Mapping the cell nucleus to understand aging
Inside every cell sits a nucleus containing three metres of DNA, folded with precision. How that folding changes with disease and aging has long been unclear. A new overview published in Science shows how far the field has come in charting this three-dimensional structure.
The way DNA is folded inside the nucleus is not random. Genes that need to be active are arranged differently from genes that are kept silent. This spatial organisation partly determines what kind of cell you are: a neuron, a heart muscle cell, or an immune cell. The researchers describe in Science how new technologies now allow scientists to study this three-dimensional genome organisation in healthy tissues at the level of individual cells.
What changes with aging?
As cells age, the spatial organisation of DNA becomes disrupted. Genes that should be silent become active. Genes that should be active get suppressed. This phenomenon, sometimes called epigenetic dysregulation or DNA aging, is considered a central driver of age-related disease. Building an accurate map of healthy genome organisation is a necessary first step: without knowing what it should look like, it is hard to measure what goes wrong.
A related article in the same issue of Science describes a human-body atlas of genome organisation and DNA methylation (a chemical tag on DNA indicating which genes are switched on or off) across cell types throughout the body. Together, these studies provide a reference framework for future research into how the cell nucleus changes with aging and disease.
From atlas to therapeutic targets
Mapping healthy genome organisation is not a treatment in itself. But it provides reference material against which diseased or aged tissue can be compared. Where structure deviates from the healthy baseline, therapeutic targets may lie. That is still a future prospect, but these atlases make the next step more concrete.
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