Segregation of mtDNA Throughout Human Embryofetal Development: m.3243A > G as a Model System
Author Information
Author(s): Monnot Sophie, Gigarel Nadine, Samuels David C, Burlet Philippe, Hesters Laetitia, Frydman Nelly, Frydman René, Kerbrat Violaine, Funalot Benoit, Martinovic Jelena, Benachi Alexandra, Feingold Josué, Munnich Arnold, Bonnefont Jean-Paul, Steffann Julie
Primary Institution: Université Paris-Descartes, Unité INSERM U781, and Hopital Necker-Enfants Malades (Assistance Publique-Hopitaux de Paris)
Hypothesis
Is the segregation of the m.3243A > G mutation governed by random genetic drift during human embryofetal development?
Conclusion
The study found that mutant mtDNA segregation is governed by random genetic drift throughout human embryofetal development.
Supporting Evidence
- Mutant mtDNA segregation was found to be governed by random genetic drift during oogenesis and somatic tissue development.
- The size of the bottleneck operating for m.3243A > G during oogenesis was shown to be individual-dependent.
- Comparison with data for the m.8993T > G mutation indicates that these mutations differentially influence mtDNA segregation during oogenesis.
- None of the embryos were homoplasmic mutant, and heteroplasmy levels ranged from 5 to 77%.
- All fetuses but one were found to carry a heteroplasmy rate below 80%.
Takeaway
This study looked at how a specific mutation in mitochondrial DNA is passed from mothers to their babies during pregnancy, finding that it happens randomly.
Methodology
The study tracked the segregation of the m.3243A > G mutation using tissues and cells from eight carrier females, their 38 embryos, and 12 fetuses.
Potential Biases
Potential bias in the selection of carrier females and the interpretation of prenatal diagnosis results.
Limitations
The study's sample size is relatively small, and the findings may not be generalizable to all mitochondrial mutations.
Participant Demographics
Eight carrier females from seven unrelated families were included in the study.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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