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The Arp2/3 inhibitory protein Arpin inhibits homology-directed DNA repair. | LitMetric
Background Information : Arpin, an Arp2/3 inhibitory protein, inhibits lamellipodial protrusions and cell migration. Arpin expression is lost in tumor cells of several cancer types.Results : Here we analyzed expression levels of Arpin and various markers using Reverse Phase Protein Array (RPPA) in human mammary carcinomas. We found that Arpin protein levels were correlated with those of several DNA damage response markers. Arpin-null cells display enhanced clustering of double stand breaks (DSBs) when cells are treated with a DNA damaging agent, in line with a previously described role of the Arp2/3 complex in promoting DSB clustering for homologous DNA repair (HDR) in the nucleus. Using a specific HDR assay, we further showed that Arpin depletion increased HDR efficiency two-fold through its ability to inactivate the Arp2/3 complex.Conclusions : Arpin regulates both cell migration in the cytosol and HDR in the nucleus.Significance : Loss of Arpin expression coordinates enhanced cell migration with up-regulated DNA repair, which is required when DNA damage is induced by active cell migration.
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