Definition

Noun: 1. A genetic disorder: Tyrosinemia is an autosomal recessive metabolic defect. This means it is an inherited condition where the body cannot properly break down the amino acid tyrosine, leading to its accumulation. 2. A cause of specific health issues: The defect results in disturbances, primarily affecting the liver and kidneys, and can also cause intellectual disability (historically referred to as mental retardation).

Usage

• Medical Diagnosis: The term is used almost exclusively in medical contexts to diagnose and discuss the condition.
  • The newborn screening test indicated a possibility of tyrosinemia.
  • There are different types of tyrosinemia, with type I being the most severe.
• Describing Symptoms or Management: It is used when discussing the effects or treatment of the disorder.
  • The primary treatment for tyrosinemia involves a strict diet low in tyrosine and phenylalanine.
  • Liver failure is a serious potential complication of untreated tyrosinemia.

Advanced Usage

• Specifying Types: In detailed medical discourse, the word is often specified as tyrosinemia type I (hepatorenal tyrosinemia), type II (oculocutaneous tyrosinemia), or type III, each referring to deficiencies in different enzymes in the metabolic pathway.
  • Nitisinone is a medication used to treat hereditary tyrosinemia type I.

Variants and Related Words

• Tyrosine (noun): The amino acid that the body fails to metabolize correctly in this condition.
• Hypertyrosinemia (noun): A more general term for elevated tyrosine levels in the blood, which can be caused by tyrosinemia or other conditions.

Synonyms

• Hereditary tyrosinemia: This full phrase is often used synonymously.
• Tyrosine aminotransferase deficiency: This is a specific synonym for tyrosinemia type II.
• Fumarylacetoacetase deficiency: This is a specific synonym for tyrosinemia type I.

Notes on Terminology

• The reference context uses the term "mental retardation." In contemporary medical and general use, the preferred and more respectful terms are intellectual disability or impaired cognitive development.

Noun

1. autosomal recessive defect in tyrosine metabolism resulting in liver and kidney disturbances and mental retardation