Abstract
Mitochondrial DNA mutations transmitted maternally within the oocyte cytoplasm often cause life-threatening disorders. Here we explore the use of nuclear genome transfer between unfertilized oocytes of two donors to prevent the transmission of mitochondrial mutations. Nuclear genome transfer did not reduce developmental efficiency to the blastocyst stage, and genome integrity was maintained provided that spontaneous oocyte activation was avoided through the transfer of incompletely assembled spindle–chromosome complexes. Mitochondrial DNA transferred with the nuclear genome was initially detected at levels below 1%, decreasing in blastocysts and stem-cell lines to undetectable levels, and remained undetectable after passaging for more than one year, clonal expansion, differentiation into neurons, cardiomyocytes or β-cells, and after cellular reprogramming. Stem cells and differentiated cells had mitochondrial respiratory chain enzyme activities and oxygen consumption rates indistinguishable from controls. These results demonstrate the potential of nuclear genome transfer to prevent the transmission of mitochondrial disorders in humans.
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Acknowledgements
We thank S. Chang and K. Eggan for discussions, Z. Hall for critical reading of the manuscript, and L. Yu and O. Nahum for SNP-array preparation. We thank anonymous oocyte donors for participating in research, and M. Spencer for a Lykos laser system. This work was supported by the New York Stem Cell Foundation, the New York State Stem Cell Science award C026184, and the Bernard and Anne Spitzer Fund.
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M.V.S. consented oocyte donors and retrieved oocytes. R.P. contributed IVF developmental data. R.S.G. and M.V.S. wrote institutional review board and consent documents. D.E., D.P. and S.N. designed and performed experiments with oocytes. D.P. and V.E. determined heteroplasmy. N.T. performed array analysis of single cells. D.E., D.P., V.E., L.S., K.A.W., H.H., M.Z. and D.J.K characterized stem-cell lines. D.E., D.P., V.E. and M.H. wrote the paper.
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Supplementary Information
This file contains Supplementary Figures 1-9, Supplementary Tables 1-8 and Supplementary Karyotypes. (PDF 41490 kb)
SwaPS1 cardiomyocytes
This video shows a contracting embryoid body that had undergone directed differentiation toward a cardiac (mesodermal) lineage. (MOV 949 kb)
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Paull, D., Emmanuele, V., Weiss, K. et al. Nuclear genome transfer in human oocytes eliminates mitochondrial DNA variants. Nature 493, 632–637 (2013). https://doi.org/10.1038/nature11800
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DOI: https://doi.org/10.1038/nature11800
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