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Gene expression profile of HSC/Ps and mature myeloid cells in MDS mutant clone

ABSTRACT: MDS are characterized by bone marrow (BM) failure due to ineffective hematopoiesis. However, the underlying mechanisms of ineffective hematopoiesis, in which clonal expansion coexists with accelerated cell death, remain to be elucidated. Recently, we detected CBL exon 8/9 deletion mutation (CBLΔE8/9) in several MDS patients with RUNX1 mutations. The CBLΔE8/9/RUNX1S291fs mice (CR-mice) developed a variety of MDS phenotypes, such as pancytopenia, dysplasia, and ineffective hematopoiesis in BM. RNA-Seq of HSC/progenitor (HSC/P) and mutant mature myeloid BM cells revealed that gene signature induced in the CR-mice is similar to that in MDS patients with BM failure. Especially, innate immune-related genes were significantly dysregulated.

ORGANISM(S): Mus musculus

PROVIDER: GSE151694 | GEO | 2021/08/16

REPOSITORIES: GEO

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Project description:TRAF-interacting protein with forkhead-associated domain B (TIFAB) is a haploinsufficient gene in del(5q) Myelodysplastic syndrome (MDS). Hematopoietic-specific deletion of Tifab results in progressive bone marrow (BM) and blood defects, including skewed hematopoietic stem/progenitor cells (HSPC) proportions, altered myeloid differentiation, and progressive cytopenia. A subset of mice transplanted with Tifab knockout (KO) hematopoietic cells develop a bone marrow failure (BMF)-like disease with neutrophil dysplasia and cytopenia. In competitive transplants, Tifab KO HSPC are out-competed by wild-type (WT) cells, suggesting a cell-intrinsic HSPC defect. Gene expression analysis of Tifab KO HSPC identified dysregulation of immune-related signatures, and hypersensitivity to Toll-like receptor 4 (TLR4) stimulation. TIFAB also forms a complex with TRAF6, a mediator of immune signaling, and reduces TRAF6 protein stability by a lysosome-dependent mechanism. In contrast, TIFAB loss increases TRAF6 protein and the dynamic range of TLR4 signaling in HSPC, contributing to ineffective hematopoiesis. Moreover, combined deletion of TIFAB and miR-146a, two genes associated with del(5q) MDS/AML, results in a cooperative increase in TRAF6 expression and hematopoietic dysfunction in vivo. Re-expression of TIFAB in human del(5q) leukemic cells results in attenuated TLR4 signaling and reduced cell viability. These findings underscore the importance of efficient regulation of innate immune/TRAF6 signaling within HSPC by TIFAB, and its cooperation with miR-146a as it relates to the pathogenesis of hematopoietic malignancies, such as del(5q) MDS/AML. We performed an expression analysis on sorted lineage-Sca1+cKit+ (LSK) isolated from bone marrow (BM) of 3 month old mice transplanted with Tifab+/+ (WT) or Tifab-/- (KO) BM cells (n = 3 mice/group). We selected this time point to capture the gene expression profile of Tifab-/- LSK after engraftment but prior to overt hematopoietic failure. Total RNA was extracted, purified, reverse transcribed, labeled, and hybridized onto the GeneChip MoGene 2.0 ST Array (Affymetrix). Comparison comprises mRNA expression profile of Tifab+/+ LSK vs. Tifab-/- LSK.

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Gene expression profile of HSC/Ps and mature myeloid cells in MDS mutant clone

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