Aceruloplasminemia: Molecular characterization of this disorder of iron metabolism

Z. Leah Harris, Yoshitomo Takahashi, Hiroaki Miyajima, Masahiro Serizawa, Ross T A Macgillivray, Jonathan D. Gitlin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

480 Scopus citations

Abstract

Ceruloplasmin is an abundant α2-serum glycoprotein that contains 95% of the copper found in the plasma of vertebrate species. We report here on the identification of a genetic defect in the ceruloplasmin gene in a patient previously noted to have a total absence of circulating serum ceruloplasmin in association with late-onset retinal and basal ganglia degeneration. In this patient T2 (transverse relaxation time)-weighted magnetic resonance imaging of the brain revealed basal ganglia densities consistent with iron deposition, and liver biopsy confirmed the presence of excess iron. Although Southern blot analysis of the patient's DNA was normal, PCR amplification of 18 of the 19 exons composing the human ceruloplasmin gene revealed a distinct size difference in exon 7. DNA sequence analysis of this exon revealed a 5- bp insertion at amino acid 410, resulting in a frame-shift mutation and a truncated open reading frame. The validity of this mutation was confirmed by analysis of DNA from the patient's daughter, which revealed heterozygosity for this same 5-bp insertion. The presence of this mutation in conjunction with the clinical and pathologic findings demonstrates an essential role for ceruloplasmin in human biology and identifies aceruloplasminemia as an autosomal recessive disorder of iron metabolism. These findings support previous studies that identified ceruloplasmin as a ferroxidase and are remarkably consistent with recent studies on the essential role of a homologous copper oxidase in iron metabolism in yeast. The clinical and laboratory findings suggest that additional patients with movement disorders and nonclassical Wilson disease should be examined for ceruloplasmin gene mutations.

Original languageEnglish (US)
Pages (from-to)2539-2543
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume92
Issue number7
DOIs
StatePublished - Mar 28 1995

ASJC Scopus subject areas

  • General

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