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Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Science 2020 ; 370 (6512): 89-94 Nephropedia Template TP
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Selective and cross-reactive SARS-CoV-2 T cell epitopes in unexposed humans #MMPMID32753554
Mateus J; Grifoni A; Tarke A; Sidney J; Ramirez SI; Dan JM; Burger ZC; Rawlings SA; Smith DM; Phillips E; Mallal S; Lammers M; Rubiro P; Quiambao L; Sutherland A; Yu ED; da Silva Antunes R; Greenbaum J; Frazier A; Markmann AJ; Premkumar L; de Silva A; Peters B; Crotty S; Sette A; Weiskopf D
Science 2020[Oct]; 370 (6512): 89-94 PMID32753554show ga
Many unknowns exist about human immune responses to the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) virus. SARS-CoV-2-reactive CD4(+) T cells have been reported in unexposed individuals, suggesting preexisting cross-reactive T cell memory in 20 to 50% of people. However, the source of those T cells has been speculative. Using human blood samples derived before the SARS-CoV-2 virus was discovered in 2019, we mapped 142 T cell epitopes across the SARS-CoV-2 genome to facilitate precise interrogation of the SARS-CoV-2-specific CD4(+) T cell repertoire. We demonstrate a range of preexisting memory CD4(+) T cells that are cross-reactive with comparable affinity to SARS-CoV-2 and the common cold coronaviruses human coronavirus (HCoV)-OC43, HCoV-229E, HCoV-NL63, and HCoV-HKU1. Thus, variegated T cell memory to coronaviruses that cause the common cold may underlie at least some of the extensive heterogeneity observed in coronavirus disease 2019 (COVID-19) disease.