ArticlebioRxiv : the preprint server for biology2025
Mitotic transcription ensures ecDNA inheritance through chromosomal tethering.
Article in bioRxiv : the preprint server for biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Extrachromosomal DNA (ecDNA) are circular DNA bodies that play critical roles in tumor progression and treatment resistance by amplifying oncogenes across a wide range of cancer types. ecDNA lack centromeres and are thus not constrained by typical Mendelian segregation, enabling their unequal accumulation within daughter cells and associated increases in copy number. Despite intrinsic links to their oncogenic potential, the fidelity and mechanisms of ecDNA inheritance are poorly understood. Here, we show that ecDNA are protected against cytosolic mis-segregation through mitotic clustering and by tethering to the telomeric and subtelomeric regions of mitotic chromosomes. ecDNA-chromosome tethering depends on BRD4 transcriptional co-activation and mitotic transcription of the long non-coding RNA
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