Intercellular differences in ecDNA structure pointed to circular recombination as a mechanism of ecDNA evolution. In contrast, other small circular DNAs were exclusive to individual cells, indicating differences in their selection and propagation. Oncogene-containing ecDNAs were clonally present in cancer cells and drove intercellular oncogene expression differences. By applying scEC&T-seq to cancer cells, we describe intercellular differences in ecDNA content while investigating their structural heterogeneity and transcriptional impact. Here we describe single-cell extrachromosomal circular DNA and transcriptome sequencing (scEC&T-seq), a method for parallel sequencing of circular DNAs and full-length mRNA from single cells. Nature Genetics volume 55, pages 880–890 ( 2023) Cite this articleĮxtrachromosomal DNAs (ecDNAs) are common in cancer, but many questions about their origin, structural dynamics and impact on intratumor heterogeneity are still unresolved. Parallel sequencing of extrachromosomal circular DNAs and transcriptomes in single cancer cells

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