Extrachromosomal circular DNA (eccDNA) is a fascinating genetic element found in both normal and cancerous cells. Unlike the linear DNA typically organized within chromosomes, eccDNA exists as small, circular molecules that can carry genes or regulatory elements. Recent research has highlighted the role of eccDNA in genomic diversity, contributing to gene amplification and expression variability. In cancer cells, eccDNA is often present in higher abundance and can harbor oncogenes, potentially driving tumor progression and drug resistance. Understanding the formation and function of eccDNA provides valuable insights into cellular processes and holds promise for developing novel therapeutic strategies targeting these unique DNA elements.
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