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|Ref Type||Journal Article|
|Authors||Chen L, Deshpande AJ, Banka D, Bernt KM, Dias S, Buske C, Olhava EJ, Daigle SR, Richon VM, Pollock RM, Armstrong SA|
|Title||Abrogation of MLL-AF10 and CALM-AF10-mediated transformation through genetic inactivation or pharmacological inhibition of the H3K79 methyltransferase Dot1l.|
|Abstract Text||The t(10;11)(p12;q23) translocation and the t(10;11)(p12;q14) translocation, which encode the MLL (mixed lineage leukemia)-AF10 and CALM (clathrin assembly lymphoid myeloid leukemia)-AF10 fusion oncoproteins, respectively, are two recurrent chromosomal rearrangements observed in patients with acute myeloid leukemia and acute lymphoblastic leukemia. Here, we demonstrate that MLL-AF10 and CALM-AF10-mediated transformation is dependent on the H3K79 methyltransferase Dot1l using genetic and pharmacological approaches in mouse models. Targeted disruption of Dot1l using a conditional knockout mouse model abolished in vitro transformation of murine bone marrow cells and in vivo initiation and maintenance of MLL-AF10 or CALM-AF10 leukemia. The treatment of MLL-AF10 and CALM-AF10 transformed cells with EPZ004777, a specific small-molecule inhibitor of Dot1l, suppressed expression of leukemogenic genes such as Hoxa cluster genes and Meis1, and selectively impaired proliferation of MLL-AF10 and CALM-AF10 transformed cells. Pretreatment with EPZ004777 profoundly decreased the in vivo spleen-colony-forming ability of MLL-AF10 or CALM-AF10 transformed bone marrow cells. These results show that patients with leukemia-bearing chromosomal translocations that involve the AF10 gene may benefit from small-molecule therapeutics that inhibit H3K79 methylation.|
|Gene Name||Source||Synonyms||Protein Domains||Gene Description||Gene Role|
|Therapy Name||Drugs||Efficacy Evidence||Clinical Trials|
|Drug Name||Trade Name||Synonyms||Drug Classes||Drug Description|
|Gene||Variant||Impact||Protein Effect||Variant Description||Associated with drug Resistance|
|Molecular Profile||Indication/Tumor Type||Response Type||Therapy Name||Approval Status||Evidence Type||Efficacy Evidence||References|
|KMT2A - MLLT10||leukemia||sensitive||EPZ004777||Preclinical||Actionable||In a preclinical study, transformed cells expressing the fusion, KMT2A-MLLT10, demonstrated sensitivity to EPZ004777 in culture and in mouse models, resulting in cell cycle arrest, increased apoptotic activity, and inhibition of cell proliferation (PMID: 23138183).||23138183|