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Haploidy in preattachment bovine embryos
Canadian Journal of Genetics and Cytology. Journal Canadien De Genetique Et De Cytologie
|February 1, 1985
Summary
Haploid cells were found in four bovine embryos, with two showing male origins. This suggests potential contamination or unusual cell division in early bovine embryo development.
Area of Science:
- Reproductive biology
- Developmental biology
- Genetics
Background:
- Chromosome analysis is crucial for understanding embryo viability.
- Early embryonic development in cattle can exhibit complex cellular behaviors.
- The presence of haploid cells in diploid embryos requires investigation.
Purpose of the Study:
- To investigate the occurrence and origin of haploid cells in early bovine embryos.
- To determine if these haploid cells are of maternal or paternal origin.
- To assess the implications of haploid cells for embryo development.
Main Methods:
- Chromosome analysis of 24 bovine embryos at days 5-7 of development.
- Metaphase spread analysis to identify cellular ploidy.
- Karyotyping and Y-chromosome specific probes to determine cell origin.
Main Results:
- Four out of 24 bovine embryos exhibited haploid cells in metaphase.
- Two embryos displayed a mix of haploid and diploid cells (n/2n).
- In two cases, haploid cells were identified as male, indicated by the Y chromosome.
Conclusions:
- The presence of male haploid cells suggests potential contamination by spermatozoa.
- This finding highlights the importance of rigorous controls in embryo analysis.
- Further research is needed to understand the mechanisms behind haploid cell presence in bovine embryos.