MedGen

The WAS-related disorders, which include Wiskott-Aldrich syndrome, X-linked thrombocytopenia (XLT), and X-linked congenital neutropenia (XLN), are a spectrum of disorders of hematopoietic cells, with predominant defects of platelets and lymphocytes caused by pathogenic variants in WAS. WAS-related disorders usually present in infancy. Affected males have thrombocytopenia with intermittent mucosal bleeding, bloody diarrhea, and intermittent or chronic petechiae and purpura; eczema; and recurrent bacterial and viral infections, particularly of the ear. At least 40% of those who survive the early complications develop one or more autoimmune conditions including hemolytic anemia, immune thrombocytopenic purpura, immune-mediated neutropenia, rheumatoid arthritis, vasculitis, and immune-mediated damage to the kidneys and liver. Individuals with a WAS-related disorder, particularly those who have been exposed to Epstein-Barr virus (EBV), are at increased risk of developing lymphomas, which often occur in unusual, extranodal locations including the brain, lung, or gastrointestinal tract. Males with XLT have thrombocytopenia with small platelets; other complications of Wiskott-Aldrich syndrome, including eczema and immune dysfunction, are usually mild or absent. Males with XLN have congenital neutropenia, myeloid dysplasia, and lymphoid cell abnormalities. [from GeneReviews]

Intellectual disability, previously referred to as mental retardation, is characterized by subnormal intellectual functioning that occurs during the developmental period. It is defined by an IQ score below 70. [from HPO]

An X-linked intellectual deficiency in which not enough information is known, reported or published to indicate whether a gene causes non-syndromic or syndromic presentations. [from MONDO]

An increased concentration of cholesterol in the blood. [from HPO]

A mode of inheritance that is observed for traits related to a gene encoded on the X chromosome. [from HPO]

An decreased concentration of low-density lipoprotein cholesterol in the blood. [from HPO]

A group of skin disorders including Stevens-Johnson syndrome/toxic epidermal necrolysis (SJS/TEN), drug reaction with eosinophilia and systemic symptoms (DRESS), acute generalized exanthematous pustulosis (AGEP), and generalized bullous fixed drug eruptions (GBFDE). [from MONDO]

An elevated lipid concentration in the blood. [from HPO]

An inherited metabolic disorder caused by an enzyme deficiency, resulting in an inability to oxidize fatty acids for energy production. [from NCI]

X-linked intellectual disability-craniofacioskeletal syndrome is a rare, hereditary, syndromic intellectual disability characterized by craniofacial and skeletal abnormalities in association with mild intellectual disability in females and early postnatal lethality in males. In addition to mild cognitive impairment, females present with microcephaly, short stature, skeletal features and extra temporal lobe gyrus. In males, intrauterine growth impairment, cardiac and urogenital anomalies have been reported. [from ORDO]

Claes-Jensen type of X-linked syndromic intellectual developmental disorder (MRXSCJ) is characterized by impaired intellectual development with substantial clinical heterogeneity in affected males. However, males are usually reported to have short stature, microcephaly, hyperreflexia, and aggressive behavior. In rare cases, female carriers exhibit mildly impaired intellectual development or learning difficulties (summary by Guerra et al., 2020). [from OMIM]

This syndrome has characteristics of severe intellectual deficit, brachycephaly, plagiocephaly, prominent forehead and coarse facial features. It has been described in two males from one family. Two females belonging to the same family displayed moderate intellectual deficit but no craniofacial dysmorphism. [from SNOMEDCT_US]

The Nascimento type of X-linked syndromic intellectual developmental disorder (MRXSN) is characterized by dysmorphic features, including large head, synophrys, prominent supraorbital ridges, almond-shaped and deep-set eyes, large ears, wide mouth, myxedematous appearance, hirsutism, abnormal hair whorls, micropenis, and onychodystrophy. Female carriers have normal cognition, but may show subtle facial features (summary by Budny et al., 2010). [from OMIM]

Wiskott-Aldrich syndrome-2 (WAS2) is an autosomal recessive immunologic disorder characterized by onset of recurrent infections in infancy. Other features include thrombocytopenia with normal platelet volume and eczema. Laboratory studies show decreased CD8+ T cells, variably increased Ig, particularly IgE, low B cells, aberrant function of T and NK cells, and impaired T-cell migration. The cellular abnormalities are thought to result from defective F-actin polymerization. Death in early childhood may occur; hematopoietic stem cell transplantation is curative (summary by Lanzi et al., 2012). For a discussion of genetic heterogeneity of Wiskott-Aldrich syndrome, see WAS (301000). [from OMIM]

An increase in the amount of very-low-density lipoprotein cholesterol in the blood. [from HPO]

A reduction in the amount of very-low-density lipoprotein cholesterol in the blood. [from HPO]

X-linked intellectual developmental disorder-108 (MRX108) is characterized by early hypotonia, global developmental delay, and moderately to severely impaired intellectual development. Brisk tendon reflexes, variable facial dysmorphism, and fifth finger clinodactyly may be present (Khayat et al., 2019). [from OMIM]

X-linked intellectual disability-cubitus valgus-dysmorphism syndrome is characterised by moderate intellectual deficit, marked <i>cubitus valgus</i>, mild microcephaly, a short philtrum, deep-set eyes, downslanting palpebral fissures and multiple nevi. Less than ten individuals have been described so far. Transmission is thought to be X-linked recessive. [from ORDO]

A inherited lipid metabolism disorder that is part of a larger syndrome. [from MONDO]