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Centrioles in the beginning of human development
A H Sathananthan1, I Kola, J Osborne
1Centre for Early Human Development, Monash Medical Centre, Clayton, Australia.
Summary
Human oocytes contain centrioles derived from sperm, supporting paternal inheritance. This finding clarifies centriole origin and abnormal embryo development in dispermic human embryos.
Area of Science:
- Reproductive Biology
- Cell Biology
- Developmental Biology
Background:
- Centrioles are crucial for cell division and organization in most animals.
- The origin of centrioles in human reproduction has been debated, particularly in comparison to mouse models where they are maternally derived.
Purpose of the Study:
- To investigate the presence and origin of centrioles in fertilized human oocytes.
- To provide evidence for the paternal contribution of centrioles in humans.
- To explore the implications for understanding abnormal embryonic development.
Main Methods:
- Transmission electron microscopy (TEM) was used to visualize centrioles.
- Analysis focused on fertilized human oocytes at pronuclear and early cleavage stages.
- Embryos included normal, dispermic, and tripronuclear samples.
Main Results:
- Centrioles were detected within centrosomes at the spindle poles of the first cleavage spindle in human embryos.
- Sperm centrioles were observed associated with the male pronucleus in pronuclear stage embryos.
- A tripolar spindle in a tripronuclear embryo showed centrioles at one pole.
Conclusions:
- Human centrioles are paternally derived, aligning with Boveri's theory and contrasting with mouse models.
- This paternal origin supports the classical understanding of centriole inheritance in most animals.
- The findings offer insights into the mechanisms underlying aberrant cleavage patterns in dispermic human embryos.