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Testing families with HFE-related hereditary haemochromatosis
M A Siezenga1, E Rasp, P W Wijermans
1Department of Haematology, Leyenburg Hospital, Leyweg 275, The Hague, The Netherlands.
Insights
HFE-related hereditary hemochromatosis, a common genetic disorder, can be detected through family testing. Screening second-degree relatives may be cost-effective for identifying individuals at risk of iron overload.
Area of Science:
- Genetics
- Internal Medicine
- Medical Diagnostics
Background:
- HFE-related hereditary hemochromatosis is the most prevalent autosomal recessive disorder among Caucasians.
- The HFE gene, identified in 1996, is responsible for this condition.
- The C282Y and H63D mutations are the most significant and frequently observed in the Caucasian population.
Observation:
- A family study involved phenotypic and genotypic testing of first- and second-degree relatives of an affected individual.
- Both C282Y homozygosity and compound heterozygosity were identified in second-degree relatives.
- Testing only first-degree relatives may miss 2.5% of at-risk individuals.
Findings:
- Family testing is valuable for identifying individuals predisposed to developing iron overload.
- Cascade screening of second-degree relatives can be a cost-effective strategy.
- Genotypic and phenotypic analysis aids in understanding disease inheritance patterns within families.
Implications:
- Early detection through comprehensive family screening can prevent iron overload complications.
- Expanding screening to second-degree relatives enhances diagnostic accuracy and public health outcomes.
- Cost-effective cascade screening strategies can improve the management of hereditary hemochromatosis.
Abstract:
HFE-related hereditary haemochromatosis is the most common autosomal recessive disorder in the Caucasian population. In 1996 the responsible gene (called HFE) was identified. Two mutations (C282Y and H63D) are considered most important and occur frequently in the Caucasian population. We describe a family of an affected proband in which first- and second-degree relatives were tested phenotypically and genotypically. In second-degree relatives both C282Y homozygosity as well as compound heterozygosity were found. Family testing can be useful to detect persons who will possibly develop iron overload. We must be aware that testing first-degree relatives only carries a 2.5% chance that persons at risk of developing iron loading will not be detected. Cascade screening of second-degree relatives might be cost-effective.
