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Published in: Journal of Hematology & Oncology 1/2016

Open Access 01-12-2016 | Research

Silencing of GATA3 defines a novel stem cell-like subgroup of ETP-ALL

Authors: L. Fransecky, M. Neumann, S. Heesch, C. Schlee, J. Ortiz-Tanchez, S. Heller, M. Mossner, S. Schwartz, L. H. Mochmann, K. Isaakidis, L. Bastian, U. R. Kees, T. Herold, K. Spiekermann, N. Gökbuget, C. D. Baldus

Published in: Journal of Hematology & Oncology | Issue 1/2016

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Abstract

Background

GATA3 is pivotal for the development of T lymphocytes. While its effects in later stages of T cell differentiation are well recognized, the role of GATA3 in the generation of early T cell precursors (ETP) has only recently been explored. As aberrant GATA3 mRNA expression has been linked to cancerogenesis, we investigated the role of GATA3 in early T cell precursor acute lymphoblastic leukemia (ETP-ALL).

Methods

We analyzed GATA3 mRNA expression by RT-PCR (n = 182) in adult patients with T-ALL. Of these, we identified 70 of 182 patients with ETP-ALL by immunophenotyping. DNA methylation was assessed genome wide (Illumina Infinium® HumanMethylation450 BeadChip platform) in 12 patients and GATA3-specifically by pyrosequencing in 70 patients with ETP-ALL. The mutational landscape of ETP-ALL with respect to GATA3 expression was investigated in 18 patients and validated by Sanger sequencing in 65 patients with ETP-ALL. Gene expression profiles (Affymetrix Human genome U133 Plus 2.0) of an independent cohort of adult T-ALL (n = 83) were used to identify ETP-ALL and investigate GATA3low and GATA3high expressing T-ALL patients. In addition, the ETP-ALL cell line PER-117 was investigated for cytotoxicity, apoptosis, GATA3 mRNA expression, DNA methylation, and global gene expression before and after treatment with decitabine.

Results

In our cohort of 70 ETP-ALL patients, 33 % (23/70) lacked GATA3 expression and were thus defined as GATA3low. DNA methylation analysis revealed a high degree of GATA3 CpG island methylation in GATA3low compared with GATA3high ETP-ALL patients (mean 46 vs. 21 %, p < 0.0001). Genome-wide expression profiling of GATA3low ETP-ALL exhibited enrichment of myeloid/lymphoid progenitor (MLP) and granulocyte/monocyte progenitor (GMP) genes, while T cell-specific signatures were downregulated compared to GATA3high ETP-ALL. Among others, FLT3 expression was upregulated and mutational analyses demonstrated a high rate (79 %) of FLT3 mutations. Hypomethylating agents induced reversal of GATA3 silencing, and gene expression profiling revealed downregulation of hematopoietic stem cell genes and upregulation of T cell differentiation.

Conclusions

We propose GATA3low ETP-ALL as a novel stem cell-like leukemia with implications for the use of myeloid-derived therapies.
Appendix
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Metadata
Title
Silencing of GATA3 defines a novel stem cell-like subgroup of ETP-ALL
Authors
L. Fransecky
M. Neumann
S. Heesch
C. Schlee
J. Ortiz-Tanchez
S. Heller
M. Mossner
S. Schwartz
L. H. Mochmann
K. Isaakidis
L. Bastian
U. R. Kees
T. Herold
K. Spiekermann
N. Gökbuget
C. D. Baldus
Publication date
01-12-2016
Publisher
BioMed Central
Published in
Journal of Hematology & Oncology / Issue 1/2016
Electronic ISSN: 1756-8722
DOI
https://doi.org/10.1186/s13045-016-0324-8

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Webinar | 19-02-2024 | 17:30 (CET)

Keynote webinar | Spotlight on antibody–drug conjugates in cancer

Antibody–drug conjugates (ADCs) are novel agents that have shown promise across multiple tumor types. Explore the current landscape of ADCs in breast and lung cancer with our experts, and gain insights into the mechanism of action, key clinical trials data, existing challenges, and future directions.

Dr. Véronique Diéras
Prof. Fabrice Barlesi
Developed by: Springer Medicine