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Specific knockout of kidney homogentisate 1,2-dioxygenase reveals that local metabolism of tyrosine and homogentisic acid is negligible in alkaptonuria.

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Alkaptonuria - Past, present and future.

Andrew S Davison1, Brendan P Norman2

  • 1Department of Clinical Biochemistry and Metabolic Medicine, Liverpool Clinical Laboratories, Royal Liverpool University Hospitals Trust, Liverpool, United Kingdom; Department of Musculoskeletal & Ageing Science, Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom.

Advances in Clinical Chemistry
|June 2, 2023
PubMed
Summary
This summary is machine-generated.

Alkaptonuria (AKU) is a rare metabolic disorder causing homogentisic acid (HGA) buildup. This review details AKU

Keywords:
AlkaptonuriaMetabolismNitisinoneOchronosisTyrosine

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Area of Science:

  • Biochemistry
  • Genetics
  • Metabolic Disorders

Background:

  • Alkaptonuria (AKU) is an ultra-rare inherited metabolic disorder affecting tyrosine metabolism.
  • It leads to homogentisic acid (HGA) accumulation, causing lifelong health issues and reduced quality of life, typically from the third decade.
  • Understanding AKU's natural history, clinical, biochemical, and genetic aspects is crucial.

Approach:

  • This review synthesizes current knowledge on AKU pathophysiology and treatment.
  • It includes updates on murine models and human studies, detailing molecular and biochemical insights.
  • The impact of nitisinone treatment, particularly concerning hypertyrosinemia, is critically examined.

Key Points:

  • AKU pathophysiology involves homogentisic acid (HGA) accumulation due to a defect in the tyrosine metabolic pathway.
  • Clinical manifestations are progressive and significantly impact patient quality of life.
  • Nitisinone treatment shows promise but requires further investigation regarding hypertyrosinemia management.

Conclusions:

  • AKU management requires a comprehensive understanding of its natural history and treatment responses.
  • Future research should focus on novel therapies for hypertyrosinemia and potentially curative gene/cell therapies.
  • Continued investigation into AKU's molecular mechanisms and treatment efficacy is essential for improving patient outcomes.