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Polycomb repressor complex 2 regulates HOXA9 and HOXA10, activating ID2 in NK/T-cell lines
Stefan Nagel1, Letizia Venturini, Victor E Marquez
1Dept. of Human and Animal Cell Lines, DSMZ - German Collection of Microorganisms and Cell Cultures, Inhoffenstr. 7B, 38124 Braunschweig, Germany. sna@dsmz.de
Molecular Cancer
|June 23, 2010
Summary
Aberrant expression of NK-cell differentiation factors HOXA9, HOXA10, and ID2, regulated by Polycomb Repressor Complex 2 (PRC2), contributes to T-cell acute lymphoblastic leukemia (T-ALL) development.
Area of Science:
- Hematology
- Molecular Biology
- Cancer Research
Background:
- Natural killer (NK) and T-cells are related lymphocytes originating from common progenitors.
- Deregulation of developmental genes during hematopoiesis can lead to leukemogenesis.
- This study investigates aberrant gene expression in T-cell acute lymphoblastic leukemia (T-ALL) by comparing NK- and T-cell expression profiles.
Purpose of the Study:
- Identify aberrantly expressed genes in T-ALL.
- Determine the role of NK-cell differentiation factors in T-ALL pathogenesis.
- Elucidate the regulatory mechanisms, including Polycomb Repressor Complex 2 (PRC2), involved in T-ALL.
Main Methods:
- Comparative gene expression profiling of NK- and T-cell lines.
- Overexpression studies and chromatin immunoprecipitation assays.
- Analysis of Polycomb Repressor Complex 2 (PRC2) components and their targets.
Main Results:
- HOXA9, HOXA10, and ID2 showed high expression in T-ALL cell lines and were activated by HOXA9/10.
- These factors repressed the apoptosis factor BIM.
- PRC2, specifically EZH2, was found to repress HOXA10, and its dysregulation was linked to T-ALL, involving TFDP1 and HOP.
Conclusions:
- NK-cell differentiation factors (HOXA9, HOXA10, ID2) are dysregulated by PRC2 in T-ALL.
- PRC2-mediated regulation of these factors contributes to T-cell leukemogenesis.
- Understanding these mechanisms offers potential therapeutic targets for T-ALL.
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