RNA-seq analysis of kinase deletion mutant (ΔmpkA) and parental strain Aspergillus nidulans reveal novel cellular functions of MpkA.
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ABSTRACT:
ORGANISM(S): Aspergillus nidulans
PROVIDER: GSE108325 | GEO | 2019/05/01
REPOSITORIES: GEO
Similar Datasets
Project description:A transcriptomic assessment of a kinase deletion mutant (ΔpkaA) and a control strain revealed many cellular activities this kinase is impacting. Studies were conducted in the model filamentous fungi, Aspergillus nidulans¸ under rich growth conditions. PkaA is a known kinase that mediates a wide range of processes including: nutrient sensing, stress responses, regulation of metabolism, as well as development and pathogenicity. Here, fungi were grown in rich media containing glucose. The comparison between the control strain and the deletion mutant transcript levels revealed previously unknown targets, such as the transcription factor CreA, the main repressor responsible for carbon catabolite repression (CCR).
2018-07-04 | GSE116579 | GEO
Project description:Experimental evolution was conducted using Drosophila melanogaster populations that developed as larvae on breeding substrate that was infested with Aspergillus nidulans wild type, A. nidulans toxin-impaired mutant strain delta-laeA, the mycotoxin sterigmatocystin, or on fungi and toxin free substrate. Overall population were reared under these conditions for 11 generations, where after each confrontation generation one relaxation generation (fungi and toxin free breeding substrate) was conducted. Nine generations after the last selection treatment, first instar larvae were confronted with 3 days old A. nidulans wild type colonies or control conditions. 24 hours after confrontation start larvae were collected. For each biological replicate 52 larvae were collected from 4 independent confrontation units, balanced design. Three populations per selection regime were conducted, resulting in: 2 conditions x 4 selection regimes x 3 biological replicates (equal to fly population) = 24 samples. Selection regimes: sCO= control; sWT= A. nidulans wild type; sLA= A. nidulans mutant strain; sST= Sterigmatocystin. confrontation condition: cCO= control; cWT= A. nidulans wild type.
2020-05-09 | E-MTAB-9011 | biostudies-arrayexpress
Project description:The genome of the osmophilic Aspergillus wentii, unlike that of the osmotolerant Aspergillus nidulans, contains only the gfdA but not the gfdB glycerol 3-phosphate dehydrogenase gene. Here, we studied transcriptomic changes of A. nidulans (reference strain and DgfdB gene deletion mutant) and A. wentii (reference strain and An-gfdB expressing mutant) elicited by high osmolarity. A. nidulans showed canonic hyperosmotic stress response characterized by upregulation of trehalose and glycerol metabolism genes (including gfdB) as well as genes of the high-osmolarity glycerol (HOG) map kinase pathway. Deletion of gfdB caused only negligible alterations in the transcriptome suggesting that the glycerol metabolism was flexible enough to compensate for the missing GfdB activity in this species. A. wentii responded differently to increased osmolarity than A. nidulans: E.g.; bulk upregulation of glycerol and trehalose metabolism genes as well as HOG pathway genes were not detected. Expression of An-gfdB in A. wentii did not abolish osmophilia, but it reduced growth and caused much bigger alterations in the transcriptome than the missing gfdB gene did in A. nidulans. Flexible glycerol metabolism and hence two differently regulated gfd genes may be more beneficial for osmotolerant (living under changing osmolarity) than for osmophilic (living under constantly high osmolarity) species.
2024-02-28 | GSE255841 | GEO
Project description:The cell wall is a structure involved in important stages of fungal growth and morphogenesis. Several studies in the literature have shown how perturbations at the cell wall-level trigger dramatic effects on growth (e.g. Horiuchi, 2009). Despite the importance of fungal cell walls and despite the great advances made in the field, there are still missing pieces in our understanding of cell wall dynamics in filamentous fungi. Some cell wall biosynthetic genes, for example, are still uncharacterized (for a detailed inventory of Aspergillus nidulans cell wall-related genes, see de Groot et al., 2009). The chief polysaccharides in the cell wall of the model organism A. nidulans are β-glucans (β-1,3-, β-(1,3;1,4)- and β-1,6-glucans), chitin and α-1,3-glucans. While much is known about the chitin and α-1,3-glucan biosynthetic genes in A. nidulans (Horiuchi et al., 1999; Fujiwara et al., 2000; Ichinomiya et al., 2002 and 2005; Takeshita et al., 2006; Yoshimi et al., 2013), no characterization is yet available for the celA gene (ANIA_08444) encoding a putative mixed-linkage glucan synthase (de Groot et al., 2009). Recently, a study on A. fumigatus has characterized Tft1, an enzyme shown to be responsible for the production of β-(1,3;1,4)-glucans in this organism (Samar et al., 2015). Deletion of Tft1 causes no obvious phenotype in A. fumigatus and a modest increase in virulence. To characterize the role of β-(1,3;1,4)-glucans in the growth and development of filamentous fungi, we here sought to provide transcriptomics data of an A. nidulans strain showing reduced expression of the gene encoding the putative mixed linkage glucan synthase celA.
