However, intronic FGF14 (GAA)≥250 repeat expansions, known to cause spinocerebellar ataxia 27B/GAA-FGF14 disease [2, 3], were lately shown to account for almost 50% of previously unexplained DBN cases [4], suggesting that monogenic causes may be a recurrent cause of what has so far been considered “idiopathic” DBN. Here, FGF14 is linked to cerebellar ataxia.