Extrachromosomal Circular DNAs: Origin, formation and emerging function in Cancer.

Area of Science:

• Molecular Biology
• Genetics
• Cancer Research

Background:

• Cellular DNA in eukaryotes is primarily organized into linear chromosomes.
• Genes also exist on extrachromosomal elements, commonly as circular DNAs called eccDNAs.
• Recent advances illuminate eccDNA biology, with growing interest in their cancer connection.

Purpose of the Study:

• To review the formation, characteristics, and biological significance of eccDNAs.
• To focus on molecular mechanisms of eccDNA roles in cancer progression.
• To discuss potential applications of eccDNAs in cancer detection and treatment.

Main Methods:

• Literature review of current knowledge on eccDNA biology and cancer.
• Analysis of molecular mechanisms underlying eccDNA involvement in cancer.
• Exploration of eccDNA's role in tumor heterogeneity, evolution, and as cell-free biomarkers.

Main Results:

• Gene amplification on eccDNAs is frequent in cancer.
• eccDNAs often carry oncogenes or drug resistance genes, conferring a survival advantage.
• Altered eccDNA levels are observed in cancer patients, correlating with progression and poor outcomes.

Conclusions:

• eccDNAs contribute significantly to tumor heterogeneity and adaptation.
• eccDNAs, identified as cell-free DNA, show promise as novel biomarkers for cancer diagnosis and prognosis.
• Understanding eccDNA function is crucial for analyzing cancer pathogenesis and developing new therapies.