title: Cloning, chromosal mapping, and tissue expression of the gene encoding the human Eph-family kinase ligand ephrin-A2.
abstract: The Eph-related receptor tyrosine kinases constitute a large family of receptors with most members displaying specific expression patterns in the developing embryo. Ligands for Eph receptor tyrosine kinases, recently renamed ephrins, comprise a family of at least 8 membrane-bound members that display promiscuous binding to Eph receptors. Here we report the characterization of a human cDNA clone with high homology to the gene encoding the murine ephrin-A2 ligand. The human gene encodes a single 2.4-kb mRNA with a restricted and developmentally-regulated tissue distribution pattern. In the fetus, ephrin-A2 mRNA is expressed in brain and intestine, whereas in the adult, high levels of ephrin-A2 mRNA are detectable in lung and intestine. Using PCR-based screening of genomic DNA from human x rodent hybrid cell lines, the gene encoding ephrin-A2 (EFNA2) was assigned to chromosome 19. Fluorescence in situ hybridization to metaphase chromosome preparations refined this localization to band p13.3.
authors.affiliation: Department of Immunology, Institute for Cancer Research, The Norwegian Radium Hospital, Oslo, 0310, Norway. h.c.asheim_labmed.uio.no
authors.forename: H C
authors.initials: HC
authors.lastname: Aasheim
authors.forename: F
authors.initials: F
authors.lastname: Pedeutour
authors.forename: J
authors.initials: J
authors.lastname: Grosgeorge
authors.forename: T
authors.initials: T
authors.lastname: Logtenberg
mesh_terms: D000328:Adult; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002874:Chromosome Mapping; D002888:Chromosomes, Human, Pair 19 / Q000235:genetics; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics; D036383:Ephrin-A2; D005333:Fetus / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental; D006801:Humans; D006822:Hybrid Cells; D017404:In Situ Hybridization, Fluorescence; D008024:Ligands; D051379:Mice; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020794:Receptor Protein-Tyrosine Kinases / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity; D014018:Tissue Distribution; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism
chemical_list: D018076:DNA, Complementary; D036383:Ephrin-A2; D008024:Ligands; D012333:RNA, Messenger; D014157:Transcription Factors; D020794:Receptor Protein-Tyrosine Kinases