Good news!
"Highlights
- Salk scientists have created a platform to study mitochondrial DNA mutations that lead or contribute to human disease
- They generated a library of 155 mitochondrial DNA mutant cells, nearly the human level of mitochondrial DNA mutant diversity
- The platform and library will accelerate innovation in the mitochondrial disease therapeutic space
...
“Mitochondrial DNA accumulates mutations at a high rate, and more than 260 inherited disease-causing mtDNA mutations have been identified in humans,” ..."
From the significance and abstract:
"Significance
Mitochondrial DNA (mtDNA) accumulates mutations at a high rate, and more than 260 pathogenic germline mtDNA mutations have been identified in humans, producing diverse and often tissue-specific disorders.
In addition, numerous population-specific mtDNA variants have arisen through evolution and may influence adaptation and disease susceptibility.
However, the lack of animal models representing this diversity has limited mechanistic insight and therapeutic development.
Our scalable embryonic stem (ES) cell–based platform enables efficient generation of mouse models carrying functional mtDNA mutations across a broad spectrum of physiological effects. This resource will facilitate systematic investigation of mtDNA variation in health, disease, and evolution, and accelerate efforts to develop treatments for mitochondrial disorders.
Abstract
Mitochondria are central to energy metabolism and cellular signaling, and mutations in mitochondrial DNA (mtDNA) can disrupt these processes and contribute to human disease.
However, progress in defining how mtDNA variation influences adaptation, pathophysiology, and disease susceptibility has been limited by the lack of suitable animal models. Although recent base-editing approaches enable direct mtDNA modification, their low efficiency restricts the generation of diverse models reflecting human mtDNA variation.
Here, we develop a scalable embryonic stem (ES) cell–based platform for efficient production of mtDNA mutant mice. Random mutagenesis using an error-prone mtDNA polymerase generates a broad spectrum of mtDNA mutations, which are transferred into ES cells via a multiplexed cybrid fusion strategy coupled with sensitive mutation detection.
Optimized ES cell–embryo aggregation enables robust contribution of mtDNA mutant ES cells to host embryos, producing chimeric mice with germline transmission.
Using this platform, we generate a library of 155 donor fibroblast lines carrying distinct homoplasmic single-nucleotide mtDNA mutations that produce diverse mitochondrial phenotypes, including impaired oxidative phosphorylation, increased reactive oxygen species, and altered mitochondrial membrane potential. We further generate 34 female C57BL/6 ES cell lines harboring 18 mtDNA mutations across a range of heteroplasmy levels, yielding multiple chimeric mice and achieving germline transmission for one mutation.
These data reveal a strong correlation between mitochondrial function and early embryonic development, suggesting a minimal energetic threshold required for normal development. This scalable resource enables systematic investigation of mtDNA variation in physiology, adaptation, disease mechanisms, and therapeutic development."
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