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Nude mouse embryo: ectodermal nature of the primordial thymic defect
Scandinavian Journal of Immunology
|January 1, 1975
Summary
Sterile female nude mice, lacking a thymus, were made fertile by thymic grafts. This study investigates the developmental defect in nude mouse embryos, revealing abnormal 3rd branchial cleft development.
Area of Science:
- Developmental biology
- Immunology
- Mouse models
Background:
- Homozygous nude mice are typically sterile due to thymus agenesis.
- The underlying embryological defect in nude mice is not fully understood.
Purpose of the Study:
- To investigate the embryological basis of sterility in homozygous nude mice.
- To characterize the developmental anomaly in nude mouse embryos.
Main Methods:
- Grafting of thymic epithelium from heterozygous littermates into newborn homozygous nude mice.
- Comparative analysis of homozygous nude embryos and control embryos (8-18 days of gestation).
Main Results:
- Grafting restored fertility in female homozygous nude mice.
- An embryological anomaly was observed in nude mouse embryos from day 11 of gestation.
- The anomaly involves failed ectodermal proliferation from the 3rd branchial cleft, leading to cervical vesicle malformation and degeneration of the 3rd pouch endoderm into cystic structures.
Conclusions:
- Thymic epithelium transplantation can restore fertility in nude mice.
- The sterility in nude mice is linked to a specific defect in 3rd branchial cleft development during embryogenesis.