MHC class II deficiency-5 (MHC2D5) is an autosomal recessive disorder characterized by defective cell surface expression of class II HLA molecules on the surface of peripheral blood B cells, monocytes, and activated T cells. Affected individuals may present in infancy with recurrent infections and hypogammaglobulinemia, but patients do not develop severe infections, as observed in other forms of MHC class II deficiency. Some individuals may be asymptomatic (Wolf et al., 1995).
For a discussion of genetic heterogeneity of MHC class II deficiency, see MHC2D1 (209920). [from
OMIM]