Transcriptional profiles underlying parent-of-origin effects in seeds of Arabidopsis thaliana
Ontology highlight
ABSTRACT:
ORGANISM(S): Arabidopsis thaliana
SUBMITTER: Reiner Schulz
PROVIDER: E-GEOD-20007 | biostudies-arrayexpress |
REPOSITORIES: biostudies-arrayexpress
Similar Datasets
Project description:Crossing plants of the same species but different ploidies can have dramatic effects on seed growth, but little is known about the alterations to transcriptional programmes responsible for this. Parental genomic imbalance particularly affects proliferation of the endosperm, with an increased ratio of paternally to maternally contributed genomes (‘paternal excess’) associated with overproliferation, while maternal excess inhibits endosperm growth. One interpretation is that interploidy crosses disrupt the balance in the seed of active copies of parentally imprinted genes. This is supported by the observation that mutations in imprinted FIS-class genes of Arabidopsis thaliana share many features of the paternal excess phenotype. Here we investigated gene expression underlying parent-of-origin effects in Arabidopsis through transcriptional profiling of siliques generated by interploidy crosses and FIS-class mutants. Two biological replicate samples each of 2xX2x, 2xX4x, 2xX6x, 6xX2x, 4xX2x and fis1X2x and a single sample of msi1. Each sample was hybridised to a separate array.
2010-08-26 | E-GEOD-20005 | biostudies-arrayexpress
Project description:Crossing plants of the same species but different ploidies can have dramatic effects on seed growth, but little is known about the alterations to transcriptional programmes responsible for this. Parental genomic imbalance particularly affects proliferation of the endosperm, with an increased ratio of paternally to maternally contributed genomes (‘paternal excess’) associated with overproliferation, while maternal excess inhibits endosperm growth. One interpretation is that interploidy crosses disrupt the balance in the seed of active copies of parentally imprinted genes. This is supported by the observation that mutations in imprinted FIS-class genes of Arabidopsis thaliana share many features of the paternal excess phenotype. Here we investigated gene expression underlying parent-of-origin effects in Arabidopsis through transcriptional profiling of siliques generated by interploidy crosses and FIS-class mutants. Six biological samples: 2xX2x, 2xX4x, 2xX6x, 6xX2x, 4xX2x and fis1X2x. Each non-2xX2x cross was co-hybridised with 2xX2x to a two-colour array (5 arrays). Dyes were then swapped and the hybridisations repeated using an additional 5 arrays.
2010-08-26 | E-GEOD-20006 | biostudies-arrayexpress
Project description:Seed development is dependent on a well-orchestrated interplay between different transcriptional programs operating in the embryo, the endosperm and the maternally derived seed coat. In angiosperms, the embryo and the endosperm are products of double fertilization during which the two pollen sperm cells fuse with the egg cell and the central cell of the female gametophyte. In Arabidopsis, mutation of the cell cycle regulator CYCLIN DEPENDENT KINASE A;1 (CKDA;1) results in pollen that only successfully fertilizes the egg cell. Seeds generated from crosses with cdka;1 pollen develop endosperm with solely maternal and no paternal contribution. Here we have exploited cdka;1 fertilization as a novel tool for genomic dissection of parental effects during seed development. We have generated genome-wide transcription profiles of cdka;1 fertilized seeds. By this approach, we identified 11 differentially expressed AGAMOUS-LIKE (AGL) genes encoding Type-I MADS-box transcription factors. Here, AGL36 was chosen for an in-depth study. We show that AGL36 is imprinted and only expressed from the maternal genome. In addition, we demonstrate that AGL36 imprinting is controlled by the activity of METHYLTRANSFERASE1 (MET1) maintenance DNA methyltransferase and DEMETER (DME) DNA glycosylase. Interestingly, our data also show that the active maternal allele of AGL36 is regulated throughout endosperm development by components of the FIS Polycomb Repressive Complex 2 (PRC2). These findings shed novel light on the interplay between maternal and paternal genomes in the seed and how imprinting is coordinated by different mechanisms. 3 biological replicates, each consisting of 35 siliques from 10 individual plants, were used. Arabidopsis thaliana wild type (ecotype Colombia-0 and Ler-0) and cdka;1 mutant (At3g48750 /SALK_109806) were sown out on soil and grown under the following conditions: 18oC day and 18oC night, 16 hr day length with 30 min adjustment of light to on and off, and 85 μmol/m2/sek in light intensity. For each replica, 10 Ler plants were emasculated and pollinated after 48 hours, either with individual WT Col or with individual cdka;1 mutant pollen. Three days after pollination (3 DAP), the siliques of each biological replicate were dissected with hypodermic needles to remove carpel walls, the pistil with pollen attached to it and the pedicel with abcsission zone. The remaining seeds attached to the middle lamella were harvested in bulk in liquid nitrogen at the same time of the day. Biological replicas are dye-swapped between slides.
