How are the porphyrias inherited? can my children inherit porphyria from me?

It is possible: It is autosomal dominant. In addition there are 200 different mutations. The porphobilinogen deaminase gene is responsible - not providing enough to breakdown heme. 1-5 cases per 100, 000 people in the USA.

See below: Case of porphyria vary in their inheritance pattern. Some are autosomal dominate and only require one gene to be inherited. So the child would have a fifty percent chance. Others are autosomal recessive and require two genes, one form each parent. The child would have a twenty five percent chance.