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Your cells aren't all genetically identical — and scientists are finally getting better at mapping the differences. Researchers at WashU Medicine have validated a suite of genomic tools to accurately detect somatic mutations, the rare DNA changes that accumulate in our cells over a lifetime. These variations are linked to aging and cancer, and understanding them could open new doors for disease prevention.
Your body is more of a genetic patchwork than a uniform blueprint. While most people think of DNA as identical across every cell, the reality is that cells accumulate unique mutations over time — a phenomenon called somatic mosaicism. Researchers at Washington University School of Medicine in St. Louis (WashU Medicine) are leading a national effort to map these changes, and they've just validated the tools needed to do it accurately.
Published across Cell and Cell Genomics as part of the NIH-funded Somatic Mosaicism across Human Tissues (SMaHT) Network, the new studies confirm that three sequencing strategies — bulk sequencing, single-cell sequencing, and duplex sequencing — work best in combination to capture a comprehensive picture of genetic variation across tissues. The team also showed, for the first time, that data from the Human Pangenome Reference Consortium can be used to identify somatic (not just inherited) DNA variants.
Key Takeaways:
Why it matters: Establishing a "reference spectrum" of normal somatic variation is the critical first step toward identifying which mutations drive disease — and potentially finding ways to intervene before illness develops.
