Transposable elements (TEs) contribute to stress-related long intergenic noncoding RNAs in Plants (I)
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PROVIDER: PRJNA308602 | ENA |
REPOSITORIES: ENA
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Project description:Transposable elements (TEs) contribute to stress-related long intergenic noncoding RNAs in Plants
| PRJNA357589 | ENA
Project description:Long intergenic noncoding RNAs (lincRNAs) are widespread in cellular organisms, however, the origins and functions of many lincRNAs remain to be explored. Transposable elements (TEs) are widely distributed in many eukaryotic genomes, and often account for large fractions of plant and animal genomes. By using strand-specific RNA sequencing, we profiled the expression patterns of lincRNAs in Arabidopsis, rice and maize, and identified TE-associated lincRNAs (TE-lincRNAs). Stress regulation of some TE-lincRNAs was observed in Arabidopsis. Our findings indicate that TE-associated lincRNAs potentially play important roles in plant abiotic stress responses. Moreover, in the Arabidopsis chromatin remodelling mutant ddm1 that has an altered chromatin state, novel lincRNAs including TE-lincRNAs were generated. The novel lincRNAs were inherited in the subsequent generations in the wild type background, suggesting that lincRNAs could act as an adaptive reservoir in eukaryotes.
2017-01-21 | GSE76798 | GEO
Project description:Long intergenic noncoding RNAs (lincRNAs) are widespread in cellular organisms, however, the origins and functions of many lincRNAs remain to be explored. Transposable elements (TEs) are widely distributed in many eukaryotic genomes, and often account for large fractions of plant and animal genomes. By using strand-specific RNA sequencing, we profiled the expression patterns of lincRNAs in Arabidopsis, rice and maize, and identified TE-associated lincRNAs (TE-lincRNAs). Stress regulation of some TE-lincRNAs was observed in Arabidopsis. Our findings indicate that TE-associated lincRNAs potentially play important roles in plant abiotic stress responses. Moreover, in the Arabidopsis chromatin remodelling mutant ddm1 that has an altered chromatin state, novel lincRNAs including TE-lincRNAs were generated. The novel lincRNAs were inherited in the subsequent generations in the wild type background, suggesting that lincRNAs could act as an adaptive reservoir in eukaryotes.
2017-01-21 | GSE92419 | GEO
Project description: Not available
| S-EPMC5514416 | biostudies-literature
Project description:This SuperSeries is composed of the SubSeries listed below.
2017-01-22 | GSE92444 | GEO
Project description:Transposable elements (TEs) contribute to stress-related long intergenic noncoding RNAs in Plants (I)
2020-04-16 | E-CURD-44 | ExpressionAtlas
Project description:Transposable elements (TEs) are often the primary determinant of genome size differences among eukaryotes. In plants, the proliferation of TEs is countered through epigenetic silencing mechanisms that prevent transposition. Recent studies using the model plant Arabidopsis thaliana have revealed that methylated TE insertions are often associated with reduced expression of nearby genes, and these insertions may be subject to purifying selection due to their effect on nearby genes. Less is known about the genome-wide patterns of epigenetic silencing of TEs in other plant species. Here, we compare the 24-nt siRNA complement from Arabidopsis thaliana and a closely related congener with a two- to three-fold higher TE copy number, A. lyrata. We show that TEs, and particularly siRNA-targeted TEs, are associated with reduced gene expression within both species and also with gene expression differences between orthologs. In addition, A. lyrata TEs are targeted by a lower fraction of uniquely matching siRNAs, which are associated with more effective silencing of TE expression. Overall, our results suggest that the efficacy of RNA-directed DNA methylation silencing is lower in A. lyrata, a finding that may shed light on the causes of differential TE proliferation among species. 4 A. lyrata mRNA-seq samples
2011-02-11 | E-GEOD-24571 | biostudies-arrayexpress
Project description:Background: Transposable elements (TEs) represent a substantial fraction of the genomes, playing a major role in evolution, as sources of genetic variability. To fully appraise the role of TE in the acquisition of genetic novelty in genome evolution, we must also consider the impact of their own transcriptional activity. Results: We studied impact of TE transcriptional activity on gene using high-throughput RNA-Seq sequencing in Drosophila melanogaster. TEs, which turn out to be expressed in euchromatin as well as in heterochromatin, interact with genes at different levels. The observed transcription from TEs involve canonical or non-canonical transcription start sites (TSSs) distributed along their sequence. We also find evidences for potential bidirectional transcription from the TE promoter regions where the antisense transcript is co-opted by the host genome as TSSs of a gene. We found that active TEs seem to accumulate in the 5' upstream regions of the genes, and possibly provide an alternative transcript of the nearby gene. Indeed, predominantly, the TE transcript is collinear and overlapping the gene. Apart from the 5' upstream regions, we also found that most active TEs are transcribed on the gene transcript strand. Conversely, few transcripts from TE are anti sense with respect to the gene. This suggests that they have a disruptive action and are counter-selected. The only exceptions are for TEs located into introns, where they could provide another complex way of gene regulation, and in the 3' downstream region, where other mechanisms akin to siRNAs could take place. Finally, we noted several cases where the cryptic TSS is located on TE fragments corresponding to a low complexity sequence. Frequently these TE fragments appear to be over-represented when close to genes, suggesting a possible selected role. Conclusion: Altogether, these results suggest that active transposable elements influence host gene transcription. It is likely that some features of transposable elements have been exaptated in order to enrich the genes repertoire by opening routes to sub- or neo-functionalization. Examination of the transcription produced by transposable elements in D. melanogaster
2014-01-01 | E-GEOD-52472 | biostudies-arrayexpress
Project description:Arbuscular mycorrhizal (AM) fungi form mutualistic relationships with most land plant species. AM fungi have long been considered as ancient asexuals. Long-term clonal evolution would be remarkable for a eukaryotic lineage and suggests the importance of alternative mechanisms to promote genetic variability facilitating adaptation. Here, we assessed the potential of transposable elements (TEs) for generating genomic diversity. The dynamic expression of TEs during Rhizophagus irregularis spore development suggests ongoing TE activity. We find Mutator-like elements located near genes belonging to highly expanded gene families. Characterising the epigenomic status of R. irregularis provides evidence of DNA methylation and small RNA production occurring at TE loci. Our results support a potential role for TEs in shaping the genome, and roles for DNA methylation and small RNA-mediated silencing in regulating TEs. A well-controlled balance between TE activity and repression may therefore contribute to genome evolution in AM fungi.
2022-02-17 | PXD025245 | Pride
Project description:Investigation of the effect of the knockdown of AT-hook motif DNA binding nuclear matrix protein TRANSPOSABLE ELEMENT KILLER (TEK) in the Arabidopsis Landsberg erecta (Ler) background Transposable elements (TEs) are silenced by epigenetic mechanisms of DNA and histone methylation. The repressive histone modification H3 lysine 9 dimethylation (H3K9me2) is TE-associated epigenetic hallmark, and is necessary for DNA methylation. However the mechanism to direct the repressive epigenetic modification in TEs has remained elusive. Here we show that knockdown of the AT-hook motif DNA binding nuclear matrix protein TRANSPOSABLE ELEMENT KILLER (TEK) in the Arabidopsis Landsberg erecta (Ler) background results in robust activation of various TEs, the repeat-containing floral repressor gene FWA and the TE-containing floral repressor FLOWERING LOCUS C (FLC). A four chip study using two separate wild-type seedling mRNA samples and two separate TEKi seedling mRNA samples
2012-09-12 | E-GEOD-39158 | biostudies-arrayexpress