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Autosomal reciprocal translocations and 13/14 translocations: a population study
Clinical Genetics
|September 1, 1976
Summary
Autosomal reciprocal translocations occur in 1.34 per 1,000 live births. While balanced forms are usually harmless, unbalanced translocations significantly increase risks of miscarriage and stillbirth.
Area of Science:
- Genetics
- Human Genetics
- Reproductive Genetics
Background:
- Autosomal reciprocal translocations are chromosomal abnormalities.
- Understanding their incidence and segregation is crucial for genetic counseling.
Purpose of the Study:
- To determine the incidence of autosomal reciprocal translocations in a Danish population.
- To investigate segregation rates and associated risks in carriers and their offspring.
Main Methods:
- Conducted an incidence study of chromosome aberrations in 11,148 liveborn infants.
- Analyzed familial cases, segregation rates, and pregnancy outcomes in translocation carriers.
Main Results:
- Identified 15 children with autosomal reciprocal translocations (1.34 per 1,000 births).
- Observed 60% segregation for balanced and 4% for unbalanced forms; 73% were familial.
- Carriers of balanced translocations showed no abnormalities, but their progeny had higher rates of abortions, stillbirths, and perinatal deaths.
Conclusions:
- Balanced autosomal reciprocal translocations do not typically cause abnormalities in carriers.
- Unbalanced translocations are often incompatible with fetal development, leading to pregnancy loss.
- Further studies are needed to estimate segregation rates for unbalanced derivatives in unselected populations.