Similar Datasets
Project description:Sir2-family of NAD-dependent histone deacetylases are involved in gene transcription repression in yeast. The C. glabrata genes encoding members of this family are SIR2 (CAGL0K01463g), HST1 (CAGL0C05357g), HST2 (CAGL0L08668g), HST3 (CAGL0H08239g) and HST4 (CAGL0F05621g). SIR4 (CAGL0K11396g) encodes a factor that forms a functional complex with Sir2. In this experiment, the transcription profile of C. glabrata HST1 null, HST2 null, SIR2 null or SIR4 null strain individually comparing with that of wild type strain was determined. All strains were grown in YPD liquid medium in Log phase at 30 C. Keywords: transcriptional profiling by microarray
2007-01-04 | GSE6626 | GEO
Project description:To investigate the role of Sir2 controlling gene expression during U. maydis pathogenesis, sir2 was deleted and overexpressed with Ppit2 promoter. RNA-Seq analysis were performed during axenic growth or filament formation in PD-Charcoal plates comparing Δsir2 mutan and wild type strains. Additionally RNA-Seq analysis were performed at 3 days post infection comparing Ppit2:sir2 >1c overexpression mutant and wild type strains.
2023-03-10 | GSE226596 | GEO
Project description:O-acetyl-ADP-ribose (AAR) is a small metabolic molecule that is generated during NAD-dependent deacetylation by Sir2. Sir2 regulates gene expression, DNA repair, and genome stability. chromatin affinity-precipitation (ChAP) method was used to detect the chromatin fragments at which small molecules interact with binding partners. Chromatin immunoprecipitation of Sir3 and of Sir2, respectively, applied with tilling array chip (ChIP on chip of Sir3 and of Sir2, respectively) and Chromatin affinity-precipitation of AAR applied with tilling array chip (ChAP on chip of AAR ) analysis demonstrated that an extended spreading of Sir3 and of AAR, but not Sir2 in Saccharomyces cerevisiae Ysa1 deleted cells compared with those in wild type cells Comparison the distributions of Sir3, of Sir2 and of AAR on silent heterochromatin of Ysa1 deletion cells vs those of wild type cells
2015-12-31 | E-GEOD-65672 | biostudies-arrayexpress
Project description:This experiment studies the effect of knocking out the transcriptional regulator SIR2 in 3D7 parasites. RNA was harvested from ring-stage parasites at 8 hours post-infection. Keywords = SIR2 Keywords = epigenetic regulation Keywords = antigenic variation Keywords = var Keywords = Plasmodium falciparum Keywords: other
2005-03-08 | GSE2369 | GEO
Project description:O-acetyl-ADP-ribose (AAR) is a small metabolic molecule that is generated during NAD-dependent deacetylation by Sir2. Sir2 regulates gene expression, DNA repair, and genome stability. chromatin affinity-precipitation (ChAP) method was used to detect the chromatin fragments at which small molecules interact with binding partners. Chromatin immunoprecipitation of Sir3 and of Sir2, respectively, applied with tilling array chip (ChIP on chip of Sir3 and of Sir2, respectively) and Chromatin affinity-precipitation of AAR applied with tilling array chip (ChAP on chip of AAR ) analysis demonstrated that an extended spreading of Sir3 and of AAR, but not Sir2 in Saccharomyces cerevisiae Ysa1 deleted cells compared with those in wild type cells
2015-12-31 | GSE65672 | GEO
Project description:Sir2 is the most intensively discussed longevity gene in current aging research. Although the gene encoding for a NAD+-dependent histone deacetylase initially was found to extend lifespan of various organisms ranging from yeast to mammals, serious doubts regarding its role in longevity have been expressed recently. In this study, we tested whether tissue-specific overexpression of Sir2 in the adult fat body can extend lifespan when compared to genetically identical controls. We also wanted to elucidate the mechanisms by which fat body Sir2 promotes longevity by studying the phenotypic and transcriptional changes in the fat body. We found that moderate (3-fold) Sir2 overexpression in the fat body during adulthood only can promote longevity in both sexes by roughly 13 %. In addition, we obtained transcriptional profiles elicited by this overexpression and propose a role for Sir2 in lipid droplet biology especially under conditions of starvation. Furthermore, our data do not support the idea of Sir2 mediating the response to dietary restriction (DR) because transcriptional profiles of fat bodies after DR or Sir2 overexpression do not match. This study provides additional independent evidence for the concept of Sir2 as a longevity gene and as a promising pharmacological target to cure age-related diseases. 6 groups of sample types were included in the experiment: a) females overexpressing Sir2 in the fat body b) female controls c) males overexpressing Sir2 in the fat body d) male controls e) wildtype females subjected to DR f) wildtype females feeding on a normal diet. 3 biological replicates were included per group.
