We comment on the study by Mulroney et al.(1) entitled: “N1-methylpseudouridylation of mRNA causes +1 ribosomal frameshifting.” The study found evidence in mice and humans for the misreading of the modRNA contained within the Pfizer COVID-19 vaccine to inadvertently produce “off-target” proteins capable of eliciting “off-target” immune responses. The authors propose that these novel proteins are the result of ribosomal frameshifting occasioned by the substitution of N1-methyl pseudouridine. The authors state that the “error prone” code is a safety concern with a “huge potential to be harmful” and that “it is essential that these therapeutics are designed to be free from unintended side-effects.”

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