AI Insight
This study investigates how mitochondrial DNA mutations, specifically in the mtND6 gene encoding a subunit of Complex I of the electron transport chain, affect nutrient utilization in human pluripotent stem cells. The researchers found that these mutations cause cells to shift their primary energy source from glucose to fatty acids, which in turn amplifies the cellular response to BMP4, a signaling molecule that governs germ layer formation during early embryonic development. Using human gastruloid models, they demonstrated that this metabolic shift disrupts normal tissue patterning, suggesting that mitochondrial activity regulates embryonic organization by modulating how cells process and respond to nutritional and developmental signals.
Why it matters
Mitochondrial DNA mutations affect a significant portion of the population and are associated with serious developmental and metabolic disorders, so understanding how these mutations interfere with early embryonic patterning could inform the development of therapeutic strategies and improve our understanding of congenital conditions linked to mitochondrial dysfunction.
⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
There is increasing awareness that nutrient uptake and utilization play key roles in determining cell fate specification during development. Mitochondria integrate these nutrient inputs translating them into energy and signals. Mitochondrial DNA mutations that disrupt mitochondrial activity cause disease and disability. How they impact the role of nutrients in developmental decision making remains poorly understood. Here we find that in human pluripotent stem cells, mutations in mtND6, a component of Complex I of the electron transport chain, induce a switch in the uptake of nutrients that sustain proliferation, from glucose to fatty acids. Importantly, this switch leads to an enhanced response to BMP4, the signal that directs germ layer self-organization in gastruloids, causing disrupted patterning in these models. These results demonstrate that by determining the mode of nutrient uptake, mitochondrial activity fine tunes the cells’ signalling output to direct proper embryo organization, and that this process is compromised by disease causing mutations.
Source: Mitochondrial activity directs nutrient uptake and patterning in human gastrula models.