title: A novel IgA-like immunoglobulin in the reptile Eublepharis macularius.
abstract: The appearance of antibody genes over evolution coincided with the origin of the vertebrates. Reptiles are of great interest in evolution since they are the link between the amphibians, birds, and mammals. This work describes the presence of a gene in the reptile leopard gecko (Eublepharis macularius) where phylogenetic studies suggest that it is the gene orthologue of immunoglobulin A (IgA) and immunoglobulin X (IgX) in Xenopus. Messenger RNA samples taken from different tissues showed expression of this antibody in intestinal tissue. Data on the structure deduced from the sequence of nucleotides showed an antibody with four domains in the constant region. There is a sequence of 20 amino acids in the C terminus similar to the secretory tail of immunoglobulin M (IgM) and IgA. A detailed analysis of the sequence of amino acids displayed a paradox, i.e., domains CH1 and CH2 showed a clear homology with domains CH1 and CH2 of immunoglobulin Y (IgY) while domains CH3 and CH4 were homologous with domains CH3 and CH4 of IgM. This homology pattern is also seen in Xenopus IgX and bird IgA. The most logical explanation for this phenomenon is that a recombination between the IgM and IgY gave rise to the IgA.
authors.affiliation: Unidad de Inmunología, Hospital do Meixoeiro, Carretera de Madrid s/n, Vigo 36210, Pontevedra, Spain. fgambon@cesga.es
authors.forename: Francisco Gambón
authors.initials: FG
authors.lastname: Deza
authors.forename: Christian Sánchez
authors.initials: CS
authors.lastname: Espinel
authors.forename: Julio Valdueza
authors.initials: JV
authors.lastname: Beneitez
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D007070:Immunoglobulin A / Q000235:genetics; D007136:Immunoglobulins / Q000235:genetics*; D008116:Lizards / Q000235:genetics* / Q000276:immunology*; D008969:Molecular Sequence Data; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000032:analysis; D017386:Sequence Homology, Amino Acid
chemical_list: D007070:Immunoglobulin A; D007136:Immunoglobulins; D012333:RNA, Messenger