- Smith-McCort dysplasia 1 [DOID:0081270]
A Smith-McCort dysplasia that is characterized by short limbs and a short trunk with a barrel-shaped chest and has_material_basis_in homozygous or compound heterozygous mutation in the DYM gene (607461) on chromosome 18q21.
- Smith-McCort dysplasia 2 [DOID:0081271]
A Smith-McCort dysplasia that is characterized by short trunk dwarfism with a barrel-shaped chest, rhizomelic limb shortening and that has_material_basis_in homozygous or compound heterozygous mutation in the RAB33B gene on chromosome 4q31.
- 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.
- X-linked mental retardation-hypotonic facies syndrome-1 [DOID:0080982]
A syndromic X-linked intellectual disability that is characterized primarily by severe mental retardation, dysmorphic facies, and a highly skewed X-inactivation pattern in carrier women and that has_material_basis_in mutation in the ATRX gene. X-linked mental retardation-hypotonic facies syndrome comprises several syndromes previously reported separately. These include Carpenter-Waziri, Holmes-Gang, and Smith-Fineman-Myers syndromes. X-linked alpha-thalassemia/mental retardation syndrome is an allelic disorder with a similar phenotype with the addition of alpha-thalassemia and Hb H inclusion bodies in erythrocytes.