異種DNAの配列依存的活性と分断 ユカリオット核
Léa Meneu1,2, Christophe Chapard1, Jacques Serizay1
1Institut Pasteur, CNRS UMR 3525, Université Paris Cité, Unité Régulation Spatiale des Génomes, Paris, France.
まとめ
DNA配列の組成は染色体構造の形成を決定し, 異なった転写と静かな区画を生成する. この組織は進化的共進化とは独立して発生し 核の分割を予測する.
科学分野:
- 分子生物学
- ゲノミクス
- エピジェネティクス
背景:
- ユーカリオットのクロマチンの折り畳みは,ゲノム配列と共進化するDNA関連タンパク質複合体によって調整されます.
- 同進化の欠如におけるDNA配列とクロマチンの構成要素の負荷/活性との相互作用は,ほとんど未調査のままである.
研究 の 目的:
- DNA配列とクロマチンの自発的な負荷と活性との関係を調べる.
- 異なるクロマチン原型がヘテロクロマチン形成と共同進化から独立して形成されるかどうかを決定する.
- クロマチン組織と核分割の配列ベースの予測の可能性を探求する.
主な方法:
- バクテリアのゲノムをSaccharomyces cerevisiaeに統合し,異なる進化の文脈でクロマチンの形成を研究する.
- ヌクレオソーム,コヘシン,およびトランスクリプション機構の負荷および外因的なDNA配列の活性に関する分析.
- 染色体原型を予測するためにネイティブゲノムで訓練されたニューラルネットワークの適用.
主要な成果:
- 核細胞,コヘシン,および転写機構は,酵母に統合された細菌のDNAで自発的に2つの異なるクロマチンの原型 (転写および静音) を形成します.
- これらの原型は配列組成に依存し,ヘテロクロマチンとは独立して形成される.
- この2つの原型は核内で混じり合わず,二重の核分割を確立する.
- ユーカリオットの外因的な配列におけるクロマチンの原型も配列の構成に依存し,神経ネットワークによって予測することができる.
結論:
- DNA配列の構成は,クロマチンの折り畳みと組織を決定する主要な要素であり,異なる機能的区画を確立することができる.
- 転写されたと静かなクロマチンの原型の形成は,進化的共同進化とヘテロクロマチンの独立である.
- 配列ベースの予測モデルは,クロマチンの組織と核の分割を予測し,ゲノム構造の洞察を提供します.
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