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• W3208292276 abstract "Abstract High-affinity MHC I-peptide interactions are considered essential for immunogenicity. However, some neo-epitopes with low affinity for MHC I have been reported to elicit CD8 T cell dependent tumor rejection in immunization-challenge studies. Here we show in a mouse model that a neo-epitope that poorly binds to MHC I is able to enhance the immunogenicity of a tumor in the absence of immunization. Fibrosarcoma cells with a naturally occurring mutation are edited to their wild type counterpart; the mutation is then re-introduced in order to obtain a cell line that is genetically identical to the wild type except for the neo-epitope-encoding mutation. Upon transplantation into syngeneic mice, all three cell lines form tumors that are infiltrated with activated T cells. However, lymphocytes from the two tumors that harbor the mutation show significantly stronger transcriptional signatures of cytotoxicity and TCR engagement, and induce greater breadth of TCR reactivity than those of the wild type tumors. Structural modeling of the neo-epitope peptide/MHC I pairs suggests increased hydrophobicity of the neo-epitope surface, consistent with higher TCR reactivity. These results confirm the in vivo immunogenicity of low affinity or ‘non-binding’ epitopes that do not follow the canonical concept of MHC I-peptide recognition." @default.
• W3208292276 created "2021-11-08" @default.
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• W3208292276 date "2021-11-05" @default.
• W3208292276 modified "2023-10-17" @default.
• W3208292276 title "Reversion analysis reveals the in vivo immunogenicity of a poorly MHC I-binding cancer neoepitope" @default.
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• W3208292276 doi "https://doi.org/10.1038/s41467-021-26646-5" @default.
• W3208292276 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8571378" @default.
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