ADGRG1 and neuromuscular disease caused by qualitative or quantitative defects of alpha-dystroglycan: Global cerebellar dysplasia has been reported in a few posterior fossa malformations including Chudley-McCullough syndrome [29], α-dystroglycanopathies [30], GPR56-related polymicrogyria [31], and Poretti-Boltshauser syndrome due to LAMA1 mutations [32, 33].