Related Experiment Videos
Assisted reproductive technologies and monozygous twins: implications for future study and clinical practice
E S Sills1, M J Tucker, G D Palermo
1Georgia Reproductive Specialists LLC, Atlanta 30342, USA. dr.sills@ivf.com
Summary
The zona pellucida (ZP) may influence human twinning. Assisted reproductive technologies that alter the ZP, like IVF and ICSI, are linked to increased monozygotic (MZ) twins, but evidence remains debated.
Area of Science:
- Human embryology
- Reproductive medicine
- Genetics
Background:
- The zona pellucida (ZP) is crucial for early embryonic development.
- A hypothesis suggests ZP alterations may contribute to human twinning.
- Assisted reproductive technologies (ART) involve procedures that can modify the ZP.
Purpose of the Study:
- To explore the potential role of the zona pellucida in human twinning.
- To review the association between ZP manipulation and monozygotic (MZ) twin rates.
- To discuss the embryological mechanisms underlying conflicting observations.
Main Methods:
- Literature review of human ZP micro-manipulation and MZ twins.
- Analysis of embryological processes related to twinning.
- Discussion of evidence supporting and challenging the ZP-twinning link.
Main Results:
- ART procedures like in vitro fertilization (IVF), intracytoplasmic sperm injection (ICSI), and assisted hatching may alter the ZP.
- Preliminary reports suggest an increased frequency of MZ twins following ZP-breaching procedures.
- Conflicting evidence exists regarding the direct causal link between ZP manipulation and MZ twinning.
Conclusions:
- The precise role of the ZP in human twinning requires further investigation.
- Understanding ZP-ART interactions is crucial for reproductive medicine.
- Further research is needed to clarify the relationship between ZP manipulation and MZ twin incidence.