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Related Experiment Videos

Prenatal RHD gene determination and dosage analysis by PCR: clinical evaluation.

F Y Chan1, N M Cowley, L Wolter

  • 1Department of Maternal-Fetal Medicine, Mater Mothers' Hospital, South Brisbane, Australia. fchan@mater.org.au

Prenatal Diagnosis
|April 5, 2001
PubMed
Summary

Polymerase chain reaction (PCR) accurately determines RHD gene status and dosage in at-risk pregnancies. This strategy improves prenatal diagnosis of hemolytic disease of the newborn (HDN), preventing fetal deaths.

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Area of Science:

  • Medical Genetics
  • Molecular Biology
  • Immunology

Background:

  • Polymerase chain reaction (PCR) is crucial for detecting the RHD gene and assessing RHD gene status in fetuses at risk for hemolytic disease of the newborn (HDN).
  • D gene variants can lead to inaccurate prenatal typing, potentially resulting in misclassification of fetuses as RhD-negative, which can cause intrauterine fetal demise.
  • Previous studies highlight the critical need for precise RHD gene detection to ensure accurate prenatal diagnosis and management.

Purpose of the Study:

  • To evaluate a PCR-based testing strategy for RHD gene detection and copy number assessment (zero, one, or two copies) in pregnancies at risk for HDN.
  • To assess the effectiveness of determining RHD gene dosage through PCR in family studies involving at-risk pregnancies.
  • To improve the accuracy of prenatal RhD typing and reduce the incidence of HDN.

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Main Methods:

  • Collected maternal (57), paternal (42), amniotic fluid (64), and cord blood (64) samples.
  • Performed Rhesus (Rh) serotyping on all blood samples and RHD genotyping on DNA extracted from 199 samples.
  • Utilized PCR to amplify RHD gene exon 4 and exon 7, comparing RHD gene intensity to RHCE gene intensity for dosage determination.

Main Results:

  • Achieved 100% concordance between RHD serotypes and genotypes for 135 blood samples.
  • Observed 100% concordance between RHD genotypes from amniotic fluid and Rh D serotypes from cord blood.
  • Successfully identified a case of mild HDN antenatally due to an abnormal D gene variant, enabling successful pregnancy management.

Conclusions:

  • PCR is effective for clinical RHD gene testing and dosage determination.
  • Testing multiple RHD gene regions (e.g., exon 4 and exon 7) is essential for accurate genotyping.
  • Implementing a testing strategy that includes maternal and paternal RHD gene dosage analysis is crucial for preventing HDN.