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While previous studies on canine DLBCL (cDLBCL) have significantly advanced our understanding of the disease, the majority of this research has relied on whole-exome sequencing, which is limited in its ability to detect copy number aberrations and other genomic changes beyond coding regions. Furthermore, many of these studies lack sufficient clinical follow-up data, making it difficult to draw meaningful associations between genetic variants and patient outcomes. Our study aimed to characterize the mutational landscape of cDLBCL using whole-genome sequencing of matched tumor-normal samples obtained from a cohort of 43 dogs previously enrolled in a clinical trial for which longitudinal follow-up was available. We focused on identifying genes that were significantly or recurrently mutated with coding point mutations, copy number aberrations, and their associations with patient outcomes. We identified 26 recurrently mutated genes, 18 copy number gains, and 8 copy number losses. Consistent with prior studies, the most commonly mutated genes included\n                    <jats:italic>TRAF3<\/jats:italic>\n                    ,\n                    <jats:italic>FBXW7<\/jats:italic>\n                    ,\n                    <jats:italic>POT1<\/jats:italic>\n                    ,\n                    <jats:italic>TP53<\/jats:italic>\n                    ,\n                    <jats:italic>SETD2<\/jats:italic>\n                    ,\n                    <jats:italic>DDX3X<\/jats:italic>\n                    and\n                    <jats:italic>TBL1XR1.<\/jats:italic>\n                    The most prominent copy number gain occurred on chromosome 13, overlapping key oncogenes such as\n                    <jats:italic>MYC<\/jats:italic>\n                    and\n                    <jats:italic>KIT<\/jats:italic>\n                    , while the most frequent deletion was a focal loss on chromosome 26, encompassing\n                    <jats:italic>IGL<\/jats:italic>\n                    ,\n                    <jats:italic>PRAME<\/jats:italic>\n                    ,\n                    <jats:italic>GNAZ<\/jats:italic>\n                    ,\n                    <jats:italic>RAB36<\/jats:italic>\n                    ,\n                    <jats:italic>RSPH14<\/jats:italic>\n                    , and\n                    <jats:italic>ZNF280B<\/jats:italic>\n                    . Notably, our set of recurrently mutated genes was significantly enriched with genes involved in epigenetic regulation. In particular, we identified hotspot mutations in two histone genes,\n                    <jats:italic>H3C8<\/jats:italic>\n                    , and\n                    <jats:italic>LOC119877878<\/jats:italic>\n                    , resulting in H3K27M alterations predicted to dysregulate gene expression. Finally, a survival analysis revealed that H3K27M mutations in\n                    <jats:italic>H3C8<\/jats:italic>\n                    were associated with increased hazard ratios for progression-free survival. No copy number aberrations were associated with survival. These findings underscore the critical role of epigenetic dysregulation in cDLBCL and affirm the dog as a relevant large animal model for interrogating the biological activity of novel histone-modifying treatment strategies.\n                  <\/jats:p>","DOI":"10.1038\/s41598-025-89245-0","type":"journal-article","created":{"date-parts":[[2025,2,8]],"date-time":"2025-02-08T02:54:36Z","timestamp":1738983276000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Characterization of the genomic landscape of canine diffuse large B-cell lymphoma reveals recurrent H3K27M mutations linked to progression-free survival"],"prefix":"10.1038","volume":"15","author":[{"given":"Anna Darlene","family":"van der Heiden","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Raphaela","family":"Pensch","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sophie","family":"Agger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Heather L.","family":"Gardner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William","family":"Hendricks","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Victoria","family":"Zismann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shukmei","family":"Wong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Natalia","family":"Briones","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bryce","family":"Turner","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karin","family":"Forsberg-Nilsson","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cheryl","family":"London","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kerstin","family":"Lindblad-Toh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maja Louise","family":"Arendt","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,2,8]]},"reference":[{"key":"89245_CR1","doi-asserted-by":"crossref","unstructured":"Meuten, D. 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