Abstract
Deficient DNA mismatch repair results in microsatellite instability and might induce shifts of translational reading frames of genes encompassing coding microsatellites. These may be translated in truncated proteins, including neo-peptide tails functioning as tumor rejection antigens, when presented in the context of MHC class I. Recently, others and we identified a frameshift mutation in the coding T(10) microsatellite of the O-linked N-acetylglucosamine transferase gene (OGT) occuring in up to 41% of microsatellite unstable colorectal cancers. Here we describe a novel HLA-A0201-restricted cytotoxic T lymphocyte (CTL)-epitope (28-SLYKFSPFPL; FSP06) derived from this mutant OGT-protein. FSP06-specific CTL-clones killed peptide-sensitized target cells and tumor cell lines expressing both HLA-A0201 and mutant OGT proteins. This demonstrates that FSP06 is endogenously expressed and represents a CD8+-T cell epitope. Our data corroborate the concept of frameshift peptides constituting a novel subset of tumor-associated antigens specifically encountered in cancer cells with deficient mismatch repair.
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Ripberger, E., Linnebacher, M., Schwitalle, Y. et al. Identification of an HLA-A0201-Restricted CTL Epitope Generated by a Tumor-Specific Frameshift Mutation in a Coding Microsatellite of the OGT Gene. J Clin Immunol 23, 415–423 (2003). https://doi.org/10.1023/A:1025329819121
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DOI: https://doi.org/10.1023/A:1025329819121