A tiny slip in the vaccine's script — and scientists now know how to write it out

Messenger RNA vaccines carry instructions that our cells read to build a protective protein — but one common ingredient can make the reading machinery slip by a single letter, producing garbled copies. A team led by Panagiotis Poulis and Marina Rodnina has pinpointed exactly which letter sequences cause the slip, and shown that swapping a single letter removes it almost entirely, without changing the protein. Published in Nature Communications, the rule set could make future mRNA vaccines and cancer therapies cleaner and more precise.