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Bacteria-to-human protein networks reveal origins of endogenous DNA damage
Ralf B Nehring,
María Angélica Bravo Núñez,
Devon M Fitzgerald,
John P Pribis,
Chenyue W Hu,
Reid T Powell,
Sandra A LaBonte,
Meztli L. Matadamas Guzmán,
Alfred M Lentzsch,
Adam T Szafran,
Mohan C Joshi,
Janet L Gibson,
Ryan L Frisch,
Susan G Hilsenbeck,
James C Hu,
Deborah A Siegele,
Kenneth L Scott,
Michael A Mancini,
Kyle M Miller,
Susan M Rosenberg
Posted 26 Jun 2018
bioRxiv DOI: 10.1101/354589 (published DOI: 10.1016/j.cell.2018.12.008)
Posted 26 Jun 2018
DNA damage provokes mutations and cancer, and results from external carcinogens or endogenous cellular processes. Yet, the intrinsic instigators of DNA damage are poorly understood. Here we identify proteins that promote endogenous DNA damage when overproduced: the DNA-damaging proteins (DDPs). We discover a large network of DDPs in Escherichia coli and deconvolute them into six DNA-damage-causing function clusters, demonstrating DDP mechanisms in three: reactive-oxygen increase by transmembrane transporters, chromosome loss by replisome binding, and replication stalling by transcription factors. Their 284 human homologs are over-represented among known cancer drivers, and their expression in tumors predicts heavy mutagenesis and poor prognosis. Half of tested human homologs, when overproduced in human cells, promote DNA damage and mutation, with DNA-damaging mechanisms like those in E. coli. Together, our work reveals DDP networks that provoke endogenous DNA damage and may indicate functions of many human known and newly implicated cancer-promoting proteins.
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