Molecular characterization and expression analysis of the IFN-gamma related gene (IFN-gammarel) in grass carp Ctenopharyngodon idella

Chen, W.Q., Xu, Q.Q., Chang, M.X., Zou, J., Secombes, C.J., Peng, K.M., and Nie, P.
Veterinary Immunology and Immunopathology   134(3-4): 199-207 (Journal)
Registered Authors
Nie, Pin
Grass carp, IFN-γ related gene, Reovirus, Peptidoglycan, Nucleotide oligomerization domain
MeSH Terms
  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • Carps/genetics*
  • Carps/immunology*
  • Carps/virology
  • Cloning, Molecular
  • DNA Primers/genetics
  • DNA, Complementary/genetics
  • Fish Diseases/genetics
  • Fish Diseases/immunology
  • Fish Proteins/genetics*
  • Gene Expression
  • Interferon-gamma/genetics*
  • Molecular Sequence Data
  • Phylogeny
  • Reoviridae Infections/genetics
  • Reoviridae Infections/immunology
  • Reoviridae Infections/veterinary
  • Reverse Transcriptase Polymerase Chain Reaction
  • Sequence Homology, Amino Acid
  • Spleen/immunology
19800136 Full text @ Vet. Immunol. Immunopathol.
Interferon gamma (IFN-gamma), the only member of the type II class of interferons, has been identified in teleost fish. In addition to the IFN-gamma gene, fish possess an IFN-gamma related gene (IFN-gammarel) neighbouring the authentic IFN-gamma gene in the genome. In the present study, the cDNA sequence encoding 167 amino acids of IFN-gammarel and its genomic organization were identified in grass carp Ctenopharyngodon idella. The predicted protein sequence of grass carp IFN-gammarel (gcIFN-gammarel) showed 63% and 50% identities to zebrafish and common carp IFN-gammarel (previously termed as IFN-gamma1), respectively. The IFN-gammarel gene consists of 4 exons, with 3 intervening introns, spanning approximately 2kb of genomic sequence. The gcIFN-gammarel gene did not contain any polymorphic DNA repeats in the introns. Realtime PCR analysis showed that grass carp reovirus induced a high and long lasting (from days 1 to 7) expression of gcIFN-gammarel in spleen. The expression of gcIFN-gammarel in blood, head kidney, trunk kidney and spleen was also increased by bacterial peptidoglycan (PGN), lipopolysaccharide (LPS) and the interferon inducer polyI:C. The highest induction of gcIFN-gammarel expression by PGN was observed in spleen, then in blood and head kidney. Further analysis of the expression patterns of gcIFN-gammarel and PGN receptors, nucleotide oligomerization domains (NOD) 1 and 2, may suggest that IFN-gammarel was possibly activated in a NOD2-dependent mechanism.
Genes / Markers
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Mutation and Transgenics
Human Disease / Model Data
Sequence Targeting Reagents
Engineered Foreign Genes
Errata and Notes