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Updated: May 19, 2026
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Using Mouse Oocytes to Assess Human Gene Function During Meiosis I
Published on: April 10, 2018
Genetic and physiological study of morphologically abnormal human zona pellucida
Michal Margalit1, Gedalia Paz, Haim Yavetz
1Institute for Study of Fertility and Racine IVF Unit, Lis Maternity Hospital, Tel Aviv Sourasky Medical Center, Sackler Faculty of Medicine, Tel Aviv University, 6 Weizman Street, Tel Aviv 64239, Israel.
Summary
Genetic analysis revealed no mutations in zona pellucida (ZP) genes in women with abnormal oocyte appearance. Despite low ZP3 staining, normal sperm binding and good pregnancy outcomes were observed with intracytoplasmic sperm injection.
Area of Science:
- Reproductive biology
- Human genetics
- Oocyte development
Background:
- The zona pellucida (ZP) is crucial for mammalian fertilization.
- Abnormal oocyte morphology can impact fertility.
- Understanding ZP gene function is vital for reproductive medicine.
Observation:
- Investigated genetic, molecular, and functional aspects of the human zona pellucida (ZP) in oocytes with abnormal appearance.
- Sequenced ZP genes (ZP1-4) and ZP3 regulatory element in three women with unexplained infertility and abnormal oocytes.
- Performed immunofluorescence staining and hemizona assay on oocytes.
Findings:
- No causative mutations were found in ZP1, ZP2, ZP3, or ZP4 genes.
- Observed normal sperm binding to ZP despite weak ZP3 protein staining.
- Intracytoplasmic sperm injection resulted in good pregnancy outcomes.
Implications:
- Abnormal oocyte ZP appearance in these cases was likely not due to genetic defects in ZP genes.
- ZP3 protein levels may play a less critical role than previously thought in sperm binding and fertilization.
- Abnormal oocyte morphology does not necessarily predict reduced fertilization or birth rates in ICSI cycles.
