Xeroderma Pigmentosum

Xeroderma pigmentosum is a rare inherited disorder in which cells cannot properly repair certain DNA damage caused by ultraviolet (UV) radiation. It often becomes noticeable in infancy or early childhood, when ordinary sunlight may cause severe sun sensitivity, freckling, or irritation. People with this condition have a higher risk of damage to the skin and eyes and of developing certain skin and other cancers. Strict UV protection and regular specialist care are important throughout life.

Xeroderma pigmentosum results from variants in genes involved in nucleotide excision repair, a process that removes and replaces DNA damaged by UV radiation. When this repair system does not work properly, damage can accumulate in cells exposed to sunlight or other UV sources. This explains the extreme sensitivity associated with pigmentosum xeroderma syndrome.

How Is It Inherited?

The condition usually follows an autosomal recessive inheritance pattern. This means that a child inherits a changed copy of the relevant gene from both parents; two unaffected carrier parents can therefore have an affected child. Sunlight does not cause the inherited disorder, although UV exposure triggers many of its skin and eye problems.

Genetic counseling and testing can help clarify risk for relatives and future pregnancies, especially when a family member has xeroderma disease. A genetics professional can discuss carrier testing, available testing options, and what results may mean for the family.

Clinicians may suspect xeroderma pigmentosum when a child develops severe sun sensitivity, characteristic skin or eye findings, or a relevant family history. Evaluation may include dermatology, ophthalmology, and genetics specialists who examine the skin and eyes and review the pattern and timing of symptoms. The age when symptoms began and the amount of UV exposure are also important clues.

Confirmatory Testing

A multigene panel can look for variants in genes linked to nucleotide excision repair. When needed, specialized laboratory tests can assess cellular DNA repair after UV exposure. Genetic counseling helps interpret the results, explain inheritance, and consider testing for relatives when appropriate.

Treating Skin, Eye, and Neurological Problems

Dermatology teams may remove or treat suspicious lesions and manage skin cancers, while ophthalmology teams treat eye irritation, surface damage, or other eye conditions. Neurological or functional complications may require supportive therapies and care from additional specialists. Treatment plans are individualized and continue throughout life, with ongoing coordination between the care team and family.

The inherited condition itself cannot currently be prevented, but UV-related damage and delayed diagnosis of lesions can be reduced. Consistent protection from sunlight and artificial UV sources is central to preventing avoidable complications.

Xeroderma pigmentosum is a lifelong condition, and its outlook varies by genetic subtype, UV exposure, age at diagnosis, complications, and access to consistent specialist care. Some people develop mainly skin and eye problems, while others may also have neurological involvement. The overall course can differ substantially between individuals.

Strict UV protection and regular examinations can reduce preventable damage and support earlier treatment of suspicious lesions. These measures cannot guarantee that complications will be avoided, but they are important for protecting health and quality of life over time.