title: Two IFNGR1 homologues in Tetraodon nigroviridis: Origin, expression analysis and ligand-binding preference.
abstract: In the present study, the divergent properties of IFNGR1 isoforms (IFNGR1-1 and IFNGR1-2) were characterized in Tetraodon nigroviridis. Despite the structural similarities between these proteins, two T. nigroviridis IFNGR1 homologues differ from each other not only in their primary nucleotide and amino acid sequences but also in their syntenic structure. Genomic analysis demonstrates the conservation of synteny between the fish IFNGR1-2s and IFNGR1s in higher vertebrates; conversely, the IFNGR1-1 has no corresponding conservation of synteny with Gallus gallus and Homo sapiens, suggesting that the two genes were derived from two different origins. Additionally, their different sensitivities to mitogens and recombinant T. nigroviridis IFN-γs were observed. Furthermore, ligand-binding analysis strongly supported the model proposed in Danio rerio, which suggests that IFNGR1-1 is the major component of the IFN-γrel receptor complex; IFN-γ most likely binds to both IFNGR1-2 and IFNGR1-1. This study is a further step towards elucidating the teleostean IFN-γ system, which is different from that in mammals.
authors.affiliation: State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Provincial Key Laboratory for Aquatic Economic Animals, College of Life Sciences, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China. Electronic address: ludanqi@mail.sysu.edu.cn.
authors.forename: Dan-Qi
authors.initials: DQ
authors.lastname: Lu
authors.affiliation: State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Provincial Key Laboratory for Aquatic Economic Animals, College of Life Sciences, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China.
authors.forename: Ting-Ting
authors.initials: TT
authors.lastname: Leng
authors.affiliation: State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Provincial Key Laboratory for Aquatic Economic Animals, College of Life Sciences, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China.
authors.forename: Xu
authors.initials: X
authors.lastname: Ding
authors.affiliation: State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Provincial Key Laboratory for Aquatic Economic Animals, College of Life Sciences, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China.
authors.forename: Wan
authors.initials: W
authors.lastname: Peng
authors.affiliation: State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Provincial Key Laboratory for Aquatic Economic Animals, College of Life Sciences, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China.
authors.forename: Mi
authors.initials: M
authors.lastname: Yao
authors.affiliation: State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Provincial Key Laboratory for Aquatic Economic Animals, College of Life Sciences, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China.
authors.forename: Shui-Sheng
authors.initials: SS
authors.lastname: Li
authors.affiliation: State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Provincial Key Laboratory for Aquatic Economic Animals, College of Life Sciences, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China.
authors.forename: Hao-Ran
authors.initials: HR
authors.lastname: Lin
authors.affiliation: State Key Laboratory of Biocontrol, Institute of Aquatic Economic Animals and Guangdong Provincial Key Laboratory for Aquatic Economic Animals, College of Life Sciences, Sun Yat-Sen (Zhongshan) University, Guangzhou 510275, PR China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002645:Chickens; D019143:Evolution, Molecular; D006801:Humans; D007371:Interferon-gamma / Q000378:metabolism; D008954:Models, Biological; D011485:Protein Binding; D020033:Protein Isoforms / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D017471:Receptors, Interferon / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D040681:Structural Homology, Protein; D026801:Synteny; D023721:Tetraodontiformes / Q000276:immunology*; D015027:Zebrafish; D000096743:Interferon gamma Receptor
chemical_list: D007371:Interferon-gamma; D020033:Protein Isoforms; D017471:Receptors, Interferon; D000096743:Interferon gamma Receptor
keywords: IFNGR1 isoform; Ligand-binding analysis; Mitogen; Recombinant IFN-γ; Tetraodon nigroviridis