GPSM2 and Cerebellar dysplasia: Mutations in Gpsm2 cause the human disease Chudley‐McCullough syndrome (Shahin et al. 2010; Walsh et al. 2010; Doherty et al. 2012), a developmental disorder characterized by sensorineural deafness and a particular set of brain anomalies (agenesis of the corpus callosum, cerebellar dysplasia, and nodular heterotopia).