Increased C282Y heterozygosity in gestational diabetes.

Area of Science:

• Genetics and Genomics
• Endocrinology and Metabolism
• Reproductive Medicine

Background:

• Hereditary hemochromatosis is an autosomal recessive iron metabolism disorder linked to diabetes mellitus.
• Gestational diabetes mellitus (GDM) affects pregnant women, and its genetic risk factors are under investigation.
• The hemochromatosis gene (HFE) is a potential candidate for influencing GDM development.

Purpose of the Study:

• To investigate the prevalence of HFE gene mutations (C282Y and H63D) in patients diagnosed with GDM.
• To compare HFE mutation frequencies in GDM patients versus healthy pregnant controls.
• To assess the potential role of HFE mutations as a risk factor for GDM.

Main Methods:

• Screening of 2,421 pregnant women between 24-28 weeks gestation over 18 months.
• Diagnosis of GDM in 208 women.
• Genotyping for HFE mutations C282Y and H63D in 208 GDM patients and 170 matched controls.

Main Results:

• The C282Y mutation allele frequency was significantly higher in North and Central European GDM patients (7.7%) compared to controls (2.9%; p=0.04).
• No significant difference in H63D mutation frequency was observed between GDM patients and controls.
• Serum ferritin levels were elevated in GDM patients, regardless of HFE mutation status, while transferrin saturation was similar between groups.

Conclusions:

• The increased frequency of the C282Y HFE allele in North and Central European GDM patients suggests a genetic susceptibility.
• HFE gene mutations, particularly C282Y, may contribute to the risk of developing GDM in specific ethnic groups.
• Further research is warranted to elucidate the precise mechanisms linking HFE mutations and GDM.