EBV-driven Gate–License–Amplify circuit in multiple sclerosis pathogenesis

Abstract

Five recent publications establish a “ Gate – License – Amplify ” circuit that mechanistically links Epstein – Barr virus (EBV) infection and genetic risk (HLA-DR15) to the pathogenesis of multiple sclerosis (MS). 1 – 5 This new model reveals how EBV reprograms immuno-peptidomes to trigger CNS autoimmunity, providing a molecular rationale for the ef fi cacy of B-cell depletion and supporting EBV-directed prevention as a realistic goal. Imagine a virus, spread by a simple kiss, sparking a lifelong autoimmune siege in the brain — a longstanding enigma of EBV ’ s role in MS that is now illuminated by fresh evidence. MS has long suffered from an evidence asymmetry: genetics and epidemiology are crisp — HLA-DR15 as a dominant allele, EBV seroconversion preceding and sharply elevating risk — yet mechanisms have been fragmented (mimicry, bystander effects, immune dysregulation) or incomplete, lacking actionable steps linking EBV to CNS lesions. Historically, three routes dominated: genetic restriction (DR15 shapes self/viral peptide visibility), mimicry (EBV primes cross-reactive responses), and B-cell tropism (EBV infects B cells; anti-CD20 therapies succeed strikingly). However, why dose DR15 matter most? Why dose EBV, colloquially known as the “ kissing disease ” due to its primary transmission through saliva, stand out among ubiquitous viruses? And why are B cells clinically central? Recently, fi ve papers resolve these questions by showing that EBV reprograms B-cell immunopeptidomes