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小さな微生物のゲノム:長い共生関係の終わり?
Vicente Pérez-Brocal1, Rosario Gil, Silvia Ramos
1Institut Cavanilles de Biodiversitat i Biologia Evolutiva, Universitat de València, Apartado Postal 22085, 46071 València, Spain.
Science (New York, N.Y.)
|October 14, 2006
まとめ
Buchnera aphidicola BCcのゲノムは極端な減少を示し,重要な代謝機能を失い,急速に進化しています. これは,共生能力の潜在的な喪失を示唆し,共存する二次共生体によって補償される可能性がある.
科学分野:
- 微生物学 微生物学とは
- ゲノミクスゲノミクスとは
- 進化生物学の進化生物学について
背景:
- 細胞内細菌はしばしばゲノム縮小を示す.
- Buchnera aphidicolaは,アフィドの主要なエンドシンバイオンである.
- 以前のブッヘンラゲノムでは,有意な減少が示されました.
研究 の 目的:
- シナラ・セドリ (Cinara cedri) の主要エンドシンビオントであるBuchnera aphidicola BCcのゲノムを分析する.
- ゲノム縮小の範囲とその機能的影響を調査する.
- 進化の軌跡とB. aphidicola BCc.の共生的な役割を調査する.
主な方法:
- Buchnera aphidicola BCc.の全ゲノムシーケンシングについて
- 他の Buchnera 株との比較ゲノム分析.
- 遺伝子喪失と機能的経路の特定.
主要な成果:
- B. aphidicola BCc ゲノム (422,434 bp) は,以前に配列化されたゲノムよりも ~200 kb 小さくなっています.
- トリプトファンとリボフラビン合成を含む代謝機能の重大な喪失.
- 保存されたほとんどの遺伝子の急速な進化が観察されました.
結論:
- B. aphidicola BCcは,極端なゲノム減少と代謝機能障害を示しています.
- エンドシンビオントはシンビオティックな能力を失っているかもしれない.
- 併存する二次共生生物は,B. aphidicola BCcの機能を補完したり,代替したりしているかもしれません.
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