title: [Characterization of novel alleles and new mutation sites of porcine MHC class II DQA].
abstract: The primers, DQAp161 and DQAp443, were designed based on the homologous region of SLA-DQA cDNA sequences and HLA-DQA genomic sequences. The 731 bp fragment of SLA-DQA including completed intron 2, the near completed exon 2 and partial exon 3 was obtained by PCR. The nucleotide sequences of the fragment of SLA-DQA were obtained with cloning and direct sequencing. Both nucleotide sequences of exon 2 and amino acid sequences of alpha 1 domain were analyzed in a pedigree. The sequence data were compared with all sequences of SLA-DQA exon 2 in GenBank. Two novel alleles, DQA-SLT 26 and DQA-TC 21-1, were found according to the above analyses. Four amino acid changes were observed among SLA-DQA haplotype c, d and DQA-SLT 26. They were Val-->Ala(60), Lys-->Glu(65), Asp-->Gly(81) and Lys-->Ile(93). Comparing the amino acids sequence of the all SLA-DQA sequences with DQA-TC 21-1 revealed that the His (94) was changed into Tyr.
authors.affiliation: Laboratory Of Molecular Biology and Animal Breeding, College of Animal Science & Technology, Huazhong Agricultural University, Wuhan 430070, China.
authors.forename: Bang
authors.initials: B
authors.lastname: Liu
authors.forename: Zheng-Mao
authors.initials: ZM
authors.lastname: Zhu
authors.forename: Mei
authors.initials: M
authors.lastname: Yu
authors.forename: Jian-Hua
authors.initials: JH
authors.lastname: Cao
authors.forename: Li
authors.initials: L
authors.lastname: Lin
authors.forename: Tong-An
authors.initials: TA
authors.lastname: Xiong
authors.forename: Meng-Jin
authors.initials: MJ
authors.lastname: Zhu
authors.forename: Zhong-Zhen
authors.initials: ZZ
authors.lastname: Peng
authors.forename: Kui
authors.initials: K
authors.lastname: Li
mesh_terms: D000483:Alleles; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D004247:DNA / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification; D004252:DNA Mutational Analysis; D006239:Haplotypes; D000949:Histocompatibility Antigens Class II / Q000235:genetics*; D008969:Molecular Sequence Data; D009154:Mutation; D020125:Mutation, Missense; D010802:Phylogeny; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid
chemical_list: D000949:Histocompatibility Antigens Class II; D004247:DNA