T-Cell Immunodeficiency, Congenital Alopecia, and Nail Dystrophy, also known as t-cell immunodeficiency, congenital alopecia and nail dystrophy, is related to severe combined immunodeficiency due to foxn1 deficiency and immune deficiency disease. An important gene associated with T-Cell Immunodeficiency, Congenital Alopecia, and Nail Dystrophy is FOXN1 (Forkhead Box N1), and among its related pathways/superpathways are Nervous system development and Keratinization. Affiliated tissues include t cells and thymus, and related phenotypes are alopecia and nail dystrophy