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[Translocation 11q;22q: a clinico-cytogenetic study].
Genetika
|October 1, 1992
Summary
Translocations t(11; 22) often cause genetic imbalance due to nondisjunction during meiosis. Women carriers face higher risks of affected children than men carriers, with specific associated phenotypes observed.
Area of Science:
- Genetics
- Human Genetics
- Reproductive Genetics
Background:
- Reciprocal translocations, such as t(11; 22), are significant sources of reproductive risk.
- Understanding the mechanisms of genetic imbalance in translocation carriers is crucial for genetic counseling.
Purpose of the Study:
- To analyze the genetic imbalance resulting from t(11; 22) translocations.
- To investigate the differential risk for male versus female carriers.
- To characterize the phenotypic features of individuals with +der(22)t(11; 22).
Main Methods:
- Analysis of seven families with t(11; 22) translocations.
- Review of relevant scientific literature.
Main Results:
- Genetic imbalance in t(11; 22) is consistently due to 3:1 nondisjunction, predominantly in the first meiotic division.
- Female carriers exhibit a significantly higher risk of having an imbalanced child compared to male carriers due to prezygotic selection against sperm with an extra chromosome.
- Patients with +der(22)t(11; 22) present with a combination of trisomy 22q and trisomy 11q features, including cleft lip/palate, renal anomalies, and a high incidence of diaphragmatic hernias.
Conclusions:
- The 3:1 nondisjunction mechanism and sex-differential risk are key factors in t(11; 22) translocation outcomes.
- The specific phenotypic spectrum associated with +der(22)t(11; 22) provides diagnostic clues.