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Wang, Yijie; Chen, Yan; Wang, Chenliang; Yang, Mingming; Wang, Yanan; Bao, Lei; Wang, Jennifer E; Kim, BongWoo; Chan, Kara Y; Xu, Weizhi; Capota, Emanuela; Ortega, Janice; Nijhawan, Deepak; Li, Guo-Min; Luo, Weibo; Wang, Yingfei
Nature communications, 05/2021, Letnik: 12, Številka: 1Journal Article
How cancer cells cope with high levels of replication stress during rapid proliferation is currently unclear. Here, we show that macrophage migration inhibitory factor (MIF) is a 3' flap nuclease that translocates to the nucleus in S phase. Poly(ADP-ribose) polymerase 1 co-localizes with MIF to the DNA replication fork, where MIF nuclease activity is required to resolve replication stress and facilitates tumor growth. MIF loss in cancer cells leads to mutation frequency increases, cell cycle delays and DNA synthesis and cell growth inhibition, which can be rescued by restoring MIF, but not nuclease-deficient MIF mutant. MIF is significantly upregulated in breast tumors and correlates with poor overall survival in patients. We propose that MIF is a unique 3' nuclease, excises flaps at the immediate 3' end during DNA synthesis and favors cancer cells evading replication stress-induced threat for their growth.
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in: SICRIS
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