A population-based study of the clinical expression of the hemochromatosis gene

Olynyk, John K. , Cullen, Digby J. , Aquilia, Sina, Rossi, Enrico, Summerville, Lesa and Powell, Lawrie W. (1999) A population-based study of the clinical expression of the hemochromatosis gene. New England Journal of Medicine, 341 10: 718-724. doi:10.1056/NEJM199909023411002

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Author Olynyk, John K.
Cullen, Digby J.
Aquilia, Sina
Rossi, Enrico
Summerville, Lesa
Powell, Lawrie W.
Title A population-based study of the clinical expression of the hemochromatosis gene
Journal name New England Journal of Medicine   Check publisher's open access policy
ISSN 0028-4793
1533-4406
Publication date 1999-09-02
Sub-type Article (original research)
DOI 10.1056/NEJM199909023411002
Open Access Status File (Publisher version)
Volume 341
Issue 10
Start page 718
End page 724
Total pages 7
Place of publication Waltham, MA, USA
Publisher Massachusetts Medical Society
Collection year 1999
Language eng
Formatted abstract
Background and Methods: Hereditary hemochromatosis is associated with homozygosity for the C282Y mutation in the hemochromatosis (HFE) gene on chromosome 6, elevated serum transferrin saturation, and excess iron deposits throughout the body. To assess the prevalence and clinical expression of the HFE gene, we conducted a population-based study in Busselton, Australia. In 1994, we obtained blood samples for the determination of serum transferrin saturation and ferritin levels and the presence or absence of the C282Y mutation and the H63D mutation (which may contribute to increased hepatic iron levels) in 3011 unrelated white adults. We evaluated all subjects who had persistently elevated transferrin-saturation values (45 percent or higher) or were homozygous for the C282Y mutation. We recommended liver biopsy for subjects with serum ferritin levels of 300 ng per milliliter or higher. The subjects were followed for up to four years.

Results: Sixteen of the subjects (0.5 percent) were homozygous for the C282Y mutation, and 424 (14.1 percent) were heterozygous. The serum transferrin saturation was 45 percent or higher in 15 of the 16 who were homozygous; in 1 subject it was 43 percent. Four of the homozygous subjects had previously been given a diagnosis of hemochromatosis, and 12 had not. Seven of these 12 patients had elevated serum ferritin levels in 1994; 6 of the 7 had further increases in 1998, and 1 had a decrease, although the value remained elevated. The serum ferritin levels in the four other homozygous patients remained in the normal range. Eleven of the 16 homozygous subjects underwent liver biopsy; 3 had hepatic fibrosis, and 1, who had a history of excessive alcohol consumption, had cirrhosis and mild microvesicular steatosis. Eight of the 16 homozygous subjects had clinical findings that were consistent with the presence of hereditary hemochromatosis, such as hepatomegaly, skin pigmentation, and arthritis.

Conclusions: In a population of white adults of northern European ancestry, 0.5 percent were homozygous for the C282Y mutation in the HFE gene. However, only half of those who were homozygous had clinical features of hemochromatosis, and one quarter had serum ferritin levels that remained normal over a four-year period. (N Engl J Med 1999;341:718-24.) (C)1999, Massachusetts Medical Society.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Medicine Publications
 
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