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Related Concept Videos

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.
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The human genome is over 99.9% identical between individuals, yet genetic differences exist at millions of bases. The human genome contains approximately 3 million variant positions per individual, many of which are heterozygous, contributing to genetic diversity and individual traits. Genetic variations include single-nucleotide polymorphisms (SNPs), insertions, deletions, and copy number variations (CNVs).SNPs, the most common variation, involve single-base changes in DNA. These can be...
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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.
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...
Polygenic Traits01:18

Polygenic Traits

When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...
Polygenic Traits01:18

Polygenic Traits

When more than one gene is responsible for a given phenotype, the trait is considered polygenic. Human height is a polygenic trait. Studies have uncovered hundreds of loci that influence height, and there are believed to be many more. Due to the high number of genes involved, as well as environmental and nutritional factors, height varies significantly within a given population. The distribution of height forms a bell-shaped curve, with relatively few individuals in the population at the...
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Genetic variations significantly influence drug response through pharmacokinetics, receptor interactions, and biologic milieu modifications. Pharmacokinetic alterations impact drug metabolism and clearance, affecting efficacy and toxicity. Variants in drug-metabolizing enzymes, such as CYP2C9 and CYP2C19, alter drug activation and elimination. For example, CYP2C9 loss-of-function variants require lower warfarin doses to prevent excessive bleeding, while CYP2C19 variants reduce clopidogrel...

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A Strategy to Identify de Novo Mutations in Common Disorders such as Autism and Schizophrenia
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Published on: June 15, 2011

Common variants in polygenic schizophrenia.

Joseph T Glessner1, Hakon Hakonarson

  • 1Center for Applied Genomics, The Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA.

Genome Biology
|September 30, 2009
PubMed
Summary
This summary is machine-generated.

Common single-nucleotide polymorphisms in the Major Histocompatibility Complex (MHC) region are linked to schizophrenia. This, along with rare genetic variations, highlights the complex genetic basis of schizophrenia.

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Area of Science:

  • Neurogenetics
  • Psychiatric Genetics

Background:

  • Schizophrenia is a complex psychiatric disorder with a significant genetic component.
  • Previous research has identified rare copy-number variants associated with schizophrenia.

Purpose of the Study:

  • To investigate the role of common genetic variants in schizophrenia susceptibility.
  • To integrate findings from common and rare variant studies to understand schizophrenia's genetic architecture.

Main Methods:

  • Genome-wide association studies (GWAS) were utilized to identify common single-nucleotide polymorphisms (SNPs).
  • Analysis focused on the Major Histocompatibility Complex (MHC) locus, a region known for its immune function and genetic variability.

Main Results:

  • Common variant SNPs within the MHC locus were significantly associated with schizophrenia risk.
  • These findings complement existing knowledge of rare copy-number variant associations.

Conclusions:

  • The Major Histocompatibility Complex (MHC) is implicated in schizophrenia through common variants.
  • Schizophrenia exhibits a highly polygenic etiology, influenced by both common and rare genetic variations.