RGD uses the Human Disease Ontology (DO, https://disease-ontology.org/) for disease curation across species. RGD automatically downloads each new release of the ontology on a monthly basis. Some additional terms which are required for RGD's curation purposes but are not currently covered in the official version of DO have been added. As corresponding terms are added to DO, these custom terms are retired and the DO terms substituted in existing annotations and subsequently used for curation.
A nonphotosensitive trichothiodystrophy characterized by cysteine- and threonine-deficient hair that displays a diagnostic alternating light and dark 'tiger-tail' banding pattern under polarization microscopy, as well as ichthyosis that has_material_basis_in homozygous or compound heterozygous mutation in the TARS1 gene on chromosome 5p13.3. (DO)