Ontology highlight
ABSTRACT:
PROVIDER: PRJNA836751 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR19320535_1.fastq.gz | Fastqsanger.gz | |||
| SRR19320535_2.fastq.gz | Fastqsanger.gz | |||
| SRR19320536_1.fastq.gz | Fastqsanger.gz | |||
| SRR19320536_2.fastq.gz | Fastqsanger.gz | |||
| SRR19320537_1.fastq.gz | Fastqsanger.gz |
Items per page: 5 1 - 5 of 17 |
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Project description:Polyploidization events are known to trigger extensive epigenetic and transcriptional alteration of the duplicated or merged genomes, accompanied by small- and large-scale conformational changes. The genome of modern hexaploid wheat (Triticum aestivum L.; 2n = 6x = 42) is the product of two rounds of interspecific hybridization between three closely related diploid species, resulting in the presence of distinct but highly syntenic sub-genomes (AA, BB and DD). We examined the large-scale chromatin architecture of the nucleus of wheat using Hi-C, a genome-wide chromatin conformation capture (3C) method and GISH, (genomic in situ hybridization). We found evidence that physical interactions occur with significantly higher frequency within sub genomes (A with A, B with B or D with D) than between sub genomes (A with B or D, etc. ...), defining sub-nuclear “genomic territories”. In addition, we observed a polarized distribution of facultative and constitutive heterochromatin that suggests a functional compartmentalization within the nucleus. On a local scale, we found that genes tend to interact mainly with other genes over long-distance “loops” that are especially established between genes presenting similar expression levels and bearing the same histone marks. Moreover, gene pairs in spatial proximity show similar changes in expression levels between shoots and roots. Consistently, we found that physical contact between genes is mediated by RNA polymerase II (RNAPII). Immunofluorescence assays with anti RNAP2 antibodies revealed the presence of “transcription factories” in which multiple interacting genes are co-transcribed. This indicates that local-scale topology is an important factor for transcriptional regulation as it determines the micro-compartimentalization of active genes within the nucleus.Our results provide a framework for understanding the physical organization of wheat genome and highlight the interplay between chromosome conformation and gene expression in wheat.
2020-03-02 | GSE133880 | GEO
Project description:Polyploidization events are known to trigger extensive epigenetic and transcriptional alteration of the duplicated or merged genomes, accompanied by small- and large-scale conformational changes. The genome of modern hexaploid wheat (Triticum aestivum L.; 2n = 6x = 42) is the product of two rounds of interspecific hybridization between three closely related diploid species, resulting in the presence of distinct but highly syntenic sub-genomes (AA, BB and DD). We examined the large-scale chromatin architecture of the nucleus of wheat using Hi-C, a genome-wide chromatin conformation capture (3C) method and GISH, (genomic in situ hybridization). We found evidence that physical interactions occur with significantly higher frequency within sub genomes (A with A, B with B or D with D) than between sub genomes (A with B or D, etc. ...), defining sub-nuclear “genomic territories”. In addition, we observed a polarized distribution of facultative and constitutive heterochromatin that suggests a functional compartmentalization within the nucleus. On a local scale, we found that genes tend to interact mainly with other genes over long-distance “loops” that are especially established between genes presenting similar expression levels and bearing the same histone marks. Moreover, gene pairs in spatial proximity show similar changes in expression levels between shoots and roots. Consistently, we found that physical contact between genes is mediated by RNA polymerase II (RNAPII). Immunofluorescence assays with anti RNAP2 antibodies revealed the presence of “transcription factories” in which multiple interacting genes are co-transcribed. This indicates that local-scale topology is an important factor for transcriptional regulation as it determines the micro-compartimentalization of active genes within the nucleus.Our results provide a framework for understanding the physical organization of wheat genome and highlight the interplay between chromosome conformation and gene expression in wheat.
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Project description:We report a method for specific capture of an arbitrary subset of genomic targets for single molecule bisulfite sequencing, and for digital quantitation of DNA methylation at a single nucleotide resolution. We used targeted bisulfite sequencing to characterize the changes of DNA methylation during the de-differentiation of human fibroblasts into hybrid stem cells, and into induced pluripotent stem cells. We compared the methylation level of approximately 66,000 CpG sites within 2020 CpG islands on chromosome 12, chromosome 20, and 34 selected regions. A total of 288 differentially methylated regions were identified between fibroblasts and pluripotent cells. Methylation cluster analysis revealed distinct methylation patterns between fibroblasts and pluripotent cells. Furthermore iPS cells are globally more methylated than human embryonic stem cells, which could be due to the reprogramming process. This targeted bisulfite sequencing method is particularly useful for efficient and large-scale analysis of DNA methylation in organisms with large genomes. Experiment Overall Design: Comparison of DNA methylation on 2020 CpG islands and 34 other selected regions among eleven human ES, iPS and fibroblast lines.
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