Bone marrow cells of CCAT2 mice display exhaustion of hematopoietic stem cells. (A) Flow cytometry analysis of hematopoietic stem cells in MDS- and MPN-like CCAT2 mice compared to WT mice. Cells analyzed include LSK (Lin⁻Sca1⁺cKit⁺) cells; long-term HSCs (LT-HSCs, defined by Lin⁻cKit⁺Sca1⁺CD34^loCD135^lo population); and short-term HSCs (ST-HSCs, defined by Lin⁻cKit⁺Sca1⁺CD34^hiCD135^lo population). (B) Flow cytometric analysis of hematopoietic progenitor cells in MDS- and MPN-like CCAT2 mice compared to WT mice. Cells analyzed include common myeloid progenitors (CMPs, Lin⁻cKit⁺Sca1^−/loCD34⁺FcγR^lo population); granulocyte–macrophage progenitors (GMPs, Lin⁻cKit⁺Sca1⁻CD34⁺FcγR⁺ population) and megakaryocyte–erythroid progenitors (MEPs, Lin⁻cKit⁺Sca1⁻CD34⁻FcγR⁻ population). (C) In vitro colony formation assay (left) and in vitro serial replating analysis (right) using bone marrow cells of WT, MDS-, and MPN-like CCAT2 mice. Data are average of three independent experiments done in triplicates. (D,E) Flow cytometry analysis of B cells in different developmental phases (D) and expression of developmental markers Il-7rα and CD79b in pro–pre B cells (E) of CCAT2 mice compared to WT mice. (F) Flow cytometric analysis of T cells in different developmental phases in CCAT2-G and CCAT2-T mice compared to WT mice. Data are represented as mean values ±SEM. (*) P < 0.05; (**) P < 0.01; (***) P < 0.001.