Related Experiment Videos
Isolation and microinjection of somatic cell-derived mitochondria and germline heteroplasmy in transmitochondrial
M H Irwin1, L W Johnson, C A Pinkert
1Department of Comparative Medicine, University of Alabama at Birmingham 35294-0019, USA.
Abstract:
At present, there are no means for creation of relevant animal models of human mitochondrial DNA (mtDNA)-based diseases in a directed fashion. As an initial step towards this end, we have developed a microinjection technique for transfer of isolated, viable mitochondria between two mouse species. Previously, we reported detection, by nested PCR with species-specific primer sets, of Mus spretus mtDNA in Mus musculus domesticus blastocyts following zygote microinjection and culture. We now report the production of transmitochondrial founder mice, and germline transmission of the heteroplasmic state in a maternal lineage. Heteroplasmic mice produced by this technique will be useful in the study of mitochondrial dynamics and may hasten the creation of animal models of human mtDNA-based diseases.
Insights
Researchers created transmitochondrial mice by transferring mitochondria between species. This technique enables germline transmission of mitochondrial DNA, paving the way for animal models of mitochondrial diseases.
Area of Science:
- Mitochondrial genetics
- Animal models
- Developmental biology
Background:
- Human mitochondrial DNA (mtDNA)-based diseases lack relevant animal models.
- Directed creation of such models is currently not feasible.
Purpose of the Study:
- To develop a microinjection technique for transferring isolated, viable mitochondria between mouse species.
- To establish a method for creating animal models of human mtDNA-based diseases.
Main Methods:
- Microinjection of isolated, viable mitochondria from Mus spretus into Mus musculus domesticus zygotes.
- Nested PCR with species-specific primers for mtDNA detection.
- Assessment of germline transmission of heteroplasmy in maternal lineages.
Main Results:
- Successful production of transmitochondrial founder mice.
- Demonstration of germline transmission of the heteroplasmic state through a maternal lineage.
- Detection of Mus spretus mtDNA in Mus musculus domesticus blastocysts.
Conclusions:
- The developed microinjection technique allows for the creation of heteroplasmic mice.
- These mice serve as a valuable tool for studying mitochondrial dynamics.
- This method facilitates the development of animal models for human mtDNA-based diseases.