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| Status |
Public on Aug 24, 2023 |
| Title |
ETV6 Represses Inflammatory Response Genes and Regulates HSPC Function During Stress Hematopoiesis in Mice [scRNA-seq] |
| Organism |
Mus musculus |
| Experiment type |
Expression profiling by high throughput sequencing
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| Summary |
ETS Variant 6 (ETV6) encodes an essential transcriptional repressor abundantly expressed in hematopoietic stem and progenitor cells (HSPCs), where it is required for adult hematopoiesis. Heterozygous pathogenic germline ETV6 variants are associated with Thrombocytopenia 5 (T5), a poorly-understood genetic condition predisposing to thrombocytopenia and hematologic malignancies. To elucidate how germline ETV6 variants impact the HSPC compartment and contribute to disease, we generated a knock-in mouse harboring an Etv6R355X loss-of-function variant, which represents the mouse equivalent to the T5-associated variant ETV6R359X. All HSPC subpopulations are present in the bone marrow (BM) of Etv6R355X/+ mice under homeostatic conditions; however, these animals exhibit subtle shifts in the proportions and/or numbers of specific progenitor subtypes. To examine whether the Etv6R355X/+ mutation impacts HSPC function, we carried out serial competitive transplantation and observed that Etv6R355X/+ lineageď€sca1+cKit+ (LSK) cells exhibit significantly impaired reconstitution, with near complete failure to repopulate irradiated-recipients by the tertiary transplant. Mechanistic studies incorporating CUT&RUN, ATAC-Seq and Hi-C identify ETV6 binding at inflammatory gene loci, including those within the TNF pathway in Etv6+/+ HSPCs, the mouse BM-progenitor derived HPC5 cell line, and G-CSF-mobilized human CD34+ cells. Further, single-cell RNA sequencing of mouse LSK cells isolated six-weeks post-competitive transplantation reveals upregulation of inflammatory gene pathways. Corroborating these findings, we observe significantly increased production of TNF by Etv6R355X/+ versus Etv6+/+ HSPCs post-transplantation. From these studies, we conclude that ETV6 represses inflammatory response genes within HSPCs under conditions of hematopoietic stress, and that this mechanism may be critical to sustain HSPC function.
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| Overall design |
To elucidate how germline ETV6 variants impact the HSPC compartment and contribute to disease, we generated a knock-in mouse harboring Etv6R355X, the murine equivalent to a T5-associated variant ETV6R359X. Young Etv6R355X/+ mice retained normal frequencies of lineage-sca1+cKit+ (LSK) cells but LSK frequencies were significantly decreased in 12-month-old animals.
Single cell RNAseq of post-transplant LSK enriched bone marrow from Etv6R355X/+ and Etv6 +/+ mice.
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| Contributor(s) |
Bloom M, Oak N, Nichols KE |
| Citation(s) |
37522715 |
| BioProject |
PRJNA880871 |
| |
| Submission date |
Jun 02, 2023 |
| Last update date |
Feb 28, 2024 |
| Contact name |
Kim Nichols |
| E-mail(s) |
[email protected]
|
| Organization name |
St. Jude Children's Research Hospital
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| Department |
Oncology
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| Lab |
Nichols Lab
|
| Street address |
262 Danny Thomas Pl
|
| City |
Memphis |
| State/province |
TN |
| ZIP/Postal code |
38105 |
| Country |
USA |
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| Platforms (1) |
| GPL24247 |
Illumina NovaSeq 6000 (Mus musculus) |
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| Samples (6)
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| This SubSeries is part of SuperSeries: |
| GSE213597 |
ETV6 Represses Inflammatory Response Genes and Regulates HSPC Function During Stress Hematopoiesis in Mice |
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