Abstract PR21: DEK is critical for homologous recombination and its loss is synthetic lethal with DNA-PK inhibition

DEK is a highly conserved chromatin-bound protein whose upregulation across different cancer types directly correlates with genotoxic therapy resistance. While DEK loss induces genome instability and sensitizes cells to DNA double strand breaks (DSBs), suggesting defects in DNA repair, the role of DEK remains incompletely understood. To this end we previously determined that loss of DEK moderately attenuates non-homologous end-joining repair (NHEJ). However, the observed partial decrease in NHEJ activity is likely insufficient to fully explain the sensitivity of DEK-deficient cells to radiation and chemotherapy. Thus, we hypothesized that DEK has additional roles in DSB repair, particularly in homologous recombination (HR) DNA repair, a known contributor to chemotherapy resistance. We found that H2AX activation and HR were strongly compromised in DEK-deficient cells, and that DEK physically interacted with and contributed to RAD51 recruitment. Thus, we hypothesized that DEK-deficient cells likely rely on residual NHEJ for repair of DSBs and survival. Correspondingly, NHEJ inhibition with DNA-PK inhibitors resulted in synthetic lethality in DEK-deficient cells. Together these findings define DEK as an important and multifunctional mediator of homologous recombination.This abstract is also being presented as Poster A09.Citation Format: Eric A. Smith, Boris Gole, Nicholas A. Willis, Krumpelbeck F. Eric, Anil G. Jegga, Abdullah M. Ali, Haihong Guo, Amom R. Meetei, Paul R. Andreas...
Source: Molecular Cancer Research - Category: Cancer & Oncology Authors: Tags: Homologous Recombination Defects: Oral Presentations - Proffered Abstracts Source Type: research