MedGen

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]

The cutaneous and occasional systemic reactions associated with vaccination using smallpox (variola) vaccine. [from MONDO]

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]