- Ehlers-Danlos syndrome classic type 2 [DOID:0080726]
An Ehlers-Danlos syndrome that has_material_basis_in heterozygous mutation in the collagen alpha-2(V) gene on chromosome 2q31 and that is characterized by the absence of widened atrophic scars.
- Ehlers-Danlos syndrome classic type 1 [DOID:14720]
An Ehlers-Danlos syndrome that is characterized by loose-jointedness and fragile, bruisable skin that heals with peculiar 'cigarette-paper' scars and that has_material_basis_in heterozygous mutation in the collagen alpha-1(V) gene (COL5A1) on chromosome 9q34.
- DNA ligase IV deficiency [DOID:0060021]
A combined T cell and B cell immunodeficiency that has_material_basis_in a mutation in the LIG4 gene, a DNA ligase, encoding a protein essential for V(D)J recombination and DNA double-strand break (DSB) repair through nonhomologous end joining (NHEJ). Patients present with immunodeficiency and developmental and growth delay.