Over the past decade, genomic studies have identified a number of novel and recurrent somatic mutations that affect epigenetic patterning in patients with myeloid malignancies, including myeloproliferative neoplasms, myelodysplastic syndrome, and acute myeloid leukemia. Many of these mutations occur in genes with established roles in the regulation and maintenance of DNA methylation and/or chromatin modifications in hematopoietic stem/progenitor cells. Subsequent genetic and functional studies have revealed that these mutations affect epigenetic patterning in myeloid diseases. In this review, we discuss historical and recent studies implicating epigenetic modifiers in the development and evolution of the various myeloid malignancies and discuss how this knowledge has and will lead to future clinical and biologic insights.
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