title: Cloning and characterization of SREBP-1 and PPAR-α in Japanese seabass Lateolabrax japonicus, and their gene expressions in response to different dietary fatty acid profiles.
abstract: In the present study, putative cDNA of sterol regulatory element-binding protein 1 (SREBP-1) and peroxisome proliferator-activated receptor α (PPAR-α), key regulators of lipid homoeostasis, were cloned and characterized from liver of Japanese seabass (Lateolabrax japonicus), and their expression in response to diets enriched with fish oil (FO) or fatty acids such as palmitic acid (PA), stearic acid (SA), oleic acid (OA), α-linolenic acid (ALA), and n-3 long-chain polyunsaturated fatty acid (n-3 LC-PUFA), was investigated following feeding. The SREBP-1 of Japanese seabass appeared to be equivalent to SREBP-1a of mammals in terms of sequence feature and tissue expression pattern. The stimulation of the mRNA expression level of SREBP-1 in liver of Japanese seabass by dietary fatty acids significantly ranked as follows: PA, OA>SA, ALA, and n-3 LC-PUFA>FO. A new PPAR-α subtype in Japanese seabass, PPAR-α2, was cloned in this study, which is not on the same branch with Japanese seabass PPAR-α1 and mammalian PPAR-α in the phylogenetic tree. Liver gene expression of PPAR-α1 of Japanese seabass was inhibited by diets enriched with ALA or FO compared to diets enriched with PA or OA, while the gene expression of PPAR-α2 of Japanese seabass was up-regulated by diets enriched with ALA or n-3 LC-PUFA compared to diets enriched with OA or FO. This was the first evidence for the great divergence in response to dietary fatty acids between PPAR-α1 and PPAR-α2 of fish, which indicated probable functional distribution between PPAR-α isotypes of fish.
authors.affiliation: Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture), Ocean University of China, 5 Yushan Road, Qingdao, Shandong 266003, China; Key Laboratory of Mariculture (Ministry of Education), Ocean University of China, 5 Yushan Road, Qingdao, Shandong 266003, China.
authors.forename: Xiaojing
authors.initials: X
authors.lastname: Dong
authors.affiliation: Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture), Ocean University of China, 5 Yushan Road, Qingdao, Shandong 266003, China; Key Laboratory of Mariculture (Ministry of Education), Ocean University of China, 5 Yushan Road, Qingdao, Shandong 266003, China.
authors.forename: Houguo
authors.initials: H
authors.lastname: Xu
authors.affiliation: Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture), Ocean University of China, 5 Yushan Road, Qingdao, Shandong 266003, China; Key Laboratory of Mariculture (Ministry of Education), Ocean University of China, 5 Yushan Road, Qingdao, Shandong 266003, China.
authors.forename: Kangsen
authors.initials: K
authors.lastname: Mai
authors.affiliation: Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture), Ocean University of China, 5 Yushan Road, Qingdao, Shandong 266003, China; Key Laboratory of Mariculture (Ministry of Education), Ocean University of China, 5 Yushan Road, Qingdao, Shandong 266003, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Xu
authors.affiliation: Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture), Ocean University of China, 5 Yushan Road, Qingdao, Shandong 266003, China; Key Laboratory of Mariculture (Ministry of Education), Ocean University of China, 5 Yushan Road, Qingdao, Shandong 266003, China.
authors.forename: Yanjiao
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Aquaculture Nutrition and Feed (Ministry of Agriculture), Ocean University of China, 5 Yushan Road, Qingdao, Shandong 266003, China; Key Laboratory of Mariculture (Ministry of Education), Ocean University of China, 5 Yushan Road, Qingdao, Shandong 266003, China. Electronic address: qhai@ouc.edu.cn.
authors.forename: Qinghui
authors.initials: Q
authors.lastname: Ai
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001492:Bass / Q000235:genetics* / Q000378:metabolism; D004041:Dietary Fats; D005227:Fatty Acids / Q000737:chemistry*; D015870:Gene Expression; D050356:Lipid Metabolism; D008969:Molecular Sequence Data; D009928:Organ Specificity; D047493:PPAR alpha / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D010802:Phylogeny; D012333:RNA, Messenger / Q000378:metabolism; D051780:Sterol Regulatory Element Binding Protein 1 / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism
chemical_list: D004041:Dietary Fats; D005227:Fatty Acids; D047493:PPAR alpha; D012333:RNA, Messenger; D051780:Sterol Regulatory Element Binding Protein 1
keywords: Dietary fatty acids; Gene expression; Japanese seabass; PPAR-α; SREBP-1