title: Genomic characterization of equine interleukin-4 receptor alpha-chain (IL4R).
abstract: Three overlapping fragments of the equine interleukin-4 receptor alpha chain gene (IL4R) were cloned and sequenced. The resulting 3553 bp cDNA sequence exhibited homology to human, murine and bovine IL4R. The equine IL4R exhibits many conserved features when compared to other species, including intron-exon boundary positions and amino acid sequence motifs characteristic of type I cytokine receptors. The IL4R gene was localized to horse chromosome ECA13 by synteny mapping on a somatic cell hybrid panel. Evidence for an alternative splice variant of IL4R was found in the genomic sequence and subsequently verified using RT-PCR on equine monocyte RNA. A polymorphism screen of the largest exon, homologous to exon 12 of the human IL4R gene, was performed using DNA from 60 horses of various breeds which yielded 11 coding-region single nucleotide polymorphisms (SNPs), 7 synonymous and 4 non-synonymous. Three of the four non-synonymous SNPs occur at high frequencies and are found very near a conserved tyrosine residue.
authors.affiliation: Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California at Davis, Davis, CA 95616, USA.
authors.forename: O D
authors.initials: OD
authors.lastname: Solberg
authors.forename: K A
authors.initials: KA
authors.lastname: Jackson
authors.forename: L V
authors.initials: LV
authors.lastname: Millon
authors.forename: J L
authors.initials: JL
authors.lastname: Stott
authors.forename: M L
authors.initials: ML
authors.lastname: Vandenplas
authors.forename: J N
authors.initials: JN
authors.lastname: Moore
authors.forename: J L
authors.initials: JL
authors.lastname: Watson
mesh_terms: D017398:Alternative Splicing; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002874:Chromosome Mapping / Q000662:veterinary; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics; D006734:Horse Diseases / Q000235:genetics* / Q000276:immunology*; D006736:Horses / Q000235:genetics*; D006801:Humans; D008969:Molecular Sequence Data; D020641:Polymorphism, Single Nucleotide; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D019948:Receptors, Interleukin-4 / Q000235:genetics* / Q000276:immunology; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000662:veterinary; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA
chemical_list: D018076:DNA, Complementary; D012333:RNA, Messenger; D019948:Receptors, Interleukin-4