活動依存神経保護タンパク質 HP1 と CHD4 が系統を特定する遺伝子を制御する
Veronika Ostapcuk1,2, Fabio Mohn1, Sarah H Carl1,3
1Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland.
Nature
|May 26, 2018
まとめ
アクティビティ依存神経保護タンパク質 (ADNP) はCHD4とHP1と複合体を形成し,遺伝子発現と細胞運命を調節する. この複合体は
科学分野:
- 分子生物学
- 発達生物学
- 遺伝学
背景:
- ADNPのデノボ変異は,神経発達障害であるHelsmoortel-Van der Aa症候群を引き起こす.
- ADNPは胚の発達に不可欠ですが,その調節作用は不明です.
- 転写調節におけるADNPの機能と細胞運命を決定する影響は,明らかにする必要がある.
研究 の 目的:
- 転写調節と細胞運命を決定するADNPの分子メカニズムを調査する.
- ADNP,CHD4,HP1によって形成されたタンパク質複合体を特徴付ける.
- ADNP変異がヘルスモートル=ヴァン・ダー・ア症候群にどのように寄与するかを理解する.
主な方法:
- ADNP-CHD4-HP1複合体 (ChAHP) の形成と特徴づけ
- ユークロマチンのDNAモチーフへのCHAHP結合の分析
- ネズミの胚性幹細胞におけるCHAHP成分の遺伝的除去
- HP1媒介の静音化と比較して,CHAHP媒介の抑制メカニズムの調査.
主要な成果:
- ADNPはCHD4とHP1と安定した複合体であるCHAHPを形成する.
- ChAHPはユークロマチンの特定のDNAモチーフに結合する.
- CHAHP媒介による抑制は局所的に制限され,HP1媒介による静音化とは異なる.
- ChAHPの遺伝的消去は,自発的な分化と神経細胞の発達障害につながる.
- ADNPの無意味な変異は,Helsmoortel-Van der Aa症候群と一致する ChAHPの整合性を破壊する.
結論:
- ChAHP複合体を通して,ADNPは細胞運命を決定する重要な遺伝子発現を調節する.
- 細胞運命の可塑性におけるCHAHPの役割は,ADNP変異の多臓器効果を説明する可能性がある.
- 早期停止コドンのリボソームの読み込みを標的とした治療戦略は,患者に利益をもたらす可能性があります.
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