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Poecilia reticulata isolate:Scarborough

ABSTRACT: RNA-seq analysis of the guppy immune response against Gyrodactylus bullatarudis infection

PROVIDER: PRJNA526802 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR8718930.fastq.gz	Fastqsanger.gz
	SRR8718921.fastq.gz	Fastqsanger.gz
	SRR8718931.fastq.gz	Fastqsanger.gz
	SRR8718922.fastq.gz	Fastqsanger.gz
	SRR8718932.fastq.gz	Fastqsanger.gz

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Adaptation response to salt stress in the Poecilia reticulata gut

Project description:Osmoregulation is essential for the survival of aquatic organisms, particularly teleost fish facing osmotic challenges in variable salinity environments. While gills are traditionally associated with ion exchange, the intestine's role in water and salt absorption is gaining attention. We investigated the adaptive responses of the guppy (Poecilia reticulata) intestine to salinity stress, revealing significant morphological and transcriptomic alterations. Through stepwise salt adaptation experiments, we demonstrated the guppy's remarkable salt tolerance compared to zebrafish. Morphological analysis revealed changes in intestinal epithelial cells, particularly in columnar-shaped enterocytes. Transcriptomic analysis identified key genes involved in osmoregulation, tissue remodeling, and immune modulation. Upregulated genes included SLC transporters (SLC12A1, SLC3A1) facilitating ion and water transport, while Fosl2 and Pik3CB indicated tissue repair and growth responses. Conversely, innate immune system genes (e.g., TNFAIP6) showed downregulation, suggesting a shift towards prioritizing osmoregulatory functions over immune responses. Our findings highlight the intricate mechanisms underlying the guppy's adaptation to salinity stress, emphasizing the adaptive advantage of euryhaline fish and providing insights into osmoregulatory mechanisms in aquatic organisms.

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Project description:PCR-free high coverage whole-genome sequencing of the guppy (Poecilia reticulata)

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Project description:Post-mating reproductive isolating mechanisms may be among the earliest reproductive barriers to emerge among incipient species. Trinidadian guppy, Poecilia reticulata, populations in the Caroni and Oropouche drainages in Northern Trinidad exhibit marked genetic divergence and provide an ideal system in which to search for these barriers. We inseminated virgin females with equal amounts of sperm from two males, a 'native' male from the female's own population and a 'foreign' male from the other drainage. Artificial insemination ensured that mating order and mate choice did not affect the outcome. Paternities were assigned to the resulting broods using microsatellite markers. As predicted, sperm from native males had precedence over foreign sperm. Moreover, this effect was symmetrical for both drainages. In contrast, we detected no native sperm precedence in controls, in which females received sperm from the same and another population within the same drainage. Our results show that gametic isolation can arise between geographically proximate, though genetically divergent, populations of a single species and highlight the potential role of this process in speciation.

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