2017-07-26 | GSE94110 | GEO
Project description:Glutathione (GSH) is an abundant and widely distributed antioxidant in fungi. Hence, understanding cellular GSH metabolism is of vital importance to deciphering redox regulation in these microorganisms. In this study, we generated dugB (AN1879), dugC (AN1092), and dugB dugC double deletion mutants which display disruption of the GSH degradation pathway in Aspergillus nidulans. Deletion of dugB, dugC or both resulted in a moderate increase in GSH content under growing conditions and substantially slowed down the depletion of GSH pools under carbon starvation. Inactivation of dug genes caused reduced accumulation of reactive oxygen species, decreased autolytic cell wall degradation and extracellular enzyme production, increased sterigmatocystin formation but decreased viability in starving cultures. Changes in the transcriptomes suggested that enzyme secretions were controlled at post transcriptional level. In contrast, secondary metabolite production was also regulated at the level of mRNA abundance. Based on these findings, we suggest that GSH connects starvation and redox regulation to each other: A. nidulans cells utilize GSH as stored carbon source during starvation. The reduction of GSH contents of cells alters the redox state activating regulatory pathways responsible for carbon starvation stress responses. Under glucose rich conditions, inactivation of dug genes reduced conidia production of surface cultures, disturbed sexual development and down-regulated the transcription of genes encoding MAP kinase pathway proteins (e.g. steC, sskB, pbsA, hogA, mkkA) or proteins involved in the regulation of conidiogenesis or sexual differentiation (e.g. flbA,C,E, nosA, rosA, nsdC,D). These finding indicates that the authority of redox regulation goes far beyond the protection against redox stress; it affects development, stress responses (other than redox stress) and secondary metabolism as well.
2021-03-02 | GSE151461 | GEO
Project description:Drosophila melanogaster larvae and filamentous fungi both utilise organic material. Here they compete for resources. Filamentous fungi can defend themselves and their substrate from predation respectively competition by the production and excretion of secondary metabolites, including substances with antibiotic and insecticidal properties. To analyse the traits that enables D. melanogaster larvae to reduce the harmful effects of fungal secondary metabolites and to develop on fungal infested substrate we confronted larvae with a toxin-producing wild type of Aspergillus nidulans, with a toxin-production-impaired mutant strain of A. nidulans, and with sterigmatocystin, a highly toxic metabolite of A. nidulans. Early first instar larvae were transferred to breeding substrate inhabited by fungal colonies respectively inoculated with the purified mycotoxin or controls. After 3, 6, 12, and 24 hours of confrontation larvae were collected and samples prepared for whole transcriptome shotgun sequencing.
2017-12-01 | E-MTAB-5344 | biostudies-arrayexpress
Project description:A phosphoproteomic evaluation of the cellular response to micafungin (cell wall perturbant) in the filamentous fungi, A. nidulans, reveals putative, currently unknown cell wall integrity signaling (CWIS) associated proteins. This study used thirteen timepoints were taken from 0 to 10 minutes after cell wall exposure with two biological and two technical replicates. All data was processed using label free quantification with MaxQuant software.
