Aberrant activation of the GIMAP enhancer by oncogenic transcription factors in T-cell acute lymphoblastic leukemia

The transcription factor TAL1/SCL is one of the most prevalent oncogenes in T-cell acute lymphoblastic leukemia (T-ALL), a malignant disorder resulting from leukemic transformation of thymus T-cell precursors. TAL1 is normally expressed in hematopoietic stem cells (HSCs) but is silenced in immature...

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Veröffentlicht in:Leukemia 2017-08, Vol.31 (8), p.1798-1807
Hauptverfasser: Liau, W S, Tan, S H, Ngoc, P C T, Wang, C Q, Tergaonkar, V, Feng, H, Gong, Z, Osato, M, Look, A T, Sanda, T
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container_end_page 1807
container_issue 8
container_start_page 1798
container_title Leukemia
container_volume 31
creator Liau, W S
Tan, S H
Ngoc, P C T
Wang, C Q
Tergaonkar, V
Feng, H
Gong, Z
Osato, M
Look, A T
Sanda, T
description The transcription factor TAL1/SCL is one of the most prevalent oncogenes in T-cell acute lymphoblastic leukemia (T-ALL), a malignant disorder resulting from leukemic transformation of thymus T-cell precursors. TAL1 is normally expressed in hematopoietic stem cells (HSCs) but is silenced in immature thymocytes. We hypothesize that TAL1 contributes to leukemogenesis by activating genes that are normally repressed in immature thymocytes. Herein, we identified a novel TAL1-regulated super-enhancer controlling the GIMAP locus, which resides within an insulated chromosomal locus in T-ALL cells. The GIMAP genes are expressed in HSCs and mature T cells but are downregulated during the immature stage of thymocyte differentiation. The GIMAP enhancer is activated by TAL1, RUNX1 and GATA3 in human T-ALL cells but is repressed by E-proteins. Overexpression of human GIMAP genes in immature thymocytes alone does not induce tumorigenesis but accelerates leukemia development in zebrafish. Our results demonstrate that aberrant activation of the GIMAP enhancer contributes to T-cell leukemogenesis.
doi_str_mv 10.1038/leu.2016.392
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identifier ISSN: 0887-6924
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issn 0887-6924
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subjects 13/106
14/63
38
631/136/232/2058
631/67/1990/283/2125
631/67/395
631/67/68
64/116
692/420/755
Aberration
Activation
Acute lymphoblastic leukemia
Acute lymphocytic leukemia
Animals
Basic Helix-Loop-Helix Transcription Factors - physiology
Cancer Research
Care and treatment
Cell Line, Tumor
Critical Care Medicine
Differentiation
Enhancer Elements, Genetic - physiology
GATA-3 protein
Genes
Genetic transformation
GTP-Binding Proteins - genetics
Hematology
Hematopoietic stem cells
Humans
Intensive
Internal Medicine
Leukemia
Leukemogenesis
Loci
Lymphatic leukemia
Lymphocytes
Lymphocytes T
Medicine
Medicine & Public Health
Membrane Proteins - genetics
Mice
Mice, Inbred C57BL
Multigene Family
Oncology
original-article
Precursor T-Cell Lymphoblastic Leukemia-Lymphoma - etiology
Precursor T-Cell Lymphoblastic Leukemia-Lymphoma - genetics
Proteins
Proto-Oncogene Proteins - physiology
Runx1 protein
Stem cells
T cell receptors
T cells
T-Cell Acute Lymphocytic Leukemia Protein 1
Thymocytes
Thymus
Transcription factors
Transcription Factors - physiology
Tumorigenesis
Zebrafish
title Aberrant activation of the GIMAP enhancer by oncogenic transcription factors in T-cell acute lymphoblastic leukemia
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