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Mutational signatures in colon cancer
Priyatama Pandey1, Zhi Yang1, Darryl Shibata2
1Department of Preventive Medicine, Keck School of Medicine of the University of Southern California, 2001 N. Soto Street, Los Angeles, CA, 90032, USA.
BMC Research Notes
|December 5, 2019
Summary
Researchers identified six mutational signatures in colon cancer, with two signatures explaining most mutations in normal colon stem cells. Four signatures were specific to hypermutated tumors.
Area of Science:
- Genomics and Cancer Research
- Molecular Biology
- Bioinformatics
Background:
- Tumor sequencing studies frequently identify mutational signatures, which are patterns of somatic base substitutions.
- These signatures can reflect biological processes and cancer risk factors, varying by cancer subtype and environmental exposures.
- Colon cancer presents a unique case due to diverse environmental risk factors across subtypes.
Purpose of the Study:
- To infer and characterize mutational signatures specific to colon cancer.
- To compare colon cancer mutational signatures with those found in normal adult colon stem cells.
- To validate findings against existing literature and independent datasets.
Main Methods:
- Application of a probabilistic mutation signature model to somatic mutation data.
- Analysis of mutations from six adult normal colon stem cells and 431 colon adenocarcinomas.
- Independent validation using data from 295 Chinese colorectal cancer cases.
Main Results:
- Inference of six distinct mutational signatures in colon cancer.
- Four of these signatures were specifically associated with hypermutated tumors.
- Two signatures were sufficient to explain the majority of mutations in normal aging colon stem cells.
- All six identified signatures were independently confirmed in a separate cohort of Chinese colorectal cancers.
Conclusions:
- Colon cancer exhibits a complex landscape of six distinct mutational signatures.
- A subset of signatures is linked to hypermutation, while a minimal set characterizes normal stem cell aging.
- The findings provide a foundation for understanding colon cancer etiology and developing targeted therapies.
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