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ABSTRACT: Stable Chromosome Condensation Revealed by Chromosome Conformation Capture

PROVIDER: PRJNA294186 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR2194100_1.fastq.gz	Fastqsanger.gz
	SRR2194100_2.fastq.gz	Fastqsanger.gz
	SRR2194091_1.fastq.gz	Fastqsanger.gz
	SRR2194091_2.fastq.gz	Fastqsanger.gz
	SRR2194092_1.fastq.gz	Fastqsanger.gz

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Characterization of chromosomal architecture in Arabidopsis thaliana by Chromosome Conformation Capture

Project description:Background: The packaging of long chromatin fibres in the nucleus poses a major challenge, as it must fulfil both physical and functional requirements. Until recently, insight into the chromosomal architecture of plants was mainly provided by cytogenetic studies. Complementary to these analyses, chromosome conformation technologies promise to refine and improve our view on chromosomal architecture and to provide a more generalised description of nuclear organization. Results: Employing circular chromosome conformation capture (4C), this study describes chromosomal architecture in Arabidopsis nuclei from a genome-wide perspective. Surprisingly, the linear organisation of chromosomes is reflected in the genome-wide interactome. In addition, we studied the interplay of the interactome and epigenetic marks and report that the heterochromatic knob on the short arm of chromosome 4 (hk4s) maintained a pericentromere-like interaction profile and interactome despite its euchromatic surrounding. Conclusion: Despite the extreme condensation that is necessary to pack the chromosomes into the nucleus, the Arabidopsis genome appears to be packed in a predictive manner, according to the following criteria: (i) heterochromatin and euchromatin represent two distinct interactomes, (ii) interactions between chromosomes correlates with the linear position on the chromosome arm, and (iii) distal chromosome regions have a higher potential to interact with other chromosomes. This study includes circular chromosome conformation capture (4C) sequencing information of 13 samples, present in two batches, each present in duplicates (A and B). The individual 4C sequencing information can be retrieved by the 4C primer sequence, given in the 4C primer information file.

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Project description:One of the strongest associated type 2 diabetes (T2D) loci reported to date resides within the TCF7L2 gene. Previous studies point to the T allele of rs7903146 in intron 3 as the causal variant at this locus. To aid in the identification of the actual gene(s) under the influence of this variant, we first generated a CRISPR/Cas9 mediated 1.4kb deletion of the genomic region harboring rs7903146 in the HCT116 cell line followed by global gene expression analysis (see experiment E-MTAB-4839). We then carried out high-throughput chromosome conformation capture assays in the HCT116 and NCM460 cell lines and in colon tissue in order to ascertain which of these perturbed genes promoters made consistent physical contact with the genomic region harboring the variant. To assess consistency and reproducibility we utilized two different techniques: Circularized Chromosome Conformation Capture (4C) and Capture C. In both types of assays, after preparing 3C libraries, our bait of interest was the region harboring rs7903146. Loci interacting with such bait are enriched for by inverse PCR in 4C and by oligonucleotide capture in capture C. 4C assays were carried out in the following samples: two on NCM460 cells (using different primer sets), one on HCT116 cells, one on HCT116 cells with a CRISPR/Cas9 mediated 1.4kb deletion of the genomic region harboring the SNP rs7903146, and one on colon tissue. Capture C assays were carried out in one sample each of the cell lines NCM 460 and HCT116. This experiment, coupled with the associated E-MTAB-4839, revealed just one gene, ACSL5, which resides in the same topologically associating domain as TCF7L2.

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