The paternal toolbox for embryo development and health

Area of Science:

• Reproductive Biology
• Developmental Biology
• Genetics

Background:

• Sperm are crucial for restoring embryonic diploidy and specialized developmental functions.
• Sperm-borne phospholipase C-zeta (PLC-zeta) initiates oocyte activation via calcium oscillations.
• Sperm centrioles are essential for centrosome formation and accurate chromosome segregation during early embryonic divisions.

Purpose of the Study:

• To elucidate the multifaceted roles of sperm in embryonic development beyond fertilization.
• To highlight the impact of sperm DNA integrity and epigenetic factors on pre- and post-implantation development.
• To emphasize sperm function as a critical target for enhancing assisted reproduction technologies.

Main Methods:

• Review of existing literature on sperm function in fertilization and embryonic development.
• Analysis of the roles of sperm-borne factors like PLC-zeta and centrioles.
• Examination of the consequences of sperm DNA damage and epigenetic alterations on embryo viability.

Main Results:

• Sperm DNA damage, while not affecting fertilization via ICSI, leads to detrimental pre- and post-implantation effects.
• Sperm centrioles are vital for the fidelity of chromosome segregation in the first cell divisions.
• Epigenetic factors in sperm, including chromatin packaging and DNA methylation, significantly influence embryo quality and development.

Conclusions:

• Sperm's contribution to development extends far beyond fertilization, encompassing critical roles in embryonic genome activation, centrosome formation, and epigenetic regulation.
• Sperm DNA integrity and proper epigenetic programming are essential for successful embryonic and fetal development.
• Improving the assessment and optimization of sperm function is paramount for advancing the efficacy of assisted reproduction treatments.