Can you explain how mitochondrial replacement therapy works and what pronuclear transfer involves? I’m particularly interested in how nuclear DNA is transferred between eggs and how this helps prevent mitochondrial diseases. Are there any key ethical or legal concerns surrounding this technique in different countries, and how widely is it currently used in clinical practice?
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Mitochondrial replacement therapy (MRT) is a technique to prevent transmission of mitochondrial diseases. It transfers nuclear DNA from a fertilized egg with faulty mitochondria into a donor egg with healthy mitochondria after removal of its nuclear DNA. This allows the embryo to retain parental genetic traits while avoiding defective mitochondria. The method is tightly regulated and raises ethical debates in many countries due to germline modification concerns. For more reading on reproductive technologies and international medical practice, the blog https://nccconline.org/directions/mitochondrial-donation offers useful overviews.