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doi: 10.1038/ng0992-31
pmid: 1303245
Interleukin-8 (IL-8) is the prototype for a family of at least eight neutrophil chemoattractants whose genes map to human chromosome 4q13-q21. Two human IL-8 receptors, IL8RA and IL8RB, are known from cDNA cloning; IL8RA is a promiscuous receptor for at least two other related ligands, GRO alpha and NAP-2. We now report cloning of the genes for IL8RA, IL8RB and a recently inactivated pseudogene of receptor A (IL8RAP). These form a cluster of only three genes in the superfamily of G protein-coupled receptors (GPCRs) and map to 2q34-q35. The coevolutionary diversity displayed by the IL-8 ligand-receptor complex--ligand promiscuity for IL-8, receptor promiscuity for IL8RA, gene duplication for both ligands and receptors and gene extinction in the case of IL8RAP--is unprecedented for the GPCR superfamily.
Base Sequence, Sequence Homology, Amino Acid, Molecular Sequence Data, Chromosome Mapping, DNA, Biological Evolution, Polymerase Chain Reaction, Receptors, Interleukin-8A, Multigene Family, Humans, Amino Acid Sequence, Chromosomes, Human, Pair 4, Receptors, Immunologic, Pseudogenes
Base Sequence, Sequence Homology, Amino Acid, Molecular Sequence Data, Chromosome Mapping, DNA, Biological Evolution, Polymerase Chain Reaction, Receptors, Interleukin-8A, Multigene Family, Humans, Amino Acid Sequence, Chromosomes, Human, Pair 4, Receptors, Immunologic, Pseudogenes
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