For example, the reported genetic variants include homozygous LOF alleles in AHI1, C12orf57 and POMGNT1 genes, which are known to underlie the severe neurological disorders, Joubert syndrome39, Temtamy syndrome40 and muscle–eye–brain disease and other muscular dystrophy–dystroglycanopathies,41 respectively. The gene discussed is C12orf57; the disease is muscular dystrophy.