2020-07-16 | PXD015038 | Pride
Project description:Genome wide transcriptional changes induced by various types of oxidative stresses as well as salt stress were studied in a DatfA mutant and the appropriate control A. nidulans strains. Although a significant number of stereotypically regulated genes was identified (Core Oxidative Stress Response or COSR genes) when the global transcriptional effects of five different oxidative stress conditions were compared the number of co-regulated genes decreased to 13 when NaCl stress was included into the analyses. The appearance of only a few co-regulated genes and the great number of genes regulated merely by one certain type of stress do not support the existence of a S. cerevisiae-type Environmental Stress Response in A. nidulans. Deletion of atfA, a true functional ortholog of fission yeastâs âall-purposeâ stress response transcription factor, increased the oxidative stress sensitivity of A. nidulans and affected the transcription of several genes under both unstressed and stressed conditions. The number of genes under AtfA control was quite stress-type dependent; e.g. deletion of atfA altered the transcription of a wide spectrum of genes under menadione sodium bisulfite stress but had only a minor effect on the transcriptome profiles when A. nidulans cultures were exposed to H2O2, tBOOH, NaCl and, especially, to diamide stress. These observations suggest that the function of AtfA in the regulation of various stress responses is much smaller than we thought before or other transcription factors can take over a number of AtfAâs functions when the atfA gene is deleted. It is noteworthy that both oxidative and salt stress induced the transcription of some secondary metabolite gene clusters and the deletion of atfA enhanced the stress responsiveness of further clusters. Surprisingly, certain clusters were down-regulated by the stress conditions tested and the majority of them were not stress-responsive at all. Therefore, stress dependent regulation seems to be a frequent but far not a general feature of the regulation of secondary metabolism in A. nidulans. 14 samples, 7 with the control strain and 7 with an DatfA strain (each series contains samples from untreated as well as menadione, low concentration hidrogen-peroxide, high concentration hidrogen-peroxide, tert-butylhydroperoxide, diamide and NaCl treated cultures)
2015-12-31 | E-GEOD-63019 | biostudies-arrayexpress
Project description:The bZIP transcription factors (TFs) govern regulation of development, secondary metabolism and various stress responses in filamentous fungi. In this work, we carried out genome-wide expression studies employing Illumina RNAseq to understand the roles of the two bZIP transcription factors AtfA and AtfB in Aspergillus nidulans. Comparative analyses of transcriptomes of vegetatively grown cells (mycelia) and asexual spores (conidia) obtained from the surface cultures of control, DatfA, DatfB, DatfADatfB mutant strains with/without menadione sodium bisulfite (MSB) treatment were performed. Probable AtfA and AtfB dependent gene sets were determined by comparing transcriptomes of both single gene deletion mutants with the reference strain, and the double gene deletion mutant with the appropriate single gene deletion mutants. As AtfA is the primary bZip TF governing stress-response in A. nidulans, a significantly higher number was differentially expressed genes (DEGs) by DatfA than DatfB in both mycelial and conidial samples, and most of the AtfB dependent genes showed AtfA dependence, too. Moreover, a low number of genes showing AtfB dependence only can be a consequence of that DatfA leading to downregulation of atfB expression. The abundance of atfA and atfB mRNAs and, concurring with it the number of AtfA and AtfB affected genes were much higher in conidial than in mycelial samples. The number of AtfB- (but not of AtfA-) affected DEGs decreased markedly in the presence of MSB, which was accompanied with decreased mRNA levels of atfB in MSB treated mycelial (reference strain) and conidial (DatfA mutant) samples. The overlap between the AtfA dependent DEGs in the case of MSB treated and untreated mycelial samples was low demonstrating that distinct genes can be under AtfA control in different cell types. The AtfA-dependent DEGs were enriched with carbohydrate metabolism genes. Among them, AtfA-dependence of glycolytic genes in the case of the conidial samples was the most notable. Levels of transcripts of certain secondary metabolitic gene clusters, like the Emericellamide cluster also showed AtfA-dependent regulation. The AtfA affected DEGs under all experimental conditions include those encoding catalase and histidine-containing phosphotransfer proteins. The 23 DEGs that solely dependent on AtfB considering all transcriptomics data sets, included a putative a -glucosidase (agdB), a putative a-amylase, calA involved in early conidial germination and an alternative oxidase. In summary, there is a complex interaction between the two b-Zip TFs in which the main function of AtfB is supporting the regulatory role of the primary b-Zip TF AtfA in A. nidulans.
2023-02-15 | GSE220052 | GEO
Project description:Investigation of whole genome gene expression level changes in Aspergillus nidulans AN1599 (PbcR) overexpression mutant, compared to the FGSC A4 wild-type strain. Overexpression of the Zn(II)2Cys6 –type transcription factor, AN1599.4 (PbcR, pimaradiene biosynthetic cluster regulator), activates a secondary metabolite gene cluster in Aspergillus nidulans. Activation of the pathway in Aspergillus nidulans lead to a production of ent-pimara-8(14),15-diene.
2012-04-16 | GSE32954 | GEO