Dataset Information

Developmental transcriptomics of the model caterpillar fungus Cordyceps militaris

ABSTRACT: The RNA-Seq technique was used to investigate the differentially transcribed genes of the caterpillar fungus Cordyces militaris. It was calculated that >63% of total annotated genes were expressed, including >55% of putative pathogen-host interaction genes. Overall, the fruiting-body development and mycelium growth by C. militaris activated high expression levels of genes in association with translation and post-translational modifications. Otherwise, there were many differentially expressed genes when the fungus was grown on insect pupae to different stages or in liquid medium. In general, the transcriptional profiles were more similar with each other during fungal fruiting-body developmental stages than during growth in a liquid culture.

ORGANISM(S): Cordyceps militaris

PROVIDER: GSE28001 | GEO | 2011/11/08

SECONDARY ACCESSION(S): PRJNA137789

REPOSITORIES: GEO

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Project description:The M-bM-^@M-^Xdevelopmental hourglassM-bM-^@M-^Y concept suggests that intermediate developmental stages are most resistant to evolutionary changes and that differences between species arise through divergence later in development. This high conservation during mid-development is illustrated by the M-bM-^@M-^XwaistM-bM-^@M-^Y of the hourglass and it represents a low probability of evolutionary change. Earlier molecular surveys both on animals and plants have shown that the genes expressed at the waist stage are more ancient and more conserved in their expression. The existence of such a developmental hourglass has not been explored in fungi, another eukaryotic kingdom. In this study, we generated a series of transcriptomic data covering the entire lifecycle of a model mushroom-forming fungus, Coprinopsis cinerea, and we observed a molecular hourglass over its development. The M-bM-^@M-^Xyoung fruiting bodyM-bM-^@M-^Y (YFB) is the stage that expresses the evolutionarily oldest (lowest transcriptome age index, TAI) transcriptome and gives the strongest signal of purifying selection (lowest transcriptome divergence index, TDI). We also demonstrated that all three kingdoms M-bM-^@M-^S animals, plants and fungi M-bM-^@M-^S display high expression levels of genes in M-bM-^@M-^Xinformation storage and processingM-bM-^@M-^Y at the waist stages, whereas the genes in M-bM-^@M-^XmetabolismM-bM-^@M-^Y become more highly expressed later. Besides, the three kingdoms all show underrepresented M-bM-^@M-^Xsignal transductionM-bM-^@M-^Y at the waist stages. The synchronic existence of a molecular M-bM-^@M-^XhourglassM-bM-^@M-^Y across the three kingdoms reveals a mutual strategy for eukaryotes to incorporate evolutionary innovations. NimbleGen custom microarray with total RNAs extracted from two biological replicates for each stage of mycelium, fruiting initials (~2mm tall), stage 2 primordium (~1cm tall), young fruiting body (~2cm tall) and the fully-expanded cap of the mature fruiting body (~4cm tall). Mycelia from 5 agar plates were collected and pooled to form one replicate. For the other stages, 4-5 independent structures were isolated and their RNA extracted as one replicate sample.

Dataset Information

Developmental transcriptomics of the model caterpillar fungus Cordyceps militaris

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