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Congenital heart defects and twinning
Acta Geneticae Medicae Et Gemellologiae
|January 1, 1984
Summary
Identical twins (monozygotic) have a higher risk of congenital heart defects compared to fraternal twins and singletons. The study suggests twinning processes, like disturbed laterality, may cause these cardiovascular malformations.
Area of Science:
- Developmental Biology
- Cardiovascular Genetics
- Twin Studies
Background:
- Congenital heart defects (CHDs) are a significant concern in infant health.
- Previous twin studies have yielded varied conclusions regarding genetic and environmental factors in CHD etiology.
- Understanding the specific risks associated with different twin types is crucial for etiology research.
Purpose of the Study:
- To investigate the overrepresentation of monozygotic (MZ) twins among individuals with heart defects.
- To explore potential mechanisms contributing to cardiovascular malformations in twins.
- To re-evaluate the role of genetic and epigenetic factors in CHD.
Main Methods:
- Analysis of twin and triplet cases with heart defects across five research centers.
- Exclusion of specific conditions like persistent ductus arteriosus and conjoined twins.
- Comparative risk assessment between monozygotic twins, dizygotic twins, and singletons.
Main Results:
- Monozygotic (MZ) twins are significantly overrepresented among twins with heart defects.
- Individuals who are MZ twins have approximately double the risk of cardiovascular malformation compared to DZ twins and singletons.
- Disturbance of laterality (mirror imaging) is proposed as a more significant factor than twin-twin transfusion.
Conclusions:
- The twinning process itself may influence the development of heart defects in one twin.
- Past underestimation of genetic factors in CHD etiology may stem from inappropriate application of twin study methodologies.
- Twin studies remain valuable for illustrating the role of epigenetic factors in cardiac development.