Link to bioRxiv paper: http://biorxiv.org/cgi/content/short/2020.09.29.318055v1?rss=1 Authors: Cantres-Velez, J., Blaize, J., Vierra, D., Boisvert, R., Garzon, J., Piraino, B., Tan, W., Deans, A., Howlett, N. G. Abstract: Fanconi anemia (FA) is a rare genetic disease characterized by increased risk for bone marrow failure and cancer. The FA proteins function together to repair damaged DNA. A central step in the activation of the FA pathway is the monoubiquitination of the FANCD2 and FANCI proteins under conditions of cellular stress and during S-phase of the cell cycle. The regulatory mechanisms governing S-phase monoubiquitination, in particular, are poorly understood. In this study, we have identified a CDK regulatory phospho-site (S592) proximal to the site of FANCD2 monoubiquitination. FANCD2 S592 phosphorylation was detected by LC-MS/MS and by immunoblotting with a S592 phospho-specific antibody. Mutation of S592 leads to abrogated monoubiquitination of FANCD2 during S-phase. Furthermore, FA-D2 ( FANCD2 -/- ) patient cells expressing S592 mutants display reduced proliferation under conditions of replication stress and increased mitotic aberrations, including micronuclei and multinucleated cells. Our findings describe a novel cell cycle-specific regulatory mechanism for the FANCD2 protein that promotes mitotic fidelity. Copy rights belong to original authors. Visit the link for more info