Figure 8. Proposed model of ATR/Chk1‐dependent Ddx19 function.
Activation of ATR by replication stress as a result of conflicts between replication and transcription, or induced by DNA damage (camptothecin, UV‐C, red stars) triggers Ddx19 phosphorylation by Chk1 and weakens its interaction with Nup214. This allows nuclear localization of Ddx19 and R‐loop resolution.