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Related Experiment Videos

Detection of aneuploidies by paralogous sequence quantification.

S Deutsch1, U Choudhury, G Merla

  • 1Department of Genetic Medicine and Development, University of Geneva Medical School, GE 1211, Geneva, Switzerland. Stylianos.antonarakis@medecine.unige.ch

Journal of Medical Genetics
|December 14, 2004
PubMed
Summary

Paralogous sequence quantification (PSQ) offers a rapid and accurate prenatal diagnosis for common chromosomal aneuploidies. This PCR-based method provides a competitive alternative to traditional karyotyping in diagnostic labs.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Medical Diagnostics

Background:

  • Chromosomal aneuploidies cause congenital disorders with cognitive impairment and dysmorphic features.
  • Current prenatal diagnosis via karyotyping is labor-intensive and time-consuming (approx. 14 days).

Purpose of the Study:

  • To develop and evaluate a novel PCR-based method, paralogous sequence quantification (PSQ), for rapid prenatal diagnosis of aneuploidies.

Main Methods:

  • PSQ utilizes paralogous genes and pyrosequencing to quantify relative chromosome dosage.
  • Ten assays were designed to detect trisomies 13, 18, 21, and sex chromosome aneuploidies.

Main Results:

  • The method was evaluated on 175 enriched DNA samples.

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  • Accurate diagnoses were achieved for 119/120 aneuploid samples and all controls.
  • One sample showed intermediate results for chromosome 13 assays, preventing diagnosis.

    • Conclusions:

    • PSQ is a robust, interpretable, and easily implemented method for diagnosing common aneuploidies.
    • The method provides results in under 48 hours, offering a faster alternative to karyotyping.