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Related Concept Videos

Schizophrenia01:17

Schizophrenia

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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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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.
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Psychological and Sociocultural Causes of Schizophrenia01:29

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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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Biological Causes of Schizophrenia01:29

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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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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.
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Ultrarare Coding Variants and Cognitive Function in Schizophrenia.

Hugo D J Creeth1, Elliott Rees1, Sophie E Legge1

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Ultrarare constrained variants (URCVs) are linked to impaired cognitive function in schizophrenia. These genetic factors contribute to cognitive decline both before and after the disorder

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Area of Science:

  • Neurogenetics
  • Psychiatric Disorders
  • Cognitive Neuroscience

Background:

  • Cognitive impairment in schizophrenia significantly impacts functional outcomes.
  • The role of rare genetic variants in schizophrenia-related cognitive deficits remains largely unexplored.
  • Identifying genetic contributors to cognitive dysfunction is crucial for understanding schizophrenia pathophysiology.

Purpose of the Study:

  • To investigate the association between ultrarare constrained variants (URCVs) and cognitive function in individuals diagnosed with schizophrenia.
  • To determine if URCVs contribute to both current cognitive abilities and premorbid cognitive estimations in schizophrenia patients.

Main Methods:

  • A within-case genetic association study utilizing exome sequencing data from 802 schizophrenia patients.
  • Linear regression models were employed to assess the relationship between URCVs and cognitive measures (current cognition and premorbid IQ).
  • Multivariable regression analyses were conducted to evaluate the independent contributions of URCVs, polygenic risk scores, and copy number variants to cognitive ability.

Main Results:

  • Ultrarare constrained variants (URCVs) were significantly associated with lower current cognitive scores (P=.005).
  • Premorbid IQ showed an association with URCVs (P=.02) and partially attenuated the link between URCVs and current cognition.
  • Multivariable analysis confirmed URCVs' independent contribution to current cognitive function, even after accounting for premorbid IQ (P=.03).

Conclusions:

  • Ultrarare constrained variants (URCVs) significantly contribute to the variance in cognitive function observed in schizophrenia.
  • These genetic associations appear to operate both before and after the onset of the disorder.
  • Genomic data, particularly URCVs, holds potential for identifying individuals at high risk for cognitive impairment in schizophrenia, enabling targeted interventions.