Zap70-Related Severe Combined Immunodeficiency, also known as zeta-associated protein 70 deficiency, is related to immunodeficiency 48 and purine nucleoside phosphorylase deficiency, and has symptoms including diarrhea An important gene associated with Zap70-Related Severe Combined Immunodeficiency is ZAP70 (Zeta Chain Of T Cell Receptor Associated Protein Kinase 70). Affiliated tissues include skin and t cells.