Extrachromosomal Circular DNA: A Mobile Genetic Element Shaping Host Biology

Area of Science:

• Genetics
• Molecular Biology
• Genomics

Background:

• DNA enables genetic information transmission, but sequences change for evolution.
• Mobile genetic elements facilitate genome dynamics and adaptation.
• Extrachromosomal circular DNA (ecDNA) is proposed as a novel class of mobile genetic elements.

Purpose of the Study:

• To review the historical discoveries and conceptual evolution of ecDNA.
• To categorize ecDNA forms, life cycle, and roles across organisms.
• To highlight ecDNA's significance in physiology and pathology, and explore therapeutic strategies.

Main Methods:

• Literature review of historical discoveries and conceptual evolution of ecDNA.
• Categorization of ecDNA forms, biogenesis, maintenance, and clearance.
• Discussion of ecDNA's roles in physiological processes and disease states.
• Exploration of therapeutic strategies targeting ecDNA.

Main Results:

• ecDNA represents a class of mobile genetic elements influencing genome dynamics.
• ecDNA plays roles in development, stress adaptation, and evolution.
• ecDNA is implicated in cancer progression, drug resistance, and viral infections.

Conclusions:

• ecDNA significantly shapes host biology and genome dynamics.
• ecDNA is a critical factor in physiological and pathological processes.
• Targeting ecDNA offers a promising framework for biomedical interventions, particularly in oncology and antiviral treatments.