Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Expression data from TFIIA-non-cleavable mouse fetal liver hematopoietic stem cells

ABSTRACT: During embryogenesis, development of hematopoietic stem cells (HSC) occurs in the fetal liver and involves coordinate programs of transcription. Taspase1, a highly conserved threonine protease, directly cleaves and regulates the TFIIA families of transcription factors. We discovered that loss of Taspase1 (Tasp1-/-) or non-cleavage of TFIIAa-b (TFIIAa-b nc/nc) leads to a severe fetal liver developmental retardation that is associated with impaired HSC self-renewal and loss of HSC quiescence. We used microarray to elucidate the mechanism(s) by which TFIIA regulates fetal liver hematopoiesis, and expression of targets of HoxA9 was found to be altered by gene set enrichment analyses. Embryonic day 14.5 fetal liver HSCs (defined as Lineage-Sca-1+c-Kit+CD150+cells) of wild-type (n = 4) and TFIIAa-b nc/nc (n = 3) were analyzed.

ORGANISM(S): Mus musculus

SUBMITTER: Hidetaka Niizuma

PROVIDER: E-GEOD-47422 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Haematopoietic stem cells (HSCs) are derived early from embryonic precursor cells, such as haemogenic endothelial cells and pre-HSCs. However, the identity of precursor cells remains elusive due to their rareness, transience, and inability to be isolated efficiently. Here we employed potent surface markers to capture the nascent pre-HSCs at 30% purity, as rigorously validated by single-cell-initiated serial transplantation assay. Then we applied single-cell RNA-Seq technique to analyse five populations closely related to HSC formation: endothelial cells, CD45- and CD45+ pre-HSCs in E11 aorta-gonad-mesonephros (AGM) region, and mature HSCs in E12 and E14 foetal liver. In comparison, the pre-HSCs showed unique features in transcriptional machinery, apoptosis, metabolism state, signalling pathway, transcription factor network, and lncRNA expression pattern. Among signalling pathways enriched in pre-HSCs, the mTOR activation was uncovered indispensable for the emergence of HSCs but not haematopoietic progenitors from endothelial cells in vivo. By comparing with proximal populations without HSC potential, the core molecular signature of pre-HSCs was identified. Collectively, our work paves the way for dissection of complex molecular mechanisms regulating the step-wise generation of HSCs in vivo, informing future efforts to engineer HSCs for clinical application. RNA-Seq of 181 single-cell samples from 8 FACS sorted cell types: 1. endothelial cells (samples E11.0_EC_xxxx. CD31+ VE-cadherin+CD41-CD43-CD45-Ter119-); 2. T1 pre-HSCs (samples E11.0_T1_xxxx. CD31+CD45-CD41low c-Kit+CD201high); 3. T1 CD201- cells (samples E11.0_T1CD201neg_xxxx, CD31+CD45-CD41low c-Kit+CD201low/-) ; 4. T2 pre-HSCs (samples E11.0_T2_35xx. CD31+CD45+c-Kit+CD201high), 5. T2 CD41low (samples E11.0_T2_21xx, E11.0_T2_24xx and E11.0_T2_27xx. CD31+CD45+CD41low); 6. E12 HSCs (samples E12.5_FL_xxxx. Lin-Sca-1+Mac-1lowCD201+); 7. E14 HSCs (samples E14.5_FL_xxxx. CD45+CD150+CD48-CD201+); 8. Adult HSCs (samples Adult_HSC_xxxx. CD45+CD150+CD48-CD201+). ECs, T1 pre-HSCs, T1 CD201- cells, T2 pre-HSCs, T2 CD41low cells were sorted from E11 AGM region. Mature HSCs were sorted from E12 or E14 fetal liver and adult bonemarrow.

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Expression data from TFIIA-non-cleavable mouse fetal liver hematopoietic stem cells

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