The cereal seed microbiota
Ontology highlight
ABSTRACT:
PROVIDER: PRJEB36663 | ENA |
REPOSITORIES: ENA
Similar Datasets
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Project description:Histone acetylation is involved in the regulation of gene expression in plants and eukaryotes. Histone deacetylases (HDACs) are enzymes that catalyze the removal of acetyl groups from histones, which is associated with the repression of gene expression. To study the role of histone acetylation in the regulation of gene expression during seed germination, trichostatin A (TSA), a specific inhibitor of histone deacetylase, was used to treat imbibing Arabidopsis thaliana seeds. GeneChip arrays were used to show that TSA induces up-regulation of 45 genes and down-regulation of 27 genes during seed germination. Eight TSA-up-regulated genes were selected for further analysis - RAB18, RD29B, ATEM1, HSP70 and four late embryogenesis abundant protein genes (LEA). A gene expression time course shows that these eight genes are expressed at high levels in the dry seed and repressed upon seed imbibition at an exponential rate. In the presence of TSA, the onset of repression of the eight genes is not affected but the final level of repressed expression is elevated. Chromatin immunoprecipitation and HDAC assays show that there is a transient histone deacetylation event during seed germination at one day after imbibition, which serves as a key developmental signal that affects the repression of the eight genes. This SuperSeries is composed of the SubSeries listed below.
2005-12-10 | GSE3799 | GEO
Project description:Cereal genomes have undergone repeated polyploidization and transposable element (TE) proliferation, collectively generating complex regulatory landscapes. The evolutionary trajectories and functional implications of these landscapes, however, remain largely unexplored. By employing chromatin-bound RNA sequencing across seven cereal species, we systematically mapped 45,952 regulatory element transcripts (RETs), including 32,867 distal RETs corresponding to enhancer RNAs (eRNAs). Our analysis reveals that 56% of lineage-specific eRNAs originate from TE expansions, suggesting TEs as significant reservoirs of species-specific regulatory innovation in cereals. Notably, we uncovered a remarkable similarity in defense-related function, root-specific expression, and TE-derived origin of eRNAs across ancient and recent evolutionary layers of Triticeae, suggesting recurrent recruitment of TE-derived root-associated regulatory elements during Triticeae evolution. Furthermore, we found that young eRNA pairs in hexaploid wheat with high sequence similarity, many originating from RLG_famc8.3 and DTC_famc4.3, exhibit pronounced root specificity and coordinated expression, suggesting a targeted amplification and refinement of the successful ancestral regulatory strategy established after Triticeae divergence. To facilitate community access, we developed Cereal-eRNAdb (http://bioinfo.cemps.ac.cn/Cereal-eRNAdb/), a comprehensive database integrating 69,426 eRNAs with functional annotations across 296 samples. Our work indicates that TE-mediated innovation of root-specific eRNAs as a candidate mechanism that may contribute to Triticeae adaptation and provides a foundational resource for exploiting regulatory variation in cereal crop breeding.
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Project description:Cereal genomes have undergone repeated polyploidization and transposable element (TE) proliferation, collectively generating complex regulatory landscapes. The evolutionary trajectories and functional implications of these landscapes, however, remain largely unexplored. By employing chromatin-bound RNA sequencing across seven cereal species, we systematically mapped 45,952 regulatory element transcripts (RETs), including 32,867 distal RETs corresponding to enhancer RNAs (eRNAs). Our analysis reveals that 56% of lineage-specific eRNAs originate from TE expansions, suggesting TEs as significant reservoirs of species-specific regulatory innovation in cereals. Notably, we uncovered a remarkable similarity in defense-related function, root-specific expression, and TE-derived origin of eRNAs across ancient and recent evolutionary layers of Triticeae, suggesting recurrent recruitment of TE-derived root-associated regulatory elements during Triticeae evolution. Furthermore, we found that young eRNA pairs in hexaploid wheat with high sequence similarity, many originating from RLG_famc8.3 and DTC_famc4.3, exhibit pronounced root specificity and coordinated expression, suggesting a targeted amplification and refinement of the successful ancestral regulatory strategy established after Triticeae divergence. To facilitate community access, we developed Cereal-eRNAdb (http://bioinfo.cemps.ac.cn/Cereal-eRNAdb/), a comprehensive database integrating 69,426 eRNAs with functional annotations across 296 samples. Our work indicates that TE-mediated innovation of root-specific eRNAs as a candidate mechanism that may contribute to Triticeae adaptation and provides a foundational resource for exploiting regulatory variation in cereal crop breeding.
