Project description:Gene expression analysis on purified murine hematopoietic stem cells (HSCs) deficient for Special AT-rich sequence-binding protein 1 (Satb1) compared to wild-type HSCs.
Project description:Gene expression analysis on purified murine hematopoietic stem cells (HSCs) deficient for Special AT-rich sequence-binding protein 1 (Satb1) compared to wild-type HSCs. Analysis of gene expression of bone marrow-derived CD45.2+ CD150+cKit+Sca-1+CD4-CD8a-CD19-B220-Gr-1- HSCs from congenic recipient animals transplanted >20 weeks with either wild-type or Satb1-deficient hematopoeitic cells.
Project description:How hematopoietic stem cells (HSCs) produce specific lineages is not well understood. We searched for key factors that direct HSC to lymphopoiesis. Comparing gene expression profiles for HSCs and early lymphoid progenitors revealed that Satb1, a global chromatin regulator, was significantly induced with lymphoid lineage specification. HSCs from Satb1-null mouse were defective in lymphopoietic activity in culture, and failed to reconstitute T-lymphopoiesis in wild-type recipients. Furthermore, Satb1-transduction in HSCs, as well as in embryonic stem cells, robustly promoted their differentiation toward lymphocytes in culture. We prepared RNA samples from control or Satb1-transfected Lin- c-kitHi Sca-1+ Flt3- cells derived from WT mouse bone marrow.
Project description:How hematopoietic stem cells (HSCs) produce specific lineages is not well understood. We searched for key factors that direct HSC to lymphopoiesis. Comparing gene expression profiles for HSCs and early lymphoid progenitors revealed that Satb1, a global chromatin regulator, was significantly induced with lymphoid lineage specification. HSCs from Satb1-null mouse were defective in lymphopoietic activity in culture, and failed to reconstitute T-lymphopoiesis in wild-type recipients. Furthermore, Satb1-transduction in HSCs, as well as in embryonic stem cells, robustly promoted their differentiation toward lymphocytes in culture.
Project description:Hematopoietic stem cells (HSCs) are now recognized as a heterogeneous population in self-renewing and differentiation capabilities. However, fundamental mechanisms governing the heterogeneity remain uncertain. We here show that special AT-rich sequence-binding protein 1 (SATB1), a global chromatin organizer, is involved in the mechanisms. Analyzing hematological lineage-restricted SATB1 knock out mice proved that SATB1 is indispensable for both self-renewal and normal differentiation of adult HSCs. Using SATB1/Tomato knock-in mice, we subdivided HSCs according to SATB1 intensity. Culture experiments and RNA-sequencing revealed essential differences between SATB1- and SATB1+ HSCs regarding lineage potential.
Project description:Our data show Satb1 deficiency leads to alterations in DNA cytosine methylation and a commitment-primed epigenetic state in HSCs. Examination of DNA cytosine methylation in wild type HSC and differentiation-committed progenitors as well as in wild type HSC and HSC lacking Satb1 (n=2 each).
Project description:RNA-seq analysis of differentially expressed genes in wild-type, NFAT5-deficient, IFNAR1-deficient and double deficient (NFAT5 and IFNAR1) hematopoietic stem cells (HSC) and multipotent progenitors (MPP)
Project description:Microarray analysis of differentially expressed genes in wild-type and NFAT5-deficient hematopoietic stem cells (HSC) and multipotent progenitors (MPP)
Project description:Microarray analysis of differentially expressed genes in wild-type and NFAT5-deficient hematopoietic stem cells (HSC) and multipotent progenitors (MPP)
Project description:Endomucin (EMCN) currently represents the only hematopoietic stem cell (HSC) marker expressed by both murine and human HSCs. Here, we report that EMCN+ long-term repopulating HSCs (LT-HSCs; CD150+CD48−LSK) have a higher long-term multi-lineage repopulating capacity compared to EMCN− LT-HSCs. Cell cycle analyses and transcriptional profiling demonstrated that EMCN+ LT-HSCs were more quiescent compared to EMCN− LT-HSCs. Emcn−/− and Emcn+/+ mice displayed comparable steady-state hematopoiesis, as well as frequencies, transcriptional programs, and long-term multi-lineage repopulating capacity of their LT-HSCs. Complementary functional analyses further revealed increased cell cycle entry upon treatment with 5-fluorouracil and reduced granulocyte colony-stimulating factor (GCSF) mobilization of Emcn−/− LT-HSCs, demonstrating that EMCN expression by LT-HSCs associates with quiescence in response to hematopoietic stress and is indispensable for effective LT-HSC mobilization. Transplantation of wild-type bone marrow cells into Emcn−/− or Emcn+/+ recipients demonstrated that EMCN is essential for endothelial cell-dependent maintenance/self-renewal of the LT-HSC pool and sustained blood cell production post-transplant.
