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ALG-2 (apoptosis-linked gene-2 encoded protein) has been shown to be upregulated in a variety of human tumors questioning its previously assumed pro-apoptotic function. The aim of the present study was to obtain insights into the role of ALG-2 in human cancer cells. We show that ALG-2 downregulation induces accumulation of HeLa cells in the G2/M cell cycle phase and increases the amount of early apoptotic and dead cells. Caspase inhibition by the pan-caspase inhibitor zVAD-fmk attenuated the increase in the amount of dead cells following ALG-2 downregulation. Thus, our results indicate that ALG-2 has an anti-apoptotic function in HeLa cells by facilitating the passage through checkpoints in the G2/M cell cycle phase.
Following DNA damage cells initiate cell cycle checkpoints to allow time to repair sustained lesions. Rad9, Rad1, and Hus1 proteins form a toroidal complex, termed the 9-1-1 complex, that is involved in checkpoint signaling. 9-1-1 shares high structural similarity to the DNA replication protein proliferating cell nuclear antigen (PCNA) and 9-1-1 has been shown in vitro to stimulate steps of the repair process known as long patch base excision repair. Using a system that allows conditional repression of the Rad9 protein in human cell culture, we show that Rad9, and by extension, the 9-1-1 complex, enhances cell survival, is required for efficient exit from G2-phase arrest, and stimulates the repair of damaged DNA following ionizing radiation. These data provide in vivo evidence that the human 9-1-1 complex participates in DNA repair in addition to its previously described role in DNA damage sensing.
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