スポラディックな自閉症エクソームは,デノボ変異の高度に相互接続されたタンパク質ネットワークを明らかにします
Brian J O'Roak1, Laura Vives, Santhosh Girirajan
1Department of Genome Sciences, University of Washington School of Medicine, Seattle, Washington 98195, USA.
Nature
|April 13, 2012
まとめ
De novo変異は,しばしば父性であり,特に父親の年齢が増加するにつれて,自閉症スペクトラム障害 (ASD) のリスクと関連しています. 破壊的な突然変異は,重要な遺伝子ネットワークを標的にし,ASDのための新しい診断と治療の道を提供しています.
科学分野:
- 遺伝学 遺伝学とは
- 神経発達障害 神経発達障害とは
- ゲノム医学はゲノム医学である.
背景:
- 自閉症スペクトル障害 (ASD) には重要な遺伝的基盤がありますが,症例の70%以上で原因は不明です.
- ASDの既往歴のない散発的またはシンプレックスファミリーは,de novo変異を含むと仮定されています.
- これらの遺伝的基盤を理解することは,診断と治療において極めて重要です.
研究 の 目的:
- 散発的なASDにおけるde novo変異の役割を調査する.
- ASD発症に伴う特定の遺伝子や経路を特定する.
- 父の年齢とASDにおけるデノボ変異率との関係を調査する.
主な方法:
- 散発的なASDを持つ189の新規および20の以前に報告された親子トリオの全エクソームシーケンシング.
- これらの家族から50人の影響を受けていない兄弟姉妹のエクソームシーケンシング.
- 候補遺伝子 (CHD8,NTNG1,GRIN2B,LAMC3,SCN1A) の突然変異スクリーニングは,1703人のASD被験者に実施した.
主要な成果:
- デノボ点変異は主に父親による (4:1比) であり,父親の年齢と相関していた.
- 重度のde novo変異の39%は,ASD候補遺伝子に関連したβ-カタニン/クロマチンの改造ネットワークに影響した.
- CHD8とNTNG1で再発性突然変異が発見され,GRIN2B,LAMC3,SCN1A.で新たな突然変異が確認された.
結論:
- De novo変異は,特にシンプレックスファミリーにおいて,ASDリスクに大きく寄与する.
- 父の年齢はリスク因子であり,おそらくde novo変異率の増加によるものです.
- 特定された遺伝子とネットワークは,極端な場所の異質性にもかかわらず,将来のASD診断と治療のためのターゲットを提供します.
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