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Non-LTR Retrotransposons03:18

Non-LTR Retrotransposons

As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
Alternative RNA Splicing02:18

Alternative RNA Splicing

Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
Comparing Copy Number Variations and SNPs02:26

Comparing Copy Number Variations and SNPs

Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
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...

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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

統合失調症に関連した大きな再発性微細切除は,統合失調症に関連する.

Hreinn Stefansson1, Dan Rujescu, Sven Cichon

  • 1CNS Division, deCODE genetics, Sturlugata 8, IS-101 Reykjavík, Iceland.

Nature
|August 1, 2008
PubMed
まとめ

希少な複製数変異 (CNVs) は統合失調症のリスクと関連しています. この研究では,統合失調症に関連した3つの特定の欠損が特定され,重度の精神障害における希少遺伝子変異の役割を強調しました.

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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

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09:16

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A Novel Strategy Combining Array-CGH, Whole-exome Sequencing and In Utero Electroporation in Rodents to Identify Causative Genes for Brain Malformations
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科学分野:

  • 遺伝学 遺伝学とは
  • 精神科医は精神病を患っている.
  • ゲノム医学はゲノム医学である.

背景:

  • 重度の精神疾患における受精率の低下は,リスクアレルに負の選択圧力を及ぼします.
  • これは,自閉症,統合失調症,精神障害のリスクを与える一般的な変種がないことを説明するかもしれません.
  • 希少な変種は,これまで考えられていたよりも,全体的な遺伝的リスクに大きく寄与する可能性があります.

研究 の 目的:

  • ゲノム全体のアプローチを使用して,統合失調症に関連するコピー番号変異 (CNVs) を特定する.
  • 統合失調症の遺伝的エチオロギーにおけるde novo CNVsの役割を調査する.
  • 特定されたCNVの統合失調症および関連する精神病との関連性を検証する.

主な方法:

  • 9,878件の親子伝播の全ゲノム分析により,de novo CNVs.を特定しました.
  • 統合失調症の1,433例と33,250人の対照群 (第I段階) で,66のde novo CNVの関連試験を行った.
  • 3,285例と7,951対照群 (第2段階) の2番目のサンプルにおける有意な削除の複製分析.

主要な成果:

  • 1q21.1,15q11.2,および15q13.3の3つの削除は,I段階の統合失調症との名目関連を示しました.
  • この3つの削除はすべて,統合されたサンプルの統合失調症および関連する精神病と有意に関連しています.
  • これらの特定されたCNVは,希少で再発性であり,ネガティブ・セレクションの対象となります.

結論:

  • 1q21.1,15q11.2,および15q13.3の珍しい,再発性CNVは,統合失調症の重要なリスク要因です.
  • CNV分析は,統合失調症における遺伝的リスク変異を特定するための貴重なツールです.
  • この研究は,統合失調症に関連する遺伝子と経路における追加の流行リスク変異の発見を導くかもしれない.