Identification of novel DNA-damage tolerance genes reveals regulation of translesion DNA synthesis by nucleophosmin

Omer Ziv, Amit Zeisel, Nataly Mirlas-Neisberg, Umakanta Swain, Reinat Nevo, Nir Ben-Chetrit, Maria Paola Martelli, Roberta Rossi, Stefan Schiesser, Christine E. Canman, Thomas Carell, Nicholas E. Geacintov, Brunangelo Falini, Eytan Domany, Zvi Livneh

Research output: Contribution to journalArticlepeer-review


Cells cope with replication-blocking lesions via translesion DNA synthesis (TLS). TLS is carried out by low-fidelity DNA polymerases that replicate across lesions, thereby preventing genome instability at the cost of increased point mutations. Here we perform a two-stage siRNA-based functional screen for mammalian TLS genes and identify 17 validated TLS genes. One of the genes, NPM1, is frequently mutated in acute myeloid leukaemia (AML). We show that NPM1 (nucleophosmin) regulates TLS via interaction with the catalytic core of DNA polymerase-n (poln), and that NPM1 deficiency causes a TLS defect due to proteasomal degradation of poln. Moreover, the prevalent NPM1c+ mutation that causes NPM1 mislocalization in ∼30% of AML patients results in excessive degradation of poln. These results establish the role of NPM1 as a key TLS regulator, and suggest a mechanism for the better prognosis of AML patients carrying mutations in NPM1.

Original languageEnglish (US)
Article number5437
JournalNature communications
StatePublished - 2014

ASJC Scopus subject areas

  • General Chemistry
  • General Biochemistry, Genetics and Molecular Biology
  • General Physics and Astronomy


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