Dataset Information

PH drop impacts differentially skin and gut microbiota of the Amazonian fish tambaqui (Colossoma macropomum).

ABSTRACT: Aquatic organisms are increasingly exposed to lowering of environmental pH due to anthropogenic pressure (e.g. acid rain, acid mine drainages). Such acute variations trigger imbalance of fish-associated microbiota, which in turn favour opportunistic diseases. We used the tambaqui (Colossoma macropomum), an Amazonian fish tolerant to significant pH variation in its natural environment, to assess the response of fish endogenous microbiota to acute short-term acid stress. We exposed 36 specimens of tambaquis to acidic water (pH 4.0) over 2 consecutive weeks and sampled cutaneous mucus, feces and water at 0, 7 &14 days. The 16S RNA hypervariable region V4 was sequenced on Illumina MiSeq. After two weeks of acidic exposure, fecal and skin microbiota taxonomic structures exhibited different patterns: skin microbiota was still exhibiting a significantly disturbed composition whereas fecal microbiota recovered a similar composition to control group, thus suggesting a stronger resilience capacity of the intestinal microbiota than cutaneous microbiota.

SUBMITTER: Sylvain FE

PROVIDER: S-EPMC4989189 | biostudies-literature | 2016 Aug

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

pH drop impacts differentially skin and gut microbiota of the Amazonian fish tambaqui (Colossoma macropomum).

Sylvain François-Étienne FÉ Cheaib Bachar B Llewellyn Martin M Gabriel Correia Tiago T Barros Fagundes Daniel D Luis Val Adalberto A Derome Nicolas N

Scientific reports 20160818

Aquatic organisms are increasingly exposed to lowering of environmental pH due to anthropogenic pressure (e.g. acid rain, acid mine drainages). Such acute variations trigger imbalance of fish-associated microbiota, which in turn favour opportunistic diseases. We used the tambaqui (Colossoma macropomum), an Amazonian fish tolerant to significant pH variation in its natural environment, to assess the response of fish endogenous microbiota to acute short-term acid stress. We exposed 36 specimens of ...[more]

PMID: 27535789

Similar Datasets

Project description:Climate change substantially affects biodiversity around the world, especially in the Amazon region, which is home to a significant portion of the world's biodiversity. Freshwater fishes are susceptible to increases in water temperature and variations in the concentrations of dissolved gases, especially oxygen and carbon dioxide. It is important to understand the mechanisms underlying the physiological and biochemical abilities of fishes to survive such environmental changes. In the present study, we applied RNA-Seq and de novo transcriptome sequencing to evaluate transcriptome alterations in tambaqui when exposed to five or fifteen days of the B1, A1B and A2 climate scenarios foreseen by the IPCC. The generated ESTs were assembled into 54,206 contigs. Gene ontology analysis and the STRING tool were then used to identify candidate protein domains, genes and gene families potentially responsible for the adaptation of tambaqui to climate changes. After sequencing eight RNA-Seq libraries, 32,512 genes were identified and mapped using the Danio rerio genome as a reference. In total, 236 and 209 genes were differentially expressed at five and fifteen days, respectively, including chaperones, energetic metabolism-related genes, translation initiation factors and ribosomal genes. Gene ontology enrichment analysis revealed that mitochondrion, protein binding, protein metabolic process, metabolic processes, gene expression, structural constituent of ribosome and translation were the most represented terms. In addition, 1,202 simple sequence repeats were detected, 88 of which qualified for primer design. These results show that cellular response to climate change in tambaqui is complex, involving many genes, and it may be controlled by different cues and transcription/translation regulation mechanisms. The data generated from this study provide a valuable resource for further studies on the molecular mechanisms involved in the adaptation of tambaqui and other closely related teleost species to climate change.

Project description:Purpose: The gene molecular network involved in teleost fish sex determination and differentiation is highly variable among species and even in some cases among populations of the same species. The objectives of the present study were to identify the period of gonadal sex differentiation in tambaqui juveniles, as well as the genes and pathways potentially involved in this process. Methods: Histological analysis of juveniles was carried out to establish a timeline of the gonadal differentiation in tambaqui. Based on that knowledge, ten juveniles were selected before the first evidence of histological sex differentiation and total RNA was extracted from their trunks and used for RNA-Sequencing and a subsequent de novo transcriptome assembly. Principal Component Analysis (PCA) of the whole transcriptome data was used to cluster samples into two distinct groups: putative males and putative females. Differential gene expression, functional annotation and gene enrichment were used to identify genes and pathways related to sex differentiation in tambaqui to which was applied the Mann-Whitney non-parametric t test (p <0.05) confirming the statistical significance of the expression dimorphism between the groups. Results: The first sign of histological sex differentiation in tambaqui was the formation of the ovarian cavity detected in individuals measuring about 40 mm in total length. Before the differentiation period, components of the Wnt / β-catenin pathway, fox and fst genes (p <0.05) suggest female sex development in the putative females, whereas antagonistic pathways (gsk3b, wt1 and fgfr2), sox9 and genes for androgen synthesis (p <0.05) are indicative of a male-like differentiation. Conclusions: Tambaqui juveniles prior to the morphological ovarian differentiation present the Wnt / β-catenin pathway exerting putative role on the sex differentiation target, either upregulated in female-like individuals, or antagonized in male-like individuals. Thus, the present work provides a molecular basis for future studies on the application of tambaqui monosex cultivation.

Dataset Information

PH drop impacts differentially skin and gut microbiota of the Amazonian fish tambaqui (Colossoma macropomum).

Publications

pH drop impacts differentially skin and gut microbiota of the Amazonian fish tambaqui (Colossoma macropomum).

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets