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The RING-containing protein, JMJ24 mono-ubiquitinates RDR2 to coordinate histone methylation and DNA methylation in Arabidopsis.

ABSTRACT: JMJ24 is a RING motif containing Jumonji protein, whose E3 ligase activity is essential for communication between histone methylation and DNA methylation.In Arabidopsis JMJ24 is higly expressed in mature pollen. JMJ24 interacted with RDR2 and a single C4HC3 RING motif enabled JMJ24 to mono-ubiquitinate RDR2 for stabilization. RDR2 acted downsteam of JMJ24 for DNA methylation and local silencing. Here we performed tiling-array-based transcriptome profiling using mature pollen collected from WT and jmj24-1 and found that hundreds of loci encoding transposon elements, noncoding RNAs and protein-coding genes are regulated by JMJ24. WT vs. jmj24-1

ORGANISM(S): Arabidopsis thaliana

SUBMITTER: Jun Liu

PROVIDER: E-GEOD-29708 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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The RING-containing protein, JMJ24 mono-ubiquitinates RDR2 to coordinate histone methylation and DNA methylation in Arabidopsis.

Project description:JMJ24 is a RING motif containing Jumonji protein, whose E3 ligase activity is essential for communication between histone methylation and DNA methylation.In Arabidopsis JMJ24 is higly expressed in mature pollen. JMJ24 interacted with RDR2 and a single C4HC3 RING motif enabled JMJ24 to mono-ubiquitinate RDR2 for stabilization. RDR2 acted downsteam of JMJ24 for DNA methylation and local silencing. Here we performed tiling-array-based transcriptome profiling using mature pollen collected from WT and jmj24-1 and found that hundreds of loci encoding transposon elements, noncoding RNAs and protein-coding genes are regulated by JMJ24.

2011-12-01 | GSE29708 | GEO

Transcription profiling of Arabidopsis pollen and semi in vivo- and in vitro-grown pollen tubes.

Project description:Pollen tubes extend through pistil tissues and are guided to ovules where they release sperm for fertilization. Although pollen tubes can germinate and elongate in a synthetic medium, their trajectory is random and their growth rates are slower compared to growth in pistil tissues. Furthermore, interaction with the pistil renders pollen tubes competent to respond to guidance cues secreted by specialized cells within the ovule. The molecular basis for this potentiation of the pollen tube by the pistil remains uncharacterized. We used a surgical procedure to obtain large quantities of uncontaminated pollen tubes that grew through the pistil and defined their transcriptome by microarray analysis. We also characterized the transcriptome of in vitro-grown pollen tubes (for 0.5hours or 4hours) and dessicated mature pollen in Arabidopsis. Experiment Overall Design: Pollen and pollen tubes were collected as described in the protocols section for RNA extraction and hybridization on Affymetrix ATH1 Genechip microarrays.

2009-08-15 | E-GEOD-17343 | biostudies-arrayexpress

Small noncoding RNAs in tomato pollen

Project description:We used tomato pollen in order to identify pollen stage-specific small non-coding RNAs (sncRNAs) and their target mRNAs. We further deployed elevated temperatures to discern stress responsive sncRNAs. For this purpose high throughput sncRNA-sequencing was performed for three-replicated sncRNAs libraries derived from tomato tetrad, post-meiotic, and mature pollen under control and heat stress conditions.

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High-throughput Sequencing of Small RNAs from Pollen and Silk and Characterization of miRNAs Involved in Pollen-Silk Interactions in Maize

Project description:In this study, we sequenced four small RNA libraries derived from mature pollens, in vitro germinated pollens, mature silks and pollinated silks of maize, respectively. In total, 161 known miRNAs belonging to 27 families and 82 novel miRNAs were identified. Of them, miRNAs involved in pollen-silk (pistil) interactions were analyzed. On the male side, miRNA differentially expressed between mature and germinated pollen were identified, some of them participate in pollen germination and tube growth. On the female side, silk-expressed miRNAs respond to pollination were also responsive to stresses, especially drought and fungal invasion. Furthermore, GO analysis of target genes revealed that members related to anxin signal transduction and gene expressional regulation were overrepresented.The results indicated that during pollen-silk interactions, miRNAs-mediated auxin signal transduction plays important roles, and miRNAs took part in complex transcriptional regulating network. Examination of 4 different tissues of maize to provide novel information for understanding the post-transcriptional regulations of pollen-pistil interactions

2013-03-02 | E-GEOD-44787 | biostudies-arrayexpress

Gene expression analysis in stigma during compatible and in-compatible pollination reactions in Lolium perenne

Project description:The expression analysis had two goals: (1) look at relative transcription within mature pollen grains (2) compare expression in the stigma during pollination with either compatible or in-compatible pollen. Two pairwise comparisons, (i) unpollinated stigma vs. stigma pollinated with compatible pollen, and (ii) unpollinated stigma vs stigma pollinated with incompatible pollen. The genotype where stigma samples were harvested from is F1-30, and this is also the pollen source during an incompatible pollination reaction. The compatible pollen source is the variety Foxtrot (heterogeneous populations).

