Abstract:
:Stable cell surface presentation of HLA class I molecules requires active transport of antigenic peptides across the endoplasmic reticulum by products of two genes, TAP1 and TAP2, which map in the major histocompatibility complex class II region. Alleles of each gene are derived from a combination of variable sites at each locus. In this study, TAP1 and TAP2 alleles were identified in homozygous typing cell (HTC) lines, allowing resolution of specific haplotypes in conjunction with the highly polymorphic HLA class II region haplotypes. Three alleles at each TAP locus were found from which eight haplotypes could be assigned. Determination of TAP1 and TAP2 alleles in cell lines homozygous at DR, DQ, and DP created eight additional haplotypes beyond the number observed with these class II genes alone. Complete analysis of DR, DQ, TAP, and DP genotypes in 66 HTCs resulted in the following groups: 1) 46 homozygotes; 2) nine homozygous at DR, DQ, and TAP, but heterozygous at DP; 3) four homozygous at DR, DQ, and DP, but heterozygous at one or both TAP genes; 4) four homozygous at DR and DQ, but heterozygous at TAP and DP; and 5) three complex genotypes heterozygous at DP, TAP, and at least one of DQA1, DQB1, or DRB1 loci. TAP1 and TAP2 genes map in an area of frequent recombination. TAP alleles were determined in five DQB1, DPB1 recombinant individuals, three of which were informative. Recombination was found between DQB1 and the TAP loci in two individuals and between TAP and DPB1 in the other individual.
journal_name
Immunogeneticsjournal_title
Immunogeneticsauthors
Carrington M,Colonna M,Spies T,Stephens JC,Mann DLdoi
10.1007/BF00187452subject
Has Abstractpub_date
1993-01-01 00:00:00pages
266-73issue
4eissn
0093-7711issn
1432-1211journal_volume
37pub_type
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