| Disease ID | Source | Name | Description |
| 618546 | OMIM | Trichothiodystrophy 7, non-photosensitive (TTD7) | A form of trichothiodystrophy, a disease characterized by sulfur-deficient brittle hair and multisystem variable abnormalities. The spectrum of clinical features varies from mild disease with only hair involvement to severe disease with cutaneous, neurologic and profound developmental defects. Ichthyosis, intellectual and developmental disabilities, decreased fertility, abnormal characteristics at birth, ocular abnormalities, short stature, and infections are common manifestations. There are both photosensitive and non-photosensitive forms of the disorder. TTD7 patients do not manifest cutaneous photosensitivity. They have cysteine- and threonine-deficient hair with alternating light and dark 'tiger-tail' banding pattern observed under polarization microscopy. Inheritance pattern is autosomal recessive. The disease is caused by variants affecting the gene represented in this entry. |