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Isolated sulfite oxidase deficiency: mutation analysis and DNA-based prenatal diagnosis
J L Johnson1, K V Rajagopalan, W O Renier
1Department of Biochemistry, Duke University Medical Center, Durham, NC 27710, USA. jean_johnson@biochem.duke.edu
Prenatal Diagnosis
|May 10, 2002
Summary
Isolated sulfite oxidase deficiency, a severe neurological disorder, is caused by SUOX gene defects. This study details a novel mutation and successful prenatal diagnosis, enabling the birth of a healthy child.
Area of Science:
- Biochemistry
- Genetics
- Neurology
Background:
- Isolated sulfite oxidase deficiency is a rare, autosomal recessive neurological disorder.
- It stems from defects in the SUOX gene, crucial for sulfur amino acid degradation.
- Severe forms lead to intractable seizures, brain pathology, and early death.
Observation:
- A newborn presented with clinical features of sulfite oxidase deficiency.
- Fibroblast cultures showed no detectable sulfite oxidase activity.
- A unique four-base pair deletion was identified in the patient's SUOX cDNA.
Findings:
- The identified SUOX gene deletion mutation was present in a homozygous state in the affected infant.
- Both parents were heterozygous carriers of the same mutation.
- Prenatal diagnosis using DNA analysis was successfully applied to subsequent pregnancies.
Implications:
- This study identifies a novel mutation causing isolated sulfite oxidase deficiency.
- DNA-based prenatal diagnosis offers effective genetic counseling and management for affected families.
- Early detection and intervention can prevent severe outcomes, allowing for the birth of unaffected children.