title: The ISWI ATPase Smarca5 (Snf2h) Is Required for Proliferation and Differentiation of Hematopoietic Stem and Progenitor Cells.
abstract: The imitation switch nuclear ATPase Smarca5 (Snf2h) is one of the most conserved chromatin remodeling factors. It exists in a variety of oligosubunit complexes that move DNA with respect to the histone octamer to generate regularly spaced nucleosomal arrays. Smarca5 interacts with different accessory proteins and represents a molecular motor for DNA replication, repair, and transcription. We deleted Smarca5 at the onset of definitive hematopoiesis (Vav1-iCre) and observed that animals die during late fetal development due to anemia. Hematopoietic stem and progenitor cells accumulated but their maturation toward erythroid and myeloid lineages was inhibited. Proerythroblasts were dysplastic while basophilic erythroblasts were blocked in G2/M and depleted. Smarca5 deficiency led to increased p53 levels, its activation at two residues, one associated with DNA damage (S15Ph°s) second with CBP/p300 (K376Ac), and finally activation of the p53 targets. We also deleted Smarca5 in committed erythroid cells (Epor-iCre) and observed that animals were anemic postnatally. Furthermore, 4-hydroxytamoxifen-mediated deletion of Smarca5 in the ex vivo cultures confirmed its requirement for erythroid cell proliferation. Thus, Smarca5 plays indispensable roles during early hematopoiesis and erythropoiesis. Stem Cells 2017;35:1614-1623.
authors.affiliation: BIOCEV, First Faculty of Medicine, Charles University, Czech Republic.|Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York, USA.
authors.forename: Juraj
authors.identifier: 0000-0003-0267-4570
authors.initials: J
authors.lastname: Kokavec
authors.affiliation: BIOCEV, First Faculty of Medicine, Charles University, Czech Republic.
authors.forename: Tomas
authors.initials: T
authors.lastname: Zikmund
authors.affiliation: BIOCEV, First Faculty of Medicine, Charles University, Czech Republic.
authors.forename: Filipp
authors.initials: F
authors.lastname: Savvulidi
authors.affiliation: BIOCEV, First Faculty of Medicine, Charles University, Czech Republic.
authors.forename: Vojtech
authors.initials: V
authors.lastname: Kulvait
authors.affiliation: Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York, USA.
authors.forename: Winfried
authors.initials: W
authors.lastname: Edelmann
authors.affiliation: Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York, USA.
authors.forename: Arthur I
authors.initials: AI
authors.lastname: Skoultchi
authors.affiliation: BIOCEV, First Faculty of Medicine, Charles University, Czech Republic.
authors.forename: Tomas
authors.initials: T
authors.lastname: Stopka
mesh_terms: D000251:Adenosine Triphosphatases / Q000172:deficiency / Q000378:metabolism*; D000740:Anemia / Q000473:pathology; D000818:Animals; D002453:Cell Cycle; D002454:Cell Differentiation; D049109:Cell Proliferation; D002868:Chromosomal Proteins, Non-Histone / Q000172:deficiency / Q000378:metabolism*; D004249:DNA Damage / Q000235:genetics; D041905:Erythroid Cells / Q000166:cytology; D004920:Erythropoiesis; D017353:Gene Deletion; D005838:Genotype; D006410:Hematopoiesis; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000378:metabolism*; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism
chemical_list: D002868:Chromosomal Proteins, Non-Histone; D012333:RNA, Messenger; D016159:Tumor Suppressor Protein p53; D000251:Adenosine Triphosphatases; C498725:Smarca5 protein, mouse
keywords: Cell cycle progression; Erythroid differentiation; Fetal liver erythropoiesis; Hematopoietic stem and progenitor cells; Hypoxia; Imitation switch; Smarca5; p53 pathway