Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Comparative genomic hybridization of 5 strains of Paxillus filamentosus and 1 strain of Paxillus involutus

ABSTRACT: Variations in gene content and sequence that could be associated with symbiotic adaptations of the ectomycorrhizal fungus Paxillus involutus were investigated by analyses of strains showing various abilities to form mycorrhiza. Five strains of Paxillus involutus (ATCC 200175, Maj; Nau, Pi01SE, and Pi08BE) and one strain of Paxillus filamentosus (Pf01De) were analyzed by comparative genomic hybridizations using cDNA microarrays. Two batches of arrays were used containing 1,076 unique fungal reporters. DNA was prepared from each strain, and after fragmentation and labelling used for dual-label microarray hybridizations. The experimental design includes 16 arrays (CGH_01 -- CGH_16), of which 12 arrays represent dye-swapped and direct contrasts between the sample strains and the reference strain ATCC 200175. Two arrays represent dye-swapped self-self hybridizations of the reference strain ATCC 200175 (CGH_01 and CGH_02). The remaining two arrays represent dye-swapped and direct contrasts between the sample strains Maj and Nau (CGH_06 and CGH_07).

INSTRUMENT(S): Axon GenePix 4000A scanning hardware

ORGANISM(S): Paxillus filamentosus

SUBMITTER: Antoine Le Quéré

PROVIDER: E-MEXP-437 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Screening for rapidly evolving genes in the ectomycorrhizal fungus Paxillus involutus using cDNA microarrays.

Le Quéré Antoine A Eriksen Kasper Astrup KA Rajashekar Balaji B Schützendübel Andres A Canbäck Björn B Johansson Tomas T Tunlid Anders A

Molecular ecology 20060201 2

We have examined the variations in gene content and sequence divergence that could be associated with symbiotic adaptations in the ectomycorrhizal fungus Paxillus involutus and the closely related species Paxillus filamentosus. Strains with various abilities to form mycorrhizae were analysed by comparative genomic hybridizations using a cDNA microarray containing 1076 putative unique genes of P. involutus. To screen for genes diverging at an enhanced and presumably non-neutral rate, we implement ...[more]

PMID: 16448419

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Project description:Abstract: A large part of the nitrogen in forest soils is found in recalcitrant organic matter-protein complexes. Ectomycorrhizal fungi are thought to have a key role in the decomposition and mobilization of nitrogen from such complexes. The knowledge on the functional mechanisms of these processes, and how they are regulated by carbon from the host plant and the availability of more easily available forms of nitrogen sources are limited. We used spectroscopic analyses and transcriptome profiling to examine how the presence/absence of glucose and ammonium regulates the decomposition and mobilization of nitrogen from litter material by the ectomycorrhizal fungus Paxillus involutus. Amendments of glucose triggered the assimilation of nitrogen and the decomposition of the litter material. Concomitantly, the expression of genes encoding enzymes involved in oxidative (i.e. Fenton chemistry) degradation of polysaccharides and polyphenols, peptidases, nitrogen transporters and enzymes in pathways of the nitrogen and carbon metabolism were upregulated in concert. Addition of ammonium had minute effects on both the expression of transcripts and decomposition of litter material, and only when glucose was present. Based on the spectroscopic analyses, three major types of chemical modifications of the litter material were observed. Each of them was correlated with the expression of specific sets of genes encoding extracellular enzymes. Our data suggests that the expression of the decomposition and nitrogen assimilation machinery of ectomycorrhizal fungi can be firmly regulated by the host carbon supply, i.e. priming, and that the availability of inorganic nitrogen as such has limited effects on the saprotrophic activities. Rineau F, Shah F., Smits M.M., Persson P., Johansson T., Carleer R., Troein C., Tunlid A. (2013) Carbon availability triggers the decomposition of plant litter and assimilation of nitrogen by an ectomycorrhizal fungus (submitted) A one-chip study (data from 12 subarrays collected from a 12-plex Nimblegen microarray (ID 467991) using total RNA recovered from three separate glass-bead cultures of Paxillus involutus (ATCC200175) after amendments of various soil-derived substrates. Transcriptome profiling to examine how the presence/absence of glucose and ammonium regulates the decomposition and mobilization of nitrogen from litter material by the ectomycorrhizal fungus Paxillus involutus.

Dataset Information

Comparative genomic hybridization of 5 strains of Paxillus filamentosus and 1 strain of Paxillus involutus

Publications

Screening for rapidly evolving genes in the ectomycorrhizal fungus Paxillus involutus using cDNA microarrays.

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