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Discordant monozygotic twins with trisomy 13
Acta Geneticae Medicae Et Gemellologiae
|January 1, 1985
Summary
This study reports rare monozygotic twins with trisomy 13, who showed differences in omphalocele presence despite identical karyotypes. Chromosomal abnormalities in identical twins may lead to such developmental variations.
Area of Science:
- Genetics
- Developmental Biology
- Twin Studies
Background:
- Monozygotic (MZ) twins share identical genetic material.
- Trisomy 13 is a severe chromosomal disorder.
- Discordance in MZ twins can provide insights into genetic and environmental influences.
Purpose of the Study:
- To report a rare case of monozygotic twins with trisomy 13.
- To explore reasons for the rarity of trisomy 13 in MZ twins.
- To investigate potential links between chromosomal abnormalities and dimorphism in MZ twins.
Main Methods:
- Case report of monozygotic twins.
- Karyotype analysis to confirm trisomy 13.
- Clinical examination to assess phenotypic differences.
Main Results:
- The monozygotic twins presented with typical trisomy 13.
- Despite an identical karyotype, one twin had an omphalocele, while the other did not (dimorphism).
- The study discusses factors contributing to the rarity of trisomy 13 in MZ twins.
Conclusions:
- The case highlights phenotypic variability even with identical karyotypes in trisomy 13.
- Chromosomal abnormalities in MZ twins might increase susceptibility to dimorphism.
- Further research is needed to understand the mechanisms underlying discordance in affected MZ twins.