UV-sensitive syndrome

UV-sensitive syndrome (UVSS) is a rare autosomal recessive disorder of DNA repair characterized by heightened sensitivity to ultraviolet (UV) radiation. It belongs to the group of nucleotide excision repair (NER) disorders but is notably milder than other conditions in this category, such as xeroderma pigmentosum or Cockayne syndrome. UVSS is caused by defects in the transcription-coupled nucleotide excision repair (TC-NER) pathway. Three genetic subtypes have been identified: UVSS1 (caused by mutations in the ERCC6/CSB gene), UVSS2 (caused by mutations in the ERCC8/CSA gene), and UVSS3 (caused by mutations in the UVSSA gene). The condition primarily affects the skin. Patients typically present with acute sunburn reactions upon minimal sun exposure, freckling in sun-exposed areas, and mild photosensitivity. Telangiectasias (small dilated blood vessels) on the skin may also be observed. Importantly, unlike xeroderma pigmentosum, UVSS is not associated with an increased risk of skin cancer. Additionally, unlike Cockayne syndrome — which involves mutations in the same genes (ERCC6 and ERCC8) — UVSS does not cause neurological degeneration, growth failure, or other systemic features. The reasons for this phenotypic difference despite shared genetic origins remain an active area of research. There is currently no specific curative treatment for UV-sensitive syndrome. Management is primarily preventive and supportive, focusing on strict sun protection measures including the use of broad-spectrum sunscreen, protective clothing, UV-blocking eyewear, and avoidance of unnecessary UV exposure. Regular dermatological monitoring is recommended. The prognosis is generally favorable, with a normal lifespan expected and no significant systemic complications reported.

Common questions about UV-sensitive syndrome