Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Molecular and Functional Characterization of Disease-Propagating Stem Cells in Juvenile Myelomonocytic Leukemia

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Homo sapiens

PROVIDER: GSE111895 | GEO | 2020/12/20

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

Heterogeneous disease-propagating stem cells in juvenile myelomonocytic leukemia.

Project description:Juvenile myelomonocytic leukemia (JMML) is a poor-prognosis childhood leukemia usually caused by RAS-pathway mutations. The cellular hierarchy in JMML is poorly characterized, including the identity of leukemia stem cells (LSCs). FACS and single-cell RNA sequencing reveal marked heterogeneity of JMML hematopoietic stem/progenitor cells (HSPCs), including an aberrant Lin-CD34+CD38-CD90+CD45RA+ population. Single-cell HSPC index-sorting and clonogenic assays show that (1) all somatic mutations can be backtracked to the phenotypic HSC compartment, with RAS-pathway mutations as a "first hit," (2) mutations are acquired with both linear and branching patterns of clonal evolution, and (3) mutant HSPCs are present after allogeneic HSC transplant before molecular/clinical evidence of relapse. Stem cell assays reveal interpatient heterogeneity of JMML LSCs, which are present in, but not confined to, the phenotypic HSC compartment. RNA sequencing of JMML LSC reveals up-regulation of stem cell and fetal genes (HLF, MEIS1, CNN3, VNN2, and HMGA2) and candidate therapeutic targets/biomarkers (MTOR, SLC2A1, and CD96), paving the way for LSC-directed disease monitoring and therapy in this disease.

| S-EPMC7802370 | biostudies-literature

Molecular and Functional Characterization of Disease-Propagating Stem Cells in Juvenile Myelomonocytic Leukemia [FACS sorted populations]

Project description:We report on the characterization of JMML hematopoietic stem and progenitor cells (HSPCs). In order to molecularly characterize these populations we preformed bulk RNA-seq on purified cord blood and JMML HSCs, GMPs, and JMML double positives (+/+). We identified a conserved molecular hierarchy in JMML with high stem cell gene expression in HSCs, high progenitor and cell cycle gene expression in GMPs. We identified enriched gene sets in JMML HSCs vs CB HSCs, and find a number of potential therapeutic targets expressed in JMML.

2020-12-20 | GSE111709 | GEO

Molecular and Functional Characterization of Disease-Propagating Stem Cells in Juvenile Myelomonocytic Leukemia [single cell RNA-seq]

Project description:We report on the characterization of JMML hematopoietic stem and progenitor cells (HSPCs). In order to characterize the single cell heterogeneity in comparison to normal cord blood we preformed droplet based single cell RNA-seq of FACS sorted CD34+ cells using the 10x genomics platform. We identified distinct clustering of unique JMML HSPC populations in relation to cord blood control.

2020-12-20 | GSE111893 | GEO

Molecular and Functional Characterization of Disease-Propagating Stem Cells in Juvenile Myelomonocytic Leukemia

Project description:Molecular and Functional Characterization of Disease-Propagating Stem Cells in Juvenile Myelomonocytic Leukemia

| PRJNA438496 | ENA

Molecular and Functional Characterization of Disease-Propagating Stem Cells in Juvenile Myelomonocytic Leukemia [FACS sorted populations]

Project description:Molecular and Functional Characterization of Disease-Propagating Stem Cells in Juvenile Myelomonocytic Leukemia [FACS sorted populations]

| PRJNA437946 | ENA

Molecular and Functional Characterization of Disease-Propagating Stem Cells in Juvenile Myelomonocytic Leukemia [single cell RNA-seq]

Project description:Molecular and Functional Characterization of Disease-Propagating Stem Cells in Juvenile Myelomonocytic Leukemia [single cell RNA-seq]

| PRJNA438508 | ENA

Current Treatment of Juvenile Myelomonocytic Leukemia.

Project description:Juvenile myelomonocytic leukemia (JMML) is a rare pediatric leukemia characterized by mutations in five canonical RAS pathway genes. The diagnosis is made by typical clinical and hematological findings associated with a compatible mutation. Although this is sufficient for clinical decision-making in most JMML cases, more in-depth analysis can include DNA methylation class and panel sequencing analysis for secondary mutations. NRAS-initiated JMML is heterogeneous and adequate management ranges from watchful waiting to allogeneic hematopoietic stem cell transplantation (HSCT). Upfront azacitidine in KRAS patients can achieve long-term remissions without HSCT; if HSCT is required, a less toxic preparative regimen is recommended. Germline CBL patients often experience spontaneous resolution of the leukemia or exhibit stable mixed chimerism after HSCT. JMML driven by PTPN11 or NF1 is often rapidly progressive, requires swift HSCT and may benefit from pretransplant therapy with azacitidine. Because graft-versus-leukemia alloimmunity is central to cure high risk patients, the immunosuppressive regimen should be discontinued early after HSCT.

| S-EPMC8305558 | biostudies-literature

Molecular assessment of pretransplant chemotherapy in the treatment of juvenile myelomonocytic leukemia.

