DNAトランポゾンがゲノムスケールでイントロンを生成するメカニズム
Jason T Huff1,2, Daniel Zilberman1, Scott W Roy3
1Department of Plant and Microbial Biology, University of California, Berkeley, California 94720, USA.
Nature
|October 28, 2016
まとめ
短いDNAトランポゾンは,真核遺伝子の多数のイントロンを生成した. この発見は,進化の過程で急速なイントロンの増殖を説明し,イントロンの増殖の一般的なメカニズムを提供します.
科学分野:
- 分子生物学
- 進化生物学
- ゲノミクス
背景:
- イントロンはRNA処理中に除去された遺伝子配列です.
- ほとんどの真核遺伝子はイントロンを含んでおり,進化の過程でエピソード的増加の証拠がある.
- ゲノムスケールでの経験的支持が欠けていた.
研究 の 目的:
- ユカリオットのゲノムにおけるエピソード的イントロンの増加の背後にあるメカニズムを調査する.
- イントロン生成の特定のメカニズムの経験的証拠を提供すること.
主な方法:
- Micromonas pusillaとAureococcus anophagefferensのゲノム配列を分析した
- 短い非自律的なDNAトランスポーソンの識別と特徴付け
- トランポゾン挿入部位とスプライス部位と核細胞との関連を調べる.
主要な成果:
- 短いDNAトランポゾンは,両種で独立して数百から数千のイントロンを生成することが判明しました.
- 各トランスポーソンは1つのスプライスサイトを提供し,もう1つは複製された遺伝子配列からコオプットされた.
- トランポゾン挿入パターンは,イントロン相バイアスと核分裂体サイズのエクソンの流行を説明した.
結論:
- 一般的なDNAトランポゾンメカニズムは,真核生物の進化過程で急速で広範なイントロンの獲得を説明します.
- このメカニズムは,真核生物における観察されたイントロンとエクソンの構造に対する妥当な説明を提供する.
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