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Owenia Genome Project

ABSTRACT: The genome of the early-branching annelid Owenia fusiformis

PROVIDER: PRJEB38497 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	ERR10504274_1.fastq.gz	Fastqsanger.gz
	ERR10504274_2.fastq.gz	Fastqsanger.gz
	ERR10504275_1.fastq.gz	Fastqsanger.gz
	ERR10504275_2.fastq.gz	Fastqsanger.gz

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Owenia fusiformis

Project description:Owenia fusiformis

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

Project description:Owenia fusiformis has a unique mitraria larvae form which is different to other marine spiralians. we utilize RNA-seq and ATAC-seq to profile the gene expression and chromatin accessibility to understand their development and evolution.

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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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The adult tissue transcriptome of Owenia fusiformis

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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The adult tissue transcriptome of Owenia fusiformis

Project description:The adult tissue transcriptome of Owenia fusiformis

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Owenia

Project description:Owenia sp. overview

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Developmental systesms drift in dorsoventral patterning is linked to transitions to autonomous development in Annelida

Project description:The Bone Morphogenetic Protein (BMP) pathway is the ancestral signalling defining the dorsoventral axis in bilaterally symmetrical animals. However, Spiralia, a large bilaterian clade including molluscs and annelids, uses the Fibroblast Growth Factor pathway and ERK1/2 as the ancestral cue to establish their posterodorsal side. How this profound change in axial patterning evolved and what it implied for BMP’s developmental role remains elusive. Here, we studied four annelid species and combined disruption of the BMP and Activin/Nodal pathways with transcriptomics and blastomere deletions to demonstrate that BMP is ancestrally downstream of ERK1/2 and promotes dorsoventral development in Spiralia. Importantly, this signalling hierarchy is lost in annelids that secondarily transitioned into a maternally controlled, autonomous development. While some, like Capitella teleta, use Activin/Nodal, the annelid Platynereis dumerilii relies on BMP to establish dorsoventral polarity only in the head. Unexpectedly, this divergence in upstream axial regulators implied extensive rewiring of downstream targets, as inferred by comparing C. teleta and Owenia fusiformis. Our data clarify the ancestral BMP’s axial role in Spiralia, unveiling a potential causal link between parallel shifts to autonomous cell-fate specification in early development and the emergence of developmental system drift, a pervasive yet poorly understood phenomenon in animal embryogenesis.

2026-03-18 | GSE297936 | GEO

Owenia sp. SA-2015 strain:A5908

Project description:Owenia sp transcriptome

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ERK1/2-RNAseq_Owenia

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

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