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¹ Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao 266071, Shandong, China
² OceanUniversity of China, Collage of Marine Life Sciences, Qingdao 266003, Shandong, China DOI : 10.4194/1303-2712-v11_4_06 Viewed : 4298 - Downloaded : 3387 The full-length cDNA encoding growth hormone (PLGH) of Southern flounder (Paralichthyslethostigma) was cloned by Switching Mechanism At 5' end of the RNA Transcript (SMART) RACE. The sequence was 902 nucleotides long, coding a polypeptide of 190 amino acids and a signal peptide of 17 amino acids. The 5’ and 3’ UTR of the messenger RNA were 131 and 198 nucleotides long respectively. After alignment of the deduced amino acid sequence with other Pleuronectiformes species, a consecutive absence of 14 amino acids segment in the C-terminal was found in all three species ofParalichthyidae. It can be proved that GHs of Paralichthyidae have the shortest length in Pleuronectiformes species. Homology analysis of PLGH cDNA showed the highest score with Paralichthysorbignyanuand the lowest score with Soleasenegalensis. The phylogenetic analysis on complete GH ORF sequences was performed with the maximum parsimony method. In the topology founded, the species fell into three groups: Soleoidei,Paralichthyidae and Pleuronectidae. The exclusive species ofSoleoidei selected in this work,Soleasenegalensis formed an independent branch and showed relatively high mean difference with Paralichthyidae and Pleuronectidae. The results of phylogenetic analysis based on the GH ORF sequences were consistent with the earlier results based on 12S, 16S rDNA and mitochondrial DNA sequences within Pleuronectiformes species, which would suggest the potential credible application of GH ORF sequences in Pleuronectiformes phylogeny. Keywords : Southern flounder (Paralichthyslethostigma), growth hormone, cDNA, sequence characterization, phylogenetic analysis