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Am J Clin Pathol ; 122(2): 185-92, 2004 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-15323134

RESUMO

From an unusually informative family of 8 with near identical parental haplotypes (a and c), which differed by a single nucleotide substitution, we identified a new HLA-A1 null variant. While serologic antigen typing initially showed a "blank" allele in maternal haplotype "c" and 2 male offspring, more sophisticated DNA molecular HLA typing subsequently revealed the presence of a novel HLA-A0101 allele. Sequence-based typing showed a point mutation consisting of a nucleotide substitution of a cytosine for a guanine at nucleotide 215 yielding an amino acid change of arginine to proline at codon 48 in exon 2 (R48P). The impact on the HLA and immunogenetics laboratory is the need to not assume that all blanks are homozygous, as well as the need for the availability of high-resolution DNA molecular typing to clarify new alleles and to detect HLA-A null variants.


Assuntos
Alelos , Antígeno HLA-A1/genética , Mutação Puntual , Sequência de Aminoácidos , Sequência de Bases , Primers do DNA , Feminino , Haplótipos , Humanos , Masculino , Dados de Sequência Molecular , Linhagem , Reação em Cadeia da Polimerase
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