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Molecular cloning and expression patterns of two tumor necrosis factor alpha genes in crucian carp (Carassius carassius)

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Abstract

Tumor necrosis factor (TNF[31]) is a potent inflammatory cytokine produced during inflammation. In this study, two crucian carp TNF-α genes, TNFα-1 and TNFα-2, were cloned and sequenced. The TNFα-1 is 720 bp long and consists of a 699 bp opening reading frame (ORF) encoding 232 amino acids and TNFα-2 is 793 bp long and contains an ORF of 687 bp, which encodes 228 amino acids. The genomic structure of both genes consists of 4 exons and 3 introns similar to the other known TNF-α genes. The amino acid sequences of the crucian carp TNFα-1 and TNFα-2 share the highest identity with common carp, goldfish and the lowest with flounder and humans. The phylogenetic analysis grouped crucian carp TNFα-1 and TNFα-2 with other cypriniformes, which are more closely related to goldfish and common carp TNFα-1 and TNFα-2. Real time PCR analysis showed a constitutive expression of crucian carp TNFα-1 and TNFα-2 in all seven tissues examined. The TNFα-1 mRNA was expressed significantly higher in the liver and kidney than those of TNFα-2, while TNFα-2 in turn was expressed significantly higher in the muscle. The Aeromonas hydrophila BSK-10 strain upregulated the expression level of both TNFα-1 and TNFα-2 in all of the tested tissues. At 6 h, the expression levels of TNFα-1 were increased significantly higher in the muscles, skin, and liver, while the expression levels of TNFα-2 were increased significantly higher in the muscles and gills. TNFα-1 was expressed much stronger than TNFα-2. At 12 h the expression levels started to decline and were even lower at 24 h. These results imply that both TNFα-1 and TNFα-2 mRNA are distributed differently in tissues and are implicated in the immune response to bacterial infection.

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Correspondence to L. Xue.

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Published in Russian in Molekulyarnaya Biologiya, 2015, Vol. 49, No. 1, pp. 138–148.

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Kajungiro, R.A., Xue, L. & Aynealem, M. Molecular cloning and expression patterns of two tumor necrosis factor alpha genes in crucian carp (Carassius carassius). Mol Biol 49, 120–129 (2015). https://doi.org/10.1134/S0026893315010021

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  • DOI: https://doi.org/10.1134/S0026893315010021

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