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Related Experiment Video

Updated: May 20, 2025

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A redefined InDel taxonomy provides insights into mutational signatures.

Gene Ching Chiek Koh1,2,3, Arjun Scott Nanda1,2, Giuseppe Rinaldi1,2

  • 1Department of Genomic Medicine, School of Clinical Medicine, University of Cambridge, Cambridge, UK.

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Researchers developed a new method to classify small insertion and deletion (InDel) mutations, revealing unique mutational signatures in cancer. This advance aids in understanding DNA repair defects and may improve cancer immunotherapy selection.

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Area of Science:

  • Genetics
  • Genomics
  • Cancer Biology

Background:

  • Small insertions and deletions (InDels) are significant mutational events but are less studied than substitutions.
  • Existing InDel classification frameworks struggle to differentiate signatures from background mutagenesis.

Purpose of the Study:

  • To develop a novel InDel classification system to better characterize mutational footprints.
  • To identify InDel signatures associated with postreplicative repair dysfunction (PRRd).

Main Methods:

  • Generated isogenic CRISPR-edited human cellular models for PRRd, including DNA mismatch repair (MMR) and replicative polymerase (Pol ε, Pol δ) gene edits.
  • Developed an alternative InDel classification system considering flanking sequences and motifs.
  • Analyzed seven tumor types from the 100,000 Genomes Project.

Main Results:

  • Revealed unique and diverse InDel mutational footprints.
  • The new classification system enabled unambiguous InDel categorization into 89 subtypes.
  • Identified 37 InDel signatures in tumors, with 27 being novel.
  • Developed PRRDetect, a classifier for PRRd status in tumors.

Conclusions:

  • The novel InDel classification system effectively discriminates mutational signatures.
  • Discovered new InDel signatures linked to PRRd, offering biological insights.
  • PRRDetect shows potential for improving patient selection for immunotherapies.