Transcription-induced formation of extrachromosomal DNA during yeast ageing.
Extrachromosomal circular DNA (eccDNA) facilitates adaptive evolution by allowing rapid and extensive gene copy number variation and is implicated in the pathology of cancer and ageing.Here, we demonstrate that yeast aged under environmental copper accumulate high levels of 3 nef runes eccDNA containing the copper-resistance gene CUP1.Transcription