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© Deriano Lab / Institut Pasteur
Chromosomes métaphasiques d’une cellule lymphoïde cancéreuse présentant une amplification des gènes Igh et c-myc
Publication : Molecular and cellular biology

Artemis and nonhomologous end joining-independent influence of DNA-dependent protein kinase catalytic subunit on chromosome stability

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Molecular and cellular biology - 17 Nov 2008

Stracker TH, Williams BR, Deriano L, Theunissen JW, Adelman CA, Roth DB, Petrini JH

Link to Pubmed [PMID] – 19015239

Mol. Cell. Biol. 2009 Jan;29(2):503-14

Deficiency in both ATM and the DNA-dependent protein kinase catalytic subunit (DNA-PKcs) is synthetically lethal in developing mouse embryos. Using mice that phenocopy diverse aspects of Atm deficiency, we have analyzed the genetic requirements for embryonic lethality in the absence of functional DNA-PKcs. Similar to the loss of ATM, hypomorphic mutations of Mre11 (Mre11(ATLD1)) led to synthetic lethality when juxtaposed with DNA-PKcs deficiency (Prkdc(scid)). In contrast, the more moderate DNA double-strand break response defects associated with the Nbs1(DeltaB) allele permitted viability of some Nbs1(DeltaB/DeltaB) Prkdc(scid/scid) embryos. Cell cultures from Nbs1(DeltaB/DeltaB) Prkdc(scid/scid) embryos displayed severe defects, including premature senescence, mitotic aberrations, sensitivity to ionizing radiation, altered checkpoint responses, and increased chromosome instability. The known functions of DNA-PKcs in the regulation of Artemis nuclease activity or nonhomologous end joining-mediated repair do not appear to underlie the severe genetic interaction. Our results reveal a role for DNA-PKcs in the maintenance of S/G(2)-phase chromosome stability and in the induction of cell cycle checkpoint responses.

http://www.ncbi.nlm.nih.gov/pubmed/19015239