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Ref Type Journal Article
PMID (23138183)
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.
Journal Leukemia
Vol 27
Issue 4
Date 2013 Apr
URL
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.

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Molecular Profile Treatment Approach
KMT2A - MLLT10 DOT1L Inhibitor
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