Tietz syndrome
[3] It is caused by a mutation in the microphthalmia-associated transcription factor (MITF) gene.Individuals with Tietz syndrome often have skin and hair color that is lighter than those of other family members.The changes to these cells are generally detectable only by an eye examination; it is unclear whether the changes affect vision.[6] Tietz syndrome is caused by mutations in the MITF gene, located on human chromosome 3p14.1-p12.3.Other abnormalities (neurological, structural, Hirschsprung's disease) associated with the syndrome are treated symptomatically.