3cb1b162bdc57a6747c9b4646400e295 AntAgeChe_a2026v70ne01948-25.pdf c3993cd530c25be5ead1b4cf2cbdf2e724e58785 AntAgeChe_a2026v70ne01948-25.pdf 962e2eb68f3df9724c2ab8efda2d334699513305c86d51384b4bb2d910d4d666 AntAgeChe_a2026v70ne01948-25.pdf Title: Single point mutations in global regulatory genes restore cephalosporin resistance in a low-MIC Enterococcus faecium natural isolate Subject: Antimicrob Agents Chemother 2026.70:e01948-25 Keywords: ampicillin-susceptible Enterococcus faecium, cephalosporin intrinsic resistance, CroS, NusG, RpoB, PBP5 Author: Miquel Sánchez-Osuna, Paula Bierge, Inmaculada Gómez-Sánchez, Judith Guitart-Matas, Víctor Monsálvez, Patricia Rabanal, Ana P. Pereira, Ana R. Freitas, Luisa Peixe, Mateu Espasa, Oriol Gasch, Carla Novais, Oscar Q. Pich Creator: Antenna House XSL Formatter V7.4 MR2 Linux : 7.4.3.63807 (2024-03-22T11:49+09) Producer: Antenna House PDF Output Library 7.4.1901 CreationDate: Mon Apr 27 11:18:28 2026 CEST ModDate: Mon Apr 27 11:18:28 2026 CEST Custom Metadata: yes Metadata Stream: yes Tagged: yes UserProperties: no Suspects: no Form: none JavaScript: no Pages: 16 Encrypted: no Page size: 585 x 783 pts Page rot: 0 File size: 5948307 bytes Optimized: no PDF version: 1.7 name type encoding emb sub uni object ID ------------------------------------ ----------------- ---------------- --- --- --- --------- HFZPAS+MyriadPro-Regular Type 1C Custom yes yes yes 16 0 HFZPAS+MyriadPro-Semibold Type 1C Custom yes yes yes 19 0 HFZPAS+MyriadPro-SemiboldIt Type 1C Custom yes yes yes 21 0 HFZPAS+MyriadPro-Regular Type 1C Custom yes yes yes 93 0 HFZPAS+MyriadPro-It Type 1C Custom yes yes yes 105 0 HFZPAS+MyriadPro-Bold Type 1C Builtin yes yes yes 171 0 HFZPAS+MyriadPro-Light Type 1C Custom yes yes yes 175 0 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IncrementalUpdates: 0 DocumentCatalog: ViewerPreferences: HideToolbar: false HideMenubar: false HideWindowUI: false FitWindow: false CenterWindow: false DisplayDocTitle: true NonFullScreenPageMode: UseNone Direction: L2R ViewArea: CropBox ViewClip: CropBox PrintArea: CropBox PageClip: CropBox PageLayout: SinglePage PageMode: UseNone Language: EN Outlines: Item: Title: Single point mutations in global regulatory genes restore cephalosporin resistance in a low-MIC Enterococcus faecium natural isolate Children: Item: Title: MATERIALS AND METHODS Children: Item: Title: Isolation and clinical context of the E. faecium Efm5 strain Item: Title: Antibiotic susceptibility testing Item: Title: Recovery of CPH high-MIC isolates Item: Title: Whole-genome sequencing Item: Title: Comparative genomics Item: Title: Growth curves Item: Title: In vitro time kill curves Item: Title: Immunoblotting Item: Title: Transcriptional and transcriptomic analysis Item: Title: Electron microscopy Item: Title: RESULTS Children: Item: Title: Low cephalosporin MICs observed in Enterococcus faecium Efm5 isolate Item: Title: Single-point mutations drive cephalosporin high-MIC variants of Enterococcus faecium Efm5 Item: Title: Differential growth of Enterococcus faecium Efm5 and high-MIC variants Item: Title: Increased PBP5 expression in CPH high-MIC variants Item: Title: Global functional and metabolic reprogramming in CPH high-MIC variants Item: Title: Distinct ultrastructural features in E. faecium Efm5 and cephalosporin high-MIC variants Item: Title: DISCUSSION Filters: FilterPipeline: FlateDecode FilterPipeline: DCTDecode Images: Image: NisoImageMetadata: FormatName: image/png ImageWidth: 32 ImageHeight: 51 ColorSpace: RGB BitsPerSample: 8 BitsPerSampleUnit: integer Filter: FlateDecode Image: