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Predictive diagnosis for polycystic kidney disease using DNA markers
J C Mulley1, E A Haan, A K Gedeon
1Adelaide Children's Hospital, North Adelaide, SA.
The Medical Journal of Australia
|March 19, 1990
Summary
DNA markers flanking the polycystic kidney disease 1 (PKD1) gene enable accurate genetic risk assessment. These markers significantly reduce the probability of carrying the PKD1 gene for individuals and can predict fetal risk during pregnancy.
Area of Science:
- Genetics
- Molecular Biology
- Medical Genetics
Background:
- Autosomal dominant polycystic kidney disease (ADPKD) is a common inherited disorder.
- The PKD1 gene is responsible for the majority of ADPKD cases.
- Accurate genetic prediction is crucial for family planning and early intervention.
Purpose of the Study:
- To evaluate the utility of flanking DNA markers for tracking PKD1 gene transmission.
- To assess the accuracy of presymptomatic and prenatal prediction of PKD1.
- To refine genetic risk assessment in families with ADPKD.
Main Methods:
- Analysis of two DNA markers (5'HVR and 24-1 probes) flanking the PKD1 gene.
- Segregation analysis of markers and the disease gene in two families.
- Calculation of reduced genetic risk probabilities based on marker informativeness.
Main Results:
- The 5'HVR and 24-1 markers are located proximally and distally to the PKD1 gene, respectively.
- DNA marker analysis accurately predicted disease gene carrier status, reducing risk from 50% to 0.006% in one individual.
- In a future pregnancy, fetal risk could be refined to 0.008% or 99.99% based on maternal marker inheritance.
Conclusions:
- Flanking DNA markers provide highly accurate tools for presymptomatic and prenatal diagnosis of PKD1.
- These markers significantly improve genetic counseling and risk assessment for families affected by ADPKD.
- The established marker linkage allows for precise prediction of disease inheritance, minimizing uncertainty.