2010-10-20 | E-GEOD-24809 | biostudies-arrayexpress
Project description:In angiosperms, endosperm plays a crucial role in coordinating seed development through genetic balance and molecular interaction, and is the primary tissue where genomic imprinting occurs. To identify small interfering RNA (siRNA) “imprintome” and its paternal transcriptome activation in early developing maize endosperms, we performed high-throughput small RNA sequencing of whole kernels at 0, 3 and 5 days after pollination (DAP) and endosperms at 7, 10 and 15 DAP, using B73 by Mo17 reciprocal crosses. We observed gradually increased expression of paternal siRNAs in 3- and 5-DAP kernels and balanced contribution of parental siRNA transcriptome in 7-DAP endosperm, followed by identification 460 imprinted siRNA loci with majority (456/460, 99.1%) being maternally expressed that occurred at 10 DAP. Genome-wide scanning found 13 imprinted genes harboring imprinted siRNA loci within their 2-Kb flanking regions, which was significantly different from random probability based on simulation analysis. Finally, gene ontology categories of “response to auxin stimulus”, “response to brassinosteroid stimulus” and “regulation of gene expression” for genes harboring 10-DAP specific siRNAs and “nutrient reservoir activity”, “protein localization to vacuole” and “secondary metabolite biosynthetic process” for genes harboring 15-DAP specific siRNAs indicated that siRNAs could be involved in influencing specific cellular or biochemical processes that are essential for endosperm development, e.g. nutrient uptake and allocation. Although the mechanism of how these siRNAs regulating endosperm key events remains unclear, this study provided us an alternative perspective of siRNA function in plant. The unpollinated kernels (0 DAP), the kernels of 3, 5 DAP and endosperms of 7 10, 15 DAP from the B73 and Mo17 reciprocal crosses were used to perform high-throughput sequencing using the Illumina HiSeq2000 platform
2013-11-26 | E-GEOD-52726 | biostudies-arrayexpress
Project description:Seed size is important to crop domestication and natural selection and is affected by the balance of maternal and paternal genomes in endosperm. Endosperm, like placenta in mammals, provides reserves to the developing embryo. Interploidy crosses disrupt the genome balance in endosperm and alter seed size. Specifically, paternal-excess crosses (2 M-CM-^W 4) delay endosperm cellularization (EC) and produce larger seeds, whereas maternal-excess crosses (4 M-CM-^W 2) promote precocious EC and produce smaller seeds. The mechanisms for responding to the parental genome dosage imbalance and for gene expression changes in endosperm are unknown. In plants, RNA polymerase IV (PolIV or p4) encoded by NRPD1a is required for biogenesis of a major class of 24-nt small interfering RNAs (also known as p4-siRNAs), which are predominately expressed in developing endosperm. Here we show that p4-siRNA accumulation depends on the maternal genome dosage, and maternal p4-siRNAs target transposable elements (TEs) and TE-associated genes (TAGs) in seeds. The p4-siRNAs correlate negatively with expression levels of AGAMOUS-LIKE (AGL) genes in endosperm of interploidy crosses. Moreover, disruption of maternal NRPD1a expression is associated with p4-siRNA reduction and AGL up-regulation in endosperm of reciprocal crosses. This is unique genetic evidence for maternal siRNAs in response to parental genome imbalance and in control of transposons and gene expression during endosperm development. 8 samples: 2x X 2x seed,leaf; 4x X 4x seed,leaf; 2x X 4x seed,leaf; 4x X 2x seed,leaf.
2011-11-11 | E-GEOD-25280 | biostudies-arrayexpress
Project description:Self-inhibition of pollen tubes plays a key role in SI, but the underlying mechanism in Camellia oleifera is poorly understood. Collection of secreted proteins from Camellia oleifera pollen tubes and ovaries for high-throughput sequencing.
