A Distinct Mode of Chromosome-End Genome Instability Revealed by Circulome Characterization and Analyses

Circulome profiling of cancer cell lines and patient tumors shows a consistent enrichment of extrachromosomal circular DNA at chromosome ends, extending up to tens of megabases inward.

• Why it matters: Sequence-only views of genome instability miss topology-linked dynamics, and genome-wide, high-resolution maps of where circular elements arise have lacked scale.
• What they did: The study combined biophysical and biochemical isolation of circular DNA with next-generation sequencing across a cancer panel and patient tumors, using non-cancerous cells and adjacent normal tissues as controls.
• The result: The EDGE pattern, linked to corroborating linear rearrangements, outperforms the mean interior chromosomal regions for classifying bladder tumor versus matched normal tissue on each chromosome.

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