Characterization and distinct expression patterns of PPAR genes in Manila clam Ruditapes philippinarum in response to air exposure
WANG Jing-tian1, CAO Wei-nan1, HUO Zhong-ming1,2, YAN Xi-wu1,2
1.College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China; 2.Engineering Research Center of Shellfish Culture and Breeding in Liaoning Province, Dalian 116023, China
Abstract: The identification, characterization and expression of PPAR gene family (PPARα, PPARβ, PPARγ) were investigated in tissues of Manila clam Ruditapesphilippinarum with shell length of 2.5 cm-3.0 cm exposed to air at low temperature(5 ℃ )and normal temperature(20 ℃)in order to evaluate the role of PPAR gene in Manila clam lipid metabolism under air exposure stress. It was found that the length of open reading frame was 912 bp, encoding 239 amino acids, in PPARα; 1644 bp, encoding 547 amino acids, in PPARβ and 2124 bp, encoding 707 amino acids, in PPARγ. The phylogenetic tree showed that PPARα and PPARγ had high homology in Manila clam with yesso scallop Patinopectenyessoensis; PPARβ with high homology to Pomaceacanaliculata. Quantitative analysis revealed that PPARα/β/γ, a lipid metabolism-related gene, responded to air exposure stimulation to some extent, significant expression inhibition of PPARα and PPARγ by air exposure and low-temperature air exposure (P<0.05). However, the expression of PPARβ was found to be induced, and the effect of air exposure stress on lipid metabolism balance in the clam was significantly higher at 20 ℃ than that at 5 ℃ (P<0.05). The findings indicate that the PPAR gene family of Manila clam is involved in regulation of fatty acid oxidation to maintain energy balance in the clam under air exposure, and that low temperature reduces energy consumption under air exposure, thus resulting in helpping the clam adapt to this environment.
王靖天, 曹纬楠, 霍忠明, 闫喜武. 菲律宾蛤仔 PPAR 基因家族特征分析及干露胁迫下表达变化[J]. 大连海洋大学学报, 2019, 34(2): 168-178.
WANG Jing-tian, CAO Wei-nan, HUO Zhong-ming, YAN Xi-wu, . Characterization and distinct expression patterns of PPAR genes in Manila clam Ruditapes philippinarum in response to air exposure. Journal of Dalian Ocean University, 2019, 34(2): 168-178.