C1q Deficiency 1, also known as c1q deficiency, is related to lupus erythematosus and systemic lupus erythematosus. An important gene associated with C1q Deficiency 1 is C1QA (Complement C1q A Chain), and among its related pathways/superpathways are Complement cascade and Diseases of hemostasis. Affiliated tissues include skin and kidney, and related phenotypes are systemic lupus erythematosus and membranoproliferative glomerulonephritis