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Published on: January 23, 2019
HoxA9 binds and represses the Cebpa +8 kb enhancer.
Lei Peng1, Hong Guo1, Peilin Ma2
1Division of Pediatric Oncology, Johns Hopkins University, Baltimore, Maryland, United States of America.
HoxA9 directly represses Cebpa gene expression, particularly through the +8 kb enhancer. This repression may maintain myeloid progenitor immaturity and contribute to acute myeloid leukemia development.
Area of Science:
- Hematopoiesis
- Molecular Biology
- Cancer Biology
Background:
- C/EBPα is crucial for myeloid lineage development.
- HOXA9 is over-expressed in acute myeloid leukemia (AML) and myeloid progenitors.
Purpose of the Study:
- To investigate if HoxA9 directly represses Cebpa gene expression.
Main Methods:
- Transgenic mouse models (Vav-NUP98-HOXD13)
- Cell culture (32Dcl3, MOLM14)
- ChIP-Seq
- Gel shift assay
- Luciferase reporter assays
Main Results:
- HoxA9 represses Cebpa mRNA expression in myeloid cells.
- HoxA9 binds to the +8 kb Cebpa enhancer, inhibiting its activity.
- NUP98-HOXD13 transgenic mice show increased HoxA9 and reduced Cebpa.
Conclusions:
- HoxA9 directly represses Cebpa expression via the +8 kb enhancer.
- This mechanism may contribute to myeloid progenitor immaturity and AML pathogenesis.
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