2015-10-26 | E-MTAB-3760 | biostudies-arrayexpress

Transcription profiling of mature pollen grains from wild type and AtMIKC* MADS-box gene knock-out Arabidopsis plants

Project description:Effects of loss-of-function of AtMIKC* MADS-box genes on the mature Arabidopsis pollen transcriptome.

2007-12-04 | E-MEXP-1138 | biostudies-arrayexpress

Phosphoproteomics profiling of tobacco mature pollen and pollen activated in vitro

Project description:Tobacco mature pollen has extremely desiccated cytoplasm, and is metabolically quiescent. Upon re-hydration it becomes metabolically active and that results in later emergence of rapidly growing pollen tube. These changes in cytoplasm hydration and metabolic activity are accompanied by protein phosphorylation. In this study, we subjected mature pollen, 5-min-activated pollen, and 30-min-activated pollen to TCA/acetone protein extraction, trypsin digestion and phosphopeptide enrichment by titanium dioxide. The enriched fraction was subjected to nLC-MS/MS. We identified 471 phosphopeptides that carried 432 phosphorylation sites, position of which was exactly matched by mass spectrometry. These 471 phosphopeptides were assigned to 301 phosphoproteins, since some proteins carried more phosphorylation sites. Of the 13 functional groups, the majority of proteins were put into these categories: transcription, protein synthesis, protein destination and storage, and signal transduction. Many proteins were of unknown function, reflecting the fact that male gametophyte contains many specific proteins that have not been fully functionally annotated. The quantitative data highlighted the dynamics of protein phosphorylation during pollen activation; the identified phosphopeptides were divided into seven groups based on the regulatory trends. The major group comprised mature pollen-specific phosphopeptides that were dephosphorylated during pollen activation. Several phosphopeptides representing the same phosphoprotein had different regulation, which pinpointed the complexity of protein phosphorylation and its clear functional context. Collectively, we showed the first phosphoproteomics data on activated pollen where the position of phosphorylation sites was clearly demonstrated and regulatory kinetics was resolved.

2016-01-27 | PXD003042 | Pride

Transcription profiling of Arabidopsis sperm cells compared to FACS-sorted mature pollen grains and seedlings

Project description:Comparative transcriptional profiling of FACS-sorted Arabidopsis thaliana sperm cells versus FACS-sorted mature pollen grains and seedlings

2008-08-01 | E-ATMX-35 | biostudies-arrayexpress

Transcription profiling by high throughput sequencing of 7 tissues of maize inbred line Zheng 58

Project description:RNA-sequencing of 5 tissues of maize inbred line Zheng 58: mature silk (MS), mature pollen (MP), mature ovary (MO), and 6-days old seedling (SL), immature silk (IMS)

2013-01-26 | E-MTAB-964 | biostudies-arrayexpress

Characterization of the small RNA populations of developing Arabidopsis thaliana pollen.

Project description:Small RNA diversity and function has been widely characterized in various tissues of the sporophytic generation of the angiosperm model Arabidopsis thaliana. In contrast, there is limited knowledge about small RNA diversity and their roles in developing male gametophytes. We thus carried out small RNA sequencing on RNA isolated from four stages of developing Arabidopsis thaliana pollen. Spores from 4 stages of pollen development (UNM: Uninucleate microspore M-bM-^@M-^S BCP: Bicellular pollen M-bM-^@M-^S TCP: Tricellular pollen M-bM-^@M-^S MP: Mature pollen) were isolated using a percoll gradient-based method (Honys and Twell, 2004) and the small RNA fraction for each sample was isolated and sequenced by Illumina technology. Reference: Honys, D. and Twell, D. (2004) Transcriptome analysis of haploid male gametophyte development in Arabidopsis. Genome Biol. 5/11/R85.

2014-07-01 | E-GEOD-34190 | biostudies-arrayexpress

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