核細胞凝縮領域の変異はポリコンブ媒介による軸性パターンを破壊する
Mei Sheng Lau1,2, Matthew G Schwartz2, Sharmistha Kundu1
1Department of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114, USA.
Science (New York, N.Y.)
|March 11, 2017
まとめ
CBX2を含むポリコンブ群 (PcG) プロテインは,発達遺伝子を静止するために核粒子の圧縮を使用します. 変異したCBX2
科学分野:
- 発達生物学
- エピジェネティクス
- 分子生物学
背景:
- 核細胞はメタゾウの基本的なDNA包装単位で,ゲノム構造と調節に不可欠です.
- ポリコンブ群 (PcG) タンパク質は,前後軸のパターニングに不可欠なホックス遺伝子などの重要な発達遺伝子を抑制する.
- 哺乳類のポリコンブ抑制複合体1 (PRC1) の成分であるCBX2は,核細胞結合圧縮領域を有している.
研究 の 目的:
- マウスの発達中の遺伝子静止の維持における CBX2 圧縮領域の役割を調査する.
- CBX2媒介による核細胞凝縮が 適切な体格形成に不可欠かどうかを判断する.
主な方法:
- 変異性によるCBX2圧縮領域の機能分析
- 変異CBX2を持つマウスの体格の評価
- 変異フェノタイプとポリコンブ群の機能喪失変異の比較
主要な成果:
- CBX2の機能的な圧縮領域は,体の正しいパターンを形成するために必要である.
- CBX2圧縮領域の変異はホメオティックな変異を誘導する.
- これらの変異は,ポリコンブ群の機能喪失変異体で見られた現象型に似ています.
結論:
- CBX2媒介の核細胞圧縮は 遺伝子の静止を維持するための重要なメカニズムです
- このメカニズムはマウスの胚形成中にホックス遺伝子の発現を調節する上で重要な役割を果たします.
- CBX2の圧縮活動は,発達異常を予防し,適切な体軸形成を確保するために不可欠です.
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