title: The origin of HLA-DR"Br": exon 2 nucleotide sequence implicates possible gene conversion of DR1 by DR4-Dw10, DR5, or DRw6-Dw18.
abstract: The exon 2 nucleotide sequences of HLA-DQwl-associated and DQw3-associated HLA-DR"Br" alleles were determined from genomic DNA amplified by the Taq polymerase chain reaction technique. Both alleles reveal identical exon 2 nucleotide sequences. Comparison with other DR alleles suggests that DR"Br" may have originated from DR1 by gene conversion with DR4-Dw10, DR5, or DRw6-Dw18 third hypervariable region sequences.
authors.affiliation: United Kingdom Transplant Service, Bristol, England.
authors.forename: J L
authors.initials: JL
authors.lastname: Bidwell
authors.forename: E A
authors.initials: EA
authors.lastname: Bidwell
authors.forename: D M
authors.initials: DM
authors.lastname: Sansom
authors.forename: P T
authors.initials: PT
authors.lastname: Klouda
authors.forename: B A
authors.initials: BA
authors.lastname: Bradley
mesh_terms: D001483:Base Sequence; D002460:Cell Line; D003001:Cloning, Molecular; D004247:DNA; D004259:DNA-Directed DNA Polymerase; D005091:Exons; D005785:Gene Conversion; D006684:HLA-DR Antigens / Q000235:genetics*; D006801:Humans; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length
chemical_list: D006684:HLA-DR Antigens; D004247:DNA; D004259:DNA-Directed DNA Polymerase