Effects of embryonic manipulation and epigenetics

Area of Science:

• Developmental Biology
• Epigenetics
• Reproductive Medicine

Background:

• Assisted reproductive technologies (ART), including in vitro fertilization (IVF) and intracytoplasmic sperm injection (ICSI), are crucial for human and animal reproduction.
• While effective, concerns exist regarding potential epigenetic alterations induced by these manipulation techniques during early development.
• Mammalian early development involves significant epigenetic remodeling, with distinct sperm and oocyte profiles and allelic differences post-fertilization.

Purpose of the Study:

• To review the impact of embryonic manipulation procedures on epigenetic asymmetry during early mammalian development.
• To explore how techniques like IVF and ICSI interact with the natural epigenetic reprogramming occurring from fertilization to implantation.
• To highlight the significance of epigenetic regulation in preimplantation embryos for understanding broader epigenetic principles.

Main Methods:

• Literature review focusing on studies investigating epigenetic changes following IVF and ICSI.
• Analysis of research on epigenetic reprogramming dynamics in mammalian preimplantation embryos.
• Synthesis of findings on allelic differences and epigenetic asymmetry in early development.

Main Results:

• Embryonic manipulation techniques like IVF and ICSI are associated with potential epigenetic modifications.
• The critical window of fertilization to implantation is susceptible to epigenetic alterations due to these procedures.
• Epigenetic asymmetry, characterized by differing sperm and oocyte profiles and post-fertilization remodeling, is a key factor influenced by ART.

Conclusions:

• Embryonic manipulation techniques require careful consideration of their potential epigenetic consequences.
• Understanding epigenetic asymmetry in early development is vital for assessing the safety and efficacy of ART.
• Further research is needed to fully elucidate and mitigate the epigenetic risks associated with assisted reproduction.