NisoImageMetadata: FormatName: image/jpg CompressionScheme: JPEG ImageWidth: 930 ImageHeight: 136 ColorSpace: RGB BitsPerSample: 8 BitsPerSampleUnit: integer Image: NisoImageMetadata: FormatName: 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HFZPAS+MyriadPro-Light Flags: Nonsymbolic FontBBox: -153, -250, 1046, 935 FontFile3: true EncodingDictionary: Differences: true ToUnicode: true CIDFontType2: Font: BaseFont: HFZPAS+NotoSansMath-Regular CIDSystemInfo: Registry: Adobe Registry: Identity Supplement: 0 FontDescriptor: FontName: HFZPAS+NotoSansMath-Regular Flags: Symbolic FontBBox: -354, -420, 1695, 1069 FontFile2: true XMP: application/pdfSingle point mutations in global regulatory genes restore cephalosporin resistance in a low-MIC Enterococcus faecium natural isolateAAC01948-25Miquel Sánchez-OsunaPaula BiergeInmaculada Gómez-SánchezJudith Guitart-MatasVíctor MonsálvezPatricia RabanalAna P. PereiraAna R. FreitasLuisa PeixeMateu EspasaOriol GaschCarla NovaisOscar Q. PichMiquel Sánchez-OsunaPaula BiergeInmaculada Gómez-SánchezJudith Guitart-MatasVíctor MonsálvezPatricia RabanalAna P. PereiraAna R. FreitasLuisa PeixeMateu EspasaOriol GaschCarla NovaisOscar Q. PichAmerican Society for MicrobiologyCopyright © 2026 Sánchez-Osuna et al.This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license.20262023Enterococcus faecium exhibits intrinsic resistance to cephalosporins (CPHs), yet the genetic determinants of this phenotype remain incompletely understood. To date, E. faecium strains with low minimum inhibitory concentrations (MICs) of CPH have only been described following genetic manipulation. At Parc Taulí University Hospital, we identified a clinical isolate of ampicillin-susceptible E. faecium (Efm5) that exhibited unusually low MICs to cefotaxime (1 mg/L), ceftriaxone (3 mg/L), and ceftaroline (0.19 mg/L). Upon single exposure to ceftriaxone (100 mg/L), Efm5 rapidly yielded variants with markedly increased MICs of ceftriaxone (>256 mg/L) and cefotaxime (>32 mg/L), while MICs of ampicillin and ceftaroline were unaffected. Whole-genome sequencing revealed that the high-MIC variants carried single-nucleotide polymorphisms leading to non-synonymous mutations in croS, nusG, or rpoB genes. Phenotypic assays confirmed that these mutations were associated with ceftriaxone resistance, and immunoblots revealed increased expression of penicillin-binding protein 5 (PBP5) in all the high-MIC variants. Transcriptional profiling showed upregulation of the pbp5 operon, which includes ftsW, psr, and pbp5, in the croS variants. This study provides evidence that E. faecium isolates with low MICs to CPH can arise in clinical settings without laboratory manipulation, enabling further investigation of resistance pathways.20260105202602110066-4804uuid:137ae4ad-1393-4844-80e3-86e8ec945111uuid:3dd04bd2-58a1-40cb-be8a-105c5b2bc25a Antenna House PDF Output Library 7.4.1901 Antenna House XSL Formatter V7.4 MR2 Linux : 7.4.3.63807 (2024-03-22T11:49+09) 2026-04-27T09:18:28+00:00 2026-04-27T09:18:28+00:00 2026-04-27T09:18:28+00:00 e94ab84f-6ee4-4c81-b2eb-e9becff2085e 1 Pages: Page: Sequence: 1 Annotations: Annotation: Subtype: Link Contents: CrossMarkLogoLink Rect: 505, 701, 544, 742 LastModified: D:20260427091828+00'00' Flags: Print Annotation: Subtype: Link Contents: 10.1128/aac.01948-25 Rect: 468, 23, 534, 32 LastModified: D:20260427091828+00'00' Flags: Print Annotation: Subtype: Link Contents: ExternalLinking Rect: 391, 47, 536, 65 LastModified: D:20260427091828+00'00' Flags: Print Annotation: Subtype: Link Contents: 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