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Related Experiment Video

Updated: Nov 25, 2025

Detecting Somatic Genetic Alterations in Tumor Specimens by Exon Capture and Massively Parallel Sequencing
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Reliable detection of somatic mutations in solid tissues by laser-capture microdissection and low-input DNA

Peter Ellis1,2, Luiza Moore1, Mathijs A Sanders1,3

  • 1Cancer, Ageing and Somatic Mutation (CASM), Wellcome Sanger Institute, Hinxton, UK.

Nature Protocols
|December 15, 2020
PubMed
Summary

This study presents a new workflow for sequencing genomes from small cell populations in healthy tissues. The method combines laser-capture microdissection with low-input genome sequencing to study somatic mutations and aging.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Aging Research

Background:

  • Somatic mutations accumulate with age in healthy tissues, contributing to cancer and aging.
  • Studying these mutations in non-neoplastic tissues is crucial for understanding aging and disease.
  • Existing methods may not be suitable for analyzing small cell populations from tissue sections.

Purpose of the Study:

  • To develop and describe a comprehensive workflow for sequencing genomes from small cell populations.
  • To enable the study of somatic mutations in non-neoplastic human tissues.
  • To provide a WGA-free (whole-genome amplification-free) protocol for low-input DNA sequencing.

Main Methods:

  • The workflow integrates laser-capture microdissection (LCM) with low-input genome sequencing.
  • It avoids whole-genome amplification (WGA) by using enzymatic fragmentation for library generation.
  • The protocol includes tissue processing, LCM, low-input library preparation, and mutation calling/filtering.

Main Results:

  • The workflow successfully sequences genomes from small cell populations (100-1,000 cells) in microbiopsies.
  • It has been applied to thousands of samples across diverse human tissues.
  • The protocol is compatible with standard sequencing facility equipment and liquid handling platforms.

Conclusions:

  • This WGA-free, low-input DNA sequencing protocol facilitates the study of somatic mutations in aging and disease.
  • The method provides a robust approach for analyzing genomic alterations in non-neoplastic tissues.
  • The workflow can be completed in 1-3 weeks, making it accessible for research.