What causes damage to the liver and kidneys due to a deficiency in enzyme function?

What causes damage to the liver and kidneys due to a deficiency in enzyme function?

• A. Homocystinuria
• B. Maple syrup urine disease
• C. Tyrosinemia
• D. Cystinuria

Answer: (C)

Tyrosinemia is a metabolic disorder that results from a deficiency in enzymes involved in the breakdown of the amino acid tyrosine. Specifically, this disorder is often related to a deficiency in the enzyme fumarylacetoacetate hydrolase, which is crucial for the degradation of tyrosine. When this enzyme does not function properly, toxic metabolites build up in the body, leading to significant damage, particularly to the liver and kidneys.

The liver is profoundly affected in tyrosinemia, as it is the primary site for amino acid metabolism and detoxification. The accumulation of toxic metabolites can lead to hepatic dysfunction, hepatic failure, and in severe cases, liver cancer. Similarly, the kidneys can suffer damage due to the overexcretion of these metabolites, resulting in renal impairment.

Other conditions listed, such as homocystinuria, maple syrup urine disease, and cystinuria, involve different pathways of amino acid metabolism or transport but do not specifically result in the same pattern of liver and kidney damage as seen in tyrosinemia. For instance, homocystinuria primarily affects metabolism related to homocysteine and can lead to cardiovascular issues, while maple syrup urine disease leads to neurological deterioration. Cystinuria is