What's the hereditary pattern for retinitis pigmentosa?

It varies. Retinitis pigmentosa, or rp for short, can be caused by mutations in about 3 dozen different genes. Depending on the gene involved for a particular family, the inheritance can be dominant, recessive, x linked, digenic, or mitochondrial. Complicated! your family history and a thorough medical evaluation are the most important tools for figuring out the inheritance pattern what genes to test.