Large Copper
Ontology highlight
ABSTRACT:
PROVIDER: PRJEB75817 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:To identify genes which are differentially expressed in Corynebacterium glutamicum in the absence of copper, we performed DNA microarray analyses of cells cultivated under copper starvation conditions compared to copper sufficiency.
2018-08-28 | GSE117530 | GEO
Project description:Copper-limiting growth conditions were thought to cause an induction of genes possibly involved in copper uptake and sorting. This rationale in mind, we performed microarray analyses on B. japonicum cells grown in three variations of the BVM minimal medium. Variant 1 contained 2 μM CuSO4 (copper excess). Variant 2 was prepared in HCl-treated glassware without any copper added (copper starvation). The residual copper concentration in this copper-starvation medium was analyzed by GF-AAS and determined to be 5 nM. Variant 3 (extreme copper limitation) was prepared like variant 2 but with the addition of 10 μM BCS and 1 mM ascorbic acid where BCS chelates Cu(I) selectively, and ascorbic acid reduces any Cu(II) to Cu(I). Changes in the transcription profiles were recorded by the pairwise comparison of cells grown in variant 2 vs. 1, and variant 3 vs. 2. Only a small set of genes were differentially up- or down-regulated when copper-starved cells were compared with cells grown in copper excess. Most notably, five genes located adjacent to each other on the B. japonicum genome displayed an increased expression: bll4882 to bll4878. The five genes were named pcuA, pcuB, pcuC, pcuD, and pcuE (mnemonic of proteins for Cu trafficking). The genes with decreased expression are either of unknown function or – not surprisingly – play a role in copper resistance. Extreme copper limitation (variant 3 vs. 2) did not further enhance the expression of the five pcu genes. Instead, another cluster of adjacent genes was strongly up-regulated: bll0889 to bll0883, which code for unidentified transport functions. Incidentally, the list also includes the copper chaperone ScoI. Taken together, copper-limiting growth conditions have led to the de-repression of genes potentially involved in copper acquisition.
2012-10-01 | GSE40437 | GEO
Project description:Copper and iron are essential micronutrients for most living organisms because they participate as cofactors in biological processes including respiration, photosynthesis and oxidative stress protection. In many eukaryotic organisms, including yeast and mammals, copper and iron homeostases are highly interconnected; however such interdependence is not well established in higher plants. Here we propose that COPT2, a high-affinity copper transport protein, functions under copper and iron deficiencies in Arabidopsis thaliana. COPT2 is a plasma membrane protein that functions in copper acquisition and distribution. Characterization of the COPT2 expression pattern indicates a synergic response to copper and iron limitation in roots. We have characterized a knockout of COPT2, copt2-1, that leads to increased resistance to simultaneous copper and iron deficiencies, measured as reduced leaf chlorosis and improved maintenance of the photosynthetic apparatus. We propose that COPT2 expression could play a dual role under Fe deficiency. First, COPT2 participates in the attenuation of copper deficiency responses driven by iron limitation maybe aimed to minimize further iron consume. On the other hand, global expression analyses of copt2-1 mutants versus wild type Arabidopsis plants indicate that low phosphate responses are increased in copt2-1 plants. In this sense, COPT2 function under Fe deficiency counteracts low phosphate responses. These results open up new biotechnological approaches to fight iron deficiency in crops.
2013-06-05 | GSE42642 | GEO
Project description:Copper-limiting growth conditions were thought to cause an induction of genes possibly involved in copper uptake and sorting. This rationale in mind, we performed microarray analyses on B. japonicum cells grown in three variations of the BVM minimal medium. Variant 1 contained 2 M-NM-<M CuSO4 (copper excess). Variant 2 was prepared in HCl-treated glassware without any copper added (copper starvation). The residual copper concentration in this copper-starvation medium was analyzed by GF-AAS and determined to be 5 nM. Variant 3 (extreme copper limitation) was prepared like variant 2 but with the addition of 10 M-NM-<M BCS and 1 mM ascorbic acid where BCS chelates Cu(I) selectively, and ascorbic acid reduces any Cu(II) to Cu(I). Changes in the transcription profiles were recorded by the pairwise comparison of cells grown in variant 2 vs. 1, and variant 3 vs. 2. Only a small set of genes were differentially up- or down-regulated when copper-starved cells were compared with cells grown in copper excess. Most notably, five genes located adjacent to each other on the B. japonicum genome displayed an increased expression: bll4882 to bll4878. The five genes were named pcuA, pcuB, pcuC, pcuD, and pcuE (mnemonic of proteins for Cu trafficking). The genes with decreased expression are either of unknown function or M-bM-^@M-^S not surprisingly M-bM-^@M-^S play a role in copper resistance. Extreme copper limitation (variant 3 vs. 2) did not further enhance the expression of the five pcu genes. Instead, another cluster of adjacent genes was strongly up-regulated: bll0889 to bll0883, which code for unidentified transport functions. Incidentally, the list also includes the copper chaperone ScoI. Taken together, copper-limiting growth conditions have led to the de-repression of genes potentially involved in copper acquisition. Microarray-based transcriptome analysis of B. japonicum 110spc4 wild-type cells grown under normal, copper-limiting and copper excess conditions
2012-10-01 | E-GEOD-40437 | biostudies-arrayexpress
Project description:Analysis of genome-wide gene expression patterns in response to copper in WT and COPR mutant in the cyanobacterium Synechocystis sp PCC 6803. Here we have used microarrays to interrogate the global responses to copper additions at non-toxic (0.3 micromolar) and toxic concentrations (3 micromolar) of copper in WT and in a mutant in the copR gene. Addition of the non-toxic copper concentration stimulated the metabolism and induced the switch in the use from cyitochrome c6 to plastocyanin. In contrast, high copper addition induced a stress response and affected the metabolism of several other metals. This included repression of ribosomal, photosynthetic and metabolic genes and induction of chaperones and antioxidant enzymes genes. Finally CopRS seems to control only the expression of the copMRS and copBAC operons as all other genes that were differentially expressed by copper seemed to be unaffected in copR strains.
