SYCE2 potentiates the steady-state DNA repair activity without affecting the cell cycle checkpoint. SYCE2 potentiates the steady-state DNA repair activity.

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SYCE2 potentiates the steady-state DNA repair activity without affecting the cell cycle checkpoint. SYCE2 potentiates the steady-state DNA repair activity without affecting the cell cycle checkpoint. (A) Schematic representation of SYCE2 mRNA and the siRNA-resistant FLAG-SYCE2 expression vector. The target site of SYCE2 siRNA existing in the 3′ UTR region of SYCE2 mRNA but not existing in the siRNA-resistant FLAG-SYCP3 expression vector is indicated by a horizontal bar. (B) Real-time RT–PCR analysis showing that the endogenous SYCE2 mRNA was successfully knocked down by SYCE2-targeting siRNA existing in the 3′ UTR region and rescued by expression of the siRNA-resistant FLAG-SYCE2 construct in MCF7 cells. The results are expressed relative to those of the MCF7 cells transfected with a nontargeting control siRNA, which were arbitrarily assigned a value of 1.0. Columns and bars represent the mean of three independent experiments and SD, respectively. (C, D) Effect of KU-55933 on increased 53BP1 (C) and RAD51 (D) foci formation, indicating that inhibition of ATM activity abrogates the phenotypes observed in SYCE2-expressing cells. The cells were treated with either DMSO alone or 10 μM KU-55933 dissolved in DMSO for 24 h, then irradiated with 8-Gy x-ray or left unirradiated, and subjected to immunofluorescence 2 h later. Percentages of cells containing three or more large 53BP1 foci (C) and more than five large RAD51 foci (D) are indicated. Columns and bars represent the mean of three independent experiments and SD, respectively. (E) Western blot analysis showing that no effects of SYCE2 expression were detected in the levels of phosphorylation of Chk2 on Thr 68 or p53 on Ser 15, or on the total protein levels of Chk2 and p53. 30 μg of total cell lysates of mock cells and RPE cells stably expressing FLAG-SYCE2, unirradiated or irradiated with 8-Gy x-ray 30 min before harvesting, was subjected to Western blotting analysis using the anti-phospho-Chk2 (Thr 68) antibody, anti-Chk2 antibody, anti-phospho-p53 (Ser 15) antibody, anti-p53 antibody, and anti-CDK2 antibody as an internal control. Noriko Hosoya et al. LSA 2018;1:e201800021 © 2018 Hosoya et al.