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  • Title: HLA-DPB1 typing by PCR-SSO reverse dot blot hybridization after group-specific amplification.
    Author: Blasczyk R, Mohr M, Zimmermann R, Schwella N, Huhn D.
    Journal: Infusionsther Transfusionsmed; 1994 Dec; 21(6):401-4. PubMed ID: 7873918.
    Abstract:
    BACKGROUND: The allelic diversity of HLA-DPB1 antigens can be determined at the DNA level after PCR amplification. The pattern of polymorphism at the DPB1 locus makes it difficult to unambiguously assign all genotypes in a typing system using one single pair of generic primers. MATERIALS AND METHODS: We apply here a simple technique based on the reverse dot blot analysis to the typing of HLA-DPB1 alleles. In order to increase its resolution, a group-specific amplification based on sequence variations of the polymorphic region F was used subdividing the HLA-DPB1 alleles in 2 nonoverlapping families. A separate analysis was then performed within each group of alleles. RESULTS: Using these 2 primer pairs, 21 group 1 and 30 group 2 alleles were separately amplified. From 1,378 possible allele combinations for DPB1*0101-5301 only 33 gave ambiguous typing results compared to 61 using a single pair of generic primers. CONCLUSIONS: This procedure provides a rapid and simple HLA-DPB1 genotyping. Especially in heterozygotes the hybridization patterns were easier to interpret. The utilization of group-specific amplification substantially reduced ambiguous typing results.
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