Tet(X4) - エシェリキア・コライを生産する台湾の孤立種
Wen-Chun Huang1, Yu-Tsung Huang2, Wen-Chien Ko3
1Institute of Molecular Medicine, College of Medicine, National Cheng Kung University, Tainan, Taiwan.
Journal of global antimicrobial resistance
|February 12, 2026
まとめ
エシェリキア・コライ菌における最初のティゲサイクリン耐性遺伝子 (tet(X4) は,台湾で発見され,カーバペネム感受性菌株の移動性プラズミッドに携わっていました. これは,抗生物質耐性遺伝子の継続的な監視の必要性を強調しています.
科学分野:
- 微生物学 微生物学とは
- 遺伝学 遺伝学とは
- 公衆衛生は公衆衛生である.
背景:
- プラズミド媒介のtet (((X4) は,高レベルのティゲサイクリン耐性をもたらし,中国で初めて特定されました.
- エシェリキヤ大腸菌 (E. coli) は,この耐性遺伝子の重要な貯蔵庫として機能しています.
- この研究の前に台湾では,E. coliにおけるテト (X4) の確認された症例は報告されていませんでした.
研究 の 目的:
- 台湾からのティゲサイクリン耐性E. coli単離体におけるtet(X4) の存在と特性を調査する.
- 遺伝子要素とプラズミッドを特定するために,テトを運ぶ (X4).
- 進化の多様性と,TET (X4) の水平遺伝子転送の可能性を理解する.
主な方法:
- 2015年から2022年の間に台湾で収集された81種類のチゲサイクリン耐性E. coli単離体の分析.
- 36の単離物の全ゲノム配列解析により,耐性メカニズムを特定する.
- プラズミドの特徴と,移動性遺伝子の要素の識別.
主要な成果:
- 2つのE. coli単離体 (2.5%) は,新しいプラズミド,pEC1360-1とpEC1638-1.0でtet(X4) を保持していました.
- 移動性ISVsa3-estT-tet ((X4) -ISVsa3 (IETI) 要素) の内部で,テト (X4) 遺伝子が発見されました.
- Tet(X4) は,カルバペネム感受性菌株のみで検出され,以前に報告された中国の菌株とは異なるInc型プラズミッドに位置しました.
結論:
- この研究は,台湾における,特にカルバペネム感受性の単離体における,テト・X4陽性大腸菌の最初の発生を確認している.
- tet(X4) を携わる新しい移動性プラズミドの特定は,水平遺伝子転送のリスクを強調しています.
- tet(X) 遺伝子やその他の重要な抗生物質耐性メカニズムの継続的な監視は,さらなる拡散を防ぐために極めて重要です.
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