Type : Other, mainly phenotypes with suspected mendelian basis;
Description : Persistent polyclonal B-cell lymphocytosis is an autosomal dominant condition characterized
by onset in infancy of splenomegaly and polyclonal expansion of B cells, resulting
in peripheral lymphocytosis. Affected individuals also show mild immune dysfunction,
including some defective antibody responses and T-cell anergy. There may be a predisposition
to the development of B-cell malignancy (summary by Snow et al., 2012).;