label: Activated PI3K Delta Syndrome 2
label_lc: activated pi3k delta syndrome 2
description: An autosomal dominant condition caused by mutation(s) in the PIK3R1 gene, encoding phosphatidylinositol 3-kinase regulatory subunit alpha. It is characterized by a heterogenous phenotype, including recurrent respiratory infections, lymphoproliferation, and antibody deficiency. There is an increased likelihood of development of B-cell lymphoma.