亜致死性抗生物質曝露は,病原性ビブリオ・パラヘモリチクスにおけるキノロン抵抗性の微進化を誘発する
Qian Wu1,2, Han Yang1,2, Tianming Xu1,2
1College of Food Science and Technology, Shanghai Ocean University, Shanghai 201306, China.
International journal of molecular sciences
|February 13, 2026
まとめ
アクアカルチャーにおける亜致死性抗生物質残留物は,ビブリオ・パラヘモリチカスのキノロン耐性を急速に誘発する. gyrA,parC,およびgyrB遺伝子の重要な変異が,この獲得抵抗を駆動し,海産物の安全性に影響を与えます.
科学分野:
- 微生物学 微生物学とは
- 環境科学 環境科学
- 遺伝学 遺伝学とは
背景:
- 水中の環境は,抗生物質耐性の発生のための貯水池です.
- Vibrio parahaemolyticusは,魚介類が媒介する重要な病原体である.
- キノロン抗生物質は広く使用されており,環境残留につながる.
研究 の 目的:
- Vibrio parahaemolyticusにおけるキノロン抵抗性の微生物進化の経路を調査する.
- 既得抗生物質耐性の基礎となる分子機構を特定する.
- 細菌の適応に対する亜致死性抗生物質圧力の影響を評価する.
主な方法:
- サブレタルのレボフロクサシン濃度を用いたレジスタンスのインビトロ誘導.
- 抗生物質感受性およびバイオフィルム形成のフェノタイプ分析.
- 遺伝子変異を特定するための全ゲノム配列解析.
主要な成果:
- レボフロクサシン誘導により,アンピシリンとシプロフロクサシンに交叉耐性を持つ耐性変異体 (VPD14M) が発生した.
- ミュータントは成長率が低下し,バイオフィルム形成が強化された.
- キノロン抵抗性決定領域 (QRDRs) の内にある gyrA (Ser83Ile),parC (Ser85Phe),および gyrB (Pro748Ser) のキーポイント変異が特定されました.
結論:
- 亜致死性キノロン抗生物質のレベルは,ビブリオ・パラヘモリチカスの耐性を急速に誘発する.
- 特定のQRDR変異は,獲得キノロン抵抗性の重要な要因である.
- 発見は,海産物および水産養殖環境における抗生物質耐性の監視を強化することを支持しています.
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