Any paroxysmal nocturnal hemoglobinuria in which the cause of the disease is a mutation in the PIGA gene. The disease is MONDO_0010438 (paroxysmal nocturnal hemoglobinuria 1). Also known as: PIGA paroxysmal nocturnal hemoglobinuria, pIgA paroxysmal nocturnal hemoglobinuria, paroxysmal nocturnal hemoglobinuria caused by mutation in PIGA, paroxysmal nocturnal hemoglobinuria caused by mutation in pIgA, paroxysmal nocturnal hemoglobinuria type 1, paroxysmal nocturnal hemoglobinuria, somatic.