title: [Identifying and sequence analysis of HLA-B*2736].
abstract: An unknown HLA-B allele which was similar to HLA-B*270401 was detected by FLOW-SSOPCR-SSP and heterozygous sequence-based typing (SBT) in Chinese Han individual. Its anomalous patterns suggested the possible presence of new allele. Amplifying exon 2-5(include intron 2-4) of the HLA-B*27 allele separately by using allele-specific primers and sequencing in both directions. Identifying the difference between the novel B*27 allele and B*270401. The sequence of novel B*27 from exon 2 to partial exon 5 is 1 815 bp. There are 10 nt changes from B*270401 in exon 3-4, at nt634where A-->C(codon130 AGC-->CGC, 130 S-->R); nt670 where A-->T (codon142 ACC-->TCC, 142 T-->S); nt683 where G-->T (codon146 TGG-->TTG, 146 W-->L); nt698 where A-->T (codon151 GAG-->GTG, 151 E-->V); nt774 where G-->C (codon176 GAG-->GAC, 176 E-->D); nt776 where C-->A (codon177 ACG-->AAG, 177 T-->K); nt781 where C-->G (codon179 CAG-->GAG, 179Q-->E); nt789 where G-->T (codon181 GCG-->GCT) resulting no coding change; nt1438 where C-->T (codon206 GGC-->GGT) resulting no coding change; nt1449 where G-->C (codon210 GGG-->GCG, 210G-->A). In IMGT/HLA database, only three alleles (B*270502/2706/2732) have sequences of introns. The same sequence in intron 2 showed homology between the novel HLA-B*27 allele and B*2706, but their homology could not be supported in intron 3-4. Comparing the sequence of the novel B*27 allele in intron 3 and 4 with B*27 group, it showed there are three mutations at nt106 C-->G, nt179 G-->A, nt536 G-->A and one deletion at nt168 in intron 3 and one mutations at nt82 T-->C in intron 4, but the sequence of the novel B*27 allele in intron 3 and 4 was all the same to B*070201. The sequence was submitted to Gen-Bank and the accession number was DQ915176. The allele has been confirmed as an extension of B*2736 by the WHO Nomenclature committee in November 2006.
authors.affiliation: Shenzhen Institute of Transfusion Medicine, Shenzhen Blood Center, Shenzhen 518035, China. shallylizhen@yahoo.com.cn
authors.forename: Zhen
authors.initials: Z
authors.lastname: Li
authors.forename: Hong-Yan
authors.initials: HY
authors.lastname: Zou
authors.forename: Chao-Peng
authors.initials: CP
authors.lastname: Shao
authors.forename: Si
authors.initials: S
authors.lastname: Tang
authors.forename: Da-Ming
authors.initials: DM
authors.lastname: Wang
authors.forename: Liang-Hong
authors.initials: LH
authors.lastname: Cheng
mesh_terms: D000483:Alleles; D044466:Asian People / Q000208:ethnology / Q000235:genetics*; D001483:Base Sequence; D005091:Exons / Q000235:genetics; D015235:HLA-B Antigens / Q000145:classification / Q000235:genetics* / Q000302:isolation & purification*; D006801:Humans; D007438:Introns / Q000235:genetics; D008297:Male; D008969:Molecular Sequence Data; D016415:Sequence Alignment; D017421:Sequence Analysis; D017422:Sequence Analysis, DNA
chemical_list: D015235:HLA-B Antigens