homogentisic acid

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homogentisic acid

A scientist observes homogentisic acid in a clear test tube.

Definition

Noun: 1. A biochemical compound: Homogentisic acid is a specific organic acid. It is formed inside the body as a temporary, intermediate substance during the metabolic breakdown (catabolism) of the amino acids tyrosine and phenylalanine. Its accumulation is associated with a rare genetic disorder.

Usage
  • Homogentisic acid is primarily discussed in biochemical and medical contexts.
  • It is the compound that builds up in the blood and tissues of individuals with alkaptonuria, a metabolic disease.
  • In a healthy metabolism, homogentisic acid is quickly broken down further and does not accumulate.
Examples
  • Scientific Context:
    • The enzyme deficiency prevents the further metabolism of homogentisic acid.
    • Researchers measured the concentration of homogentisic acid in the patient's urine.
  • Medical Context:
    • A key symptom of alkaptonuria is urine that darkens upon exposure to air due to the presence of homogentisic acid.
    • The long-term deposition of homogentisic acid in connective tissues leads to ochronosis.
Advanced Usage
  • Biochemical Pathway: Homogentisic acid is a central intermediate in the catabolic pathway for aromatic amino acids. Its conversion to maleylacetoacetate is catalyzed by the enzyme homogentisate 1,2-dioxygenase.
  • Diagnostic Marker: The detection of elevated levels of homogentisic acid in urine is a definitive diagnostic test for alkaptonuria.
Variants and Related Words
  • Alkaptonuria (n): The inherited metabolic disorder characterized by the inability to metabolize homogentisic acid.
  • Ochronosis (n): The bluish-black discoloration of tissues caused by the long-term deposition of homogentisic acid polymer.
  • Homogentisate (n): The salt or ester form of homogentisic acid (e.g., homogentisate 1,2-dioxygenase).
Synonyms
  • 2,5-dihydroxyphenylacetic acid: This is the systematic chemical name for homogentisic acid.
  • Alcapton (archaic): An older term for the substance, from which "alkaptonuria" is derived.
Notes
  • There are no phrasal verbs or idioms associated with this highly technical term. Its usage is confined to scientific nomenclature and medical diagnosis.
homogentisic acid

A scientist observes homogentisic acid in a clear test tube.

Noun
  1. an acid formed as an intermediate product of the metabolism of tyrosine and phenylalanine

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