Biallelic variants in RNU2-2 cause the most prevalent known recessive neurodevelopmental disorder. - Greene D; Mendez R; Lees J; Barbosa M; Bruselles A; Chiriatti L; Ferraro F; Mancini C; Schot R; Sleutels F; Bertini E; Bonner DE; et al. (Nature genetics, 2026)