Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Single-cell multi-omics of human clonal hematopoiesis reveals that DNMT3A R882 mutations perturb early progenitor states through selective hypomethylation.

ABSTRACT: Somatic mutations in cancer genes have been ubiquitously detected in clonal expansions across healthy human tissue, including in clonal hematopoiesis. However, mutated and wildtype cells are morphologically and phenotypically similar, limiting the ability to link genotypes with cellular phenotypes. To overcome this limitation, we leveraged multi-modality single-cell sequencing, capturing the mutation with transcriptomes and methylomes in progenitors from individuals with DNMT3A R882 mutated clonal hematopoiesis. DNMT3A mutations resulted in myeloid over lymphoid bias, and in expansion of immature myeloid progenitors primed toward megakaryocytic-erythroid fate. We observed dysregulated expression of lineage and leukemia stem cell markers. DNMT3A R882 led to preferential hypomethylation of polycomb repressive complex 2 targets and a specific sequence motif. Notably, the hypomethylation motif is enriched in binding motifs of key hematopoietic transcription factors, serving as a potential mechanistic link between DNMT3A R882 mutations and aberrant transcriptional phenotypes. Thus, single-cell multi-omics pave the road to defining the downstream consequences of mutations that drive human clonal mosaicism.

PROVIDER: EGAS00001006364 | EGA |

REPOSITORIES: EGA

ACCESS DATA

Json Xml

Similar Datasets

Cell of origin epigenetic priming determines susceptibility to Tet2 mutation

Project description:Hematopoietic stem cell (HSC) mutations can result in clonal hematopoiesis (CH) with heterogeneous clinical outcomes. Here, we investigated how the cell state preceding Tet2 mutation impacts the pre-malignant phenotype. Using an inducible system for clonal analysis of myeloid progenitors, we found that the epigenetic features of clones at similar differentiation status were highly heterogeneous and functionally responded differently to Tet2 mutation. Cell differentiation stage also influenced Tet2 mutation response indicating that the cell of origin's epigenome modulates clone-specific behaviors in CH. Molecular features associated with higher risk outcomes include Sox4 that sensitized cells to Tet2 inactivation, inducing dedifferentiation, altered metabolism and increasing the in vivo clonal output of mutant cells, as confirmed in primary GMP and HSC models. Our findings validate the hypothesis that epigenetic features can predispose specific clones for dominance, explaining why identical genetic mutations can result in different phenotypes.

1970-01-01 | MTBLS9914 | MetaboLights

Single-cell multi-omics in human clonal hematopoiesis reveals that DNMT3A R882 mutations perturb early progenitor states through selective hypomethylation.

Project description:Clonal hematopoiesis (CH) reflects clonal expansion of blood stem and progenitor cells with somatic mutations. We leveraged multi-modality single-cell sequencing to capture mutation status together with the transcriptome and methylome of CD34+ hematopoietic progenitor cells from five individuals with DNMT3A R882-mutated CH.

2022-07-05 | GSE158067 | GEO

DNMT3A clonal hematopoiesis-driver mutations induce cardiac fibrosis by paracrine activation of fibroblasts

Project description:Hematopoietic mutations in epigenetic regulators like DNA methyltransferase 3 alpha (DNMT3A) drive clonal hematopoiesis of indeterminate potential (CHIP) and are associated with adverse prognosis in patients with heart failure (HF). The interactions between CHIP-mutated cells and other cardiac cell types remain unknown. Here, we identify fibroblasts as potential interaction partners of CHIP-mutated monocytes using combined transcriptomic data from peripheral blood mononuclear cells of HF patients with and without CHIP and cardiac tissue. We demonstrate that DNMT3A inactivation augments macrophage-to-cardiac fibroblasts interactions and induces cardiac fibrosis in mice and humans. Mechanistically, DNMT3A inactivation increases the release of heparin-binding epidermal growth factor (EGF)-like growth factor (HB-EGF) to activate cardiac fibroblasts. These findings not only identify a novel pathway of DNMT3A CHIP-driver mutation-induced instigation and progression of HF, but may also provide a rationale for the development of new anti-fibrotic strategies.

