title: Colocalization of X-linked agammaglobulinemia and X-linked immunodeficiency genes.
abstract: Mice that bear the X-linked immunodeficiency (xid) mutation have a B lymphocyte-specific defect resulting in an inability to make antibody responses to polysaccharide antigens. A backcross of 1114 progeny revealed the colocalization of xid with Bruton's agammaglobulinemia tyrosine kinase (btk) gene, which is implicated in the human immune deficiency, X-linked agammaglobulinemia. Mice that carry xid have a missense mutation that alters a highly conserved arginine near the amino-terminus of the btk protein, Btk. Because this region of Btk lies outside any obvious kinase domain, the xid mutation may define another aspect of tyrosine kinase function.
authors.affiliation: Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892.
authors.forename: J D
authors.initials: JD
authors.lastname: Thomas
authors.forename: P
authors.initials: P
authors.lastname: Sideras
authors.forename: C I
authors.initials: CI
authors.lastname: Smith
authors.forename: I
authors.initials: I
authors.lastname: Vorechovský
authors.forename: V
authors.initials: V
authors.lastname: Chapman
authors.forename: W E
authors.initials: WE
authors.lastname: Paul
mesh_terms: D000077329:Agammaglobulinaemia Tyrosine Kinase; D000361:Agammaglobulinemia / Q000201:enzymology / Q000235:genetics* / Q000276:immunology; D000595:Amino Acid Sequence; D000818:Animals; D001402:B-Lymphocytes / Q000201:enzymology / Q000276:immunology; D001483:Base Sequence; D002874:Chromosome Mapping; D003433:Crosses, Genetic; D005260:Female; D005796:Genes; D008040:Genetic Linkage; D007153:Immunologic Deficiency Syndromes / Q000201:enzymology / Q000235:genetics* / Q000276:immunology; D008297:Male; D051379:Mice; D008808:Mice, Inbred CBA; D008817:Mice, Mutant Strains; D008969:Molecular Sequence Data; D009115:Muridae; D009154:Mutation; D011505:Protein-Tyrosine Kinases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D014960:X Chromosome
chemical_list: D011505:Protein-Tyrosine Kinases; D000077329:Agammaglobulinaemia Tyrosine Kinase; C000625949:BTK protein, human; C000625951:Btk protein, mouse