title: Polymorphism of sheep MHC Class IIb gene TAPASIN.
abstract: The Major Histocompatibility Complex (MHC) is one of the most gene dense regions in the genome and studies in several species have shown significant associations between the MHC and disease. The endoplasmic reticular glycoprotein, tapasin, is involved in the MHC class I antigen presentation pathway. Sheep TAPASIN is located in the class IIb region of the MHC. Sheep TAPASIN was subcloned from BAC and cosmid genomic clones and DNA sequenced. TAPASIN is 9549bp in length and encodes a protein of 447 amino acids. The structure of sheep TAPASIN was similar to other mammals and consisted of eight exons with a distinctively larger intron between exon three and four. Sheep TAPASIN gene had high sequence identity with other mammalian TAPASINs. The TAPASIN gene sequence is conserved across many mammalian species and is possibly maintained through purifying selection with the average ratio of ds/dn of 3.9. Twenty-six SNPs in sheep TAPASIN were identified.
authors.affiliation: Western Australian Biomedical Research Institute (WABRI) & Centre for Health Innovation Research Institute, School of Biomedical Sciences, Curtin University of Technology, Perth, Western Australia 6845, Australia.
authors.forename: N Siva
authors.initials: NS
authors.lastname: Subramaniam
authors.forename: E F
authors.initials: EF
authors.lastname: Morgan
authors.forename: C Y
authors.initials: CY
authors.lastname: Lee
authors.forename: J D
authors.initials: JD
authors.lastname: Wetherall
authors.forename: D M
authors.initials: DM
authors.lastname: Groth
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D026901:Membrane Transport Proteins / Q000737:chemistry / Q000235:genetics*; D008969:Molecular Sequence Data; D020641:Polymorphism, Single Nucleotide; D012756:Sheep / Q000276:immunology*
chemical_list: D026901:Membrane Transport Proteins; C107762:tapasin