Project description:BACKGROUND:Despite the intensity of hematopoietic stem cell transplantation (HCT), relapse remains the most common cause of death in juvenile myelomonocytic leukemia (JMML). In contrast to other leukemias where therapy is used to reduce leukemic burden prior to transplant, many patients with JMML proceed directly to HCT with active disease. The objective of this study was to elucidate whether pre-HCT therapy has an effect on the molecular burden of disease and how this affects outcome post-HCT. PROCEDURE:Twenty-one patients with JMML who received pre-HCT therapy and were transplanted at UCSF were analyzed in this study. The mutant allele frequency of the driver mutation was assessed before and after pre-HCT therapy, using custom amplicon next-generation sequencing. RESULTS:Of the 21 patients, seven patients (33%) responded to therapy with a significant reduction in their mutant allele frequency and were classified as molecular responders. Six of these patients received moderate-intensity chemotherapy, one patient received only azacitidine. The 5-year progression-free survival after HCT of molecular responders was 100% versus 61% for nonresponders (P = .12). Survival of molecular nonresponders was not improved by use of high-intensity conditioning, but patients were salvaged if they experienced severe graft versus host disease. There were no baseline clinical characteristics that were associated with response to pre-HCT therapy. CONCLUSIONS:Despite the myelodysplastic nature of JMML, patients treated with pre-HCT therapy can achieve molecular remissions. These patients experienced a trend toward improved outcomes post-HCT. Importantly, molecular testing can be helpful to distinguish between responders and nonresponders and should become an integral part of clinical care.

| S-EPMC6754267 | biostudies-literature

Phenotypic characterization of leukemia-initiating stem cells in chronic myelomonocytic leukemia.

Project description:Chronic myelomonocytic leukemia (CMML) is a stem cell-derived neoplasm characterized by dysplasia, uncontrolled expansion of monocytes, and substantial risk to transform to secondary acute myeloid leukemia (sAML). So far, little is known about CMML-initiating cells. We found that leukemic stem cells (LSC) in CMML reside in a CD34+/CD38- fraction of the malignant clone. Whereas CD34+/CD38- cells engrafted NSGS mice with overt CMML, no CMML was produced by CD34+/CD38+ progenitors or the bulk of CD34- monocytes. CMML LSC invariably expressed CD33, CD117, CD123 and CD133. In a subset of patients, CMML LSC also displayed CD52, IL-1RAP and/or CLL-1. CMML LSC did not express CD25 or CD26. However, in sAML following CMML, the LSC also expressed CD25 and high levels of CD114, CD123 and IL-1RAP. No correlations between LSC phenotypes, CMML-variant, mutation-profiles, or clinical course were identified. Pre-incubation of CMML LSC with gemtuzumab-ozogamicin or venetoclax resulted in decreased growth and impaired engraftment in NSGS mice. Together, CMML LSC are CD34+/CD38- cells that express a distinct profile of surface markers and target-antigens. During progression to sAML, LSC acquire or upregulate certain cytokine receptors, including CD25, CD114 and CD123. Characterization of CMML LSC should facilitate their enrichment and the development of LSC-eradicating therapies.

| S-EPMC7611912 | biostudies-literature

The genomic landscape of juvenile myelomonocytic leukemia.

Project description:Juvenile myelomonocytic leukemia (JMML) is a myeloproliferative neoplasm (MPN) of childhood with a poor prognosis. Mutations in NF1, NRAS, KRAS, PTPN11 or CBL occur in 85% of patients, yet there are currently no risk stratification algorithms capable of predicting which patients will be refractory to conventional treatment and could therefore be candidates for experimental therapies. In addition, few molecular pathways aside from the RAS-MAPK pathway have been identified that could serve as the basis for such novel therapeutic strategies. We therefore sought to genomically characterize serial samples from patients at diagnosis through relapse and transformation to acute myeloid leukemia to expand knowledge of the mutational spectrum in JMML. We identified recurrent mutations in genes involved in signal transduction, splicing, Polycomb repressive complex 2 (PRC2) and transcription. Notably, the number of somatic alterations present at diagnosis appears to be the major determinant of outcome.

| S-EPMC4626387 | biostudies-literature

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