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• W4311325045 abstract "CD4+ T cells are essential for protection against viruses, including SARS-CoV-2. The sensitivity of CD4+ T cells to mutations in SARS-CoV-2 variants of concern (VOCs) is poorly understood. Here, we isolated 159 SARS-CoV-2-specific CD4+ T cell clones from healthcare workers previously infected with wild-type SARS-CoV-2 (D614G) and defined 21 epitopes in spike, membrane and nucleoprotein. Lack of CD4+ T cell cross-reactivity between SARS-CoV-2 and endemic beta-coronaviruses suggested these responses arose from naïve rather than pre-existing cross-reactive coronavirus-specific T cells. Of the 17 epitopes located in the spike protein, 10 were mutated in VOCs and CD4+ T cell clone recognition of 7 of them was impaired, including 3 of the 4 epitopes mutated in omicron. Our results indicated that broad targeting of epitopes by CD4+ T cells likely limits evasion by current VOCs. However, continued genomic surveillance is vital to identify new mutations able to evade CD4+ T cell immunity. Based on the identification of CD4+ T cell clones specific for distinct epitopes in the SARS-CoV-2 proteins, Long and colleagues characterize how mutations in these epitopes lead to loss of recognition by the CD4+ T cells elicited by natural infection or vaccination." @default.
• W4311325045 created "2022-12-25" @default.
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• W4311325045 date "2022-12-01" @default.
• W4311325045 modified "2023-10-14" @default.
• W4311325045 title "Mutations in SARS-CoV-2 spike protein impair epitope-specific CD4+ T cell recognition" @default.
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• W4311325045 doi "https://doi.org/10.1038/s41590-022-01351-7" @default.
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