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ALAD porphyria

S Sassa1

  • 1Laboratory for Biochemical Hematology, Rockefeller University, New York, N.Y. 10021, USA.

Seminars in Liver Disease
|March 28, 1998
PubMed
Summary
This summary is machine-generated.

Aminolevulinic acid dehydratase (ALAD) porphyria is a rare genetic disorder. Patients have low ALAD activity, leading to excess ALA excretion but not PBG, distinguishing it from other porphyrias.

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Area of Science:

  • Biochemistry
  • Genetics
  • Metabolic Disorders

Background:

  • ALAD porphyria is an autosomal recessive disorder caused by a deficiency in aminolevulinic acid dehydratase (ALAD).
  • This deficiency leads to a near-complete lack of ALAD enzyme activity.
  • Patients excrete significant amounts of aminolevulinic acid (ALA) in urine, but not porphobilinogen (PBG).

Purpose of the Study:

  • To describe the key biochemical and genetic features of ALAD porphyria.
  • To differentiate ALAD porphyria from other similar porphyrias, particularly Acute Intermittent Porphyria (AIP).

Main Methods:

  • Biochemical analysis of urinary porphyrin precursors (ALA and PBG).
  • Genetic analysis to confirm autosomal recessive inheritance.
  • Enzyme activity assays for ALAD.

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Main Results:

  • Patients presented with markedly decreased ALAD enzyme activity.
  • Elevated urinary ALA levels were observed, with normal PBG levels.
  • Autosomal recessive inheritance pattern was confirmed.

Conclusions:

  • ALAD porphyria is characterized by severe ALAD deficiency, resulting in ALA overproduction.
  • It can be distinguished from AIP by its inheritance pattern (recessive vs. dominant), lack of PBG overproduction, and significantly reduced ALAD activity.