Developmental competence
Ontology highlight
ABSTRACT:
ORGANISM(S): Aspergillus nidulans
PROVIDER: GSE68352 | GEO | 2015/04/29
SECONDARY ACCESSION(S): PRJNA282496
REPOSITORIES: GEO
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Project description:Timecourse of gene expression in vegetative mycelium for wild-type and a precocious mutant Two strains, 5 time points, 22 arrays
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Project description:RNA-seq analysis of developmental stages from the filamenous ascomycete Sordaria macrospora. Using laser capture microdissection, we separated protoperithecia (young fruiting bodies) from the surrounding hyphae. RNA isolation and amplification from 150 protoperithecia yields enough material for RNA-seq analysis. The resulting data were compared to RNA-seq data from whole mycelial exctracts (total vegetative and total sexual mycelium) to characterize the genome-wide spatial distribution of gene expression during sexual development. We analyzed total vegetative mycelium, total sexual mycelium, and protoperithecia from the wild type as well as protoperithecia from the sterile mutant pro1. Additionally, we used the RNA-seq information to improve the predicted S. macrospora gene models, and annotated UTRs for more than 50 % of the genes.
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Project description:Enlargement and doming of the shoot apical meristem (SAM) is a hallmark of the transition from vegetative growth to flowering. While this change is widespread, its role in the flowering process is unknown. The late termination (ltm) tomato mutant shows severely delayed flowering and precocious doming of the vegetative SAM. LTM encodes a kelch domain-containing protein, with no link to known meristem maintenance or flowering time pathways. LTM interacts with the TOPLESS (TPL) corepressor and with several transcription factors, providing specificity for its repressive functions. A sub-group of flowering-associated genes are precociously upregulated in vegetative stages of ltm SAMs, among them, the antiflorigen gene SELF PRUNING (SP). A mutation in SP restored the structure of vegetative SAMs in ltm sp double mutants and late flowering was partially suppressed, suggesting LTM functions to suppress SP in the vegetative SAM. In agreement, SP-overexpressing wild type plants exhibited precocious doming of vegetative SAMs combined with late flowering, as found in ltm plants. Strong flowering signals can result in termination of the SAM, usually by its differentiation into a flower. We propose that activation of a floral antagonist that promotes SAM growth in concert with floral transition protects it from such terminating effects.
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Project description:Enlargement and doming of the shoot apical meristem (SAM) is a hallmark of the transition from vegetative growth to flowering. While this change is widespread, its role in the flowering process is unknown. The late termination (ltm) tomato mutant shows severely delayed flowering and precocious doming of the vegetative SAM. LTM encodes a kelch domain-containing protein, with no link to known meristem maintenance or flowering time pathways. LTM interacts with the TOPLESS (TPL) corepressor and with several transcription factors, providing specificity for its repressive functions. A sub-group of flowering-associated genes are precociously upregulated in vegetative stages of ltm SAMs, among them, the antiflorigen gene SELF PRUNING (SP). A mutation in SP restored the structure of vegetative SAMs in ltm sp double mutants and late flowering was partially suppressed, suggesting LTM functions to suppress SP in the vegetative SAM. In agreement, SP-overexpressing wild type plants exhibited precocious doming of vegetative SAMs combined with late flowering, as found in ltm plants. Strong flowering signals can result in termination of the SAM, usually by its differentiation into a flower. We propose that activation of a floral antagonist that promotes SAM growth in concert with floral transition protects it from such terminating effects.
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Project description:RNA-seq analysis of developmental stages from the filamenous ascomycete Sordaria macrospora. Using laser capture microdissection, we separated protoperithecia (young fruiting bodies) from the surrounding hyphae. RNA isolation and amplification from 150 protoperithecia yields enough material for RNA-seq analysis. The resulting data were compared to RNA-seq data from whole mycelial exctracts (total vegetative and total sexual mycelium) to characterize the genome-wide spatial distribution of gene expression during sexual development. We analyzed total vegetative mycelium, total sexual mycelium, and protoperithecia from the wild type as well as protoperithecia from the sterile mutant pro1. Additionally, we used the RNA-seq information to improve the predicted S. macrospora gene models, and annotated UTRs for more than 50 % of the genes. 8 samples were sequenced (2 independent biological replicates for the four conditions "wt sex: SM2, SM7", "wt veg: SM1, SM6", "wt proto: SM4, SM5", "pro1 proto: SM8, SM9", each on one Illumina/Solexa lane (GAII or HiSeq, single reads of 36 or 100 bases))
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