title: Molecular cloning and expression analysis of scd1 gene from large yellow croaker Larimichthys crocea under cold stress.
abstract: Desaturation of fatty acids is an important adaptation mechanism to maintain membrane fluidity under cold stress. To comprehend the mechanism of adaptation to low temperatures in fish, we investigated stearoyl-CoA desaturase 1 (SCD1) endocrine expression in the process of cold acclimation from 15°C to 7°C in Larimichthys crocea. The cDNA and genomic sequences of scd1 were cloned and characterized and named as Lcscd1. The cDNA encoded an iron-containing protein of 337 amino acids with functional motifs. The full-length genome sequence of Lcscd1 was composed of 2556 nucleotides, including five exons and four introns. Tissue expression profiles by qPCR and western blot analysis revealed that Lcscd1 was highly expressed in the liver, followed by the brain. The expression of Lcscd1 mRNA in the liver was firstly down-regulated from 15°C to 11°C, and then up-regulated until the first day of 7°C, followed by a decline until the last day. In the brain, the expression showed no significant change from 15°C to 9°C, but then significantly increased until the last day of 7°C. SCD1 protein expression in the liver decreased from 15°C to the first day of 7°C, and then gradually recovered to the starting level. In the brain, SCD1 protein expression maintained rising trends in the whole process. Immunoelectron microscopic analysis showed that SCD1 was localized in fat granules, mitochondria and granular endoplasmic reticulum of hepatic cells, but only in mitochondria of encephalic cells. The results above suggested that SCD1 expression was responsive to both cold and starvation stresses in the liver, but only to cold stress in the brain. In conclusion, these findings suggested that SCD1 may be involved in fish adaptation to cold stress.
authors.affiliation: Key Laboratory of Healthy Mariculture for the East China Sea, Ministry of Agriculture, Fisheries College, Jimei University, Xiamen 361021, PR China.
authors.forename: Hao
authors.initials: H
authors.lastname: Xu
authors.affiliation: Key Laboratory of Healthy Mariculture for the East China Sea, Ministry of Agriculture, Fisheries College, Jimei University, Xiamen 361021, PR China.
authors.forename: Dong Ling
authors.initials: DL
authors.lastname: Zhang
authors.affiliation: Key Laboratory of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture, South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510300, PR China.
authors.forename: Da Hui
authors.initials: DH
authors.lastname: Yu
authors.affiliation: Key Laboratory of Healthy Mariculture for the East China Sea, Ministry of Agriculture, Fisheries College, Jimei University, Xiamen 361021, PR China.
authors.forename: Chang Huan
authors.initials: CH
authors.lastname: Lv
authors.affiliation: Key Laboratory of Healthy Mariculture for the East China Sea, Ministry of Agriculture, Fisheries College, Jimei University, Xiamen 361021, PR China.
authors.forename: Hui Yu
authors.initials: HY
authors.lastname: Luo
authors.affiliation: Key Laboratory of Healthy Mariculture for the East China Sea, Ministry of Agriculture, Fisheries College, Jimei University, Xiamen 361021, PR China. Electronic address: zywang@jmu.edu.cn.
authors.forename: Zhi Yong
authors.initials: ZY
authors.lastname: Wang
mesh_terms: D000222:Adaptation, Physiological; D000595:Amino Acid Sequence; D000818:Animals; D003001:Cloning, Molecular; D058639:Cold-Shock Response; D029941:Fish Proteins / Q000235:genetics* / Q000378:metabolism; D020869:Gene Expression Profiling; D008969:Molecular Sequence Data; D009928:Organ Specificity; D010473:Perciformes / Q000235:genetics* / Q000378:metabolism; D010802:Phylogeny; D013230:Stearoyl-CoA Desaturase / Q000235:genetics* / Q000378:metabolism; D059467:Transcriptome
chemical_list: D029941:Fish Proteins; D013230:Stearoyl-CoA Desaturase
keywords: Cold challenge; Larimichthys crocea; Stearoyl-CoA desaturase (SCD)