Normal pregnancy outcome in L-2-hydroxyglutaric aciduria

Area of Science:

• Biochemistry
• Neurology
• Genetics

Background:

• L-2-Hydroxyglutaric aciduria (L-2-HGA) is a rare, progressive neurometabolic disease characterized by intellectual disability and neurological deficits.
• The condition's hallmark is elevated urinary L-2-hydroxyglutaric acid, with affected individuals showing brain abnormalities on MRI.
• Current management for L-2-HGA is purely supportive.

Observation:

• This report details a pregnancy in a 30-year-old Turkish mother diagnosed with L-2-HGA, despite medical advice against it due to potential risks.
• Amniotic fluid analysis at 5 months gestation revealed elevated 2-hydroxyglutarate levels (27.5 μmol/L), significantly higher than controls (<1.3 μmol/L).
• The pregnancy progressed without complications.

Findings:

• The child, born unaffected by L-2-HGA, exhibited normal urinary 2-hydroxyglutaric acid excretion.
• At three years of age, the child demonstrated excellent somatic and mental development.
• This case presents a seemingly protected fetus despite maternal L-2-HGA diagnosis.

Implications:

• The underlying mechanisms protecting the fetus from the severe neurological damage seen in affected individuals remain largely unknown.
• Despite recent advances in identifying the mutated gene and deficient enzyme in L-2-HGA, the pathogenesis of brain damage is still unclear.
• Further research is needed to understand how the embryo and fetus are spared in cases of maternal L-2-HGA.