E70.2

Clinical Causes: Genetic mutations affecting enzyme function involved in tyrosine breakdown Inheritance in an autosomal recessive pattern, meaning both parents must pass on the faulty gene Enzyme deficiencies typically involve tyrosine aminotransferase or 4-hydroxyphenylpyruvate dioxygenase No environmental or lifestyle factors are known to directly cause these disorders

Key Symptoms: Elevated levels of tyrosine and related compounds in the blood and urine Possible liver or kidney issues due to accumulation of toxic substances Skin rashes or dermatitis Light sensitivity or eye problems In some cases, developmental delays or neurological issues Poor appetite and weight loss in severe cases

Diagnosis Path: Diagnosing disorders of tyrosine metabolism involves a combination of laboratory tests and clinical assessments. Common steps include: - Blood tests measuring levels of tyrosine and related metabolites - Urine analysis for abnormal organic acids - Enzyme activity assays to identify specific enzyme deficiencies - Genetic testing to detect mutations in relevant genes Early diagnosis is key to managing these conditions effectively, especially in newborns identified through routine metabolic screening programs.

Treatment Protocols: Currently, treatment strategies focus on managing symptoms and preventing complications. Approaches may include: - Dietary restrictions to limit tyrosine intake, though this must be carefully balanced to avoid nutritional deficiencies - Supplementation with vitamins or cofactors if needed - Regular monitoring of amino acid levels - Supportive therapies for developmental or neurological issues - In some cases, medications to manage symptoms or reduce the build-up of harmful substances Although there is no cure, proper management can greatly improve quality of life and reduce the risk of long-term complications.