全ゲノムショットガン配列解析を用いたパン小麦のゲノム解析
Rachel Brenchley1, Manuel Spannagl, Matthias Pfeifer
1Centre for Genome Research, University of Liverpool, Liverpool L69 7ZB, UK.
Nature
|November 30, 2012
まとめ
研究者はパン小麦 (Triticum aestivum) のゲノムを配列化し,9万以上の遺伝子を特定しました. このゲノム資源は,遺伝子損失と拡張に関する洞察を明らかにし,作物改良の取り組みを支援しています.
科学分野:
- ゲノミクスゲノミクスとは
- 植物生物学 植物生物学
- 農業科学 農業科学とは
背景:
- パン小麦 (Triticum aestivum) は,人間のカロリー摂取量の20%を供給する,重要な世界的な食糧源です.
- パン小麦の巨大で複雑な六倍体ゲノムは,歴史的に包括的なゲノム解析を妨げています.
- ゲノム資源は,遺伝的多様性および特性の分析を通じて小麦の生産を増やすために不可欠です.
研究 の 目的:
- パン小麦のヘキサプロイドゲノムを配列化し分析する.
- パン小麦のゲノムとその二倍体祖先と比較するために.
- 農作物の改良のための遺伝子と遺伝的変異を特定する.
主な方法:
- 454の熱配列解析を用いて17ギガ塩基対の六倍形パン小麦ゲノムの配列決定.
- ディプロイドの祖先および祖先ゲノムとの比較分析.
- 高解像度の合成マップの構築.
主要な成果:
- 9万4千~9万6千の遺伝子が特定され,その3分の2がA,B,Dサブゲノムに割り当てられました.
- 保存された遺伝子の順序における多数の小さな混乱の発見.
- 重要な遺伝子ファミリーメンバーの喪失と,ポリプロイド化と家畜化後の遺伝子断片の豊富さの証拠.
- エネルギー採集,代謝,成長に関連する拡張遺伝子ファミリーの特定,作物生産性と潜在的に関連している.
結論:
- パン小麦のゲノムは非常にダイナミックで,進化の過程で大きな変化を経験しています.
- 配列化されたゲノムは,遺伝子の発見を加速し,小麦の繁殖を強化するための貴重なリソースを提供します.
- 遺伝的多様性とゲノムダイナミクスを理解することは,この世界的に重要な作物の改善の鍵です.
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