alcaptonuria
Noun: A rare, inherited, recessive metabolic disorder. It is characterized by two primary features: the presence of alkapton (homogentisic acid) in the urine, and ochronosis, a bluish-black discoloration of connective tissue.
The term is used in medical and biochemical contexts to describe a specific genetic condition. * The diagnosis of alcaptonuria is confirmed by detecting homogentisic acid in the urine. * Patients with alcaptonuria often develop arthritis later in life due to ochronosis.
- Biochemical Basis: The disorder is caused by a deficiency of the enzyme homogentisate 1,2-dioxygenase, which leads to the accumulation of homogentisic acid.
- Clinical Presentation: While alkaptonuria may be present from birth, symptoms like darkening of urine upon standing and joint pain (ochronotic arthropathy) typically manifest in adulthood.
- Alkaptonuria: This is the more common modern spelling of the same condition.
- Ochronosis: (noun) The pathological pigmentation of tissues, a hallmark of alcaptonuria.
- Homogentisic acid: (noun) The chemical compound (alkapton) that accumulates and is excreted in the urine of affected individuals.
- Homogentisic aciduria: A synonym that directly names the excreted substance.
- AKU: A common medical abbreviation for alkaptonuria.
This word refers specifically to a single, well-defined genetic disease. It is not used metaphorically or in non-medical contexts. The core concept links a genetic enzyme defect (metabolic anomaly) to its biochemical consequence (alkapton in urine) and its clinical effect (ochronosis).
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a rare recessive metabolic anomaly marked by ochronosis and the presence of alkapton in the urine
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