Abstract：
:The HLA-DR4 subtypes Dw14 and Dw4 are T-cell-defined allospecificities encoded by the DRB1*0404 and DRB1*0401 genes, respectively. Although these allelic subtypes differ in only two amino acids, allorecognition between Dw14 and Dw4-positive individuals is brisk. This provides an opportunity to analyze T-cell receptor (TCR) usage in a very limited and specifically targeted case, namely the Dw4 anti-Dw14 allogeneic T-cell response. The variable (V), diversity (D), and joining (J) region sequences of the TCR beta chain from two different Dw14-specific alloreactive T-cell clones derived from a Dw4 donor were examined. Clone EMO25 recognized the Dw14.1, Dw14.2, and Dw15 subtypes, which share a DRB1 polymorphism at codon 71 on a DR4 background, while clone EMO36 reacted with only the Dw14.1 subtype associated with polymorphisms at codons 71 and 86. TCR beta cDNA from each clone was amplified using an anchored polymerase chain reaction (PCR) and subsequently expanded with V beta- and C beta-specific primers for asymmetric PCR and direct DNA sequencing. Both clones were found to express the same TCR V beta 8.2 gene segment; however, they have several different residues within the V beta-D beta-J beta junctional regions. V beta 8 usage was also enriched in polyclonal cells obtained from mixed lymphocyte cultures performed between the Dw4 and Dw14 responder-stimulator combination from which EMO25 and EMO36 were derived.
journal_name
Hum Immunoljournal_title
Human immunologyauthors
Yamanaka K,Kwok WW,Mickelson EM,Masewicz S,Nepom GTdoi
10.1016/0198-8859(92)90052-osubject
Has Abstractpub_date
1992-01-01 00:00:00pages
57-64issue
1eissn
0198-8859issn
1879-1166pii
0198-8859(92)90052-Ojournal_volume
33pub_type
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