title: A new member of the NY-ESO-1 gene family is ubiquitously expressed in somatic tissues and evolutionarily conserved.
abstract: The NY-ESO-1 gene, located on chromosome Xq28, encodes a cancer/testis antigen in human. Normally expressed only in germ cells, NY-ESO-1 is activated in a wide range of human tumors, eliciting both antibody and cell-mediated immune responses in cancer patients. Clinical immunotherapeutic trials NY-ESO-1 gene products are now ongoing. A closely related gene, LAGE-1, was subsequently identified and shares similar biological features. By database search, we have identified a third member of the human NY-ESO-1 gene family. This gene, designated ESO3, is also located on the X chromosome, clustered with two exact copies of ESO1(NY-ESO-1) and one copy of ESO2(LAGE-1), within a approximately 400 kb segment. The exon-intron structures are conserved among ESO1-3. While ESO1 and ESO2(LAGE-1) share >80% protein sequence identity, homology between ESO3 and the other two members is lower (<50%). ESO3 is also distinctive in that, unlike ESO1 and 2 that are normally expressed only in testis, ESO3 messenger RNA (mRNA) is ubiquitously expressed in somatic tissues. In addition to ESO3, an intronless pseudogene highly homologous to ESO3 was found on chromosome 9, designated psiESO3.A search of the rodent databases identified mouse and rat counterparts of ESO3, named mESO3 and rESO3. mESO3 is similarly located on mouse X chromosome, with conserved exon-intron junctions. Protein sequence of mESO3 is 54% identical to ESO3 (70% identical at the conserved carboxyl end), and 32% to ESO1. mESO3 mRNA is also ubiquitously expressed in somatic tissues, as is rESO3. In addition, an intronless and presumably non-coding, copy of the mESO3, psimESO3, was identified on mouse chromosome 15. No counterpart of the ESO1 or 2 genes was found in rodents.
authors.affiliation: Weill Medical College of Cornell University, New York, NY 10021, USA.
authors.forename: Birgit
authors.initials: B
authors.lastname: Alpen
authors.forename: Ali O
authors.initials: AO
authors.lastname: Güre
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Scanlan
authors.forename: Lloyd J
authors.initials: LJ
authors.lastname: Old
authors.forename: Yao-Tseng
authors.initials: YT
authors.lastname: Chen
mesh_terms: D017398:Alternative Splicing; D000595:Amino Acid Sequence; D000818:Animals; D000951:Antigens, Neoplasm / Q000235:genetics; D000954:Antigens, Surface; D001483:Base Sequence; D017124:Conserved Sequence / Q000235:genetics*; D019143:Evolution, Molecular; D015870:Gene Expression; D006801:Humans; D008297:Male; D008565:Membrane Proteins; D051379:Mice; D008969:Molecular Sequence Data; D011506:Proteins / Q000235:genetics*; D011544:Pseudogenes / Q000235:genetics; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017386:Sequence Homology, Amino Acid; D013737:Testis / Q000378:metabolism
chemical_list: D000951:Antigens, Neoplasm; D000954:Antigens, Surface; C104948:CTAG1B protein, human; C510162:CTAG2 protein, human; D008565:Membrane Proteins; D011506:Proteins; D012333:RNA, Messenger