Project description:The aim of this experiment is to determine Hhex targets in the presence and absence of Myc. TGR-1 or HO15.19 cell lines were infected with a retrovirus expressing IRES-GFP (control) or Hhex-IRES-GFP. After infection, cells were GFP-sorted and total RNA extracted by a combination of Trizol and Rneasy columns.
Project description:We have cloned and characterized a fusion gene NUP98/HHEX1 resulting from t(7;10) from a patient with acute myeloid leukemia (AML). As NUP98/HHEX acts as an aberrant transcriptional activator, putative targets were searched upon transient expression of the fusion in primary murine bone marrow cells. Experiment Overall Design: Murine bone marrow cells were transduced with a retrovirus (MSCV-IRES-GFP, MIG) expressing either NUP98/HHEX or NUP98/HOXA9 (or the empty vector), mRNA was isolated after 72h. Each experiment was performed in triplicates.
Project description:Expression of key transcription factors Klf4, Oct3/4, Sox2, and c-Myc (KOSM) in embryonic stem cells can reprogram somatic cells into pluripotent cells. We found that two histone variants, TH2A and TH2B, and histone chaperone Npm enhance the KOSM-dependent generation of induced pluripotent cells (iPSCs) and produce iPSCs only with Klf4 and Oct3/4. To identify directly affected genes by these histone variants during reprogramming, we carried out gene expression profiling of MEFs overexpressing TH2A/TH2B/Npm and TH2A/TH2B deficient MEFs after infection with retroviruses expressing KOSM. A total of 21 Affymetrix Mouse Gene ST array were done for mRNA expression profiling of ES cells, iPS cells induced by Klf4, Oct4, Sox2, and c-Myc (KOSM) or Klf4, Oct4, Th2a, Th2b, and p-Npm (KOBAN), wild-type MEFs infected with retrovirus vectors expressing KOSM, KOSMBAN, or empty vector and Th2a/Th2b-deficient MEFs infected with retrovirus vector expressing KOSM.
Project description:An immortalized multipotent otic progenitor (iMOP) cell was generated by transient expression of c-Myc in Sox2-expressing otic progenitor cells. The procedure activated endogenous c-Myc expression in the cells and amplified existing Sox2-dependent transcripts to promote self-renewal. Downregulation of c-Myc expression following growth factor withdrawal resulted in a molecular switch from self-renewal to otic differentiation. Progenitor cells from embryonic inner ear that form otospheres were infected with a c-Myc retrovirus to promote self-renewal
Project description:Acute myeloid leukemia (AML) and acute T-lymphoblastic leukemia (T-ALL) maintain the undifferentiated phenotype and proliferative capacity of their respective cells of origin, hematopoietic stem/progenitor cells and immature thymocytes. The mechanisms that maintain these progenitor-like characteristics are poorly understood. We report that the transcription factor Zfx is required for the development and propagation of experimental AML caused by MLL-AF9 fusion, and of T-ALL caused by Notch1 activation. In both leukemia types, Zfx activated progenitor-associated gene expression programs and prevented differentiation. Key Zfx target genes included mitochondrial enzymes Ptpmt1 and Idh2, whose overexpression partially rescued the propagation of Zfx-deficient AML. These studies identify a common mechanism that controls the cell-of-origin characteristics of acute leukemias derived from disparate lineages and transformation mechanisms. Bone marrow progenitors (c-Kit +) from Zfx wt/y CreER mice and Zfx fl/y CreER mice were harvested after tamoxifen administration to induce Cre. The Zfx wt and Zfx ko progenitors were infected with Myc expressing and control retrovirus with GFP selectable marker and cultured for 48 hours in cytokine supplemented media. The GFP + myeloid progenitors were sorted and cultured for another 4 days prior to RNA extraction.
Project description:To identify gene expression changes associated with overexpression of miR-105 or MYC in MCF10A non-cancerous human mammary epithelial cells, we analyzed RNA isolated from engineered MCF10A cell lines that stably express empty vector, GFP, miR-105, or MYC by RNA-seq. Gene expression in cells overexpressing miR-105 or MYC was compared to cells expressing the empty vector or GFP, both of which served as controls in this experiment.
Project description:This experiment utilized rat fibroblasts that are wild-type for c-Myc (TGR-1 cells) and null for c-Myc (HO15.19 cells). Both were treated treated with rapamycin for 24 hr (comparison group, vehicle control).
