title: Coding sequences of the MHC II beta chain of homozygous rainbow trout (Oncorhynchus mykiss).
abstract: Six lines of homozygous rainbow trout (Oncorhynchus mikiss) from different genetic and geographical backgrounds have been produced as aquatic models for biomedical research by the chromosome set manipulation techniques of androgenesis and gynogenesis. Messenger RNA from spleens was extracted. and the MHC II B cDNA sequences, amplified by RT PCR, were cloned into plasmids. Sequences of the MHC II beta2 domains were highly conserved between the different plasmids from the same and different lines of trout. Most of the variability among sequences was found in the amino terminal half of the beta1 domain, which corresponds with the peptide binding region of the MHC II molecule. This diversity suggests that the different lines of trout may exhibit differences in immune response. Rainbow trout MHC II B sequences were similar to the MHC II B sequences of the Pacific salmon (O. gorbuscha, O. tshawytscha, O. nerka, O. miasou, O. kisutch). Southern blot analysis performed on the restricted DNA of the OSU and Hot Creek trout, and the doubled haploid progeny produced by androgenesis from OSU x Hot Creek hybrids indicates that two distinct genes encode the MHC II B sequences and that these genes are unlinked.
authors.affiliation: Department of Animal Sciences, Washington State University, Pullman 99164-6351, USA. ristow@wsu.edu
authors.forename: S S
authors.initials: SS
authors.lastname: Ristow
authors.forename: L D
authors.initials: LD
authors.lastname: Grabowski
authors.forename: S M
authors.initials: SM
authors.lastname: Thompson
authors.forename: G W
authors.initials: GW
authors.lastname: Warr
authors.forename: S L
authors.initials: SL
authors.lastname: Kaattari
authors.forename: J M
authors.initials: JM
authors.lastname: de Avila
authors.forename: G H
authors.initials: GH
authors.lastname: Thorgaard
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D015139:Blotting, Southern; D000949:Histocompatibility Antigens Class II / Q000235:genetics*; D006720:Homozygote; D008969:Molecular Sequence Data; D017686:Oncorhynchus mykiss / Q000235:genetics*; D010802:Phylogeny; D012150:Polymorphism, Restriction Fragment Length
chemical_list: D000949:Histocompatibility Antigens Class II