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Sordaria macrospora

ABSTRACT: Combining laser microdissection and RNA-seq to chart the transcriptional landscape of fungal development

PROVIDER: PRJNA148727 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR364302.fastq.gz	Fastqsanger.gz
	SRR364303.fastq.gz	Fastqsanger.gz
	SRR364304.fastq.gz	Fastqsanger.gz
	SRR364305.fastq.gz	Fastqsanger.gz
	SRR364306.fastq.gz	Fastqsanger.gz

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Gene expression in developmental mutants of Sordaria macrospora

Project description:The aim of this analysis was to analyze gene expression in developmental mutants of the filamentous ascomycete Sordaria macrospora. RNA was isolated from total mycelia, or young fruiting bodies (protoperithecia) were isolated by laser microdissection and RNA was extracted, amplified and used for RNA-sequencing.

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Project description:The Sordaria macrospora nox1 mutant has a block in sexual development at the stage of protoperithecia formation, and therefore is sterile. The aim of this study was to determine the transcriptome of microdissected protoperithecia from the mutant, as well as the transcriptomes of total RNA from the mutant and the wild type for comparison. The data were then compared with transcriptome data from protoperithecia of the wild type and the developemental mutant pro1; the corresponding data were generated in a previous study (Teichert et al. 2012, BMC Genomics 13: 511, GEO accession GSE33668). The samples (amplified RNA from nox1 microdissected protoperithecia and total RNA from nox1 and wild type mycelia undergoing sexual development) were sequenced as paired-end reads on an Illumina HiSeq 2000, two independent biological replicates for each nox1 sample and one replicate for the wild type.

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Project description:The study of mutants to elucidate gene functions has a long and successful history; however, to discover causative mutations in mutants that were generated by random mutagenesis often takes years of laboratory work and requires previously generated genetic and/or physical markers, or resources like DNA libraries for complementation. Here, we present an alternative method to identify defective genes in developmental mutants of the filamentous fungus Sordaria macrospora through Illumina/Solexa whole-genome sequencing. We sequenced pooled DNA from progeny of crosses of three mutants and the wild type and were able to pinpoint the causative mutations in the mutant strains through bioinformatics analysis. One mutant is a spore color mutant, and the mutated gene encodes a melanin biosynthesis enzyme. The causative mutation is a G to A change in the first base of an intron, leading to a splice defect. The second mutant carries an allelic mutation in the pro41 gene encoding a protein essential for sexual development. In the mutant, we detected a complex pattern of deletion/rearrangements at the pro41 locus. In the third mutant, a point mutation in the stop codon of a transcription factor-encoding gene leads to the production of immature fruiting bodies. For all mutants, transformation with a wild type-copy of the affected gene restored the wild-type phenotype. Our data demonstrate that whole-genome sequencing of mutant strains is a rapid method to identify developmental genes in an organism that can be genetically crossed and where a reference genome sequence is available, even without prior mapping information.

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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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