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Gut. 1998 December; 43(6): 830–836.
PMCID: PMC1727339

The significance of haemochromatosis gene mutations in the general population: implications for screening

Abstract

Background—Haemochromatosis is associated with mutations in the HFE gene but the significance of these mutations in the general population is unknown.
Aims—To determine the frequency of HFE gene mutations in the general population, their effect on serum iron indexes, and their role in screening for haemochromatosis.
Methods—Deoxyribonucleic acid (DNA) from 1064 randomly selected subjects was analysed for the C282Y and H63D mutations in the HFE gene. Serum iron, transferrin saturation, and ferritin were measured and individuals with increased iron indexes were investigated to confirm or exclude a clinical diagnosis of haemochromatosis.
Results—Mutations were identified in 409 individuals (38.4%) with heterozygote (carrier) frequencies of 13.2% and 24.3% for the C282Y and H63D mutations respectively. Heterozygosity for either mutation significantly increased serum iron and transferrin saturation but despite a similar trend for ferritin, this was only significant for C282Y homozygotes. Five individuals (0.47%) were homozygous for the C282Y mutation, three of whom had haemochromatosis confirmed by liver biopsy (0.28%). The other two C282Y homozygotes would not have been detected by phenotypic screening alone.
ConclusionsHFE mutations are present in 38.4% of the population, affect serum iron indexes, and are important determinants of iron status. The population frequency of genetically defined haemochromatosis (C282Y homozygosity) is approximately one in 200 and is higher than the prevalence of clinically apparent haemochromatosis.

Keywords: haemochromatosis; iron overload; HFE gene; screening

Figure 1
Flow diagram summarising the results of phenotypic screening for haemochromatosis. *Includes one C282Y homozygote with an initial serum ferritin of 178 µg/l but a repeat value of 158 µg/l who did not have a liver biopsy performed.
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