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Project description:Cereal genomes have undergone repeated polyploidization and transposable element (TE) proliferation, collectively generating complex regulatory landscapes. The evolutionary trajectories and functional implications of these landscapes, however, remain largely unexplored. By employing chromatin-bound RNA sequencing across seven cereal species, we systematically mapped 45,952 regulatory element transcripts (RETs), including 32,867 distal RETs corresponding to enhancer RNAs (eRNAs). Our analysis reveals that 56% of lineage-specific eRNAs originate from TE expansions, suggesting TEs as significant reservoirs of species-specific regulatory innovation in cereals. Notably, we uncovered a remarkable similarity in defense-related function, root-specific expression, and TE-derived origin of eRNAs across ancient and recent evolutionary layers of Triticeae, suggesting recurrent recruitment of TE-derived root-associated regulatory elements during Triticeae evolution. Furthermore, we found that young eRNA pairs in hexaploid wheat with high sequence similarity, many originating from RLG_famc8.3 and DTC_famc4.3, exhibit pronounced root specificity and coordinated expression, suggesting a targeted amplification and refinement of the successful ancestral regulatory strategy established after Triticeae divergence. To facilitate community access, we developed Cereal-eRNAdb (http://bioinfo.cemps.ac.cn/Cereal-eRNAdb/), a comprehensive database integrating 69,426 eRNAs with functional annotations across 296 samples. Our work indicates that TE-mediated innovation of root-specific eRNAs as a candidate mechanism that may contribute to Triticeae adaptation and provides a foundational resource for exploiting regulatory variation in cereal crop breeding.
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Project description:Cereal genomes have undergone repeated polyploidization and transposable element (TE) proliferation, collectively generating complex regulatory landscapes. The evolutionary trajectories and functional implications of these landscapes, however, remain largely unexplored. By employing chromatin-bound RNA sequencing across seven cereal species, we systematically mapped 45,952 regulatory element transcripts (RETs), including 32,867 distal RETs corresponding to enhancer RNAs (eRNAs). Our analysis reveals that 56% of lineage-specific eRNAs originate from TE expansions, suggesting TEs as significant reservoirs of species-specific regulatory innovation in cereals. Notably, we uncovered a remarkable similarity in defense-related function, root-specific expression, and TE-derived origin of eRNAs across ancient and recent evolutionary layers of Triticeae, suggesting recurrent recruitment of TE-derived root-associated regulatory elements during Triticeae evolution. Furthermore, we found that young eRNA pairs in hexaploid wheat with high sequence similarity, many originating from RLG_famc8.3 and DTC_famc4.3, exhibit pronounced root specificity and coordinated expression, suggesting a targeted amplification and refinement of the successful ancestral regulatory strategy established after Triticeae divergence. To facilitate community access, we developed Cereal-eRNAdb (http://bioinfo.cemps.ac.cn/Cereal-eRNAdb/), a comprehensive database integrating 69,426 eRNAs with functional annotations across 296 samples. Our work indicates that TE-mediated innovation of root-specific eRNAs as a candidate mechanism that may contribute to Triticeae adaptation and provides a foundational resource for exploiting regulatory variation in cereal crop breeding.
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Project description:Wheat seed germination directly affects wheat yield and quality. The wheat grains mainly include embryo and endosperm, and both play important roles in seed germination, seedling survival and subsequent vegetative growth. ABA can positively regulate dormancy induction and then negatively regulates seed germination at low concentrations. H2O2 treatment with low concentration can promote seed germination of cereal plants. Although various transcriptomics and proteomics approaches have been used to investigate the seed germination mechanisms and response to various abiotic stresses in different plant species, an integrative transcriptome analysis of wheat embryo and endosperm response to ABA and H2O2 stresses has not reported so far. We used the elite Chinese bread wheat cultivar Zhenmai 9023 as material and performed the first comparative transcriptome microarray analysis between embryo and endosperm response to ABA and H2O2 treatments during seed germination using the GeneChip® Wheat Genome Array Wheat seed germination includes a great amount of regulated genes which belong to many functional groups. ABA/H2O2 can repress/promote seed germination through coordinated regulating related genes expression. Our results provide new insights into the transcriptional regulation mechanisms of embryo and endosperm response to ABA and H2O2 treatments during seed germination
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Project description:Histone acetylation is involved in the regulation of gene expression in plants and eukaryotes. Histone deacetylases (HDACs) are enzymes that catalyze the removal of acetyl groups from histones, which is associated with the repression of gene expression. To study the role of histone acetylation in the regulation of gene expression during seed germination, trichostatin A (TSA), a specific inhibitor of histone deacetylase, was used to treat imbibing Arabidopsis thaliana seeds. GeneChip arrays were used to show that TSA induces up-regulation of 45 genes and down-regulation of 27 genes during seed germination. Eight TSA-up-regulated genes were selected for further analysis - RAB18, RD29B, ATEM1, HSP70 and four late embryogenesis abundant protein genes (LEA). A gene expression time course shows that these eight genes are expressed at high levels in the dry seed and repressed upon seed imbibition at an exponential rate. In the presence of TSA, the onset of repression of the eight genes is not affected but the final level of repressed expression is elevated. Chromatin immunoprecipitation and HDAC assays show that there is a transient histone deacetylation event during seed germination at one day after imbibition, which serves as a key developmental signal that affects the repression of the eight genes. Keywords: histone deacetylase inbibition, developmental effects
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