Ustilago maydis
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PROVIDER: PRJNA126029 | ENA |
REPOSITORIES: ENA
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Project description:The rep1 gene of the maize pathogen Ustilago maydis encodes a pre-pro-protein that is processed in the secretory pathway into 11 peptides. These so-called repellents form amphipathic amyloid fibrils at the surface of aerial hyphae. Strains in which the rep1 gene is inactivated (∆rep1 strain) are affected in aerial hyphae formation. This makes these strains instrumental to assess changes in global gene expression as a consequence of aerial growth. Microarray analysis revealed that only 31 genes in the ∆rep1 SG200 strain had a fold change in expression of >= 2. Twenty-two of these genes are up-regulated and half of them encode small secreted proteins (SSP’s) with unknown functions. Seven of the SSP genes and two other genes that are over-expressed in the ∆rep1 SG200 strain encode secreted cysteine-rich proteins (SCRP’s). Interestingly, most of the SCRP’s are predicted to form amyloids. The SCRP gene um00792 showed the highest up-regulation in the ∆rep1 strain. Using GFP as a reporter, it was shown that this gene is over-expressed in the layer of hyphae at the medium-air interface. Taken together, it is concluded that only minor changes occur in the expression profile when U. maydis forms aerial structures. Key words: aerial hypha, repellent, hydrophobin-like protein, Ustilago maydis, SSP, SCRP, fungal pathogenicity.
2011-05-01 | GSE21490 | GEO
Project description:The rep1 gene of the maize pathogen Ustilago maydis encodes a pre-pro-protein that is processed in the secretory pathway into 11 peptides. These so-called repellents form amphipathic amyloid fibrils at the surface of aerial hyphae. Strains in which the rep1 gene is inactivated (M-bM-^HM-^Frep1 strain) are affected in aerial hyphae formation. This makes these strains instrumental to assess changes in global gene expression as a consequence of aerial growth. Microarray analysis revealed that only 31 genes in the M-bM-^HM-^Frep1 SG200 strain had a fold change in expression of >= 2. Twenty-two of these genes are up-regulated and half of them encode small secreted proteins (SSPM-bM-^@M-^Ys) with unknown functions. Seven of the SSP genes and two other genes that are over-expressed in the M-bM-^HM-^Frep1 SG200 strain encode secreted cysteine-rich proteins (SCRPM-bM-^@M-^Ys). Interestingly, most of the SCRPM-bM-^@M-^Ys are predicted to form amyloids. The SCRP gene um00792 showed the highest up-regulation in the M-bM-^HM-^Frep1 strain. Using GFP as a reporter, it was shown that this gene is over-expressed in the layer of hyphae at the medium-air interface. Taken together, it is concluded that only minor changes occur in the expression profile when U. maydis forms aerial structures. Key words: aerial hypha, repellent, hydrophobin-like protein, Ustilago maydis, SSP, SCRP, fungal pathogenicity. To analyze expression changes in aerial hyphae upon deletion of the rep1 gene, strains SG200 and SG200M-bM-^HM-^Frep1 were grown on charcoal nitrate minimal array media supplemented with vitamins and 1% glucose at 22 C for 48 h. For each experiment three biological replicates were performed.
2011-05-01 | E-GEOD-21490 | biostudies-arrayexpress
Project description:Ustilago maydis is a plant-pathogenic fungus that establishes a biotrophic relationship with its host Zea mays. The biotrophic interaction is initiated upon host penetration, and involves expansion of the host plasma membrane around hyphae, which is thought to facilitate the exchange of nutrients and virulence factors. Transcriptional regulators involved in the establishment of an infectious dikaryon and penetration into the host have been identified, however, regulators involved in the post-penetration stages remained to be elucidated. In the study we report the identification of an Ustilago maydis forkhead transcription factor, Fox1, which is exclusively expressed during biotrophic development. Deletion of fox1 results in reduced virulence and impaired tumour development in planta. Δfox1 hyphae induce plant defences including the overproduction and accumulation of H2O2 in and around infected cells. This oxidative burst acts as an intercellular signal, which elicits a specific host defence response phenotypically represented by the encasement of proliferating hyphae in extensions of the plant cell wall. Maize microarrays experiments were performed to identify genes involved in the observed plant defence responses on leaf tissue infected with U. maydis strain SG200∆fox1 4 dpi.
