Pcna-Related Progressive Neurodegenerative Photosensitivity Syndrome

PCNA-related progressive neurodegenerative photosensitivity syndrome is a rare neurodegenerative disease caused by homozygous mutations in the PCNA gene and characterized by neurodegeneration, postnatal growth retardation, prelingual sensorineural hearing loss, premature aging, ocular and cutaneous telangiectasia, learning difficulties, photophobia, and photosensitivity with evidence of predisposition to sun-induced malignancy. Progressive neurologic deterioration leads to gait disturbances, muscle weakness, speech and swallowing difficulties and progressive cognitive decline.