Sperm DNA damage causes genomic instability in early embryonic development.

Area of Science:

• Reproductive Biology
• Genetics
• Developmental Biology

Background:

• Genomic instability is frequently observed in human embryos.
• The causes of embryonic genomic instability are not well understood.
• Sperm DNA damage is a potential contributor to genomic instability.

Purpose of the Study:

• To investigate the effects of sperm DNA damage on the embryonic genome.
• To analyze the consequences of radiation-induced sperm DNA damage on early embryonic development.

Main Methods:

• Single-cell whole-genome sequencing of bovine embryo blastomeres.
• Production of bovine embryos using sperm damaged by gamma radiation.

Main Results:

• Sperm DNA damage leads to paternal chromosome fragmentation and random distribution of fragments.
• Sperm DNA damage induces unequal cell cleavages and heterogoneic divisions.
• Embryos from damaged sperm exhibit chaotic mosaicism, including aneuploidies, uniparental disomies, and structural variations.

Conclusions:

• Sperm DNA damage is a significant source of embryonic genomic instability and mosaicism.
• This instability can compromise fertility and potentially lead to congenital disorders.
• Understanding these mechanisms is crucial for reproductive health.