porphyria cutanea tarda

An acute porphyria characterized by painful, blistering skin lesions that develop on sun-exposed skin.

Bloom syndrome

A syndrome characterized by sun sensitivity, short stature, predisposition to the development of cancer and genomic instability.

Cockayne syndrome B

A Cockayne syndrome that is characterized by severe physical and mental retardation, microcephaly, progressive neurologic and retinal degeneration, skeletal abnormalities, gait defects, and sun sensitivity with no increased frequency of cancer, and that has_material_basis_in homozygous or compound heterozygous mutation in the gene encoding the group 6 excision repair cross-complementing protein on chromosome 10q11.

immunodeficiency 23

A combined T cell and B cells immunodeficiency characterized by marked atopy and autoimmunity caused by increased T(H)2 and T(H)17 cytokine production by CD4(+) T cells, T-cell lymphopenia, reduced memory B-cell numbers, recurrent respiratory and skin infections beginning in early childhood, increased serum IgE, and variable developmental delay or intellectual impairment that has_material_basis_in homozygous or compound heterozygous mutation in the PGM3 gene on chromosome 6q14.1.

histiocytosis-lymphadenopathy plus syndrome

A syndrome characterized by histiocytosis, hyperpigmentation, hypertrichosis, hepatosplenomegaly, heart anomalies, hearing loss, hypogonadism, and reduced height that has_material_basis_in homozygous or compound heterozygous mutation in SLC29A3 on 10q22.1. This syndrome comprises features from 4 histiocytic disorders that were previously considered distinct: Faisalabad histiocytosis, sinus histiocytosis with massive lymphadenopathy, H syndrome, and pigmented hypertrichosis with insulin-dependent diabetes mellitus syndrome.

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.