ガストルレーション中のTETタンパク質の内在的および外在的効果
Saifeng Cheng1, Markus Mittnenzweig2, Yoav Mayshar1
1Department of Molecular Cell Biology, Weizmann Institute of Science, 7610001 Rehovot, Israel.
Cell
|July 31, 2022
まとめ
10−11 転位 (TET) 遺伝子の喪失は胚の死亡を引き起こす. TET欠乏細胞は野生型胚内で分化できますが,突然変異した胚だけが早期発育に失敗し,細胞自律のTET機能を明らかにします.
科学分野:
- 発達生物学
- エピジェネティクス
- 遺伝学
背景:
- 10−11 転位 (TET) タンパク質は重要な表遺伝子調節因子である.
- ネズミの全TET遺伝子の喪失は,早期の胃細胞死亡につながり,その特定の機能の研究を複雑にします.
- 細胞の自律性と 胚の致死性の環境効果を 解明することが不可欠です
研究 の 目的:
- マウスの初期胚発達における TET タンパク質の細胞自律的役割を分離し,定義する.
- TET喪失による発達障害の原因となる 分子メカニズムを調査する.
- 胚形成中の内在遺伝子の機能を評価するための方法論を確立する.
主な方法:
- 部分的または完全なTET遺伝子欠陥を持つマウス胚のタイムラル単細胞アトラスを利用した.
- 完全に変異した胚の環境に対して,野生型のTET変異細胞の微分化可能性を分析した.
- 早期の表皮細胞因子と中皮細胞のシグナル伝達経路を含む遺伝子発現の変化をマッピングした.
主要な成果:
- テト変異細胞は,野生型細胞に囲まれても,分化の可能性を保持した.
- TET欠乏細胞のみで構成された胚は,上皮質から外皮質への移行と中皮質の発達に欠陥を示した.
- Dppa4とGdf3の抑制とLefty,FGF,Notchのシグナリングの障害がTET喪失の主要な結果として特定されました.
- 主なメカニズムとして強化剤の脱メチル化が失われている.
結論:
- TETタンパク質は,細胞内部の発達進行,特にメソデルマ形成およびシグナル伝達に不可欠である.
- この研究は,発達中の遺伝子機能を解剖するために,時差分別アトラスを用いた新しいアプローチを提供します.
- この研究は,TET脱メチル化機構の細胞内作用と,より広範な組織レベルの影響を区別する.
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