Disparate Pathways for Extrachromosomal DNA Biogenesis and Genomic DNA Repair

染色体外DNA生物合成和基因组DNA修复的不同途径

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作者:John C Rose,Julia A Belk,Ivy Tsz-Lo Wong,Jens Luebeck,Hudson T Horn,Bence Daniel,Matthew G Jones,Kathryn E Yost,King L Hung,Kevin S Kolahi,Ellis J Curtis,Calvin J Kuo,Vineet Bafna,Paul S Mischel,Howard Y Chang

Abstract

Our study harnesses a CRISPR-based method to examine ecDNA biogenesis, uncovering efficient circularization between double-strand breaks. ecDNAs and their corresponding chromosomal scars can form via nonhomologous end joining or microhomology-mediated end joining, but the ecDNA and scar formation processes are distinct. Based on our findings, we establish a mechanistic model of excisional ecDNA formation.

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