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The black truffle of Perigord responds to a temperature shift with an extensive reprogramming of its transcriptional activity

ABSTRACT: Taking advantage of the availability of the Tuber melanosporum genome sequence and a whole-genome microarray, we wanted to test the hypothesis that the transition from a growth temperature of 24-25°C to a cold one (4°C) is perceived by the filamentous fungus at the transcriptomic level and we wanted to identify and characterize the genes involved in this stress response.

ORGANISM(S): Tuber melanosporum

PROVIDER: GSE21626 | GEO | 2010/09/15

SECONDARY ACCESSION(S): PRJNA127119

REPOSITORIES: GEO

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The black truffle of Perigord responds to a temperature shift with an extensive reprogramming of its transcriptional activity

Project description:Taking advantage of the availability of the Tuber melanosporum genome sequence and a whole-genome microarray, we wanted to test the hypothesis that the transition from a growth temperature of 24-25°C to a cold one (4°C) is perceived by the filamentous fungus at the transcriptomic level and we wanted to identify and characterize the genes involved in this stress response. The T. melanosporum custom-exon expression array (4 x 72K) manufactured by Roche NimbleGen Systems Limited (Madison, WI) contained five independent, nonidentical, 60-mer probes per gene model coding sequence. Included in the oligoarray were 12,232 annotated gene models, 3,913 random 60-mer control probes and labelling controls. Sequences used for the oligonucleotide design were from an early draft of the gene catalog containing several TE families. For 1,876 gene models, technical duplicates were included on the array. We performed 6 hybridizations (3 control and 3 treated) with samples derived from liquid cultures of T. melanosporum Mel28. After a month, some flasks were moved to 4°C for 1 week. After this period, the mycelium was collected from the treated (from 25°C to 4°C) and the untreated (25°C) control cultures. All samples were labeled with Cy3.

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Project description:The aim of this analysis was to better understand the complex symbiotic stage of Tuber melanosporum by combining the use of laser capture microdissection and microarray gene expression analysis. We isolated the fungal/soil (i.e. the mantle) and the fungal/plant (i.e. the Hartig net) interfaces from transverse sections of T. melanosporum/Corylus avellana ectomycorrhizas and identified the transcriptional landscape associated with each compartment. We compared these data to the transcriptome of ectomycorrhizal root tips, free-living mycelium and fruiting bodies of Tuber melanosporum (Series GSE17529). The T. melanosporum custom-exon expression array (4 x 72K) manufactured by Roche NimbleGen Systems Limited (Madison, WI) contained five independent, nonidentical, 60-mer probes per gene model coding sequence. Included in the oligoarray were 12,232 annotated gene models, 3,913 random 60-mer control probes and labelling controls. Sequences used for the oligonucleotide design were from an early draft of the gene catalog containing several TE families. For 1,876 gene models, technical duplicates were included on the array. We performed 6 hybridizations (NimbleGen) with samples derived from microdissected mantles (3 biological replicates) and Hartig nets ((3 biological replicates each) from T. melanosporum/Corylus avellana ectomycorrhizal root tips . All samples were labeled with Cy3.

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