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Related Experiment Videos

Risk estimates for balanced reciprocal translocation carriers--prenatal diagnosis experience

I Barisić1, L Zergollern, D Muzinić

  • 1Department of Pediatrics, Children's Hospital Zagreb, Croatia.

Clinical Genetics
|March 1, 1996
PubMed
Summary

Reciprocal translocations in parents pose a risk of unbalanced rearrangements in offspring. Individual risk assessment is crucial for genetic counseling, as ascertainment methods alone are unreliable predictors.

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Area of Science:

  • Genetics
  • Prenatal Diagnosis
  • Reproductive Medicine

Background:

  • Parental reciprocal translocations are a known risk factor for fetal unbalanced rearrangements.
  • Accurate risk assessment is vital for genetic counseling and reproductive decision-making.

Purpose of the Study:

  • To analyze the risk of unbalanced fetal rearrangements in families with a parent carrying a reciprocal translocation.
  • To evaluate the reliability of ascertainment methods and imbalance measurements for predicting individual risks.

Main Methods:

  • Analysis of 40 families with a parent carrying a reciprocal translocation.
  • Estimation of individual risks for unbalanced offspring at second-trimester prenatal diagnosis and birth using empirical data.
  • Categorization of translocations based on risk levels (low, medium, high, no risk).

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Main Results:

  • Overall risk of unbalanced rearrangement at second-trimester prenatal diagnosis was 14%.
  • Birth risks ranged from 0% to 21.6%, with most translocations being low risk.
  • Ascertainment method and imbalance measurement were found to be unreliable risk predictors.

Conclusions:

  • Individual risk estimation is essential for genetic counseling of parents with reciprocal translocations.
  • Translocations ascertained through spontaneous abortions may have small or no risk, but exceptions exist.
  • Translocations identified through unbalanced offspring generally belong to various risk groups, excluding the 'no risk' category.