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Cutaneous immune responses in the common carp detected using transcript analysis.

Santiago Fernandez Gonzalez1, Nikolaos Chatziandreou, Michael Engelbrecht Nielsen

  • 1Department of Veterinary Pathobiology, Laboratory for Fish Diseases, The Royal Veterinary and Agricultural University, Stigbøjlen 7, DK-1870 Frederiksberg C, Denmark. xanti@usc.es

Molecular Immunology
|October 20, 2006
PubMed
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This study identified 61 novel immune-related genes in common carp (Cyprinus carpio L.) during ectoparasitic infection. These findings highlight the fish skin

Area of Science:

  • * Aquaculture and Fish Immunology
  • * Molecular Biology and Genomics
  • * Infectious Disease Research

Background:

  • * Common carp (Cyprinus carpio L.) are vital aquaculture species susceptible to ectoparasitic infections like Ichthyophthirius multifiliis.
  • * Understanding fish immune responses is crucial for disease management and aquaculture sustainability.
  • * Previous research has identified some immune genes, but a comprehensive understanding in carp is lacking.

Purpose of the Study:

  • * To identify novel immune-related genes in common carp following Ichthyophthirius multifiliis infection.
  • * To characterize the expression patterns of key immune genes in different tissues and time points post-infection.
  • * To elucidate the role of fish skin in the immune defense against parasitic challenges.

Main Methods:

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  • * Construction of two cDNA libraries from carp skin at 3 and 72 hours post-infection.
  • * Expressed Sequence Tag (EST) sequencing and analysis to identify immune gene orthologues.
  • * Real-time quantitative PCR (RQ-PCR) to evaluate transcript levels of selected immune genes (PGDS, IFN, SCYA103, C7, FP, FD, beta(2)m-2) in skin, blood, and liver.

Main Results:

  • * Identified 82 immune-related gene orthologues, with 61 being novel for common carp.
  • * Described full-length molecules of prostaglandin D2 synthase (PGDS), CC chemokine SCYA103, and beta(2)-microglobulin-2 (beta(2)m-2).
  • * Observed differential gene expression: PGDS and beta(2)m-2 were down-regulated in skin, while C7 and SCYA103 were up-regulated in liver post-infection. Most transcripts showed higher expression in skin of uninfected fish.

Conclusions:

  • * The study significantly expands the repertoire of known immune-related genes in common carp.
  • * Identified novel genes like PGDS, SCYA103, and beta(2)m-2 play roles in carp's immune response.
  • * Fish skin is confirmed as a critical site for immune gene expression during parasitic infections, highlighting its active role in defense.