bioRxiv preprint doi: https://doi.org/10.1101/2021.04.13.439318; this version posted April 13, 2021. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY-NC-ND 4.0 International license. 1 DDX21 is a p38-MAPK sensitive nucleolar protein necessary 2 for mouse preimplantation embryo development and cell-fate 3 specification. 4 Pablo Bora1,*, Lenka Gahurova1,2, Andrea Hauserova1, Martina Stiborova1, Rebecca Collier1, David 5 Potěšil3, Zbyněk Zdráhal3 and Alexander W. Bruce1,* 6 1. Laboratory of Early Mammalian Developmental Biology (LEMDB), Department of Molecular 7 Biology & Genetics, Faculty of Science, University of South Bohemia, Branišovská 31, 37005 8 České Budějovice, Czech Republic. 9 2. Laboratory of Biochemistry and Molecular Biology of Germ Cells, Institute of Animal Physiology 10 and Genetics, CAS, Rumburská 89, 27721 Liběchov, Czech Republic. 11 3. Central European Institute of Technology, Masaryk University, 62500 Brno, Czech Republic. 12 Correspondence: 13 *
[email protected] 14 *
[email protected] 15 Contributions: 16 P.B. and A.W.B. conceived the project, designed experiments, analysed results and wrote the 17 manuscript. P.B. and L.G. prepared samples for mass spectrometry. P.B., A.H., M.S. and R.C. conducted 18 experiments. A.H. also analysed some results. L.G. analysed proteomic and phosphoproteomic data. D.P. 19 and Z.Z. performed phosphoproteomic mass spectrometry, did preliminary data analysis and wrote the 20 associated methods. 21 Funding: 22 This work was supported by a project grant from the Czech Science Foundation/GAČR (18-02891S), a 23 Marie Curie Individual Fellowship (MSC IF 708255) awarded to L.G.