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ASXL1 Mutations Promote Myeloid Transformation Through Loss of PRC2-Mediated Gene Repression

GSE38861 Homo sapiens Genome binding/occupancy profiling by high throughput sequencing 9 samples Submitted 2012/08/21 Platform GPL9052
Summary
Recurrent somatic ASXL1 mutations occur in patients with myelodysplasia (MDS), myeloproliferative neoplasms (MPN), and acute myeloid leukemia (AML), and are associated with adverse outcome. Despite the genetic and clinical data implicating ASXL1 mutations in myeloid malignancies, the mechanisms of transformation by ASXL1 mutations are not understood. Here we identify that ASXL1 mutations result in loss of PRC2-mediated histone H3 lysine 27 (H3K27) tri-methylation. Through integration of microarray data with genome-wide histone modification ChIP-Seq data we identify targets of ASXL1 repression including the posterior HOXA cluster that is known to contribute to myeloid transformation. We demonstrate that ASXL1 associates with the Polycomb repressive complex 2 (PRC2), and that loss of ASXL1 in vivo collaborates with NRASG12D to promote myeloid leukemogenesis.
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Also filed as BioProject PRJNA169078 and SRA study SRP013855. Searching any of these in the dataset finder brings you back here.

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