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Restoration of G1 chemo/radioresistance and double-strand-break repair proficiency by wild-type but not endonuclease-deficient Artemis

Journal Article · · Nucleic Acids Research
DOI:https://doi.org/10.1093/nar/gkr257· OSTI ID:1625488
 [1];  [2];  [2];  [2];  [3]
  1. Virginia Commonwealth Univ., Richmond, VA (United States); DOE/OSTI
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Virginia Commonwealth Univ., Richmond, VA (United States)

Deficiency in Artemis is associated with lack of V(D)J recombination, sensitivity to radiation and radiomimetic drugs, and failure to repair a subset of DNA double-strand breaks (DSBs). Artemis harbors an endonuclease activity that trims both 5' - and 3' -ends of DSBs. To examine whether endonucleolytic trimming of terminally blocked DSBs by Artemis is a biologically relevant function, Artemis deficient fibroblasts were stably complemented with either wild-type Artemis or an endonuclease deficient D165N mutant. Wild-type Artemis completely restored resistance to $$\gamma$$-rays, bleomycin and neocarzinostatin, and also restored DSB-repair proficiency in G0/G1 phase as measured by pulsed field gel electrophoresis and repair focus resolution. In contrast, cells expressing the D165N mutant, even at very high levels, remained as chemo/ radiosensitive and repair deficient as the parental cells, as evidenced by persistent $$\gamma$$-H2AX, 53BP1 and Mre11 foci that slowly increased in size and ultimately became juxtaposed with promyelocytic leukemia protein nuclear bodies. In normal fibroblasts, overexpression of wild-type Artemis increased radio resistance, while D165N overexpression conferred partial repair deficiency following high dose radiation. Restoration of chemo/radio resistance by wild-type, but not D165N Artemis suggests that the lack of endonucleolytic trimming of DNA ends is the principal cause of sensitivity to double strand cleaving agents in Artemis-deficient cells.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division; National Cancer Institute (NCI); National Institutes of Health (NIH)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1625488
Journal Information:
Nucleic Acids Research, Journal Name: Nucleic Acids Research Journal Issue: 15 Vol. 39; ISSN 0305-1048
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (8)

Elevated expression of artemis in human fibroblast cells is associated with cellular radiosensitivity and increased apoptosis journal October 2012
Structure-Specific nuclease activities of Artemis and the Artemis: DNA-PKcs complex journal May 2016
TDP1 suppresses mis-joining of radiomimetic DNA double-strand breaks and cooperates with Artemis to promote optimal nonhomologous end joining journal August 2018
The Interaction of the Metallo-Glycopeptide Anti-Tumour Drug Bleomycin with DNA journal May 2018
Processing of Damaged DNA Ends for Double-Strand Break Repair in Mammalian Cells journal January 2012
Involvement of p53 in the Repair of DNA Double Strand Breaks: Multifaceted Roles of p53 in Homologous Recombination Repair (HRR) and Non-Homologous End Joining (NHEJ) book January 2014
Modeling the interplay between DNA-PK, Artemis, and ATM in non-homologous end-joining repair in G1 phase of the cell cycle journal February 2019
Effects of hyperthermia on DNA repair pathways: one treatment to inhibit them all journal August 2015

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