E-MEXP-1246
Ontology highlight
ABSTRACT:
PROVIDER: E-MEXP-1246 | ExpressionAtlas | 2014-07-03
REPOSITORIES: ExpressionAtlas
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| E-MEXP-1246-analysis-methods.tsv | Tabular | |||
| E-MEXP-1246-atlasExperimentSummary.Rdata | Rdata | |||
| E-MEXP-1246-configuration.xml | Xml | |||
| E-MEXP-1246-percentile-ranks.tsv | Tabular | |||
| E-MEXP-1246-zoomifications-log.tsv | Tabular |
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Project description:differential expression between wild-type pistils of Arabidopsis thaliana at late 11 to late 12 floral stages, and similar stage pistils of coatlique mutant which lacks a functional embryo sac
2007-10-02 | E-MEXP-1246 | biostudies-arrayexpress
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Project description:Mutation of the ASHH2 gene has pleiotropic developmental effects. We have focused on the role of ASHH2 in plant reproduction.The aim of the study was to identify changes in gene expression in inflorescences of the ashh2-1/sdg8-1 mutant (SALK_065480, insertion in the gene At1g77300, SDG8/EFS/ASHH2) compared to wt Arabidopsis thaliana (ecotype Colombia) inflorescences. On the female side, close to 80% of mature ovules lack embryo sac. On the male side, anthers frequently develop without pollen sacs or with specific defects in the tapetum layer, resulting in reduction in the number of functional pollen per anther by up to ~90%. ashh2 mutations also result in homeotic changes in floral organ identity. Transcriptional profiling identified more than 300 up-regulated and 600 down-regulated genes in ashh2 mutant inflorescences, whereof the latter included genes involved in determination of floral organ identity, embryo sac and anther/pollen development. This was confirmed by real-time PCR. In the chromatin of such genes (AP1, AtDMC1 and MYB99) we observed a reduction of H3K36 trimethylation (me3), but not H3K4me3 or H3K36me2.
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Project description:Background: Partial pollen and embryo sac sterilities are the two main reasons for low fertility in autotetraploid rice. Our previous study revealed that small RNAs changes may associate with pollen fertility in autotetraploid rice. However, knowledge on comparative analysis between the development of pollen and embryo sac by small RNAs in autotetraploid rice is still unknown. In the present study, WE-CLSM (whole-mount eosin B-staining confocal laser scanning microscopy) and high-throughput sequencing technology was employed to examine the cytological variations and to analyze small RNAs changes during pollen and embryo sac development in autotetraploid rice compared with its diploid counterpart. Results: A total of 321 and 368 differentially expressed miRNAs (DEM) were detected during development of pollen and embryo sac in autotetraploid rice, respectively. Gene Ontology enrichment analysis on the targets of miRNAs-enriched during the development of pollen and embryo sac in autotetraploid rice revealed 30 prominent functional gene classes, such as cell differentiation and signal transduction during embryo sac development. However, only 7 prominent functional gene classes, such as flower development and transcription factor activity, were detected during pollen development. The expression levels of 39 DEM, which revealed interaction with meiosis-related genes, showed opposite expression levels in pollen and embryo sac development. Of these DEM, osa-miR1436_L+3_1ss5CT and osa-miR167h-3p were associated with the female meiosis, while osa-miR159a.1 and osa-MIR159a-p5 were related with the male meiosis. 21nt-phasiRNAs were detected both during pollen and embryo sac development, while 24nt-phasiRNAs were found only in pollen development, which displayed down-regulation in autotetraploid compared to diploid rice and their spatial-temporal expression patterns were similar to osa-miR2275d. 24nt TEs-siRNAs were found to be up-regulated in embryo sac but down-regulated in pollen development. Conclusion: The above results not only provide the small RNAs changes during four landmark stages of pollen and embryo sac development in autotetraploid rice but also have identified specifically expressed miRNAs, especially meiosis-related miRNAs, pollen-24nt-phasiRNAs and TEs-siRNAs in autotetraploid rice. Together, these findings provide a foundation for understanding the effect of polyploidy on small RNAs expression patterns during pollen and embryo sac development that may lead to different abnormalities in autotetraploid rice.
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Project description:Untargeted metabolomic analyses were carried out on seed coat/endosperm and seed embryo (dry seeds) of Arabidopsis thaliana Columbia-0 genotype. Three biological replicates were analyzed for each sample.
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Project description:During sexual reproduction in flowering plants, the two haploid sperm cells embedded within the cytoplasm of a growing pollen tube are carried to the embryo sac for double fertilization. Pollen development in flowering plants is a dynamic process that encompasses changes at transcriptome and epigenome level. While the transcriptome of pollen and sperm cells in Arabidopsis thaliana is well documented, previous analyses were mostly based on expression at gene level. In-depth transcriptome analysis, particularly the extent of alternative splicing at the resolution of sperm cell and vegetative nucleus was still lacking. Therefore, we performed RNA-seq analysis to generate a spliceome map of Arabidopsis sperm cells and vegetative nuclei isolated from mature pollen grains. Based on our de-novo transcriptome assembly we identified 58039 transcripts, including 9681 novel transcripts, of which 2091were expressed in sperm cells and 3600 in vegetative nuclei. Our data from sperm cell and vegetative nucleus identified 468 genes that were regulated both at gene and splicing level, with many having functions in mRNA splicing, chromatin modification, and protein localization. Moreover, a comparison with egg cell RNA-seq data uncovered sex-specific regulation of transcription and splicing factors. Our study provides novel insights into a gamete specific alternative splicing landscape at unprecedented resolution.
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Project description:Arabidopsis thaliana EDA12, embryo sac development arrest 12 [Source:TAIR;Acc:AT2G35950], is expressed in 13 baseline experiment(s);
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Project description:In this study, we identified the genes specifically/preferentially expressed in maize embryo sac and genes differentially expressed before and after pollination in maize embryo sac via RNA-seq. In total, more than 30% of them are unknown functions and more than 80% of which are first reported in maize embryo sac.
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Project description:Arabidopsis thaliana AT5G44060, Embryo sac development arrest protein [Source:UniProtKB/TrEMBL;Acc:Q9FNC0], is differentially expressed in 103 experiment(s);
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