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Ludwig Institute for Cancer Research, Brussels Branch, and Unité de Génétique Cellulaire, Université Catholique de Louvain, Brussels, Belgium
A CTL clone that recognizes autologous tumor cells was previously isolated from the blood of a head-and-neck cancer patient. The Ag was identified as peptide FPSDSWCYF presented by autologous HLA-B*3503 molecules. This peptide was encoded by a mutated CASP-8 gene, which is implicated in the triggering of apoptosis. Here, we show that this CTL clone, which expresses a single TCR, also recognizes two unrelated peptides on allogeneic HLA-B*3501 molecules. One peptide, HIPDVITY, is encoded by squalene synthase, and the other one, QFADVIVLF, is encoded by 2-hydroxyphytanoyl-CoA lyase. Both genes are expressed ubiquitously. These antigenic peptides are processed and presented by HLA-B*3501 cells. The two HLA-B35 alleles are closely related. Our results might reinforce the notion that the recognition of allogeneic HLA molecules depends on the presence in their groove of a limited number of peptides processed from ubiquitous proteins.
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