{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,28]],"date-time":"2026-10-28T22:58:24Z","timestamp":1793228304326,"version":"4.5.0"},"reference-count":90,"publisher":"American Association for the Advancement of Science (AAAS)","issue":"794","content-domain":{"domain":["www.science.org"],"crossmark-restriction":true},"short-container-title":["Sci. Transl. Med."],"published-print":{"date-parts":[[2025,4,16]]},"abstract":"<jats:p>\n                    Dose-limiting toxicities remain a major barrier to drug development and therapy, revealing the limited predictive power of human genetics. Here, we demonstrate the utility of a more comprehensive approach to studying drug toxicity through longitudinal profiling of the human gut microbiome during colorectal cancer (CRC) treatment (NCT04054908) coupled to cell culture and mouse experiments. Substantial shifts in gut microbial community structure during oral fluoropyrimidine treatment across multiple patient cohorts, in mouse small and large intestinal contents, and in patient-derived ex vivo communities were revealed by 16\n                    <jats:italic>S<\/jats:italic>\n                    rRNA gene sequencing. Metagenomic sequencing revealed marked shifts in pyrimidine-related gene abundance during oral fluoropyrimidine treatment, including enrichment of the\n                    <jats:italic>preTA<\/jats:italic>\n                    operon, which was sufficient for the inactivation of active metabolite 5-fluorouracil (5-FU).\n                    <jats:italic>preTA<\/jats:italic>\n                    <jats:sup>+<\/jats:sup>\n                    bacteria depleted 5-FU in gut microbiota grown ex vivo and in the mouse distal gut. Germ-free and antibiotic-treated mice experienced increased fluoropyrimidine toxicity, which was rescued by colonization with the mouse gut microbiota,\n                    <jats:italic>preTA<\/jats:italic>\n                    <jats:sup>+<\/jats:sup>\n                    <jats:italic>Escherichia coli<\/jats:italic>\n                    , or\n                    <jats:italic>preTA<\/jats:italic>\n                    -high stool from patients with CRC. Last,\n                    <jats:italic>preTA<\/jats:italic>\n                    abundance was negatively associated with fluoropyrimidine toxicity in patients. Together, these data support a causal, clinically relevant interaction between a human gut bacterial operon and the dose-limiting side effects of cancer treatment. Our approach may be generalizable to other drugs, including cancer immunotherapies, and provides valuable insights into host-microbiome interactions in the context of disease.\n                  <\/jats:p>","DOI":"10.1126\/scitranslmed.adq8870","type":"journal-article","created":{"date-parts":[[2025,4,16]],"date-time":"2025-04-16T14:00:51Z","timestamp":1744812051000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":25,"title":["Expansion of a bacterial operon during cancer treatment ameliorates fluoropyrimidine toxicity"],"prefix":"10.1126","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8672-6317","authenticated-orcid":true,"given":"Kai R.","family":"Trepka","sequence":"first","affiliation":[{"name":"Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8851-7853","authenticated-orcid":true,"given":"Wesley A.","family":"Kidder","sequence":"additional","affiliation":[{"name":"Department of Medicine, Division of Hematology and Oncology, University of California, San Francisco, San Francisco, CA 94143, USA."},{"name":"UCSF Helen Diller Family Comprehensive Cancer Center, San Francisco, CA 94158, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7933-8615","authenticated-orcid":true,"given":"Than S.","family":"Kyaw","sequence":"additional","affiliation":[{"name":"Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8601-9949","authenticated-orcid":true,"given":"Taylor","family":"Halsey","sequence":"additional","affiliation":[{"name":"Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5382-1393","authenticated-orcid":true,"given":"Christine A.","family":"Olson","sequence":"additional","affiliation":[{"name":"Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3890-0413","authenticated-orcid":true,"given":"Edwin F.","family":"Ortega","sequence":"additional","affiliation":[{"name":"Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1417-2383","authenticated-orcid":true,"given":"Cecilia","family":"Noecker","sequence":"additional","affiliation":[{"name":"Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7652-1043","authenticated-orcid":true,"given":"Vaibhav","family":"Upadhyay","sequence":"additional","affiliation":[{"name":"Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dalila","family":"Stanfield","sequence":"additional","affiliation":[{"name":"UCSF Helen Diller Family Comprehensive Cancer Center, San Francisco, CA 94158, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5938-9896","authenticated-orcid":true,"given":"Paige","family":"Steiding","sequence":"additional","affiliation":[{"name":"UCSF Helen Diller Family Comprehensive Cancer Center, San Francisco, CA 94158, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9694-7263","authenticated-orcid":true,"given":"Benjamin G. 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