Identification of two major HLA-B44 subtypes and a novel B44 sequence (B*4404). Oligotyping and solid phase sequencing of polymerase chain reaction products.

Abstract:

:PCR-based analyses were performed for the identification of HLA-B44 subgroups. Genomic DNA from six homozygous cell lines and 44 healthy individuals who had serologically tested positive for HLA-B44 was investigated for polymorphism in exons 2 and 3 of the HLA-B44 genes. Two primers were designed for specific amplification of the B*4401 allele in exon 2. None of the tested genomic DNAs, including the cell line "BAU-J" from which the sequence of B*4401 was derived, was amplified successfully using these primers, indicating that the B*4401 sequence may not be correct in position 242-244. For identification of the B*4402 and *4403 subtypes we specifically amplified the B44 gene in exon 3 using two sequence-specific primers. The PCR products, which were obtained from all B44-positive samples (n = 50) and from none of the B44-negative controls (n = 20), were subsequently hybridized with the dig-ddUTP-labeled oligonucleotides. The base substitution at position 146, as described previously for B*4401 and *4402 (C for G), could not be confirmed by oligonucleotide hybridization. In contrast, the oligonucleotide typing for G in position 146 gave positive signals in all B44-positive samples. Except for one, HLA-B44-positive DNAs from LCLs and healthy individuals could be divided into two subgroups according to the polymorphic region in position 195-197. Out of 44 unrelated individuals with B44, 27 (61%) were positive for B*4402 and 16 (36%) were positive for B*4403.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Hum Immunol

journal_title

Human immunology

authors

Yao Z,Keller E,Scholz S,McNicholas A,Volgger A,Albert ED

doi

10.1016/0198-8859(94)00071-w

subject

Has Abstract

pub_date

1995-01-01 00:00:00

pages

54-60

issue

1

eissn

0198-8859

issn

1879-1166

pii

019888599400071W

journal_volume

42

pub_type

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