Immunodeficiency-11A is an autosomal recessive primary immunodeficiency characterized by normal numbers of T and B lymphocytes, but defective intracellular signaling. There is a block in B-cell differentiation with increased numbers of transitional B cells and hypogammaglobulinemia, as well as decreased numbers of regulatory T cells and defects in T-cell function (summary by Greil et al., 2013 and Stepensky et al., 2013). [from
OMIM]