Project description:CUT&Tag technology were used for high-throughput profiling of RARG fusion genes or PML-RARA with core promoters of its target genes in hCD34+ cells with RARG fusion genes or PML-RARA overexpression. We first expressed HA-tagged X-RARG fusions or HA-tagged PML-RARA in hCD34+ cells and then performed CUT&Tag with antibody to RARG fusion genes or PML-RARA and analyzed the binding of RARG fusion genes or PML-RARA with core promoters of its target genes. Common peaks for the binding sites of RARG fusions and PML-RARA and unique peaks for specific targets of RARG fusions that are not targets of PML-RARA were identified.
Project description:Currently, AML with RARG rearrangements (RARG AML), including NUP98-RARG, PML-RARG, CPSF6-RARG, NPM1-RARG, and HNRNPC-RARG, has been identified as a novel entity of AML. Overexpression of RARG fusions in human CD34+ cells promoted the expansion of immature myeloid cells, reduced the percentage of mature granulocytes, inhibited the differentiation of myeloid cells, and self-renewal abilities of hCD34+ cells. To understand how RARG fusion proteins regulate their target genes in the hematopoietic system, we first expressed HA-tagged X-RARG fusions or HA-tagged PML-RARA in hCD34+ cells. We then analyzed the differential genes expression in hCD34+ cells with or without RARG fusion genes or PML-RARA overexpression through RNA-seq.
Project description:To understand how RARG fusion proteins regulate their target genes in the hematopoietic system, we overexpressed fusions or PML-RARA in hCD34+ cells and identified target genes that are regulated by RARG fusions. We found that RARG fusions selectively upregulated BCL2 and ATF3 in HSPCs, driving uncontrolled proliferation and disrupting the differentiation of RARG-AML cells.To investigate the mechanism how RARG fusions mediate activation of their downstream targets such as BCL2 and ATF3, we dected the epigenetic changes (H3K27ac, H3K4me1, and H3K4me3) associated with RARG fusions binding in hCD34+ cells overexpressing CPSF6::RARG and NUP98::RARG.
Project description:We found that CPSF6-RARG fusion gene drives the aberrant expansion of HSCs and progenitor cells, which may lead to a preleukemic phenotype. Moreover, wt1 haploinsufficiency cooperates with RARG fusions to induce AML. To investigate the mechanism by which Wt1 haploinsufficiency cooperates with RARG fusion overexpression to induce AML in vivo, we analyzed the gene expression profiles of leukemia cells isolated from CreMx-1;CPSF6-RARG mice and Wt1F/+CreMx-1;CPSF6-RARG mice through RNA-seq.
Project description:We found that RARG fusions selectively upregulated BCL2 and ATF3 in HSPCs, driving uncontrolled proliferation and disrupting the differentiation of RARG-AML cells.To investigate the mechanism how RARG fusions mediate activation of their downstream targets such as BCL2 and ATF3, we defined the chromatin accessibility using ATAC-seq assay in human CD34+ (hCD34+) cells with or without CPSF6::RARG or NUP98::RARG overexpression.
Project description:Expression levels of retinoic acid receptor gamma (NR1B3/RARG, encodes RARG), are commonly reduced in prostate cancer (PCa). Therefore we sought to establish the cellular and gene regulatory consequences of reduced RARG expression, and determine RARG regulatory mechanisms. RARG shRNA approaches in non-malignant (RWPE-1 and HPr1-AR) and malignant (LNCaP) prostate models revealed that reducing RARG levels, rather than adding exogenous retinoid ligand, had the greatest impact on prostate cell viability and gene expression. ChIP-Seq defined the RARG cistrome which was significantly enriched at active enhancers associated with AR binding sites. Reflecting a significant genomic role for RARG to regulate androgen signaling, RARG knockdown in HPr1-AR cells significantly regulated the magnitude of the AR transcriptome. RARG down-regulation was explained by increased miR-96 in PCa cell and mouse models, and TCGA PCa cohorts. Biochemical approaches confirmed that miR-96 directly regulated RARG expression and function. Capture of the miR-96 targetome by biotin-miR96 identified that RARG and a number of RARG interacting co-factors including TACC1 were all targeted by miR-96, and expression of these genes were prominently altered, positively and negatively, in the TCGA-PRAD cohort. Differential gene expression analyses between tumors in the TCGA-PRAD cohort with lower quartile expression levels of RARG and TACC1 and upper quartile miR-96, compared to the reverse, identified a gene network including several RARG target genes (e.g. SOX15) that significantly associated with worse disease free survival (hazard ratio 2.23, 95% CI 1.58 to 2.88, p=0.015). In summary, miR-96 targets a RARG network to govern AR signaling, PCa progression and disease outcome. ChIP-seq: RWPE-1-BAC-RARG-EGFP non-malignant, immortalized cell line infected with BAC-RARG-EGFP, +/- 10nM CD437 for 2 hours
