Cited by 16Aquaculture disease management and microbiotaInvertebrate Immune Response MechanismsImmune Response and Inflammation

Dual RNAseq highlights the kinetics of skin microbiome and fish host responsiveness to bacterial infection

Open access
Le Luyer, J., Schull, Q., Auffret, P., Lopez, P., Crusot, M., Belliard, C., Basset, C., Carradec, Q. +3 more·2021·Animal Microbiome

Published version of a preprint

Abstract

Background: Tenacibaculum maritimum is a fish pathogen known for causing serious damage to a broad range of wild and farmed marine fish populations worldwide. The recently sequenced genome of T. maritimum strain NCIMB 2154 T provided unprecedented information on the possible molecular mechanisms involved in the virulence of this species. However, little is known about the dynamic of infection in vivo, and information is lacking on both the intrinsic host response (gene expression) and its associated microbiota. Here, we applied complementary omic approaches, including dual RNAseq and 16S rRNA gene metabarcoding sequencing using Nanopore and short-read Illumina technologies to unravel the host–pathogen interplay in an experimental infection system using the tropical fish Platax orbicularis as model. Results: We showed that the infection of the host is characterised by an enhancement of functions associated with antibiotic and glucans catabolism functions but a reduction of sulfate assimilation process in T. maritimum . The fish host concurrently displays a large panel of immune effectors, notably involving innate response and triggering acute inflammatory response. In addition, our results suggest that fish activate an adaptive immune response visible through the stimulation of T-helper cells, Th17, with congruent reduction of Th2 and T-regulatory cells. Fish were, however, largely sensitive to infection, and less than 25% survived after 96 hpi. These surviving fish showed no evidence of stress (cortisol levels) or significant difference in microbiome diversity compared with controls at the same sampling time. The presence of T. maritimum in resistant fish skin and the total absence of any skin lesions suggest that these fish did not escape contact with the pathogen, but rather that some mechanisms prevented pathogens entry. In resistant individuals, we detected up-regulation of specific immune-related genes differentiating resistant individuals from controls at 96 hpi, which suggests a possible genomic basis of resistance, although no genetic variation in coding regions was found. Conclusion: Here we focus in detail on the interplay between common fish pathogens and host immune response during experimental infection. We further highlight key actors of defence response, pathogenicity and possible genomic bases of fish resistance to T. maritimum .

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Authors
Le Luyer, J., Schull, Q., Auffret, P., Lopez, P., Crusot, M., Belliard, C., Basset, C., Carradec, Q., Poulain, J., Planes, S., & Saulnier, D.
Affiliations
  • Ifremer (FR)
  • Centre National de la Recherche Scientifique (FR)
Venue
Animal Microbiome
Published
2021-05-07
Volume
3
Issue
1
Pages
35-35
ISSN
2524-4671 (ISSN-L)
OpenAlex
W3158104908
Cited by
16
References
102
Citations by year
2026: 2 · 2025: 5 · 2024: 4 · 2023: 1 · 2022: 2 · 2021: 2
FWCI
0.84
Type
journal article
Language
en
Open access
Locations
  • Animal Microbiome (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • Research Square (acceptedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, cc-by)
  • Institutional Archive of Ifremer (French Research Institute for Exploitation of the Sea) (submittedVersion, other-oa)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Ifremer (Capamax)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Aquaculture disease management and microbiota
  • Life Sciences › Immunology and Microbiology › Immunology › Invertebrate Immune Response Mechanisms
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
Keywords
Platax orbicularis, host-pathogen interaction, fish innate immunity, adaptive immune response, Th17 cells, Th2 cells, regulatory T cells, host resistance, immune gene expression, pathogenicity, sulfate assimilation, cortisol, experimental infection

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