2023-03-11 | PXD035406 | Pride
Project description:Plants of different ploidy levels are separated by a strong postzygotic hybridization barrier that is established in the endosperm. Deregulated parent-of-origin specific genes are causal for the response to interploidy hybridizations, revealing an epigenetic basis of this phenomenon. In this study we present evidence that paternal hypomethylation can bypass the interploidy hybridization barrier by alleviating the requirement of the epigenetic Polycomb Repressive Complex 2 (PRC2) in the endosperm. Bypass of the barrier is mediated by suppressed expression of imprinted genes. We show that hypomethylated pollen causes redistribution of CHG methylation to PRC2 target genes, revealing that different epigenetic modifications can functionally substitute for each other. Our work presents a method and the underlying mechanism for the generation of viable triploids, providing an impressive example for the potential of epigenome manipulations for plant breeding. Examination of DNA methylation in Arabidopsis endosperm, embryo, and pollen, and gene expression in seeds
2014-09-22 | E-GEOD-53642 | biostudies-arrayexpress
Project description:Imprinted gene expression occurs during seed development in plants and is associated with differential DNA methylation of parental alleles, particularly at proximal transposable elements (TEs). Imprinting variability could contribute to observed parent-of-origin effects on seed development. We investigated intraspecific variation in imprinting, coupled with analysis of DNA methylation and small RNAs, among three Arabidopsis strains with diverse seed phenotypes. The majority of imprinted genes were parentally biased in the same manner among all strains. However, we identified several examples of allele-specific imprinting correlated with intraspecific epigenetic variation at a TE. We successfully predicted imprinting in additional strains based on methylation variability. We conclude that there is standing variation in imprinting even in recently diverged genotypes due to intraspecific epiallelic variation. These data demonstrate that epiallelic variation and genomic imprinting intersect to produce novel gene expression patterns in seeds. Sequencing of 12 small RNA samples from whole seeds 6 days after pollination.
2014-07-08 | E-GEOD-52807 | biostudies-arrayexpress
Project description:As in animals, cell-cell communication plays pivotal role in male-female recognition during plant sexual reproduction. Prelaid peptides secreted from the female reproductive tissues guide pollen tubes towards ovules for fertilization. However, the elaborate mechanisms for this dialogue have remained elusive, particularly from the male perspective. We perform genome-wide quantitative liquid chromatography coupled tandem mass spectrometry of a pistil-stimulated pollen tube secretome and identify 801 pollen tube-secreted proteins. Interestingly, in silico analysis reveals that the pollen tube-secretome is dominated by unconventional-type secreted proteins representing 57% of the total secretome. In support, we show that unconventional-type protein, translationally controlled tumor protein, is secreted to the apoplast. Remarkably, we discover that this protein could be secreted by infiltrating through the initial phases of the conventional secretory pathway and could reach the apoplast via exosomes as demonstrated by co-localization with Oleisin1 exosome marker. We demonstrate that Arabidopsis thaliana translationally controlled tumor protein-knockdown plants have pollen tubes that poorly navigate to the target ovule, and the knocked down allele is poorly transmitted through the male. We show that regulators of the endoplasmic reticulum-trans-golgi network protein secretory pathway control secretion of pollen tube-secreted cysteine-rich proteins, including pollen tube attractants, and are essential for pollen tube growth and guidance, as well as ovule-targeting competence. This work, the first pollen tube secretome study, identifies novel genome-wide pollen tube-secreted proteins with potential function in pollen tube-ovule guidance for sexual reproduction. Functional analysis highlights a potential mechanism for pollen tube unconventional protein secretion and reveals likely regulators of pollen tube protein secretion. The association of pollen tube-secreted proteins with marker proteins shown to be secreted via exosomes in other species suggest secretion via exosomes as a possible mechanism for cell-cell communication between the pollen tube and female reproductive cells. For processed dataset with quantitative information, see Hafidh S, Potesil D, Fila J et al. Genome Bilogy 2016.
2016-03-18 | PXD002215 | Pride
Project description:The Arabidopsis thaliana central cell, the companion cell of the egg, undergoes DNA demethylation prior to fertilization, but the targeting preferences and biological significance of this process remain unclear. Here, we show that active DNA demethylation mediated by the DEMETER DNA glycosylase accounts for all of the demethylation in the central cell, and preferentially targets small, AT-rich and nucleosome-depleted transposable elements. The vegetative cell, the companion cell of sperm, also undergoes DEMETER-dependent demethylation of similar sequences, and lack of DEMETER in vegetative cells causes reduced small RNA-directed DNA methylation of transposons in sperm. Our results demonstrate that demethylation in companion cells reinforces transposon methylation in plant gametes, thereby assuring stable silencing of transposable elements across generations Examination of DNA methylation in Arabidopsis endosperm, embryo, and pollen
2012-09-21 | E-GEOD-38935 | biostudies-arrayexpress