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Two critical hits for promyelocytic leukemia
L Z He1, M Bhaumik, C Tribioli
1Department of Human Genetics and Molecular Biology Program Memorial Sloan-Kettering Cancer Center Sloan-Kettering Institute, New York, NY 10021, USA.
Molecular Cell
|December 7, 2000
Summary
Both RARalpha-PLZF and PLZF-RARalpha fusion proteins are crucial for acute promyelocytic leukemia (APL) development. The interaction between these proteins and PLZF transcriptional repression is key to APL pathogenesis.
Area of Science:
- Hematology
- Molecular Biology
- Cancer Genetics
Background:
- Acute promyelocytic leukemia (APL) is characterized by specific chromosomal translocations involving the RARalpha gene.
- These translocations result in the formation of reciprocal fusion proteins, such as PML-RARalpha and PLZF-RARalpha.
Purpose of the Study:
- To investigate the role of both RARalpha-PLZF and PLZF-RARalpha fusion proteins in APL pathogenesis.
- To determine the functional significance of RARalpha-PLZF in interfering with PLZF transcriptional repression.
Main Methods:
- Generation of transgenic mice expressing RARalpha-PLZF and PLZF-RARalpha fusion proteins.
- Analysis of leukemia development and APL-specific features in genetically modified mice.
- Assessment of the impact of RARalpha-PLZF on PLZF transcriptional repression.
Main Results:
- Transgenic mice expressing only PLZF-RARalpha did not develop leukemia with classic APL features.
- Mice expressing both PLZF-RARalpha and RARalpha-PLZF developed leukemia with hallmark APL characteristics.
- RARalpha-PLZF was shown to interfere with PLZF's transcriptional repression activity.
Conclusions:
- Both reciprocal fusion proteins resulting from the translocation are essential for the development of APL.
- The interference of RARalpha-PLZF with PLZF transcriptional repression is a critical mechanism in APL pathogenesis.