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Periophthalmodon schlosseri isolate:wild

ABSTRACT: Periophthalmodon schlosseri isolate:wild Genome sequencing and assembly

PROVIDER: PRJNA232436 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	JACM01.dat.gz	Other
	JACM01.fasta.gz	Fasta.gz
	JACM01.master.dat	Other
	JACM01.dat.gz	Other

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Transcriptome Analysis of the Basal Chordate Botryllus schlosseri Reveals a Set of Genes Associated with Fertility

Project description:Background: Gonad differentiation is an essential function for all sexually reproducing species, and many aspects of these developmental processes are highly conserved among the metazoa. The colonial ascidian, Botryllus schlosseri is a chordate model organism which offers two unique traits that can be utilized to characterize the genes underlying germline development: a colonial life history and variable fertility. These properties allow individual genotypes to be isolated at different stages of fertility and gene expression can be characterized comprehensively. Results: Here we characterized the transcriptome of both fertile and infertile colonies throughout blastogenesis (asexual development) using differential expression analysis. We identified genes (as few as 7 and as many as 647) regulating fertility in Botryllus at each stage of blastogenesis. Several of these genes appear to drive gonad maturation, as they are expressed by follicle cells surrounding both testis and oocyte precursors. Spatial and temporal expression of differentially expressed genes was analyzed by in situ hybridization, confirming expression in developing gonads. Conclusion: We have identified several genes expressed in developing and mature gonads in B. schlosseri. Analysis of genes upregulated in fertile animals suggests a high level of conservation of the mechanisms regulating fertility between basal chordates and vertebrates. mRNA profiles of seven infertile stages from infertile Botryllus schlosseri colonies (each in triplicates) and seven stages of fertile Botryllus schlosseri colonies (each in triplicates) using Illumina deep sequencing and analyzed for differential expression between each stage.

2015-01-12 | E-GEOD-62112 | biostudies-arrayexpress

Periophthalmodon schlosseri

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The onset of whole-body regeneration in Botryllus schlosseri: morphological and molecular characterization

Project description:Colonial tunicates are the only chordates that regularly regenerate a fully functional whole body as part of their asexual life cycle, starting from specific epithelia and/or mesenchymal cells. In addition, in some species, whole-body regeneration (WBR) can also be triggered by extensive injuries, which deplete most of their tissues and organs and leave behind only small fragments of their body. In this study we characterized the onset of WBR in Botryllus schlosseri, one colonial tunicate long used as a laboratory model. We first analyzed the transcriptomic response to a WBR-triggering injury. Then, through morphological characterization, in vivo observations via time-lapse, vital dyes, and cell transplant assays, we started to reconstruct the dynamics of the cells triggering regeneration, highlighting an interplay between mesenchymal and epithelial cells. The dynamics described here suggest that WBR in B. schlosseri is initiated by extravascular tissue fragments derived from the injured individuals rather than particular populations of blood-borne cells, as has been described in closely related species. The morphological and molecular datasets here reported provide the background for future mechanistic studies of the WBR ontogenesis in B. schlosseri and allow to compare it with other regenerative processes occurring in other tunicate species and possibly independently evolved.

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