Project description:The formation of hematopoietic cells relies on the chromatin remodeling activities of ISWI ATPase SMARCA5 (SNF2H) and its complexes. The Smarca5 null and conditional alleles have been used to study its functions in embryonic and organ development in mice. These mouse model phenotypes vary from embryonic lethality of constitutive knockout to less severe phenotypes observed in tissue-specific Smarca5 deletions, e.g., in the hematopoietic system. Here we show that, in a gene dosage-dependent manner, the hypomorphic allele of SMARCA5 (S5tg) can rescue not only the developmental arrest in hematopoiesis in the hCD2iCre model but also the lethal phenotypes associated with constitutive Smarca5 deletion or Vav1iCre-driven conditional knockout in hematopoietic progenitor cells. Interestingly, the latter model also provided evidence for the role of SMARCA5 expression level in hematopoietic stem cells, as the Vav1iCre S5tg animals accumulate stem and progenitor cells. Furthermore, their hematopoietic stem cells exhibited impaired lymphoid lineage entry and differentiation. This observation contrasts with the myeloid lineage which is developing without significant disturbances. Our findings indicate that animals with low expression of SMARCA5 exhibit normal embryonic development with altered lymphoid entry within the hematopoietic stem cell compartment.
Project description:Data for the manuscript Casirati et al. "Epitope Editing of Hematopoietic Stem Cells Enables Adoptive Immunotherapies for Acute Myeloid Leukemia"
Project description:Mouse CD34(-)KSL hematopoietic stem cells and CD34(+)KSL multipotent progenitors were purified by cell sorting from bone marrow of 8-week-old C57BL/6 mice, and their gene expression was analyzed. Two biological replicates of CD34(-)KSL hematopoietic stem cells and CD34(+)KSL multipotent progenitors were analyzed using a Mouse Genome 430 2.0 array (Affymetrix).
Project description:Hematopoietic stem cells (HSCs) are a specialized group of cells with the ability to self-renew and differentiate into distinct lineages of the entire hematopoietic system throughout lifetime. The maintenance of a quiescent state is essential for sustaining the normal function of HSCs. Many regulatory factors involved in HSC quiescence maintenance have been found. However the role steroid receptor coactivator 3 (SRC-3) in the regulation of HSC maintenance remains unexplored. We used microarrays to detail the global programme of gene expression in lineage- Sca1+ c-Kit+ cells (LSKs) from wild-type (WT) and SRC-3 knockout (KO) mice and identified distinct classes of altered genes after SRC-3 knockout.