重度の非症候群性散発性知的障害に関連する遺伝子の変異の範囲:エクソームシーケンシングの研究
Anita Rauch1, Dagmar Wieczorek, Elisabeth Graf
1Institute of Medical Genetics, University of Zurich, Schwerzenbach-Zurich, Switzerland.
Lancet (London, England)
|October 2, 2012
まとめ
遺伝子のデノボ変異は,重症で散発的な知的障害と関連しており,患者の45~55%に影響を及ぼしている. この研究は,新しい病気を引き起こす変異を特定し,知的障害の遺伝子診断を改善しました.
科学分野:
- 遺伝学 遺伝学とは
- 神経科学は神経科学である.
- 発達生物学 発達生物学について
背景:
- 知的障害 (ID) の遺伝的基盤は,形態学的指標と効果的なスクリーニング方法が不足しているため,しばしば不明です.
- デノボ変種を特定することは,散発的,非症候群的IDを理解するために非常に重要です.
研究 の 目的:
- 散発的な非症候群的知的障害を有する個体におけるde novo変異を特定する.
- IDの病因学におけるde novo変異の役割を調査する.
主な方法:
- 全エクソームシーケンシングは,IDと親の51人の参加者に実施されました.
- De novoの変異は,患者と親のエクソーム配列を比較することによって特定されました.
- 比較のために,20人の対照エクソムのデータを使用した.
主要な成果:
- デノボ変種は,ID患者の88%と対照群の70%で発見されました.
- IDグループでは,機能喪失変異の割合がより高いことが観察されました (p=0.022).
- 16人の患者は既知のID遺伝子 (STXBP1,SYNGAP1,SCN2Aなど) の新規変異を有しており,6つの新しい疾患を引き起こす遺伝子が特定されました.
結論:
- デノボ点変異と小さなインデルは,重症で散発的な非症候群性IDと関連しており,症例の45~55%を説明しています.
- 高い場所の異質性が観察され,オートソームリセッシブ遺伝による寄与は限られていた.
- 新型変異の患者の中には,予期される症候群の特徴を示さなかったため,臨床記述は偏っている可能性があります.
関連する概念動画
Intellectual Disability
Intellectual disability (ID) is a neurodevelopmental condition characterized by deficits in intellectual and adaptive functioning that manifest during the developmental period. This condition encompasses challenges in reasoning, memory, problem-solving, and learning, accompanied by impairments in everyday life skills, such as communication, self-care, and social interactions. Intellectual disability affects approximately 1% of the population in the United States, impacting an estimated 5...
Mutations
Overview
Mutations
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.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
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.
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Genome-wide Association Studies-GWAS
Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
GWAS does not require the identification of the target gene involved in...
GWAS does not require the identification of the target gene involved in...
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...
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...


