Since 2020, most of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) evolution has been focused on the receptor-binding domain (RBD) of the Spike protein. Nevertheless, the N-terminal domain (NTD) of Spike has been shown to represent the target for neutralizing antibodies, and accordingly, NTD mutations are relevant for immune escape. In 2024, after the introduction of the BA.2.86 saltation variant (heavily mutated at the NTD antigenic supersite), its descendant JN.1 has further explored NTD evolution in its progeny, largely focused on positions 22, 31, 59 and 60. In this review, we explore such convergent evolution in detail and hypothesize the underlying mechanisms.

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variant of interest BA.2.87.1 has not driven any Coronavirus disease 2019 (COVID-19) pandemic wave. Nevertheless, it has served to test the reaction times of modern virology laboratories. In this commentary, we highlight how fast the reaction has been at characterizing this sublineage, leading at an unprecedented pace to almost as many papers as the number of viral sequences.