Q82.1

Clinical Causes: Mutations in specific genes responsible for DNA repair, particularly those involved in fixing UV-induced damage. Inherited in an autosomal recessive pattern, meaning a person needs to inherit the defective gene from both parents to develop the condition. Genetic variations that impair the body's ability to repair DNA damage caused by sunlight, leading to the accumulation of mutations.

Key Symptoms: Severe sensitivity to sunlight, causing redness and swelling upon minimal UV exposure. Early onset of skin changes, such as dryness, discoloration, and rough patches. Multiple, atypical sunburns that occur rapidly and persist longer than usual. Freckling and pigmentation changes in sun-exposed areas, often appearing in early childhood. Development of benign and malignant skin tumors, including basal cell carcinoma, squamous cell carcinoma, and melanoma, often appearing at a young age. Eyes may be affected, with symptoms like photophobia, dryness, or increased risk of ocular cancers. Neurological symptoms can sometimes be present, including developmental delays, hearing loss, or intellectual disabilities.

Diagnosis Path: Diagnosis is primarily based on clinical observation of symptoms and a detailed family history. Confirmation involves genetic testing to identify mutations in DNA repair genes. Dermatological examinations and skin biopsies can help detect precancerous or cancerous lesions. In some cases, specialized tests assess cellular responses to UV radiation, and neurological evaluations may be conducted if neurological symptoms are suspected.

Treatment Protocols: Strict sun protection measures, such as wearing protective clothing, wide-brimmed hats, UV-blocking sunglasses, and applying high-SPF broad-spectrum sunscreens daily. Regular dermatological check-ups to identify and treat skin abnormalities early. Prompt treatment of skin cancers with surgical excision, topical treatments, or other dermatological procedures. Use of indoor lighting that minimizes UV exposure whenever possible. Genetic counseling for affected families to understand inheritance patterns and risks. Supportive therapies for neurological symptoms if present, including physical, occupational, and speech therapies. Awareness and education about the importance of sun safety to prevent skin damage. Research into gene therapy and other advanced treatments is ongoing but not yet standard practice.