Griscelli syndrome type 1 (GS1) is caused by mutations of MYO5A and hypomelanosis is accompanied by neurologic deficits [19], while Griscelli syndrome type 2 (GS2) is caused by RAB27A mutations and patients show immune impairment in combination with the hair color dilution [20]. The gene discussed is MYO5A; the disease is Griscelli disease.