title: BXMAS1 identifies a cluster of homologous genes differentially expressed in B cells.
abstract: Characterization of genes activated by anti-IgM crosslinking of BL2 cells identified one gene, designated BXMAS1, that is predicted to be a novel cell surface receptor. The time course of activation indicates maximal transcriptional induction after 24 h. The predicted protein contains 977 aa residues, with a cytoplasmic domain containing 2 ITIM motifs. The ectodomain of the protein contains 6 repeats of characteristic 93 aa sequences which we have designated BXMAS1 domains. These domains correspond to 6 out of 8 Ig-like domains in BXMAS1. A search of the human genome revealed 5 additional closely linked homologous genes many of which contain BXMAS1 domains as well. Analysis of expression in cell lines and tissues suggests a general restriction of expression of these genes to B cells. These genes may be involved in B cell development and differentiation in peripheral lymphoid organs and may be useful markers of B cell stages.
authors.affiliation: Department of Genetics, Boyer Center for Molecular Medicine, Yale University School of Medicine, New Haven, CT 06536, USA. yasuhiro.nakayama@yale.edu
authors.forename: Y
authors.initials: Y
authors.lastname: Nakayama
authors.forename: S M
authors.initials: SM
authors.lastname: Weissman
authors.forename: A L
authors.initials: AL
authors.lastname: Bothwell
mesh_terms: D020816:Amino Acid Motifs; D001402:B-Lymphocytes / Q000166:cytology / Q000378:metabolism*; D001483:Base Sequence; D018414:CD8-Positive T-Lymphocytes / Q000166:cytology / Q000378:metabolism; D002460:Cell Line; D002878:Chromosomes, Human, Pair 1 / Q000235:genetics; D018076:DNA, Complementary / Q000235:genetics / Q000302:isolation & purification; D006801:Humans; D007963:Leukocytes, Mononuclear / Q000166:cytology / Q000378:metabolism; D008969:Molecular Sequence Data; D005810:Multigene Family / Q000502:physiology*; D017434:Protein Structure, Tertiary / Q000235:genetics; D011956:Receptors, Cell Surface / Q000235:genetics*; D011961:Receptors, Fc; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid
chemical_list: D018076:DNA, Complementary; C432367:FCRL5 protein, human; D011956:Receptors, Cell Surface; D011961:Receptors, Fc