Polyclonal origins of human premalignant colorectal lesions
Cancer is generally thought to be caused by expansion of a single mutant cell . However, analyses of early colorectal cancer lesions suggest that tumors may instead originate from multiple, genetically distinct cell populations . Detecting polyclonal tumor initiation is challenging in patients, as i...
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| Vydáno v: | Nature (London) |
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| Médium: | Journal Article |
| Jazyk: | angličtina |
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England
25.11.2025
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| ISSN: | 0028-0836, 1476-4687, 1476-4687 |
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| Abstract | Cancer is generally thought to be caused by expansion of a single mutant cell
. However, analyses of early colorectal cancer lesions suggest that tumors may instead originate from multiple, genetically distinct cell populations
. Detecting polyclonal tumor initiation is challenging in patients, as it requires profiling early-stage lesions before clonal sweeps obscure diversity. To investigate this, we analyzed normal colorectal mucosa, benign and dysplastic premalignant polyps, and malignant adenocarcinomas (123 samples) from six individuals with familial adenomatous polyposis (FAP). Individuals with FAP have a germline heterozygous APC mutation, predisposing them to colorectal cancer and numerous premalignant polyps by early adulthood
. Whole-genome and/or whole-exome sequencing revealed that many premalignant polyps-40% with benign histology and 28% with dysplasia-were composed of multiple genetic lineages that diverged early, consistent with polyclonal origins. This conclusion was reinforced by whole-genome sequencing of single crypts from multiple polyps in additional patients which showed limited sharing of mutations among crypts within the same lesion. In some cases, multiple distinct APC mutations co-existed in different lineages of a single polyp, consistent with polyclonality. These findings reshape our understanding of early neoplastic events, demonstrating that tumor initiation can arise from the convergence of diverse mutant clones. They also suggest that cell-intrinsic growth advantages alone may not fully explain tumor initiation, highlighting the importance of microenvironmental and tissue-level factors in early cancer evolution. |
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| AbstractList | Cancer is generally thought to be caused by expansion of a single mutant cell1. However, analyses of early colorectal cancer lesions suggest that tumors may instead originate from multiple, genetically distinct cell populations2,3. Detecting polyclonal tumor initiation is challenging in patients, as it requires profiling early-stage lesions before clonal sweeps obscure diversity. To investigate this, we analyzed normal colorectal mucosa, benign and dysplastic premalignant polyps, and malignant adenocarcinomas (123 samples) from six individuals with familial adenomatous polyposis (FAP). Individuals with FAP have a germline heterozygous APC mutation, predisposing them to colorectal cancer and numerous premalignant polyps by early adulthood4. Whole-genome and/or whole-exome sequencing revealed that many premalignant polyps-40% with benign histology and 28% with dysplasia-were composed of multiple genetic lineages that diverged early, consistent with polyclonal origins. This conclusion was reinforced by whole-genome sequencing of single crypts from multiple polyps in additional patients which showed limited sharing of mutations among crypts within the same lesion. In some cases, multiple distinct APC mutations co-existed in different lineages of a single polyp, consistent with polyclonality. These findings reshape our understanding of early neoplastic events, demonstrating that tumor initiation can arise from the convergence of diverse mutant clones. They also suggest that cell-intrinsic growth advantages alone may not fully explain tumor initiation, highlighting the importance of microenvironmental and tissue-level factors in early cancer evolution.Cancer is generally thought to be caused by expansion of a single mutant cell1. However, analyses of early colorectal cancer lesions suggest that tumors may instead originate from multiple, genetically distinct cell populations2,3. Detecting polyclonal tumor initiation is challenging in patients, as it requires profiling early-stage lesions before clonal sweeps obscure diversity. To investigate this, we analyzed normal colorectal mucosa, benign and dysplastic premalignant polyps, and malignant adenocarcinomas (123 samples) from six individuals with familial adenomatous polyposis (FAP). Individuals with FAP have a germline heterozygous APC mutation, predisposing them to colorectal cancer and numerous premalignant polyps by early adulthood4. Whole-genome and/or whole-exome sequencing revealed that many premalignant polyps-40% with benign histology and 28% with dysplasia-were composed of multiple genetic lineages that diverged early, consistent with polyclonal origins. This conclusion was reinforced by whole-genome sequencing of single crypts from multiple polyps in additional patients which showed limited sharing of mutations among crypts within the same lesion. In some cases, multiple distinct APC mutations co-existed in different lineages of a single polyp, consistent with polyclonality. These findings reshape our understanding of early neoplastic events, demonstrating that tumor initiation can arise from the convergence of diverse mutant clones. They also suggest that cell-intrinsic growth advantages alone may not fully explain tumor initiation, highlighting the importance of microenvironmental and tissue-level factors in early cancer evolution. Cancer is generally thought to be caused by expansion of a single mutant cell . However, analyses of early colorectal cancer lesions suggest that tumors may instead originate from multiple, genetically distinct cell populations . Detecting polyclonal tumor initiation is challenging in patients, as it requires profiling early-stage lesions before clonal sweeps obscure diversity. To investigate this, we analyzed normal colorectal mucosa, benign and dysplastic premalignant polyps, and malignant adenocarcinomas (123 samples) from six individuals with familial adenomatous polyposis (FAP). Individuals with FAP have a germline heterozygous APC mutation, predisposing them to colorectal cancer and numerous premalignant polyps by early adulthood . Whole-genome and/or whole-exome sequencing revealed that many premalignant polyps-40% with benign histology and 28% with dysplasia-were composed of multiple genetic lineages that diverged early, consistent with polyclonal origins. This conclusion was reinforced by whole-genome sequencing of single crypts from multiple polyps in additional patients which showed limited sharing of mutations among crypts within the same lesion. In some cases, multiple distinct APC mutations co-existed in different lineages of a single polyp, consistent with polyclonality. These findings reshape our understanding of early neoplastic events, demonstrating that tumor initiation can arise from the convergence of diverse mutant clones. They also suggest that cell-intrinsic growth advantages alone may not fully explain tumor initiation, highlighting the importance of microenvironmental and tissue-level factors in early cancer evolution. |
| Author | Ma, Zhicheng Becker, Winston R. Jiang, Lihua Chan, Joanne Horning, Aaron M. Snyder, Michael P. Van Egeren, Debra Monte, Emma Curtis, Christina Wu, Si Bahmani, Bahareh Ladabaum, Uri Kundaje, Anshul Barapour, Nasim Khan, Aziz Laquindanum, Rozelle Guha, Tuhin K. Michael, Basil Greenleaf, William J. He, Zhen Ford, James M. Zhang, Hao Karathanos, Thomas V. Weiß, Clemens L. Jian, Ruiqi Ellenberger, Mathew Shen, Jeanne Mo, Shanlan Chiu, Roxanne Hu, Zheng Contrepois, Kévin Lee, Hayan Weimer, Annika K. Esplin, D. Glen Schenck, Ryan O. Esplin, Edward D. Mills, Meredith A. Chaib, Hassan Lancaster, Samuel Hanson, Casey Nevins, Stephanie A. Longacre, Teri A. |
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. However, analyses of early colorectal cancer lesions suggest that tumors may... Cancer is generally thought to be caused by expansion of a single mutant cell1. However, analyses of early colorectal cancer lesions suggest that tumors may... |
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| Title | Polyclonal origins of human premalignant colorectal lesions |
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