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Genome-wide gene expression profiling of fertilization competent mycelium in opposite mating types in the heterothallic fungus Podospora anserina.

ABSTRACT: Abstract BACKGROUND: Mating-type loci in yeasts and ascomycotan filamentous fungi (Pezizomycotina) encode master transcriptional factors that play a critical role in sexual development. Genome-wide analyses of mating-type-specification circuits and mating-type target genes are available in Saccharomyces cerevisiae and Schizosaccharomyces pombe; however, no such analyses have been performed in heterothallic (self-incompatible) Pezizomycotina. The heterothallic fungus Podospora anserina serves as a model for understanding the basic features of mating-type control. Its mat+ and mat- mating types are determined by dissimilar allelic sequences. The mat- sequence contains three genes, designated FMR1, SMR1 and SMR2, while the mat+ sequence contains one gene, FPR1. FMR1 and FPR1 are the major regulators of fertilization, and this study presents a genome-wide view of their target genes and analyzes their target gene regulation. METHODOLOGY/PRINCIPAL FINDINGS: The transcriptomic profiles of the mat+ and mat- strains revealed 157 differentially transcribed genes, and transcriptomic analysis of fmr1(-) and fpr1(-) mutant strains was used to determine the regulatory actions exerted by FMR1 and FPR1 on these differentially transcribed genes. All possible combinations of transcription repression and/or activation by FMR1 and/or FPR1 were observed. Furthermore, 10 additional mating-type target genes were identified that were up- or down-regulated to the same level in mat+ and mat- strains. Of the 167 genes identified, 32 genes were selected for deletion, which resulted in the identification of two genes essential for the sexual cycle. Interspecies comparisons of mating-type target genes revealed significant numbers of orthologous pairs, although transcriptional profiles were not conserved between species. CONCLUSIONS/SIGNIFICANCE: This study represents the first comprehensive genome-wide analysis of mating-type direct and indirect target genes in a heterothallic filamentous fungus. Mating-type transcription factors have many more target genes than are found in yeasts and exert a much greater diversity of regulatory actions on target genes, most of which are not directly related to mating.

ORGANISM(S): Podospora anserina

PROVIDER: GSE27297 | GEO | 2011/12/22

SECONDARY ACCESSION(S): PRJNA137351

REPOSITORIES: GEO

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Project description:Abstract BACKGROUND: Mating-type loci in yeasts and ascomycotan filamentous fungi (Pezizomycotina) encode master transcriptional factors that play a critical role in sexual development. Genome-wide analyses of mating-type-specification circuits and mating-type target genes are available in Saccharomyces cerevisiae and Schizosaccharomyces pombe; however, no such analyses have been performed in heterothallic (self-incompatible) Pezizomycotina. The heterothallic fungus Podospora anserina serves as a model for understanding the basic features of mating-type control. Its mat+ and mat- mating types are determined by dissimilar allelic sequences. The mat- sequence contains three genes, designated FMR1, SMR1 and SMR2, while the mat+ sequence contains one gene, FPR1. FMR1 and FPR1 are the major regulators of fertilization, and this study presents a genome-wide view of their target genes and analyzes their target gene regulation. METHODOLOGY/PRINCIPAL FINDINGS: The transcriptomic profiles of the mat+ and mat- strains revealed 157 differentially transcribed genes, and transcriptomic analysis of fmr1(-) and fpr1(-) mutant strains was used to determine the regulatory actions exerted by FMR1 and FPR1 on these differentially transcribed genes. All possible combinations of transcription repression and/or activation by FMR1 and/or FPR1 were observed. Furthermore, 10 additional mating-type target genes were identified that were up- or down-regulated to the same level in mat+ and mat- strains. Of the 167 genes identified, 32 genes were selected for deletion, which resulted in the identification of two genes essential for the sexual cycle. Interspecies comparisons of mating-type target genes revealed significant numbers of orthologous pairs, although transcriptional profiles were not conserved between species. CONCLUSIONS/SIGNIFICANCE: This study represents the first comprehensive genome-wide analysis of mating-type direct and indirect target genes in a heterothallic filamentous fungus. Mating-type transcription factors have many more target genes than are found in yeasts and exert a much greater diversity of regulatory actions on target genes, most of which are not directly related to mating. With GPL10116 : 4 conditions each with four biological replicates :mat+, mat-, fpr1-, fmr1-; common reference is a pool of four conditions M48h, M96h, C48h and C96h ; Conditions are labelled in Cy3 and the common reference in Cy5

Project description:The potential for sexual reproduction in Aspergillus oryzae was assessed by investigating the presence and functionality of MAT genes. Previous genome studies had identified a MAT1-1 gene in the RIB40 reference strain. We now report the existence of a complimentary MAT1-2 gene and sequencing of an idiomorph region from A. oryzae strain AO6. This allowed the development of a PCR diagnostic assay, which detected isolates of MAT1-1 and MAT1-2 genotype among 180 strains assayed including industrial tane-koji isolates. Strains used for sake and miso production showed a near 1:1 ratio of MAT1-1 and MAT1-2 mating-types, whereas strains used for soy sauce production showed a significant bias towards the MAT1-2 mating type. MAT1-1 and MAT1-2 isogenic strains were then created by genetic manipulation of the resident idiomorph, and comparisons were made of gene expression by DNA microarray and RT-PCR methodologies under conditions when MAT genes were expressed. 33 genes were found to be up-regulated greater than 10-fold in either the MAT1-1 host or MAT1-2 gene replacement strains relative to each other, showing that both MAT1-1 and MAT1-2 genes functionally regulate gene expression in A. oryzae in a mating-type dependent manner, the first such report from a supposedly asexual fungus. MAT1-1 expression specifically up-regulated an a-pheromone precursor gene, but most genes affected were of unknown function. Results are consistent with a heterothallic breeding system in A. oryzae, and prospects for the discovery of a sexual cycle are discussed. On a condition that induces mating-type genes descrived in growth protocol section, each cogenic MAT1-1 and MAT1-2 mating-type strains were processed into RNA extraction and hybridization on Affymetrix microarrays. In a speculation that genes involved in putative mating process were reguated in mating-type dependent manner, we designed the cogenic strains that differs only in mating-type gene locus to analyze differential gene expression of MAT1-1 vs MAT1-2 strains.

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Genome-wide gene expression profiling of fertilization competent mycelium in opposite mating types in the heterothallic fungus Podospora anserina.

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