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ERK1/2-RNAseq_Owenia

ABSTRACT: The role of ERK1/2 during spiral cleavage in the annelid Owenia fusiformis

PROVIDER: PRJEB47195 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR6565890_1.fastq.gz	Fastqsanger.gz
	ERR6565890_2.fastq.gz	Fastqsanger.gz
	ERR6565950_1.fastq.gz	Fastqsanger.gz
	ERR6565950_2.fastq.gz	Fastqsanger.gz
	ERR6568240_1.fastq.gz	Fastqsanger.gz

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The developmental transcriptome and epigenome of Owenia fusiformis reveal the development and evolution of mitraria larvae

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The developmental transcriptome and epigenome of Owenia fusiformis reveal the development and evolution of mitraria larvae [dataset2]

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Expression data from ERK1/2 null endothelial cells

Project description:Angiogenesis is a complex process orchestrated by both growth factors and cell adhesion to the extracellular matrix and is initiated by focal degradation of the vascular basement membrane with subsequent migration and proliferation of endothelial cells (EC). The Ras/Raf/MEK/ERK pathway is critical for EC function during angiogensis. Although in vitro studies implicate ERK1 and ERK2 in EC survival, their precise role in EC function in vivo remains poorly defined. Cre/loxP technology was used to inactivate Erk1 and Erk2 in EC during murine development, resulting in embryonic lethality due to a drastic reduction in angiogenesis. The angiogenic defect was linked to diminished EC proliferation and migration, but not to increased cell apoptosis. Expression of key cell cycle regulators was diminished in the double knockout cells. In addition, both Paxillin and Focal Adhesion Kinase were expressed at lower levels and failed to correctly localize to the cell membrane in EC lacking Erk1 and Erk2, leading to defects in the organization of the cytoskeleton and in cell motility. The results demonstrate that ERK1 and ERK2 coordinate cell proliferation and migration during angiogenesis. Lentivirus infected cells to generate ERK1/2 WT and ERK1/2 DKO endothelial cells were cultured, RNA was extracted and Affymetrix gene expression arrays were performed.

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Annelid methylomes reveal ancestral developmental and ageing-associated epigenetic erosion across Bilateria

Project description:Background DNA methylation in the form of 5-methylcytosine (5mC) is the most abundant base modification in animals. However, 5mC levels vary widely across taxa. Whilst vertebrate genomes are hypermethylated, in most invertebrates, 5mC concentrates on constantly and highly transcribed genes (gene body methylation; GbM) and, in some species, on transposable elements (TEs), a pattern known as ‘mosaic’. Yet, the role and developmental dynamics of 5mC and how these explain interspecific differences in DNA methylation patterns remain poorly understood, especially in Spiralia, a large clade of invertebrates comprising nearly half of the animal phyla. Results Here, we generate base-resolution methylomes for three species with distinct genomic features and phylogenetic positions in Annelida, a major spiralian phylum. All possible 5mC patterns occur in annelids, from typical invertebrate intermediate levels in a mosaic distribution to hypermethylation and methylation loss. GbM is common to annelids with 5mC, and methylation differences across species are explained by taxon-specific transcriptional dynamics or the presence of intronic TEs. Notably, the link between GbM and transcription decays during development, alongside a gradual and global, age-dependent demethylation in adult stages. Additionally, reducing 5mC levels with cytidine analogues during early development impairs normal embryogenesis and reactivates TEs in the annelid Owenia fusiformis. Conclusions Our study indicates that global epigenetic erosion during development and ageing is an ancestral feature of bilateral animals. However, the tight link between transcription and gene body methylation is likely more important in early embryonic stages, and 5mC-mediated TE silencing probably emerged convergently across animal lineages.

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Project description:Owenia fusiformis is an ancestral sister group to the annelids, it has a unique "head larvae" type named mitraria larvae. To identify the gene expressed in different tissues, especially the gene expressed in head region, we dissected the 5 female worms and 1 male worm to get 9 different tissues, and extracted their RNA. The sequencing were performed on BGISEQ-500 platform, and the mapping were done with Kallisto and normalization was performed with DEseq2.

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