転置可能な要素を介した規制ネットワークの再配線による投与量補償
Christopher E Ellison1, Doris Bachtrog
1Department of Integrative Biology, University of California, Berkeley, Berkeley, CA 94720, USA.
まとめ
適用可能な要素 (TEs) は,新しい規制要素を提供することによって,進化的イノベーションを推進することができます. ドロソフィラでは,ヘリトロン TEが,男性特異的致死性 (MSL) 複合体の結合部位を供給し,X染色体用量補償を支援するために飼いならされた.
科学分野:
- 進化遺伝学の進化遺伝学について
- 分子生物学は分子生物学である.
- ゲノミクスゲノミクスとは
背景:
- 転置可能な要素 (TEs) は,新しいシス調節配列の源として作用し,進化的イノベーションを推進する可能性があります.
- ドロソフィラの男性特異的致死性 (MSL) 複合体は,X染色体上の遺伝子発現を調節し,男性における用量補償を行う.
- 規制ネットワークの形成におけるTEsの役割を理解することは,ゲノム進化の理解に不可欠です.
研究 の 目的:
- 規制ネットワークの進化における,適用可能な要素の役割を調査する.
- TEsが男性特異的致死性 (MSL) 複合体に対してシス調節要素を寄与するメカニズムを検証する.
- TE化過程とその遺伝子調節と染色体進化への影響を理解する.
主な方法:
- ドロソフィラのX染色体の比較ゲノム分析.
- 転置可能な要素挿入の識別と特徴付け.
- MSL結合部位の活性を評価するための機能検査.
主要な成果:
- ミュータントのヘリトロントランスポーザブルエレメントは,新たに進化したX染色体 (ネオ-X) に多数のMSL結合部位を供給するために独立してコオプットされました.
- これらのヘリトンは,MSLの結合部位が機能的ではあるが,不最適であるにもかかわらず,ネオ-X.の投与量補償を容易にします.
- 古いX染色体領域 (XR) は,新しい結合部位を獲得するのではなく,古代のTE由来結合部位を微調整している証拠を示しています.
結論:
- 移行可能な要素の家庭化と増幅は,新しいcis-regulatory要素を供給することによって,規制ネットワークを迅速にリワイヤすることができます.
- TE媒介による最初の再配線の後,規制要素は微調整され,非機能領域は侵食されることがあります.
- この研究は,TEs,規制複合体の進化,および染色体の進化の間のダイナミックな相互作用を強調しています.
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