodes threonine, leaving the protein function unaffected. This occurs because...
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Drugs affecting neurotransmitter synthesis can impact the adrenergic neuron and the synthesis of neurotransmitters. For example, α-methyltyrosine and carbidopa target specific enzymes involved in catecholamine synthesis. α-methyltyrosine inhibits the enzyme tyrosine hydroxylase, which converts tyrosine into dopamine. By blocking this enzyme, α-methyltyrosine reduces dopamine production and other catecholamines. Carbidopa, on the other hand, inhibits the enzyme dopa decarboxylase, which converts...

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Updated: May 23, 2026

A Strategy to Identify de Novo Mutations in Common Disorders such as Autism and Schizophrenia
05:51

A Strategy to Identify de Novo Mutations in Common Disorders such as Autism and Schizophrenia

Published on: June 15, 2011

De novo mutation in schizophrenia.

Elliott Rees1, George Kirov, Michael C O'Donovan

  • 1MRC Centre for Neuropsychiatric Genetics and Genomics, Mental Health Research Institute, Cardiff University School of Medicine, Henry Wellcome Building, Heath Park, Cardiff, CF14 4XN, UK.

Schizophrenia Bulletin
|March 28, 2012
PubMed
Summary

Newly arising mutations, particularly copy number variations, are increasingly linked to schizophrenia genetics. These de novo mutations help maintain schizophrenia prevalence by replenishing genetic diversity lost through natural selection.

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A Strategy to Identify de Novo Mutations in Common Disorders such as Autism and Schizophrenia
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05:14

Standardized Data Acquisition for Neuromelanin-Sensitive Magnetic Resonance Imaging of the Substantia Nigra

Published on: September 8, 2021

Area of Science:

  • Genetics
  • Neuroscience
  • Psychiatry

Background:

  • Recent research highlights the role of de novo mutations in schizophrenia (SZ) etiology.
  • De novo mutations may explain stable SZ prevalence despite natural selection pressures.
  • Copy number variations (CNVs) are the most strongly associated de novo mutations with SZ.

Purpose of the Study:

  • To update estimates of negative selection acting against SZ-associated CNVs.
  • To review the evidence for de novo single-nucleotide mutations in SZ risk.
  • To synthesize current understanding of de novo mutation contributions to schizophrenia.

Main Methods:

  • Analysis of updated de novo CNV mutation rate data in SZ cases versus controls.
  • Review of next-generation sequencing studies investigating de novo single-nucleotide mutations in SZ.
  • Estimation of negative selection levels against SZ-associated CNVs.

Main Results:

  • De novo CNV mutation rates are elevated in schizophrenia cases compared to controls.
  • Genes affected by de novo CNVs are enriched for synaptic and developmental functions.
  • Preliminary evidence suggests de novo single-nucleotide mutations may also contribute to SZ risk, though studies are small-scale.

Conclusions:

  • De novo mutations, especially CNVs, are significant contributors to schizophrenia's genetic architecture.
  • Understanding de novo mutation dynamics is crucial for explaining schizophrenia prevalence.
  • Further research with larger sample sizes is needed to confirm the role of de novo single-nucleotide mutations in schizophrenia.