2023-10-20 | E-MTAB-13384 | biostudies-arrayexpress

DNMT3A haploinsufficiency predisposes hematopoietic cells to myeloid malignancies

Project description:DNMT3A (which encodes a de novo DNA methyltransferase) is one of the most frequently mutated genes in AML genomes. Point mutations at position R882 have been shown to cause a dominant negative loss of DNMT3A methylation activity, but 15% of DNMT3A mutations are predicted to produce truncated proteins, which could either have dominant negative activities, or cause loss-of-function and haploinsufficiency. We demonstrate that three of these mutants produce truncated, inactive proteins that do not dimerize with wild-type DNMT3A, strongly supporting the haploinsufficiency hypothesis. We therefore evaluated hematopoiesis in mice heterozygous for a constitutive null Dnmt3a mutation: unmanipulated mice developed myeloid skewing over time, and their stem/progenitor cells exhibited a long-term competitive transplantation advantage. Dnmt3a+/- mice spontaneously developed transplantable myeloid malignancies after a long latent period, and three of 12 tumors tested had cooperating mutations in the Ras- MAPK pathway. The residual Dnmt3a allele was neither mutated nor downregulated in tumors. The bone marrow cells of Dnmt3a+/- mice had a subtle but significant DNA hypomethylation phenotype that was not associated with gene dysregulation. These data demonstrate that haploinsufficiency for DNMT3A alters hematopoiesis, and predisposes mice (and probably humans) to myeloid malignancies by a mechanism that is not yet clear.

2017-08-01 | GSE100702 | GEO

Inflammatory signals from fatty bone marrow support DNMT3a-driven clonal hematopoiesis (NOD/SCID/IL-2Rgc-null subset)

Project description:Accumulation of fatty bone marrow (FBM) is one of the key age related changes possibly influencing the blood system. While a link between obesity and cancer evolution has been reported it remains unknown whether FBM can modify the evolution of the early stages of leukemia and clonal hematopoiesis (CH). To address this question, we established different FBM mouse models in immunodeficient mice in whom we can study both mouse and human cells. We focused our studies on two FBM models: 1) after sublethal irradiation; 2) after castration; and in both we used an adipogenesis inhibitor as a control (PPARγ inhibitor). We transplanted both human and mice hematopoietic stem cells (HSCs) carrying DNMT3A mutations into immunodeficient mice with FBM. A significant increase in self-renewal was found when DNMT3AMut-HSCs were exposed to FBM. To better understand the mechanisms of the FBM-CH interaction, we performed single cell RNA-sequencing on HSPCs after FBM exposure in vivo. A 6-10 fold increase in DNMT3AMut-HSCs was observed under FBM conditions in comparison to normal bone marrow. Mutated HSCs from mice exposed to FBM exhibited an activated inflammatory signaling (IL-6 and IFNγ). Cytokine analysis of BM fluid and BM derived adipocytes grown in vitro demonstrated increased IL-6 levels under FBM conditions. Anti-IL-6 neutralizing antibodies significantly reduced the selective advantage of mice derived DNMT3AMut-HSCs exposed to FBM. Overall, paracrine FBM inflammatory signals promote DNMT3A-driven clonal hematopoiesis, which can be inhibited by blocking the IL-6 receptor.

