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Identification of genome wide Hoxa9 binding sites in primary murine and human AML cells

ABSTRACT: Identification of genome wide Hoxa9 binding sites in primary murine and human AML cells

PROVIDER: PRJEB28124 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR2730130.fastq.gz	Fastqsanger.gz
	ERR2730131.fastq.gz	Fastqsanger.gz
	ERR2730132.fastq.gz	Fastqsanger.gz
	ERR2730133.fastq.gz	Fastqsanger.gz
	ERR2730134.fastq.gz	Fastqsanger.gz

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Identification of genome wide Hoxa9 binding sites in primary murine and human AML cells

Project description:Relative overexpression of HOXA9 is a key feature of aggressive AML (acute myeloid leukemia). Here we determined genome wide binding sites of Hoxa9 in primary murine cells transformed by Hoxa9 and in a human AML cell line. In addition global H3K4 monomethylation and H3K27acetylation levels were determined in cells transformed by an inducible Hoxa9-ER construct in Hoxa9-active conditions and 72h after Hoxa9 was inactivated.

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Project description:The clustered homeobox proteins play crucial roles in development, hematopoiesis and leukemia yet the targets they regulate and their mechanisms of action are poorly understood. Here, we identified the binding sites for Hoxa9 and the Hox cofactor Meis1 on a genome-wide level and profiled their associated epigenetic modifications and transcriptional targets. Hoxa9 and the Hox cofactor Meis1 co-bind at hundreds of highly evolutionarily-conserved sites, most of which are distant from transcription start sites. These sites show high levels of histone H3K4 monomethylation and CBP/P300 binding characteristic of enhancers. Furthermore, a subset of these sites shows enhancer activity in transient transfection assays. Many Hoxa9 and Meis1 binding sites are also bound by PU.1 and other lineage-restricted transcription factors previously implicated in establishment of myeloid enhancers. Conditional Hoxa9 activation is associated with CBP/P300 recruitment, histone acetylation and transcriptional activation of a network of proto-oncogenes including Erg, Flt3, Lmo2, Myb and Sox4. Collectively this work suggests that Hoxa9 regulates transcription by interacting with enhancers of genes important for hematopoiesis and leukemia. To identify the genome-wide binding sites for Hoxa9 and the Hox cofactor Meis1

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The Growth factor independence 1 (GFI1) 36N variant predisposes to Acute Myeloid Leukemia (AML) by inducing epigenetic changes at the Hoxa9 locus

Project description:GFI136N is a coding Single Nucleotide Polymorphism (SNP) in the gene GFI1 that increases the risk for Acute myeloid leukemia (AML) by 60%. It is present in 3-5% of Caucasians and has a prevalence of 12% among AML patients. We generated knockin mice expressing either the human GFI136N variant or the more common GFI136S form and observed that GFI136N, in contrast to GFI136S, lacked the ability to bind to the Gfi1 target gene and leukemia associated transcription factor Hoxa9 in myeloid precursors and failed to initiate the histone modifications that regulate HoxA9 expression. Consistent with this, GFI136N heterozygous AML patients showed increased HOXA9 expression compared to control patients. In the knockin mice, granulo-monocytic pogenitors (GMPs), a bone marrow subset from which AML can arise, show a proliferative expansion in the presence of the GFI136N variant. Finally, the GFI136N variant increased colony formation and proliferation of myeloid precursors induced by the onco-fusion proteins MLL/AF9 or AML1/Eto9a and accelerated the onset of a KRAS-driven myelo-proliferative disease. Our data suggest that GFI136N predisposes to AML by deregulating the expression of Hoxa9, a locus highly relevant for AML, thereby inducing a pre-leukemic state in myeloid precursors that can give rise to AML. 3 samples (2 histone modifications, 1 transcription factor)

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