title: CD28/CTLA-4 ligands: the gene encoding CD86 (B70/B7.2) maps to the same region as CD80 (B7/B7.1) gene in human chromosome 3q13-q23.
abstract: CD86 (B70/B7.2) is an antigen of the immunoglobulin superfamily expressed on monocytes, dendritic cells and activated B, T, and natural killer cells. CD86 was recently identified as a second ligand for the T cell antigens CD28 and CTLA-4, and plays an important role in the co-stimulation of T cells in a primary immune response. We report here the assignment of the CD86 gene to human chromosome 3 using Southern blot analysis on a panel of hamster x human somatic cell hybrid genomic DNA. Fluorescence hybridization in situ on metaphase chromosomes coupled with GTG banding (G-bands by trypsin using Giemsa staining) confirmed this assignment and localized the CD86 gene to 3q13-q23 region. The CD86 gene is, therefore, located in the proximity of the CD80 (B7/B7.1) gene, the first identified ligand for CD28 and CTLA-4, previously mapped to chromosome 3q13.3-q21. Deletions, inversions and insertions of chromosome 3q21-q26, as well as translocations of 3q21 with other chromosomes have been described in many cases of acute myeloid leukemia (AML), acute non-lymphocytic leukemia (ANLL), chronic myeloid leukemia (CML) and myelodisplastic syndromes (MDS), suggesting that this region contains several genes involved in the leukemic process.
authors.affiliation: Unidad de Biología Molecular, Hospital de la Princesa, Universidad Autónoma de Madrid, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Fernández-Ruiz
authors.forename: C
authors.initials: C
authors.lastname: Somoza
authors.forename: F
authors.initials: F
authors.lastname: Sánchez-Madrid
authors.forename: L L
authors.initials: LL
authors.lastname: Lanier
mesh_terms: D000818:Animals; D015703:Antigens, CD; D018122:B7-1 Antigen / Q000235:genetics*; D051940:B7-2 Antigen; D018106:CD28 Antigens / Q000378:metabolism; D002871:Chromosome Banding; D002874:Chromosome Mapping; D002893:Chromosomes, Human, Pair 3; D006224:Cricetinae; D005796:Genes; D006801:Humans; D006822:Hybrid Cells; D017404:In Situ Hybridization, Fluorescence; D007938:Leukemia / Q000235:genetics / Q000473:pathology; D008562:Membrane Glycoproteins / Q000235:genetics*
chemical_list: D015703:Antigens, CD; D018122:B7-1 Antigen; D051940:B7-2 Antigen; D018106:CD28 Antigens; C497964:CD86 protein, human; D008562:Membrane Glycoproteins