title: Identification of a second egfr gene in Xiphophorus uncovers an expansion of the epidermal growth factor receptor family in fish.
abstract: The epidermal growth factor receptor (EGFR) gives name to a family of receptors formed by four members in mammals (EGFR, ErbB2, ErbB3, and ErbB4). Members of this family can be activated to become potent oncogenes, and many human and animal tumors express qualitatively or quantitatively altered receptors from this group. We have isolated and characterized a second egfr gene in the melanoma model fish Xiphophorus. Both Xiphophorus egfra and egfrb duplicates are co-orthologs of the mammalian egfr gene. Database analysis showed that not only egfr but also erbB3 and erbB4 are present as duplicates in some fish species. They originated from ancient duplication events that might be consistent with the hypothesis of a fish-specific genome duplication. In Xiphophorus, the egfrb gene underwent a second duplication that generated the melanoma-inducing oncogene Xmrk. The study and comparison of some of the functional characteristics of both Xiphophorus EGF receptors, including expression profile, ligand-binding abilities, and intracellular signal transduction revealed that Xiphophorus Egfra not only shares common features with Egfrb and the human EGFR but also shows significant differences in its functional characteristics. The mechanism of maintenance of these duplicates remains to be clarified.
authors.affiliation: Physiological Chemistry I, Theodor Boveri Institute for Biosciences (Biocenter), University of Würzburg, Würzburg, Germany.
authors.forename: Ana
authors.initials: A
authors.lastname: Gómez
authors.forename: Jean-Nicolas
authors.initials: JN
authors.lastname: Volff
authors.forename: Ute
authors.initials: U
authors.lastname: Hornung
authors.forename: Manfred
authors.initials: M
authors.lastname: Schartl
authors.forename: Claudia
authors.initials: C
authors.lastname: Wellbrock
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D003532:Cyprinodontiformes / Q000235:genetics*; D066246:ErbB Receptors / Q000235:genetics; D029941:Fish Proteins / Q000235:genetics*; D020440:Gene Duplication; D020869:Gene Expression Profiling; D005786:Gene Expression Regulation; D018773:Genes, erbB-1; D008969:Molecular Sequence Data; D010802:Phylogeny; D016415:Sequence Alignment; D015398:Signal Transduction / Q000235:genetics
chemical_list: D029941:Fish Proteins; D066246:ErbB Receptors