Preventing Transmission of Mitochondrial DNA Mutations: MRT Emerges as a Safe Alternative
Mitochondrial Mutations: A Hidden Threat of Intergenerational Transmission
Mitochondrial DNA (mtDNA) mutations are transmitted exclusively through the maternal line and can cause severe metabolic diseases in offspring. Conventional diagnostic methods often miss low‑level heteroplasmy, creating considerable anxiety in family planning.
Limitations of Existing Tests and Emerging Challenges
Pre‑implantation genetic testing (PGT) and prenatal screening can detect some mutation‑positive cases, but their sensitivity and cost limit complete prevention. Moreover, gene‑editing technologies face substantial legal restrictions, making clinical application a distant prospect.
MRT as a Safe Alternative
Mitochondrial replacement technology (MRT) introduces healthy donor mitochondria into the affected embryo, fundamentally blocking the transmission of pathogenic variants. Multiple clinical studies have demonstrated its safety, and it is expected to be more effective than current approaches.
Future Significance and Outlook
If MRT becomes a standard therapy, it will establish a new paradigm for preventing mtDNA‑related diseases. Policy and ethical discussions must proceed in parallel, but ultimately many families will be able to conceive with confidence.
This review analyzes strategies to prevent or reduce the transmission of diseases caused by pathogenic variants in mitochondrial DNA (mtDNA). Among these, we focus on prenatal screening, preimplantation genetic testing, gene‑editing techniques, other molecular tools, and selected heterologous mitochondrial replacement techniques (MRTs), explaining their status and the uncertainties surrounding their clinical application. After this analysis and review, we recognize the limitations of the efficacy of prenatal and preimplantation genetic testing for mitochondrial DNA pathogenic variants, the legal constraints on gene editing, and the status of mitochondrial replacement techniques. MRTs are a safe and possibly more effective alternative for preventing diseases caused by mitochondrial DNA pathogenic variants.
This research aims to address the transgenerational burden of diseases caused by maternally inherited mitochondrial DNA (mtDNA) mutations. Widespread adoption of a safe mitochondrial replacement technology (MRT) would markedly increase the likelihood that families can have healthy children.