Parp3 promotes long-range end joining in murine cells.

Published on Oct 2, 2018in Proceedings of the National Academy of Sciences of the United States of America9.58
· DOI :10.1073/pnas.1801591115
Jacob V. Layer3
Estimated H-index: 3
(Harvard University),
J. Patrick Cleary2
Estimated H-index: 2
(Harvard University)
+ 15 AuthorsTovah A. Day7
Estimated H-index: 7
(Harvard University)
Chromosomal rearrangements, including translocations, are early and essential events in the formation of many tumors. Previous studies that defined the genetic requirements for rearrangement formation have identified differences between murine and human cells, most notably in the role of classic and alternative nonhomologous end-joining (NHEJ) factors. We reported that poly(ADP)ribose polymerase 3 (PARP3) promotes chromosomal rearrangements induced by endonucleases in multiple human cell types. We show here that in contrast to classic (c-NHEJ) factors, Parp3 also promotes rearrangements in murine cells, including translocations in murine embryonic stem cells (mESCs), class–switch recombination in primary B cells, and inversions in tail fibroblasts that generate Eml4 – Alk fusions. In mESCs, Parp3-deficient cells had shorter deletion lengths at translocation junctions. This was corroborated using next-generation sequencing of Eml4 – Alk junctions in tail fibroblasts and is consistent with a role for Parp3 in promoting the processing of DNA double-strand breaks. We confirmed a previous report that Parp1 also promotes rearrangement formation. In contrast with Parp3, rearrangement junctions in the absence of Parp1 had longer deletion lengths, suggesting that Parp1 may suppress double-strand break processing. Together, these data indicate that Parp3 and Parp1 promote rearrangements with distinct phenotypes.
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