Genetic Organization of Two Types of Flounder Warm-Temperature Acclimation-Associated 65-kDa Protein and Their Gene Expression Profiles.

Bioscience, biotechnology, and biochemistry

PubMedID: 24096660

Kim YO, Park EM, Moon JY, Nam BH, Kim DG, Kong HJ, Kim WJ, Jee YJ, Lee SJ. Genetic Organization of Two Types of Flounder Warm-Temperature Acclimation-Associated 65-kDa Protein and Their Gene Expression Profiles. Biosci Biotechnol Biochem. 2013;.
We isolated and characterized two cDNA clone encoding warm-temperature acclimation-associated 65-kDa proteins (PoWap65-1 and PoWap65-2) from the olive flounder, Paralichthys olivaceus. The deduced amino acid sequences of PoWap65s showed overall identities of 33-73% with other fish Wap65 and mammalian hemopexin-like proteins. The 5'-flanking regions of both PoWap65-encoding genes contained various putative transcriptional elements. While PoWap65-1 and PoWap65-2 were structurally similar, they exhibited highly differential patterns of expression. PoWap65-1 was expressed only in the liver, whereas PoWap65-2 transcripts were detected in a wide range of tissues. The accumulation of PoWap65s mRNA was expressed differentially during development. Expression of them in warm temperatures also differed in flounder embryonic cells. PoWap65-1 was upregulated by temperature stimulation whereas PoWap65-2 was not detected. PoWap65s were highly regulated by Edwardsiella tarda infection and hypoxia. Pathogen challenge induced PoWap65-2 expression in the liver whereas PoWap65-1 was downregulated. Hypoxia induced the expression of both PoWap65s in the liver of juvenile fish.