遅延時間の最適化は,進化した細菌集団における抗生物質耐性の基礎となっている
Ofer Fridman1, Amir Goldberg1, Irine Ronin1
1Racah Institute of Physics, The Sudarsky Center for Computational Biology and the Center for NanoScience, Edmond J. Safra Campus, The Hebrew University, Jerusalem 91904, Israel.
Nature
|July 22, 2014
まとめ
バクテリアは,再生前のレグタイムを調整し,治療間隔に合わせて最適化することで,抗生物質に対する耐性を進化させます. この適応は"耐性による遅延" (tbl) と呼ばれ,耐性が生まれる前に発生し,高濃度の抗生物質下での細菌の生存に不可欠である.
科学分野:
- 微生物学 微生物学とは
- 進化生物学の進化生物学について
- 遺伝学 遺伝学とは
背景:
- 抗生物質耐性および耐性は,抗生物質ストレスに対する重要な細菌生存戦略ですが,耐性の進化はあまり理解されていません.
- 耐性により,抗生物質の濃度が低い場合でも生長できるが,耐性により,高濃度でも期間限定で生存できる.
研究 の 目的:
- 断続的な,高濃度抗生物質の曝露下での細菌の耐性および耐性の進化を調査する.
- 抗生物質ストレスに対する細菌の適応に関連した遺伝的および現象的変化を特徴づける.
主な方法:
- 高用量抗生物質の断続的な治療の下でバクテリア集団の進化.
- 集団および単細胞レベルでフェノタイプ分析を行い,レイグタイムとレジスタンスに焦点を当てます.
- 観察された現象型に責任を持つ遺伝的変異と標的遺伝子を特定するために,全ゲノム配列決定.
主要な成果:
- 進化したバクテリア菌株は,遺伝子変異によって耐性を得る前に耐性を発達させた.
- 単細胞の遅延時間の有意な増加が観察され,抗生物質曝露間隔に一致するように最適化されました.
- "遅延による耐性" (tbl) フェノタイプが特定され,特定の遺伝子と関連付けられました.
結論:
- ラグタイム最適化は,耐性の進化に先立つ,中断的な高用量抗生物質ストレスに対する主要な適応反応である.
- "遅延による耐性"を理解することは,抗生物質耐性に対抗する戦略を開発する上で極めて重要です.
- 遅延時間調節をターゲットにすることで,抗生物質の有効性を高め,治療失敗を防ぐための新しいアプローチを提供することができます.
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