These diseases, which include autosomal-dominant acute intermittent porphyria (AIP), variegate porphyria (VP), hereditary coproporphyria (HCP), and the autosomal-recessive delta-aminolevulinic acid dehydratase-deficient porphyria, are characterized by acute neurovisceral attacks, chronic symptoms, and long-term complications [1–3]. The gene discussed is ALAD; the disease is Porphyria variegata.