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ABSTRACT: Exploring the molecular basis of diapause I induction in the annual killifish Garcialebias charrua: a transcriptomic approach

PROVIDER: PRJNA904249 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR22376035_1.fastq.gz	Fastqsanger.gz
	SRR22376035_2.fastq.gz	Fastqsanger.gz
	SRR22376036_1.fastq.gz	Fastqsanger.gz
	SRR22376036_2.fastq.gz	Fastqsanger.gz
	SRR22376037_1.fastq.gz	Fastqsanger.gz

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Embryonic developmental arrest in the annual killifish Austrolebias charrua: a proteomic approach to diapause III.

Project description:Diapause is a reversible developmental arrest faced by many organisms in harsh environments. Annual killifish present this mechanism in three possible stages of development. Killifish are freshwater teleosts from Africa and America that live in ephemeral ponds, which dry up in the dry season. The juvenile and adult populations die, and the embryos remain buried in the bottom mud until the next rainy season. Thus, species survival is entirely embryo-dependent, and they are perhaps the most remarkable extremophile organisms among vertebrates. The aim of the present study was to gather information about embryonic diapauses with the use of a “shotgun” proteomics approach in diapause III and prehatching Austrolebias charrua embryos. Our results provide insight into the molecular mechanisms of diapause III. We detected a diapause-dependent change in a large group of proteins involved in different functions, such as metabolic pathways and stress tolerance, as well as proteins related to DNA repair and epigenetic modifications. Furthermore, we observed a diapauseassociated switch in cytoskeletal proteins. This first glance into global protein expression differences between prehatching and diapause III could provide clues regarding the induction/maintenance of this developmental arrest in A. charrua embryos. There appears to be no single mechanism underlying diapause and the present data expand our knowledge of the molecular basis of diapause regulation. This information will be useful for future comparative approaches among different diapauses in annual killifish and/or other organisms that experience developmental arrest.

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Project description:In order to understand molecular basis of cardiac ageing in killifish, we have performed RNA Seq on the ventricular regions of young and aged killifish. Experiment was performed in biological triplicates.

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Project description:Embryonic diapause is a widely occurring evolutionary adaptation phenomenon in animals. Artemia is one of the classic animal models for diapause research. The current studies of Artemia diapause mainly focus on the induction and maintenance of the embryonic diapause, but there is little research on the molecular regulatory mechanism of Artemia embryonic diapause termination (EDT) and embryonic reactivation. Here the gene expression of Artemia cyst in diapause stage and 5 hours after embryonic diapause termination (EDT), which is in post-diapause stage were tested by ATAC-seq to analyze the mechanism of signal regulation involved in Artemia EDT at the molecular level.

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