Mitochondrial replacement techniques to resolve mitochondrial dysfunction and ooplasmic deficiencies: where are we...

Area of Science:

• Cell Biology
• Reproductive Medicine
• Genetics

Background:

• Mitochondria are vital for oocyte competence, fertilization, and embryo development.
• Maternal mitochondrial DNA (mtDNA) mutations cause disorders, ovarian aging, and infertility.
• Mitochondrial replacement techniques (MRTs) aim to correct mtDNA defects and improve IVF outcomes.

Purpose of the Study:

• To review the current state of MRTs for low oocyte quality due to mitochondrial dysfunction.
• To discuss heterologous and autologous MRT approaches.
• To evaluate the potential of novel stem cell-based autologous techniques.

Main Methods:

• Review of existing literature on mitochondrial replacement techniques.
• Comparison of heterologous (donor) and autologous (patient-derived) mitochondrial transfer methods.
• Analysis of specific techniques like germinal vesicle, pronuclear, maternal spindle, polar body transfer, and AUGMENT.

Main Results:

• Heterologous MRTs face ethical concerns regarding third-party genetic material and heteroplasmy.
• The autologous AUGMENT technique showed no significant benefit over conventional IVF in an RCT.
• Novel autologous stem cell approaches show promise but require further validation.

Conclusions:

• MRTs offer potential solutions for infertility linked to mitochondrial dysfunction.
• Robust evidence from further randomized clinical trials is essential for clinical adoption.
• Established MRTs could enable genetically related embryos for affected patients.