Scientists at the Salk Institute announced on Apr. 6 the creation of a new biological platform designed to study mitochondrial DNA and its effects on physiology, disease mechanisms, and potential therapies. The team has used this technology to build a library of 155 mutant cell lines with different mitochondrial DNA mutations, aiming to accelerate research into disorders linked to these genetic changes.
Mitochondria play a crucial role in powering cells, and their unique DNA can influence human health in significant ways. The ability to better understand how mitochondrial DNA mutations contribute to diseases could lead to improved treatments for conditions ranging from inherited disorders to cancer and age-related illnesses.
Ronald Evans, PhD, senior and co-corresponding author of the study published in Proceedings of the National Academy of Sciences, said: "Mitochondrial DNA accumulates mutations at a high rate, and more than 260 inherited disease-causing mtDNA mutations have been identified in humans. Until now, a lack of models representing this diversity has limited mechanistic insight and therapeutic development. Our new platform will allow scientists to investigate mitochondrial DNA variation in health, disease, and evolution, which will enable therapeutic innovation for mitochondrial disorders."
The research addresses previous challenges where creating mouse models with specific mitochondrial mutations was slow—sometimes taking years for each model. Weiwei Fan, PhD, first author on the paper and co-corresponding author said: "This new work is all building off an original platform I generated during my PhD. That platform was inefficient—it took a long time to generate just one mitochondrial DNA mutant. With some technological improvements and modifications, this new platform is much more efficient and can create dozens of mutants with far greater ease." Using their approach involving stem cells integrated with mutated mitochondrial DNA polymerase-generated sequences into mouse embryos allowed them not only speed but also diversity similar to known human mutation rates.
Fan added: "Our library is a huge milestone and is very diverse, with a scale of diversity similar to the known human disease-causing mutation diversity of around 260... And with this collection of mutant cells we can not only look at inherited mutations but also at ones that occur based on other stresses like environmental cues or aging." Evans concluded: "Progress in this field has been limited but this new platform is going fuel so much important research that points toward therapeutic approaches... as well as diseases or conditions associated with mitochondrial dysfunction like cancer or aging."
