Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Listening in on a bacterial/fungal dialog: transcriptional profiling of an antagonistic interaction

ABSTRACT: The genus Collimonas consists of soil bacteria that are well known for their antifungal activity and for mycophagy, i.e. the ability to grow at the expense of living fungi. The aim of the current study was to gain a better understanding of the mechanisms of antagonism of Collimonas bacteria towards fungi, the involvement of the mycophagous phenotype, and the role of the fungus as a responsive partner in the interaction. In order to reach this aim, the bacterium Collimonas fungivorans and the fungus Aspergillus niger were confronted in vitro. Bacterial and fungal RNA were isolated at two time points during the interaction and analyzed by microarray analysis. Objective: Investigate the expression profile of a bacterium when it was challenged by the presence of an antagonist fungus (control was the expression profile of the bacterium when it was alone). In parallel investigate the expression profile of the antagonist fungus when it was challenged by the presence of the bacterium (control was the expression profile of the fungus when it was alone).(Additional file available in additional.zip)

ORGANISM(S): Collimonas fungivorans

SUBMITTER: Francesca Mela

PROVIDER: E-MTAB-350 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Dual transcriptional profiling of a bacterial/fungal confrontation: Collimonas fungivorans versus Aspergillus niger.

Mela Francesca F Fritsche Kathrin K de Boer Wietse W van Veen Johannes A JA de Graaff Leo H LH van den Berg Marlies M Leveau Johan H J JH

The ISME journal 20110526 9

Interactions between bacteria and fungi cover a wide range of incentives, mechanisms and outcomes. The genus Collimonas consists of soil bacteria that are known for their antifungal activity and ability to grow at the expense of living fungi. In non-contact confrontation assays with the fungus Aspergillus niger, Collimonas fungivorans showed accumulation of biomass concomitant with inhibition of hyphal spread. Through microarray analysis of bacterial and fungal mRNA from the confrontation arena, ...[more]

PMID: 21614084

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Project description:Filamentous fungi are confronted with changes and limitations of their carbon source during growth in their natural habitats and during industrial applications. To survive life-threatening starvation conditions, carbon from extra- and intracellular resources becomes mobilized to fuel fungal self-propagation. Key to understand the underlying cellular processes is the system-wide analysis of fungal starvation responses in a temporal and spatial resolution. The knowledge deduced is important for the development of optimized industrial production processes. This study describes the physiological, morphological and genome-wide transcriptional changes caused by prolonged carbon starvation during submerged batch cultivation of the filamentous fungus Aspergillus niger. Bioreactor cultivation supported highly reproducible growth conditions and monitoring of physiological parameters. Changes in hyphal growth and morphology were analyzed at distinct cultivation phases using automated image analysis. The Affymetrix GeneChip platform was used to establish genome-wide transcriptional profiles for three selected time points during prolonged carbon starvation. Compared to the exponential growth transcriptome, about 50% (7,292) of all genes displayed differential genes expression during at least one of the starvation time points. Enrichment analysis of Gene Ontology, Pfam domain and KEGG pathway annotations uncovered autophagy and asexual reproduction as major global transcriptional trends. Induced transcription of genes encoding hydrolytic enzymes was accompanied by increased secretion of hydrolases including chitinases, glucanases, proteases and phospholipases as identified by mass spectrometry. This study is the first system-wide analysis of the carbon starvation response in a filamentous fungus. Morphological, transcriptomic and secretomic analyses identified key events important for fungal survival and their chronology. The dataset obtained forms a comprehensive framework for further elucidation of the interrelation and interplay of the individual cellular events involved. for each post-exponential time point (Day1, Day3 and Day6 post-carbon depletion), biological duplicates were performed.

Project description:This work presents an exploration of submerged differentiation of the ubiquitous saprophyte and industrially important fungus, Aspergillus niger, in response to a limited availability of a sole carbon and energy source, maltose. In aspergilli and other mold fungi, asexual reproduction through formation of elaborate conidiogenic structures normally requires an aerial interface. This requirement is bypassed in submerged culture in response to severe nutrient limitation. Continuous cultures with cell retention (retentostat cultures) were applied to generate a fundamental physiological state, where the specific growth rate approaches zero, as the density of the cell population adapts to the supply of the limiting energy source. Temporal differentiation of mycelium structure and commitment to asexual reproduction were major phenomena, apparent on biochemical, morphological, physiological, and transcriptomic level. The severe substrate limitation had a rapid negative impact on cytoplasmic processes, and promoted endo- and exogenous nutrient mobilization, and hyphal compartmentalisation. The first conidiogenic structures appeared after one day with little additional differentiation until Day 4 to 6, where a transition to full commitment to reproductive growth took place. Submerged conidiation in A. niger involved transcriptional regulation of homologs of the regulatory pathway, centered around the Bristle gene (brlA), and structural genes previously described in other aspergilli. Comparison of transcriptomes, revealed a number of co-regulated gene clusters, which appear to encode secondary metabolite biosynthetic potential. We discuss the concept of maintenance energy in the context of differentiation, a possible physiological trigger for sporulation and the special physiological adaptations of the starved mycelium. We also present a simple and efficient method for in situ retention of filamentous organisms. The dataset consists of 9 Affymetrix arrays derived from defined growth conditions of lab-scale bioreactor cultures (5L). Total RNA was extracted from biomass harvested at three different growth phases: exponential growth phase, 2 and 8 days of retentostat cultivation. For each of the phases, the data is derived from three biological replicates.

Dataset Information

Listening in on a bacterial/fungal dialog: transcriptional profiling of an antagonistic interaction

Publications

Dual transcriptional profiling of a bacterial/fungal confrontation: Collimonas fungivorans versus Aspergillus niger.

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