2014-09-01 | GSE51671 | GEO
Project description:Iron and copper are important environmental nutrients for plant growth. However, the molecular mechanisms of both iron and copper signaling that integrate the two pathways remain poorly understood. The Arabidopsis thaliana high affinity copper transporter COPT5, is a tonoplast localized permease involved in copper remobilization. Here, a global expression microarray analysis of the copt5 mutant points out the induction of iron deficiency responses, including NATURAL RESISTANCE-ASSOCIATED MACROPHAGE PROTEIN 4 (NRAMP4), a tonoplast-localized iron transporter. The copper requirement in iron perception and uptake from the media becomes more evident in the double nramp3nramp4 mutant, unable to remobilize iron from vacuoles, that is highly sensitive to copper deficiency. Furthermore, COPT5 expression is altered under iron deficiency and the copt5 mutant is sensitive to iron deficiency and is unable to perceive iron in the media under copper deficiency. Noteworthy, iron deficiency post-transcriptionally restraints the copper-dependent superoxide dismutase protein levels and the subsequent activity. As a consequence of its increased iron deficiency responses, the copt5 mutant present lower levels of both copper- and iron-dependent superoxide dismutase activities. Moreover, the copt5 mutant mobilizes faster its iron storage pools and presents higher levels of iron in cotyledons and seeds. These results underline the importance of internal metal pools in the understanding of copper and iron deficiency responses and their crosstalk that are critical for governing proper plant development in response to combined metal scarcities in soils.
2017-05-30 | GSE91044 | GEO
Project description:Copper mesocosms Targeted loci environmental
| PRJNA449234 | ENA
Project description:Resistance to oxidative stress plays a vital role in animal physiology, where it influences both life history traits and the ability to tolerate the effects of a myriad of environmental stressors. While stress resistance has previously been shown to share a role in shaping an organism's response to traits as varied as desiccation, thermal tolerance and xenobiotic resistance, heavy metal tolerance presents a particular challenge with regards to adaptation to stress. Heavy metals contamination can result in robust and persistent selection pressure: not only is acute exposure highly toxic, but metals can accumulate in the environment over long periods, prolonging this exposure. However, many heavy metals, such as copper and zinc, are also essential micronutrients, which may constrain adaption in high copper conditions. To determine the genetic basis of copper tolerance in European Drosophila melanogaster, we phenotyped 76 inbred lines sampled from nine locations across Western Europe on copper sulphate, demonstrating that that copper tolerance is a highly variable trait. A combination of long-read nanopore sequencing and high-throughput RNA-seq analysis carried out before and after copper exposure shows that while copper tolerance is a highly heterogenous trait, affected by changes in expression across multiple loci, the greatest changes in expression a seen in the digestive tract. In addition, a large proportion of genes found differentially expressed upon copper exposure have previously shown to be regulated by a number of transcription factors with known roles in a broad range of metabolic processes, indicating that while the initial response may be tissue restricted, long term affects of copper expose are more likely to be systemic.
2020-12-31 | GSE154608 | GEO
Project description:In this study, we report the identification of a five-locus copper-inducible regulon in Mycobacterium tuberculosis. The identification of a copper responsive regulon unique to pathogenic Mycobacteria suggests copper homeostasis must be maintained during an infection.
2010-10-27 | GSE23498 | GEO
Project description:In Saccharomyces cerevisiae, copper ions regulate gene expression through the two transcriptional activators, Ace1 and Mac1. Ace1 mediates Cu-induced gene expression in cells exposed to stressful levels of copper salts, whereas Mac1 activates a subset of genes under copper-deficient conditions. DNA microarray hybridization experiments revealed a limited set of yeast genes differentially expressed under growth conditions of excess copper or copper deficiency. Mac1 activates the expression of six S. cerevisiae genes, including CTR1, CTR3, FRE1, FRE7, YJL217w and YFR055w. Two of the last three newly identified Mac1 target genes have no known function, the third, YFR055w, is homologous to cystathionine gamma-lyase encoded by CYS3. Several genes that are differentially expressed in cells containing a constitutively active Mac1, designated Mac1up1, are not direct targets of Mac1. Induction or repression of these genes is likely a secondary effect of cells due to constitutive Mac1 activity. Elevated copper levels induced the expression of the metallothioneins CUP1 and CRS5, and two genes, FET3 and FTR1, in the iron uptake system. Cu-induced FET3 and FTR1 expression arises from an indirect Cu effect on cellular Fe pools. This study is described in more detail in Gross C et al.(2000) J Biol Chem 275:32310-6 Keywords: other
2002-02-12 | GSE26 | GEO