{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"medRxiv"}],"indexed":{"date-parts":[[2026,4,18]],"date-time":"2026-04-18T00:57:55Z","timestamp":1776473875938,"version":"3.51.2"},"posted":{"date-parts":[[2026,4,15]]},"group-title":"Genetic and Genomic Medicine","reference-count":81,"publisher":"openRxiv","license":[{"start":{"date-parts":[[2026,4,15]],"date-time":"2026-04-15T00:00:00Z","timestamp":1776211200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2026,4,15]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                <jats:p>\n                  Colorectal cancer (CRC) is the second leading cause of cancer death globally and the number one cause of cancer death in people under 50 years old. The reasons for the rise of early-onset CRC are unknown, and while anatomically distinct subtypes of CRC have substantial clinical and molecular associations, the etiology of region-specific disease, such as early-onset CRC\u2019s enrichment in the distal colon, remains unclear. Understanding regional mutagenesis may identify risk factors for this public health concern and CRC more broadly. To evaluate mutational dynamics across the premalignant colon, we performed whole-genome sequencing of 125 individual colon crypts taken from six standardized regions biopsied during colonoscopy, collected from 11 donors without polyps and 10 with polyps. We observed mutation spectra and accumulation rates consistent with previous whole-organ studies, with greater subclonal mutation capture enabled by experimental design. T&gt;[A,C,G] mutations, which are associated with colibactin genotoxicity from pks+\n                  <jats:italic>Escherichia coli<\/jats:italic>\n                  , were significantly enriched in the rectum of donors with and without polyps (adjusted p-values &lt; 0.01). Moreover, when comparing findings to crypts from individuals with CRC and sequenced CRC tumors, we observed consistent enrichment of the colibactin-associated mutational signature \u201cID18\u201d in the rectum in both normal colon crypts and CRC tumors, without significant difference in colibactin-specific single nucleotide variant or insertion-deletion burden in crypts across the three clinical groups (i.e., no polyp, polyp, and CRC). These findings argue against a causal or prognostic role for colibactin in CRC, instead indicating that the proposed association with early-onset disease reflects anatomic specificity rather than cancer-specific clinical relevance.\n                <\/jats:p>","DOI":"10.64898\/2026.04.13.26350783","type":"posted-content","created":{"date-parts":[[2026,4,15]],"date-time":"2026-04-15T20:40:23Z","timestamp":1776285623000},"source":"Crossref","is-referenced-by-count":0,"title":["Colibactin-associated mutations in the human colon appear to reflect anatomy and early exposure, not oncogenesis"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1321-0325","authenticated-orcid":false,"given":"Laurel","family":"Hiatt","sequence":"first","affiliation":[{"name":"Department of Human Genetics, University of Utah, Salt Lake City, Utah 84112, USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elizabeth 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