Single-Cell Spatial Proteomics Uncovers Molecular Interconnectivity Among Hallmarks Of Aging
Aging is a complex process characterized by several “hallmarks,” which are fundamental cellular and molecular changes like damage to our genetic material (genomic instability), alterations in how our genes are regulated (epigenetic alterations), and problems with how our cells manage their proteins (loss of proteostasis), and issues with the cell’s energy factories (mitochondrial dysfunction). While we know these hallmarks exist, how they are connected and emerge over time has been less clear.
Recent research has shed light on these connections by using a powerful technique called single-cell spatial proteomics. This method allows scientists to look at all the proteins within individual cells and pinpoint their exact locations. By applying this to aging yeast cells, researchers created a detailed map of how proteins change in terms of their expression, where they are located, and if they clump together as cells age.
The findings were remarkable, uncovering hundreds of previously unknown molecular changes linked to the hallmarks of aging. It turns out that many aging-related issues manifest as proteins losing their normal spatial organization within the cell, moving to incorrect places, or forming aggregates. Importantly, the study also found that a significant majority (91.6%) of the human versions of these yeast proteins show similar changes during human aging, suggesting these mechanisms are broadly conserved across species.
Furthermore, the research identified many molecular links between different hallmarks of aging. Temporal analysis, which looks at changes over time, suggested a hierarchy: problems with the production of ribosomes (the cell’s protein-making machinery) in the nucleolus, a decline in protein management (proteostasis), and mitochondrial dysfunction appear to occur before other hallmarks. This work provides a deeper understanding of the molecular basis of aging and offers a framework for how these cellular failures might be linked in a sequential manner.
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