A conditional model of MLL-AF4 B-cell tumourigenesis using invertor technology
Oncogene
|April 12, 2006
Summary
The MLL-AF4 fusion protein drives infant leukemia but isn't essential in stem cells. This study shows MLL-AF4 instructs the specific cancer cell type, not initial development.
Area of Science:
- Hematology
- Oncology
- Molecular Biology
Background:
- Chromosomal translocations involving MLL and AF4 are common in infant leukemia, leading to poor prognosis.
- The MLL-AF4 fusion protein's role in initiating leukemia and specifying B-cell tumors is not fully understood.
Purpose of the Study:
- To investigate the necessity of MLL-AF4 in hematopoietic stem cells for leukemia development.
- To determine if MLL-AF4 plays an instructive role in determining the tumor cell phenotype.
Main Methods:
- Utilized invertor conditional technology to create a mouse model with a floxed AF4 cDNA knocked into the Mll gene.
- Generated MLL-AF4 expression using cell-specific Cre recombinase.
- Analyzed the resulting neoplasms in mice.
Main Results:
- Mice exclusively developed B-cell lineage neoplasias, irrespective of the Cre promoter (B-cell or T-cell).
- The observed B-cell neoplasms exhibited a more mature phenotype than typical childhood leukemia.
- MLL-AF4 expression was not mandatory in multi-potent hematopoietic stem cells for cancer initiation.
Conclusions:
- The MLL-AF4 fusion protein does not require a role in multi-potent hematopoietic stem cells to initiate leukemia.
- MLL-AF4 plays an instructive role in specifying the phenotype of the resulting B-cell tumors.
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