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Comparison of transcript abundance in ungerminated spores of the Magnaporthe oryzae TRA1-deleted mutant and its parental strain

ABSTRACT: In order to understand the function of the Tra1p transcription factor we identified potentially Tra1p-regulated genes by comparison of transcript abundance in conidia of the tra1- mutant and the parental strain 70-15. Two-condition experiment, wild-type vs. mutant. 3 biological replicates

ORGANISM(S): Magnaporthe oryzae

SUBMITTER: Karsten Andresen

PROVIDER: E-GEOD-36225 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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The role of the Tra1p transcription factor of Magnaporthe oryzae in spore adhesion and pathogenic development

Project description:This SuperSeries is composed of the following subset Series: GSE36224: Comparison of transcript abundance in aerial mycelium of the Magnaporthe oryzae TRA1-deleted mutant and its parental strain GSE36225: Comparison of transcript abundance in ungerminated spores of the Magnaporthe oryzae TRA1-deleted mutant and its parental strain Refer to individual Series

2012-03-03 | E-GEOD-36226 | biostudies-arrayexpress

Comparison of transcript abundance in aerial mycelium of the Magnaporthe oryzae TRA1-deleted mutant and its parental strain

Project description:In order to understand the function of the Tra1p transcription factor we identified potentially Tra1p-regulated genes by comparison of transcript abundance in aerial mycelium of the tra1- mutant and the parental strain 70-15. Two-condition experiment, wild-type vs. TRA1-deleted mutant. 4 biological replicates with dye-swaps. Each microarry slide had 2 arrays with 44k spots (22k spots printed twice). Thus, rep1 and rep2 are technical replicates of the same biological sample (derived from one raw data file).

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Gene expression profile of Tra1 dependent genes

Project description:Promoter-specific transcriptional activators (activators) stimulate transcription through direct interactions with one or more components of the transcription machinery, termed the “target”. Previous studies have provided evidence that the Tra1 subunit of the yeast SAGA (Spt-Ada-Gcn5-acetyltransferase) complex is the target of the yeast activator Gal4. However, several other general transcription factors, in particular the mediator complex, have also been implicated as Gal4 targets. To investigate the essentiality of Tra1 as a target of Gal4, here we derive Tra1 mutants that are selectively defective for interaction with Gal4 in vivo (Gal4 Interaction Defective (GID) mutants). In contrast to wild-type Tra1, Tra1 GID mutants are not recruited by Gal4 to the promoter and cannot support Gal4-directed transcription activation, demonstrating that the Gal4–Tra1 interaction is required for Gal4 function. In yeast strains expressing a Tra1 GID mutant, Gal4 promoter binding is unexpectedly also diminished indicating that Gal4 and Tra1 bind cooperatively. Consistent with cooperative binding, we demonstrate that the interaction between Gal4 and Tra1 occurs predominantly on the promoter and not off DNA. Finally, we show that although Tra1 is also targeted by other activators, these interaction are unaffected by GID mutations, revealing an unanticipated specificity of the Gal4-Tra1 interaction.

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Gene profiling of TRA1 and tra1-L3733A

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