MORC2 Protein Silences Genes via Liquid Condensates

MORC2 is a protein involved in switching off genes and maintaining the stability of genetic material (DNA). It is active in the cell nucleus and plays a role in organising chromatin (the structure in which DNA is packaged). Exactly how it does this was not previously understood.

The researchers showed that MORC2 forms biomolecular condensates, also called liquid-liquid phase-separated assemblies. These are not solid structures but dynamic clusters of proteins and RNA that temporarily come together and then disperse. The formation of these condensates turned out to be essential for MORC2’s function as a gene repressor.

What do condensates have to do with aging?

Biomolecular condensates have attracted considerable attention in recent years. They play a role in gene regulation, stress response and the formation of protein aggregates found in neurodegenerative diseases such as ALS and Alzheimer’s. As cells age, the way condensates form and dissolve changes. That can lead to disrupted gene regulation.

If MORC2 depends on condensate formation to silence genes, the question becomes what happens when that process functions less well during aging. Disrupted MORC2 function has already been linked to certain forms of neuropathy (nerve damage) in humans.

Dynamic, not static

A key insight from the research is that MORC2 condensates are dynamic. They are not permanently present but form at specific moments and locations within the cell nucleus. The researchers confirmed this in neurons from mice, suggesting the mechanism is physiologically relevant rather than merely a laboratory observation.

This opens new directions for research into diseases involving MORC2. It also illustrates how fundamentally different cell biology looks compared to twenty years ago: less fixed, more fluid.

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