title: Class II MHC cDNAs in 15I5 B-congenic chickens.
abstract: cDNA was obtained from the bursae of Fabricius of chickens from six B-congenic lines developed at this laboratory and studied for expression of class II B-LB genes. Following cDNA amplification, cloning and sequencing, genes were assigned to B-LB loci based on characteristic DNA sequences, amino acid relatedness to characterized genes, and level of expression. Genes from the B-LBI, B-LBII, and B-LBVI loci were differentially expressed in chickens with the B2, B5, B13, B15, or B21 haplotypes. Chickens of all haplotypes expressed a B-LBII gene. Additional B-LB genes expressed included: B-LBI genes in the B5 and B19 haplotypes; a B-LBI/VI recombinant gene in the B2 haplotype; and a B-LBVI gene in the B13 haplotype. The B-congenic lines have demonstrable differences in resistance to Marek's disease (MD), and in responses to MD viral vaccines. This variability in disease resistance may be correlated with polymorphisms in the expressed B-LB genes, or with differential expression of genes at different loci.
authors.affiliation: U.S. Department of Agriculture, Agricultural Research Service, Avian Disease and Oncology Laboratory, 3606 East Mount Hope Road, East Lansing, MI 48823, USA.
authors.forename: G T
authors.initials: GT
authors.lastname: Pharr
authors.forename: J B
authors.initials: JB
authors.lastname: Dodgson
authors.forename: H D
authors.initials: HD
authors.lastname: Hunt
authors.forename: L D
authors.initials: LD
authors.lastname: Bacon
mesh_terms: D000818:Animals; D020296:Animals, Congenic; D001483:Base Sequence; D002645:Chickens / Q000235:genetics* / Q000276:immunology*; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics; D005802:Genes, MHC Class II / Q000235:genetics* / Q000276:immunology; D020022:Genetic Predisposition to Disease / Q000235:genetics; D006239:Haplotypes / Q000235:genetics; D008380:Marek Disease / Q000235:genetics / Q000276:immunology; D008969:Molecular Sequence Data; D011110:Polymorphism, Genetic / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment; D014765:Viral Vaccines / Q000276:immunology
chemical_list: D018076:DNA, Complementary; D014765:Viral Vaccines