| First Author | Dorrance AM | Year | 2008 |
| Journal | Blood | Volume | 112 |
| Issue | 6 | Pages | 2508-11 |
| PubMed ID | 18617636 | Mgi Jnum | J:138860 |
| Mgi Id | MGI:3806732 | Doi | 10.1182/blood-2008-01-134338 |
| Citation | Dorrance AM, et al. (2008) The Mll partial tandem duplication: differential, tissue-specific activity in the presence or absence of the wild-type allele. Blood 112(6):2508-11 |
| abstractText | The partial tandem duplication of MLL (MLL-PTD) is found in 5% to 10% of patients with acute myeloid leukemia (AML) and normal cytogenetics. Its expression in leukemic blasts is coincident with a silenced wild-type (WT) MLL allele. We therefore generated mice expressing the Mll-PTD in the absence of Mll-WT. These Mll(PTD/-) mice die at birth unlike the normal life expectancy of Mll(PTD/WT), Mll(WT/-), and Mll(WT/WT) mice. Using Mll(WT/WT) fetal liver cells (FLC) as baseline, we compared Mll(PTD/-) with Mll(PTD/WT) FLC and found both had increased HoxA gene expression and granulocyte-macrophage colony-forming progenitor cells (CFU-GM); in contrast, only Mll(PTD/WT) FLC had increased pluripotent hemopoietic progenitors (CFU-GEMM). The similarities between Mll(PTD/WT) and Mll(PTD/-) mice suggest that the Mll-PTD mutation can up-regulate target genes in a dominant, gain-of-function fashion. The differences between these 2 genotypes suggest that in select tissues the Mll-PTD requires cooperation with the Mll-WT in the genesis of the observed abnormality. |