2010-12-31 | GSE19559 | GEO
Project description:Ustilago maydis is a plant-pathogenic fungus that establishes a biotrophic relationship with its host Zea mays. The biotrophic interaction is initiated upon host penetration, and involves expansion of the host plasma membrane around hyphae, which is thought to facilitate the exchange of nutrients and virulence factors. Transcriptional regulators involved in the establishment of an infectious dikaryon and penetration into the host have been identified, however, regulators involved in the post-penetration stages remained to be elucidated. In the study we report the identification of an Ustilago maydis forkhead transcription factor, Fox1, which is exclusively expressed during biotrophic development. Deletion of fox1 results in reduced virulence and impaired tumour development in planta. Microarray analyses of Δfox1-infected plant tissue identified Fox1 as a transcriptional activator, involved in the expression of secreted effectors required for virulence.
2010-12-31 | GSE19591 | GEO
Project description:Ustilago maydis is a basidiomycete fungus that causes smut disease in maize. Most prominent symptoms of the disease are plant tumors, which can be induced by U. maydis on all aerial parts of the plant. We identified two linked genes, pit1 and pit2, which are specifically expressed during plant colonization. Deletion mutants for either pit1 or pit2 are unable to induce tumor development and elicit plant defense responses. We used the Affymetrix maize genome array to analyze the transcriptional responses of maize to deletion pit1 and pit2 mutants and found plant responses to both mutants being not significantly distinguishable.
2011-07-01 | GSE28479 | GEO
Project description:The fungus Ustilago maydis is a biotrophic pathogen of corn. In its genome we have identified an ortholog of YAP1 from Saccharomyces cerevisae which regulates the oxidative stress response in this organism. yap1 mutants of U. maydis displayed higher sensitivity to H2O2 than wild type cells and their virulence was significantly reduced. U. maydis yap1 could partially complement the H2O2 sensitivity of a yap1 deletion mutant of S. cerevisiae and a Yap1-GFP fusion protein showed nuclear localization after H2O2 treatment, suggesting that Yap1 in U. maydis functions as a redox sensor. Mutations in two cysteine residues prevented accumulation in the nucleus and the respective mutant strains showed the same virulence phenotype as Dyap1 mutants. DAB staining revealed an accumulation of H2O2 around yap1 mutant hyphae which was absent in wild type. Inhibition of the plant NADPH oxidase prevented this accumulation and restored virulence. During the infection Yap1 showed nuclear localization after penetration up to 2-3 days after infection. Through array analysis a large set of yap1 regulated genes were identified and these included two peroxidase genes. Deletion mutants of these genes were attenuated in virulence. These results suggest that U. maydis is using its yap1 controlled H2O2 detoxification system for coping with early plant defense responses. Keywords: Oxidative stress, yap1 dependent genes, Ustilago maydis
2007-04-17 | GSE7518 | GEO
Project description:Gene expression on different carbon sources in response to hxt1 deletion in Ustilago maydis
| PRJNA117351 | ENA
Project description:Transcriptome analysis of a Ustilago maydis ust1 deletion mutant
| PRJNA237304 | ENA
Project description:The biotrophic fungal pathogen Ustilago maydis cause common smut in maize, and lead to gall formation on all aerial organs, especially on maize kernel thus reduce yield. The interaction of U. maydis with maize is a well-established model to study the interaction between maize and biotrophic pathogen. U. maydis infection could activate host immune responses including: ROS accumulation, protease activation, salicylic acid signaling. U. maydis employ several strategies to overcome maize immune response, thus initial the biotrophic interaction with host. It has been suggested that genetic factors of maize host affected the disease severity of U. maydis infection, here we investigated the transcriptome profile of resistance and susceptible maize lines upon U. maydis infection, thus propose candidate maize genes involved in the defense response in maize to corn smut cause by U. maydis.
2021-04-15 | GSE172071 | GEO
Project description:This SuperSeries is composed of the following subset Series: GSE18750: Controlled expression of compatible and incompatible combinations of Ustilago maydis b-mating type locus genes bE and bW GSE18754: Effect of rbf1 deletion during controlled expression of of Ustilago maydis b-mating type locus genes bE1 and bW2 GSE18756: Rbf1 induced gene expression in Ustilago maydis Refer to individual Series
2010-06-01 | E-GEOD-18881 | biostudies-arrayexpress