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An inborn error of tyrosine metabolism characterised by hypertyrosinaemia with oculocutaneous manifestations and in some cases intellectual deficit. Skin lesions occur in 80% of cases, ocular involvement in 75% of cases and neurologic findings and some degree of intellectual deficit in up to 60% of cases. Onset is variable but the ocular symptoms (redness, photophobia, excessive tearing and pain) usually develop in the first year of life. Cutaneous manifestations usually begin after the first year of life but may develop at the same time as the ocular symptoms. Caused by mutations in the TAT gene (16q22.1) encoding tyrosine aminotransferase (TAT). The elevated levels of tyrosine caused by TAT deficiency appear to result in deposition of tyrosine crystals leading to an inflammatory response and the oculocutaneous findings. Transmitted as an autosomal recessive trait.
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An inborn error of tyrosine metabolism characterized by hypertyrosinemia with oculocutaneous manifestations and in some cases intellectual deficit. Skin lesions occur in 80% of cases, ocular involvement in 75% of cases and neurologic findings and some degree of intellectual deficit in up to 60% of cases. Onset is variable but the ocular symptoms (redness, photophobia, excessive tearing and pain) usually develop in the first year of life. Cutaneous manifestations usually begin after the first year of life but may develop at the same time as the ocular symptoms. Caused by mutations in the TAT gene (16q22.1) encoding tyrosine aminotransferase (TAT). The elevated levels of tyrosine caused by TAT deficiency appear to result in deposition of tyrosine crystals leading to an inflammatory response and the oculocutaneous findings. Transmitted as an autosomal recessive trait.
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