NCIt definition : A deficiency caused by mutation(s) in the PIK3R1 gene, encoding phosphatidylinositol
3-kinase regulatory subunit alpha. It is associated with autosomal recessive agammaglobulinemia
7, immunodeficiency 36 and SHORT (short stature, hyperextensibility of joints or hernia,
ocular depression, Rieger anomaly, teething delay) syndrome.;