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ABSTRACT: Unveiling the mycobiome marvels of shared lichen genera across borders: comparing fungal community inside Parmelia and Peltigera between Turkey and South Korea

PROVIDER: PRJNA1035977 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
	SRR26723224_1.fastq.gz	Fastqsanger.gz
	SRR26723224_2.fastq.gz	Fastqsanger.gz
	SRR26723225_1.fastq.gz	Fastqsanger.gz
	SRR26723225_2.fastq.gz	Fastqsanger.gz
	SRR26723226_1.fastq.gz	Fastqsanger.gz

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Project description:Genome organization is driven by forces affecting transcriptional state, but the relationship between transcription and genome architecture remains unclear. Here, we identified the Drosophila transcription factor Motif 1 Binding Protein (M1BP) in physical association with the gypsy chromatin insulator core complex, including the universal insulator protein CP190. M1BP is required for enhancer-blocking and barrier activities of the gypsy insulator as well as its proper nuclear localization. Genome-wide, M1BP specifically colocalizes with CP190 at Motif 1-containing promoters, which are enriched at topologically associating domain (TAD) borders. M1BP facilitates CP190 chromatin binding at many shared sites and vice versa. Both factors promote Motif 1-dependent gene expression and transcription near TAD borders genome-wide. Finally, loss of M1BP reduces chromatin accessibility and increases both inter- and intra-TAD local genome compaction. Our results reveal physical and functional interaction between CP190 and M1BP to activate transcription at TAD borders and mediate chromatin insulator-dependent genome organization.

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Chromatin organization in 3D distinguishes the influences of dMes-4/NSD and Hypb/dSet2 in protecting genes from H3K27me3 silencing

Project description:Maintenance of gene expression programs requires cell-type specific barcoding of genomes through euchromatin interspaced with facultative heterochromatin domains where PRC1/2 hinder chromatin accessibility thereby repressing genes inside such domains. At heterochromatin-euchromatin borders, regulation of heterochromatin spreading may depend on transcriptional activity, histone modifiers, and chromatin barrier insulators or the borders of topological associated domain (TADs). Here we show that depletion of H3K36 di- or tri-methyl histone methyl transferases dMes-4/NSD or Hypb/dSet2 induces H3K27me3 spreading at H3K27me3 borders, accounting for the repression of hundreds of genes upon depletion of these enzymes. dMes-4/NSD influences genes within active chromatin hubs and flanked by H3K27me3 borders demarcated by a TAD border, unlike dHypb/dSet2 that protects genes near H3K27me3 borders in absence of a TAD border. Insulator mutants that disrupt 3D chromatin hubs recapitulate only the H3K27me3 spreading observed upon depletion of dMes-4/NSD, and not of Hypb/dSet2. Hi-C data demonstrate how dMes-4/NSD directly block the propagation of the long-range interactions marking the inactive TADs, onto neighbor active regions, unlike Hypb/dSet2. Our data thus show a division of labor between dMes-4/NSD and Hypb/dSet2 to protect genes against H3K27me3 silencing, highlighting a direct influence of H3K36me marks on the demarcation of H3K27me3 domains within repressive TADs.

2023-07-01 | GSE146993 | GEO

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