title: Molecular cloning and characterization analysis of immunoglobulin M heavy chain gene in European eel (Anguilla anguilla).
abstract: In this study, the immunoglobulin M heavy chain gene of European eel (Anguilla anguilla) was cloned and analyzed. The full-length cDNA of the IgM heavy chain gene (GenBank accession no. EF062515) has 2089 nucleotides encoding a putative protein of 581 amino acids. The IgM heavy chain was composed of leader peptide (L), variable domain (VH), CH1, CH2, Hinge, CH3, CH4, and C-terminus and two novel continuous putative N-glycosylation sites were found close to the second cysteine of CH3 in A. anguilla-H1 and A. anguilla-H2. The deduced amino acid sequence of the European eel IgM heavy chain constant region shared similarities to that of the Ladyfish (Elops saurus), Atlantic salmon (Salmo salar), rainbow trout (Oncorhynchus mykiss), Grass carp (Ctenopharingodon idella), Common carp (Cyprinus carpio), Channel catfish (Ictalurus punctatus), and the orange-spotted grouper (Epinephelus coioides) with the identity of 46.1%, 39.7%, 38.9%, 32.4%, 32.3%, 31.7%, and 30.7%, respectively. The highest level of IgM gene expression was observed in the kidney, followed by the spleen, gills, liver, muscle and heart in the apparently healthy European eels.
authors.affiliation: Institute of Hydrobiology Chinese Academy of Sciences, WuHan 430072, China.
authors.forename: Jianjun
authors.initials: J
authors.lastname: Feng
authors.forename: Ruizhang
authors.initials: R
authors.lastname: Guan
authors.forename: Peng
authors.initials: P
authors.lastname: Lin
authors.forename: Songlin
authors.initials: S
authors.lastname: Guo
mesh_terms: D000595:Amino Acid Sequence; D000811:Anguilla / Q000235:genetics* / Q000276:immunology*; D000818:Animals; D001483:Base Sequence; D003001:Cloning, Molecular; D017931:DNA Primers / Q000235:genetics; D018076:DNA, Complementary / Q000235:genetics; D050438:Genes, Immunoglobulin Heavy Chain; D007075:Immunoglobulin M / Q000235:genetics*; D008969:Molecular Sequence Data; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity; D014018:Tissue Distribution
chemical_list: D017931:DNA Primers; D018076:DNA, Complementary; D007075:Immunoglobulin M