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Learn MoreLeukemia is caused by the accumulation of multiple genomic lesions in hematopoietic precursor cells. However, how these events cooperate during oncogenic transformation remains poorly understood. We studied the cooperation between activated JAK3/STAT5 signaling and HOXA9 overexpression, two events identified as significantly co-occuring in T-cell acute lymphoblastic leukemia. Expression of mutant JAK3 and HOXA9 led to a rapid development of leukemia originating from multipotent or lymphoid-committed progenitors, with a significant decrease in disease latency compared to JAK3 or HOXA9 alone. Integrated RNA-seq, ChIP-seq and ATAC-seq revealed that STAT5 and HOXA9 have co-occupancy across the genome resulting in enhanced STAT5 transcriptional activity and ectopic activation of Fos/Jun (AP-1). Our data suggest that oncogenic transcription factors such as HOXA9 provide a fertile ground for specific signaling pathways to thrive, explaining why JAK/STAT pathway mutations accumulate in HOXA9 expressing cells. SOURCE: Sofie Demeyer (sofie.demeyer@kuleuven.vib.be) - Laboratory of Molecular Biology of Leukemia KULeuven / VIB
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