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Related Experiment Videos

Molybdenum cofactor deficiency: first prenatal genetic analysis.

J Reiss1, E Christensen, C Dorche

  • 1Institut für Humangenetik der Universität, Göttingen, Germany. jreiss@gwdg.de

Prenatal Diagnosis
|May 18, 1999
PubMed
Summary

Molybdenum cofactor (MoCo) deficiency is a rare genetic disorder with no known cure. Molecular genetic analysis of the MOCS1 gene allows for accurate prenatal diagnosis and carrier identification.

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Area of Science:

  • Biochemistry
  • Genetics
  • Medical Diagnostics

Background:

  • Molybdenum cofactor (MoCo) deficiency causes severe neurological symptoms and early death due to the loss of essential molybdo-enzyme activity.
  • Current prenatal diagnosis relies on sulfite oxidase activity, but carrier diagnosis is not possible.
  • Recent cloning of human MoCo biosynthesis genes, including MOCS1, offers new diagnostic avenues.

Observation:

  • A Danish family underwent parallel enzymatic and molecular genetic analysis during chorionic villus sampling.
  • Sulfite oxidase activity in uncultured CVS material was normal.
  • A homozygous MOCS1 splice site mutation in the affected infant was identified as heterozygous in cultured chorionic cells.

Findings:

  • The MOCS1 gene mutation was confirmed as the cause of MoCo deficiency in the affected infant.

Related Experiment Videos

  • Prenatal diagnosis was successfully achieved through molecular genetic analysis of the MOCS1 gene.
  • Heterozygous carriers of MoCo deficiency alleles are asymptomatic, as observed in the cultured chorionic cells.

    • Implications:

    • Molecular genetic testing of the MOCS1 gene enables accurate prenatal diagnosis of MoCo deficiency.
    • This approach allows for the identification of asymptomatic carriers within affected families.
    • The findings pave the way for improved genetic counseling and family planning for individuals at risk of MoCo deficiency.