title: Molecular cloning of LILRC1 and LILRC2 in the mouse and the rat, two novel immunoglobulin-like receptors encoded by the leukocyte receptor gene complex.
abstract: We report the molecular cloning of two novel single-member receptor families with homology to LILR/CD85, PIR, and gp49: LILRC1 in the rat and the mouse, and LILRC2 in the rat. LILRC1 and LILRC2 both have two extracellular Ig-like domains and a cytoplasmic tail devoid of any known signaling motifs. The transmembrane regions of LILRC1 and LILRC2 contain an arginine residue, a common feature in receptors that associate with activating adaptor proteins. Rat and mouse LILRC1 are orthologs sharing 81.5% amino acid identity. LILRC2 represents a distinct receptor family, 47.9% identical to LILRC1. No murine LILRC2 ortholog was detected in genome or expressed sequence tag sequence databases. By radiation hybrid mapping, the rat Lilrc1 and Lilrc2 loci were localized to the leukocyte receptor gene complex (LRC) on chromosome 1, and the mouse Lilrc1 locus was mapped to the LRC on chromosome 7. Moreover, the mouse and rat Lilrc1 loci were localized to similar positions within the LRC. As shown by RT-PCR, rat LILRC1 was expressed by B cells, neutrophils, and a macrophage cell line. Transcription of LILRC2 was detected in T cells, B cells, neutrophils, and macrophages.
authors.affiliation: Department of Anatomy, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway. s.e.hoelsbrekken@medisin.uio.no
authors.forename: Sigurd Erik
authors.initials: SE
authors.lastname: Hoelsbrekken
authors.forename: Sigbjørn
authors.initials: S
authors.lastname: Fossum
authors.forename: Erik
authors.initials: E
authors.lastname: Dissen
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D015703:Antigens, CD / Q000235:genetics*; D001483:Base Sequence; D003001:Cloning, Molecular; D006224:Cricetinae; D018076:DNA, Complementary / Q000235:genetics; D015870:Gene Expression; D000075362:Leukocyte Immunoglobulin-like Receptor B1; D051379:Mice; D008969:Molecular Sequence Data; D005810:Multigene Family; D010802:Phylogeny; D021101:Radiation Hybrid Mapping; D051381:Rats; D011971:Receptors, Immunologic / Q000235:genetics*; D017386:Sequence Homology, Amino Acid; D014158:Transcription, Genetic
chemical_list: D015703:Antigens, CD; D018076:DNA, Complementary; C105299:LILRB1 protein, human; D000075362:Leukocyte Immunoglobulin-like Receptor B1; D011971:Receptors, Immunologic