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The ability of MLL to bind RUNX1 and methylate H3K4 at PU.1 regulatory regions is impaired by MDS/AML-associated RUNX1/AML1 mutations.

Blood | Dec 15, 2011

http://www.ncbi.nlm.nih.gov/pubmed/22012064

The mixed-lineage leukemia (MLL) H3K4 methyltransferase protein, and the heterodimeric RUNX1/CBFβ transcription factor complex, are critical for definitive and adult hematopoiesis, and both are frequently targeted in human acute leukemia. We identified a physical and functional interaction between RUNX1 (AML1) and MLL and show that both are required to maintain the histone lysine 4 trimethyl mark (H3K4me3) at 2 critical regulatory regions of the AML1 target gene PU.1. Similar to CBFβ, we show that MLL binds to AML1 abrogating its proteasome-dependent degradation. Furthermore, a subset of previously uncharacterized frame-shift and missense mutations at the N terminus of AML1, found in MDS and AML patients, impairs its interaction with MLL, resulting in loss of the H3K4me3 mark within PU.1 regulatory regions, and decreased PU.1 expression. The interaction between MLL and AML1 provides a mechanism for the sequence-specific binding of MLL to DNA, and identifies RUNX1 target genes as potential effectors of MLL function.

Pubmed ID: 22012064 RIS Download

Mesh terms: Acute Disease | Blotting, Western | Cell Line | Cell Line, Tumor | Chromatin Immunoprecipitation | Core Binding Factor Alpha 2 Subunit | Core Binding Factor beta Subunit | Gene Expression | HEK293 Cells | Histones | Humans | Leukemia, Myeloid | Lysine | Methylation | Mutation | Myelodysplastic Syndromes | Myeloid-Lymphoid Leukemia Protein | Protein Binding | Proto-Oncogene Proteins | Regulatory Sequences, Nucleic Acid | Reverse Transcriptase Polymerase Chain Reaction | Trans-Activators

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Associated grants

  • Agency: NCI NIH HHS, Id: R01 CA41456
  • Agency: NIDDK NIH HHS, Id: R01 DK 52208

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