Project description:Members of the GATA protein family play important roles in lineage specification and transdifferentiation. Previous reports show that some members of GATA protein family also can induce pluripotency in somatic cells by substituting for the key pluripotency-associated factor Oct4. However, the mechanism that links the lineage specifying cues and activation of pluripotency remains elusive. Here, we report that all GATA family members can substitute for Oct4 to induce pluripotency. We found that all members of the GATA family can inhibit elevated ectodermal-lineage genes, which is consistent with previous reports that a balance of different lineage-specifying forces is important for restoration of pluripotency. A conserved DNA-binding domain in the C-terminal zinc finger is critical for the GATA family to induce pluripotency. Using RNA-seq and ChIP-seq we identified that the pluripotency-related gene Sall4 is a direct target of GATA family members during reprogramming, serving as a bridge linking the lineage-specific GATA family to the pluripotency circuit. Thus, the GATA family is the first family of proteins wherein all members can function as inducers of the reprogramming process that can substitute for Oct4. Our results suggest that the roles of the GATA family in reprogramming have been greatly underestimated, and that the GATA family may serve as a general mediator for cell fate conversion.
Project description:To evaluate the effect on lincRNA expression by p53 family members, we overexpressed p53 family members in H1299 cells and evaluated the lincRNA expression by microarray analysis.
Project description:IL22 induces antimicrobial peptides which influnce microbiota. We used 16s rRNA gene sequencing (16s DNA-seq) to analyze the microbiota with Fc or IL-22Fc treatment.
Project description:Yeast DNA microarray was used to assess and compare the global expression profile of strains harboring different family members of the major cytosolic Hsp70 family. Viability of a yeast strain deleted for all genes encoding members of the Hsp70-Ssa family (Ssa1/2/3/4) was maintained by the presence of a single Ssa family member expressed ectopically from a plasmid vector. The Hsp70-Ssa family constitutes the main source of Hsp70 molecular chaperone activity in the yeast cell. A yeast cell must actively express a member of this family to remain viable. Hsp70-Ssa are highly conserved both within yeast and amongst other species. Ssa1 and 2 are 97% identical at amino acid level and 80% identical to Ssa3 and 4. The aim of this study was to attribute specific functions to single Ssa family members by identifying specific genes or gene families whose expression was altered in the presence (or absence) of Ssa family members.
Project description:To evaluate the effect on lincRNA expression by p53 family members, we overexpressed p53 family members in H1299 cells and evaluated the lincRNA expression by microarray analysis. lincRNA expression was measured in H1299 cells infected with adenovirus expressing LacZ, p53, p63a, p63g, p73a and p73b.
Project description:The p53 family comprises the tumor suppressor p53 and the structural homologs p63 and p73. How the three family members cooperate in tumor suppression remains unclear. Here, we report different but complementary functions of the individual members for regulating retinoblastoma protein (RB) function during myogenic differentiation. Whereas p53 transactivates the retinoblastoma gene, p63 and p73 induce the cyclin-dependent kinase inhibitor p57 to maintain RB in an active, hypophosphorylated state. DeltaNp73 inhibits these functions of the p53 family in differentiation control, prevents myogenic differentiation, and enables cooperating oncogenes to transform myoblasts to tumorigenicity. DeltaNp73 is frequently overexpressed in rhabdomyosarcoma and essential for tumor progression in vivo. These findings establish differentiation control as a key tumor suppressor activity of the p53 family. Keywords: oligonucleotide
Project description:Yeast DNA microarray was used to assess and compare the global expression profile of strains harboring different family members of the major cytosolic Hsp70 family. Viability of a yeast strain deleted for all genes encoding members of the Hsp70-Ssa family (Ssa1/2/3/4) was maintained by the presence of a single Ssa family member expressed ectopically from a plasmid vector. The Hsp70-Ssa family constitutes the main source of Hsp70 molecular chaperone activity in the yeast cell. A yeast cell must actively express a member of this family to remain viable. Hsp70-Ssa are highly conserved both within yeast and amongst other species. Ssa1 and 2 are 97% identical at amino acid level and 80% identical to Ssa3 and 4. The aim of this study was to attribute specific functions to single Ssa family members by identifying specific genes or gene families whose expression was altered in the presence (or absence) of Ssa family members. Eight independent RNA samples were pooled to represent a single biological sample for expression analysis. For example, the single sample analyzed for cells harboring only Ssa1 is a pooled sample of eight independent RNA extractions. Hybridization was performed for cells harboring either Ssa1, Ssa2, Ssa3 or Ssa4 as the sole cytosolic Hsp70-Ssa family member. Gene expression profiles of Ssa2/3/4 were all compared to Ssa1.