Smith-McCort dysplasia 1

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

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.

X-linked mental retardation-hypotonic facies syndrome-1

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.