2023-02-19 | E-MTAB-12620 | biostudies-arrayexpress

Inflammatory signals from fatty bone marrow support DNMT3a-driven clonal hematopoiesis (wt/DNMT3A KI subset)

2023-02-19 | E-MTAB-12614 | biostudies-arrayexpress

Inflammatory signals from fatty bone marrow support DNMT3a-driven clonal hematopoiesis (Dnmt3A KI heterozygote subset)

2023-02-19 | E-MTAB-12613 | biostudies-arrayexpress

Constitutive loss of DNMT3A causes morbid obesity through misregulation of adipogenesis

Project description:DNA Methyltransferase 3A (DNMT3A) is an important facilitator of differentiation of both embryonic and hematopoietic stem cells. Heterozygous germline mutations in DNMT3A lead to Tatton-Brown-Rahman Syndrome (TBRS), characterized by obesity and excessive height. While DNMT3A is known to impact feeding behavior via the hypothalamus, here we investigated a role in adipocyte progenitors utilizing heterozygous knockout mice that recapitulate cardinal TBRS phenotypes. These mice become morbidly obese due to adipocyte enlargement and tissue expansion. Adipose tissue in these mice exhibited defects in preadipocyte maturation and precocious activation of inflammatory gene networks, including interleukin-6 signaling. Adipocyte progenitor cell lines lacking DNMT3A exhibited aberrant differentiation. Furthermore, mice in which Dnmt3a was specifically ablated in adipocyte progenitors showed enlarged fat depots and increased progenitor numbers, partly recapitulating the TBRS obesity phenotypes. Loss of DNMT3A led to constitutive DNA hypomethylation, such that the DNA methylation landscape of young adipocyte progenitors resemble that of older wild-type mice. Together, our results demonstrate that DNMT3A coordinates both the central and local control of energy storage required to maintain normal weight and prevent inflammatory obesity.

2022-05-10 | GSE164892 | GEO

Identification of cell-intrinsic effects of clonal hematopoiesis in heart failure

Project description:Clonal hematopoiesis of indeterminate potential (CHIP) is caused by somatic mutations in hematopoietic stem cells and is associated with worse prognosis in heart failure patients. Patients harboring CHIP mutations show enhanced inflammation. However, whether these signatures are derived from the relatively low number of cells harboring mutations or are indicators of a systemic pro-inflammatory activation that is associated with CHIP is unclear. In this study, we assessed the cell-intrinsic effects of CHIP mutant-carrying cells in patients with heart failure. Using an improved protocol to detect mutant cells on a single cell level (MutDetect-Seq), we show that DNMT3A mutant monocytes exhibit altered gene expression profiles associated with inflammation and phagolysosome function. Gene expression was also significantly altered in DNMT3A mutant CD4+ T cells and NK cells, but not CD8 T cells. DNMT3A silenced CD4+ T cells and NK cells showed increased effector functions. Moreover, increased paracrine signaling pathways are predicted and validated between mutated and wild monocytes and T cells, which amplify inflammatory circuits. Taken together, these data provide novel insights into how CHIP might promote worse prognosis in heart failure patients.

2023-06-15 | E-MTAB-13016 | biostudies-arrayexpress

Targeting of DNMT3A hotspot mutations in Clonal Hematopoiesis and Acute Myeloid Leukemia

Project description:Somatic mutations in DNA Methyltransferase 3A (DNMT3A) with a hotspot in exon 23 at Arginine 882 (DNMT3AR882mut) are the most frequent single mutations in clonal hematopoiesis. Here we analyze the expression of genes and endogenous retrovirus (ERV) sequences in a murine model carrying human DNMT3A-R882H mutation in one allele of the endogenous DNMT3A with respect to normal condition and azacitidine treatment.

2021-01-26 | GSE146907 | GEO

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

Tweets

OmicsDI Databases

PRIDE
PeptideAtlas
MassIVE
JPOST Repository
Physiome Model Repository

EGA
EVA
ENA
LINCS
PAXDB
Cell Collective

MetaboLights
Metabolomics Workbench
MetabolomeExpress
GNPS
BioModels
FAIRDOMHub

ArrayExpress
dbGaP
ExpressionAtlas
GEO
NODE

Information

Databases
Help
API
Contact us
Code on GitHub
Terms of use
Submit Data