Similar Datasets
Project description:MafA and MafB transcription factors have been shown to be key regulators of insulin and glucagon transcription. MafB is essential for alpha and beta cell differentiation, as MafB deficient mice produced fewer insulin+ and glucagon+ cells during development, with MafA expressed in remaining insulin+ cells. In contrast, beta cell development was reported to be normal in a total MafA knock out, although the animals developed beta cell dysfunction and diabetes as adults. However, we have found that MafB expression is elevated during development and retained in adult insulin+ cells after conditional removal of MafA in the pancreas. These studies will evaluate the broader significance of these insulin and glucagon regulators in alpha and beta cell development and function. Our efforts will focus on determining if the concerted actions of MafA and MafB factors are significant to beta cell formation, and we specifically plan to: Determine how alpha and beta cell differentiation is affected in MafA/MafB compound mutant mice during pancreas development. cDNA microarray studies (pancchip 6.0) with wild type, MafAKO, MafB-/-, and MafAKOMafB-/- mutant E18.5 pancreata will be performed to comprehensively identify genes controlled by MafA and MafB in developing alpha and beta cells.
2014-11-04 | E-MTAB-3070 | biostudies-arrayexpress
Project description:PacBio sequencing of Macaca fascicularis MHC class II genes.
| PRJEB19948 | ENA
Project description:αβ T cell receptor (TCR) V(D)J genes code for billions of TCR combinations. However only some appear on peripheral T cells in any individual because, to mature, thymocytes must react with low affinity but not high affinity with thymus expressed MHC/peptides. MHC proteins are very polymorphic. Different alleles bind different peptides. Therefore any individual might express many different MHC alleles to ensure that some peptides from an invader are bound to MHC and activate T cells. However, most individuals express limited numbers of MHC alleles. To explore this we compared the TCR repertoires of naïve, CD4 T cells in mice expressing one or two MHC II alleles. Surprisingly, the TCRs in heterozygotes were less diverse that those in the sum of their MHC II homozygous relatives. Our results suggest that thymus negative selection cancels out the advantages of increased thymic positive selection in the MHC heterozygotes.
2024-06-16 | GSE269649 | GEO
Project description:Transformation of Chicken Embryo fibroblast by MafA is dependent on its phosphorylation status. Using microarray analysis, we identify a gene expression subprogram regulated by MafA phosphorylation. Keywords: phosphorylation mediated transcriptional regulation
2007-12-25 | GSE9045 | GEO
Project description:MHC class II alleles in Great Apes
| PRJEB27405 | ENA
Project description:Rapid advances in biochemical technologies have enabled several strategies for typing candidate HLA alleles, but linking them into a single MHC haplotype structure remains challenging. Here we have developed a multi-loci haplotype phasing technique and demonstrate its utility towards phasing of MHC and KIR loci in human samples. We accurately (~99%) reconstruct the complete haplotypes for over 90% of sequence variants spanning the 4-megabase region of these two loci. By haplotyping a majority of coding and non-coding alleles at the MHC and KIR loci in a single assay, this method has the potential to assist transplantation matching and facilitate investigation of the genetic basis of human immunity and disease. Complete haplotype phasing of 2 loci (MHC and KIR) in 1 human cell line.
2016-02-01 | E-GEOD-65726 | biostudies-arrayexpress
Project description:Global gene expression profiling identifies accelerated induction of genes upon PDX1, NGN3 and MAFA transduction.
2019-07-03 | GSE133731 | GEO
Project description:Rapid advances in biochemical technologies have enabled several strategies for typing candidate HLA alleles, but linking them into a single MHC haplotype structure remains challenging. Here we have developed a multi-loci haplotype phasing technique and demonstrate its utility towards phasing of MHC and KIR loci in human samples. We accurately (~99%) reconstruct the complete haplotypes for over 90% of sequence variants spanning the 4-megabase region of these two loci. By haplotyping a majority of coding and non-coding alleles at the MHC and KIR loci in a single assay, this method has the potential to assist transplantation matching and facilitate investigation of the genetic basis of human immunity and disease.
2016-02-01 | GSE65726 | GEO
Project description:Type 2 diabetes (T2D) is associated with compromised identity of insulin-producing pancreatic islet beta (β) cells, characterized by inappropriate production of other islet cell-enriched hormones. Here we examined how hormone misexpression was influenced by the MAFA and MAFB transcription factors, closely related proteins that maintain islet cell function. Mice specifically lacking MafA in β cells demonstrated broad, population-wide changes in hormone gene expression with an overall gene signature closely resembling islet gastrin (Gast)-positive cells generated under conditions of chronic hyperglycemia and obesity. A human b cell line deficient in MAFB, but not one lacking MAFA, also produced a gastrin (GAST)-positive gene expression pattern. In addition, GAST was detected in human T2D β cells with low levels of MAFB. Moreover, evidence is provided that human MAFB can directly repress GAST gene transcription. These results support a novel, species-specific role for MafA and MAFB in maintaining adult mouse and human β cell identity, respectively, by repressing expression of Gast/GAST and other non-b cell hormones.
2023-05-01 | GSE230728 | GEO