S65C and other mutations in the haemochromatosis gene in the Czech population

Area of Science:

• Genetics
• Human Genetics
• Molecular Biology

Background:

• Hereditary hemochromatosis is a common autosomal recessive disorder in Caucasians, characterized by excessive iron absorption and subsequent organ damage.
• The HFE gene, particularly mutations C282Y and H63D, accounts for over 80% of cases. The S65C mutation is found in a smaller percentage of patients negative for the other two.
• Understanding the prevalence of these HFE mutations is crucial for genetic screening and managing hereditary hemochromatosis.

Purpose of the Study:

• To determine the allele frequencies of HFE gene mutations, specifically S65C, C282Y, and H63D, within the Czech population.
• To compare these frequencies with those observed in other Central European populations.

Main Methods:

• DNA was extracted from 481 newborn screening cards (Guthrie cards) collected randomly from across the Czech Republic.
• Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) was employed to analyze the HFE gene for the presence of S65C, C282Y, and H63D mutations.

Main Results:

• No homozygous S65C or C282Y mutations were detected. Eight samples (1.67%) were homozygous for H63D.
• Heterozygous frequencies were: S65C (2.49%), C282Y (6.86%), and H63D (26.61%). Compound heterozygotes were also identified.
• Calculated allele frequencies were: S65C (1.25%), C282Y (3.43%), and H63D (14.97%).

Conclusions:

• The genotype frequencies of HFE mutations in the Czech Republic align with those previously reported for other Central European populations.
• These findings contribute to the understanding of hereditary hemochromatosis epidemiology in this region.
• The study provides baseline data for potential genetic screening programs targeting HFE mutations in the Czech Republic.