has material basis in existence starts during autosomal recessive disease retinitis pigmentosa 107 MIM:621587 A retinitis pigmentosa that is charaterized by onset of RP ranging from the second decade to the sixth decade of life, with affected individuals experiencing night blindness, constriction of peripheral vision, and reduced visual acuity and that has_material_basis_in homozygous or compound heterozygous mutation in the CFAP20 gene on chromosome 16q21. disease_ontology DOID:0051098 retinitis pigmentosa autosomal recessive inheritance Adult onset