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Aberrant ARID5B expression and its association with Ikaros dysfunction in acute lymphoblastic leukemia
Zheng Ge1,2, Qi Han3,4, Yan Gu3,4
1Department of Hematology, Zhongda Hospital Southeast University, Institute of Hematology Southeast University, 210009, Nanjing, China. Janege879@hotmail.com.
Oncogenesis
|November 14, 2018
Summary
AT-rich interactive domain-containing protein 5B (ARID5B) is down-regulated in acute lymphoblastic leukemia (ALL). Low ARID5B expression, especially with PHF2, correlates with proliferation and poor prognosis in ALL patients.
Area of Science:
- Hematology
- Molecular Biology
- Oncology
Background:
- Mutations in AT-rich interactive domain-containing protein 5B (ARID5B) are linked to acute lymphoblastic leukemia (ALL) oncogenesis and treatment.
- The expression and clinical significance of ARID5B in ALL are not fully understood.
Purpose of the Study:
- To investigate the expression levels of ARID5B in ALL.
- To explore the clinical significance of ARID5B and its interaction with PHD finger protein 2 (PHF2) in ALL prognosis.
- To elucidate the regulatory mechanism of ARID5B expression in ALL.
Main Methods:
- Quantitative analysis of ARID5B expression in ALL patient samples compared to healthy controls.
- Correlation analysis of ARID5B and PHF2 expression with clinical parameters and prognostic markers.
- Investigation of the regulatory role of Ikaros and Casein Kinase II in ARID5B expression, including histone modifications.
Main Results:
- ARID5B is significantly downregulated in ALL compared to healthy bone marrow.
- Low ARID5B expression (ARID5Blow) or combined low ARID5B and PHF2 expression (ARID5BlowPHF2low) correlates with increased cell proliferation markers and poor prognosis in ALL.
- Ikaros directly regulates ARID5B expression, and Casein Kinase II inhibition promotes ARID5B expression via H3K4me3 enrichment at the promoter.
Conclusions:
- Aberrant ARID5B and PHF2 expression are associated with leukemic cell proliferation and poor prognostic indicators in ALL.
- ARID5Blow and ARID5BlowPHF2low expression are linked to Ikaros dysfunction and contribute to the oncogenesis of high-risk ALL.
- These findings identify ARID5BlowPHF2low as a potential biomarker for a high-risk ALL subgroup.
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