2013-05-01 | E-GEOD-45974 | biostudies-arrayexpress
Project description:Sir2 is the most intensively discussed longevity gene in current aging research. Although the gene encoding for a NAD+-dependent histone deacetylase initially was found to extend lifespan of various organisms ranging from yeast to mammals, serious doubts regarding its role in longevity have been expressed recently. In this study, we tested whether tissue-specific overexpression of Sir2 in the adult fat body can extend lifespan when compared to genetically identical controls. We also wanted to elucidate the mechanisms by which fat body Sir2 promotes longevity by studying the phenotypic and transcriptional changes in the fat body. We found that moderate (3-fold) Sir2 overexpression in the fat body during adulthood only can promote longevity in both sexes by roughly 13 %. In addition, we obtained transcriptional profiles elicited by this overexpression and propose a role for Sir2 in lipid droplet biology especially under conditions of starvation. Furthermore, our data do not support the idea of Sir2 mediating the response to dietary restriction (DR) because transcriptional profiles of fat bodies after DR or Sir2 overexpression do not match. This study provides additional independent evidence for the concept of Sir2 as a longevity gene and as a promising pharmacological target to cure age-related diseases.
2013-05-01 | GSE45974 | GEO
Project description:Although SIRT1 plays a central role in maintaining metabolic homeostasis, the molecular mechanisms remain unclear. Here we show that loss of the Drosophila SIRT1 homolog sir2 leads to the progressive onset of diabetic phenotypes, similar to studies of SIRT1 in mice. Sir2 function is both necessary and sufficient in the fat body to maintain peripheral insulin sensitivity. This activity is mediated by the Drosophila HNF4 nuclear receptor, which is deacetylated and stabilized through protein interactions with Sir2. This study demonstrates that the key metabolic activities of SIRT1 have been conserved through evolution and establishes HNF4 as a critical downstream target. 4 sir2 mutant, 4 control samples, independent biological replicates
2016-02-29 | E-GEOD-72947 | biostudies-arrayexpress
Project description:Although SIRT1 plays a central role in maintaining metabolic homeostasis, the molecular mechanisms remain unclear. Here we show that loss of the Drosophila SIRT1 homolog sir2 leads to the progressive onset of diabetic phenotypes, similar to studies of SIRT1 in mice. Sir2 function is both necessary and sufficient in the fat body to maintain peripheral insulin sensitivity. This activity is mediated by the Drosophila HNF4 nuclear receptor, which is deacetylated and stabilized through protein interactions with Sir2. This study demonstrates that the key metabolic activities of SIRT1 have been conserved through evolution and establishes HNF4 as a critical downstream target.
2016-02-29 | GSE72947 | GEO
Project description:All Rap1, Sir2, Sir3, Sir4, and mock immunoprecipitation experiments associated with Lieb et al. Nature Genetics, August 2001, Volume 28, Issue 4 Set of arrays organized by shared biological context, such as organism, tumors types, processes, etc. Computed
2005-09-24 | E-GEOD-3360 | biostudies-arrayexpress