Gene List:
ALAD, ALAS2, C15orf41, CPOX, FECH, HFE, HMBS, LAD, PPOX, SLC19A2, UROD, UROS

References:
Gouya L. et al. Contribution of a common single-nucleotide polymorphism to the genetic predisposition for erythropoietic protoporphyria. Am J Hum Genet. 2006 Jan;78(1):2-14.

Mendez M. et al. Familial porphyria cutanea tarda: characterization of seven novel uroporphyrinogen decarboxylase mutations and frequency of common hemochromatosis alleles. Am J Hum Genet. 1998 Nov;63(5):1363-75.

Whatley S.D. et al. Gene dosage analysis identifies large deletions of the FECH gene in 10% of families with erythropoietic protoporphyria. The Journal of Investigative Dermatology. J Invest Dermatol. 2007 Dec;127(12):2790-4.