{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T13:40:19Z","timestamp":1776865219916,"version":"3.51.2"},"reference-count":58,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2025,3,13]],"date-time":"2025-03-13T00:00:00Z","timestamp":1741824000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"European Regional Development Fund (ERDF)","award":["Programme\u2013COMPETE 2020"],"award-info":[{"award-number":["Programme\u2013COMPETE 2020"]}]},{"name":"European Regional Development Fund (ERDF)","award":["UIDB\/04539\/2020"],"award-info":[{"award-number":["UIDB\/04539\/2020"]}]},{"name":"European Regional Development Fund (ERDF)","award":["UIDP\/04539\/2020"],"award-info":[{"award-number":["UIDP\/04539\/2020"]}]},{"name":"European Regional Development Fund (ERDF)","award":["LA\/P\/0058\/2020"],"award-info":[{"award-number":["LA\/P\/0058\/2020"]}]},{"name":"Foundation for Science and Technology (FCT)","award":["Programme\u2013COMPETE 2020"],"award-info":[{"award-number":["Programme\u2013COMPETE 2020"]}]},{"name":"Foundation for Science and Technology (FCT)","award":["UIDB\/04539\/2020"],"award-info":[{"award-number":["UIDB\/04539\/2020"]}]},{"name":"Foundation for Science and Technology (FCT)","award":["UIDP\/04539\/2020"],"award-info":[{"award-number":["UIDP\/04539\/2020"]}]},{"name":"Foundation for Science and Technology (FCT)","award":["LA\/P\/0058\/2020"],"award-info":[{"award-number":["LA\/P\/0058\/2020"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["CIMB"],"abstract":"<jats:p>Antibiotic resistance in Helicobacter pylori is increasing rapidly and emerging as a major factor in treatment failure. We aimed to identify genetic mutations associated with resistance to clarithromycin (23S rRNA peptidyl transferase), fluoroquinolones (gyrA), and metronidazole (rdxA), and to explore their mechanisms of action through molecular modeling. H. pylori detection and the molecular characterization of genes were conducted directly on gastric biopsies by real-time PCR followed by nucleotide sequencing. A 3D model was used to evaluate molecular interactions between the antibiotics and respective target proteins. H. pylori was identified in 66.7% of 33 patients. An analysis of 23SrRNA revealed novel mutations that, by in silico analysis, do not appear to contribute to clarithromycin resistance. In gyrA, mutations in amino acid residues 87 and 91 had an incidence of 27%, and the in silico analysis revealed that these positions are relevant in the binding and resistance to fluoroquinolones. It is also reported for other mutations, some of which are never described. All rdxA mutations were missense, with R16H, M56V, H97T, G98S, A118T, V123T, and R131K predicted by in silico analysis to impact metronidazole resistance. Monitoring H. pylori gene mutations is crucial for tailoring effective antibiotic therapies. Our study advances personalized medicine by introducing novel methods to detect resistance-related mutations and uncovering the molecular mechanisms driving this resistance.<\/jats:p>","DOI":"10.3390\/cimb47030187","type":"journal-article","created":{"date-parts":[[2025,3,13]],"date-time":"2025-03-13T04:18:32Z","timestamp":1741839512000},"page":"187","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Detection of Helicobacter pylori and the Genotypes of Resistance to Clarithromycin, Fluoroquinolones, and Metronidazole in Gastric Biopsies: An In Silico Analysis to Help Understand Antibiotic Resistance"],"prefix":"10.3390","volume":"47","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6625-2572","authenticated-orcid":false,"given":"Pedro","family":"Valada","sequence":"first","affiliation":[{"name":"CNC-UC\u2014Center for Neurosciences of Coimbra, University of Coimbra, 3000-504 Coimbra, Portugal"},{"name":"CiBB\u2014Centre for Innovative Biomedicine and Biotechnology, University of Coimbra, 3000-504 Coimbra, Portugal"},{"name":"Faculty of Medicine, University of Coimbra, 3000-504 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9508-7035","authenticated-orcid":false,"given":"Ana","family":"Mata","sequence":"additional","affiliation":[{"name":"Coimbra Chemistry Center, Institute of Molecular Sciences (CQC IMS), Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9128-2557","authenticated-orcid":false,"given":"Rui M. M.","family":"Brito","sequence":"additional","affiliation":[{"name":"Coimbra Chemistry Center, Institute of Molecular Sciences (CQC IMS), Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal"},{"name":"BSIM Therapeutics, Instituto Pedro Nunes, 3030-199 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9347-0535","authenticated-orcid":false,"given":"Teresa","family":"Gon\u00e7alves","sequence":"additional","affiliation":[{"name":"CNC-UC\u2014Center for Neurosciences of Coimbra, University of Coimbra, 3000-504 Coimbra, Portugal"},{"name":"CiBB\u2014Centre for Innovative Biomedicine and Biotechnology, University of Coimbra, 3000-504 Coimbra, Portugal"},{"name":"Faculty of Medicine, University of Coimbra, 3000-504 Coimbra, Portugal"}]},{"given":"Jos\u00e9 A.","family":"Medeiros","sequence":"additional","affiliation":[{"name":"Gastroenterology Clinic, 3000-098 Coimbra, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8464-0045","authenticated-orcid":false,"given":"C\u00e9lia","family":"Nogueira","sequence":"additional","affiliation":[{"name":"CNC-UC\u2014Center for Neurosciences of Coimbra, University of Coimbra, 3000-504 Coimbra, Portugal"},{"name":"CiBB\u2014Centre for Innovative Biomedicine and Biotechnology, University of Coimbra, 3000-504 Coimbra, Portugal"},{"name":"Faculty of Medicine, University of Coimbra, 3000-504 Coimbra, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2025,3,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"158","DOI":"10.5455\/javar.2021.h498","article-title":"Gastric histopathological features after the administration of omeprazole; amoxicillin; and clarithromycin in gastritis Helicobacter pylori rat model","volume":"8","author":"Yulizal","year":"2021","journal-title":"J. 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