Mitochondrial Dynamics in Cellular Function and Disease

Mitochondria are highly dynamic organelles that undergo continual cycles of fission and fusion, orchestrating their shape, distribution and functional capacity within the cell. These dynamic transitions enable adaptation to metabolic demands, facilitate quality control through segregation and removal of damaged regions, and regulate vital processes such as energy production, calcium signalling and programmed cell death. The balance between division and merging of mitochondrial networks underpins cellular resilience: fusion allows complementation of mitochondrial genomes and maintenance of membrane potential, whereas fission promotes turnover of dysfunctional fragments via mitophagy. Emerging studies have also highlighted the role of mitochondrial contacts with the endoplasmic reticulum in lipid transfer and calcium exchange, as well as the formation of mitochondrial-derived vesicles that shuttle cargo to lysosomes or other compartments. Dysregulation of these dynamics contributes to a spectrum of human diseases, including neurodegenerative disorders, metabolic syndromes, cardiovascular pathologies and cancer. Understanding the molecular machinery—comprising large GTPases, adaptor proteins and quality-control pathways—and its modulation in health and disease is opening avenues for targeted therapies that restore dynamic balance and organellar integrity.

Research from Nature Portfolio

Foundational work has delineated the molecular basis of endoplasmic reticulum–mitochondria tethering controlled by interactions between a VAPB adaptor on the ER membrane and a PTPIP51 partner on the mitochondrial surface. This mechanism establishes specialised contact zones that coordinate calcium flux and lipid exchange, essential for mitochondrial bioenergetics and signalling. Pathogenic forms of a neuronal RNA-binding protein disrupt this tether, leading to aberrant calcium handling, activation of a kinase that further destabilises the organellar interface and contributes to neurodegenerative cascades. Restoration of the tethering interaction emerges as a potential strategy to protect against neuronal loss and maintain cellular homeostasis.

Mitochondrial Dynamics in Cellular Function and Disease publication trend

The graph below shows the total number of articles in mitochondrial dynamics in cellular function and disease across all publications each year (not limited to Nature Index journals).

Technical terms

Mitochondrial fission: Division of a single mitochondrion into two daughter organelles, mediated by dynamin-related proteins to facilitate distribution and removal of damaged regions.

Mitochondrial fusion: The merging of mitochondrial membranes to form an interconnected network, driven by GTPases that support metabolic efficiency and genetic complementation.

Mitophagy: Selective autophagic degradation of dysfunctional mitochondria, preventing accumulation of damaged organelles and maintaining cellular homeostasis.

ER–mitochondria contact sites: Regions of close apposition between the endoplasmic reticulum and mitochondria, enabling lipid exchange, calcium signalling and coordination of organellar dynamics.

Mitochondrial-derived vesicles (MDVs): Small vesicles budding from mitochondria that carry specific cargoes to lysosomes or other organelles, contributing to sub-organellar quality control and intercellular communication.

References

1. Mitochondrial dynamics in health and disease: mechanisms and potential targets. Signal Transduction and Targeted Therapy (2023).
2. MTFP1 controls mitochondrial fusion to regulate inner membrane quality control and maintain mtDNA levels. Cell (2024).
3. Mitochondrial-derived vesicles in metabolism, disease, and aging. Cell Metabolism (2024).
4. ER–mitochondria associations are regulated by the VAPB–PTPIP51 interaction and are disrupted by ALS/FTD-associated TDP-43. Nature Communications (2014).