| Phenotype details |
delayed motor development, delayed language skills; 1y-vertical nystagmus, upper limb tremor; 2y-severe ataxia, inability to walk/sit unaided, triggered by febrile illness, regained previous neurological status after 1w, episodes recurred twice a year; 6.3y-nystagmus, discrete upper limb postural/action tremor, coordination difficulties, mild learning difficulties, benefited from language rehabilitation; very smiley, communicative with peers |