A single change in a histone loop rewires how a cell talks to its own membrane.

Inside cells, spool-shaped protein complexes called nucleosomes package DNA and control access to it. Scientists suspected these spool proteins, called histones, might do more than just manage DNA, but they did not know the full extent. To test this, researchers altered the six-residue loop 2 region in two related histones, H2A and H2A.Z, changing one building block at a time. By testing how these tiny changes altered cell systems, they discovered hundreds of connections. Remarkably, the changes affected functions far from DNA, such as the cell skeleton, endocytosis, and moving materials inside the cell. These single-residue changes barely shifted gene activity, but they helped cells survive stress to their outer walls and membranes. Histones can directly guide cellular processes beyond DNA.

Why it matters

For decades, histones were seen as spools that package DNA, nothing more. This paper shows that swapping one amino acid in a histone can alter how a cell handles its outer wall and membrane, which matters for understanding how cells evolve new traits and how mutations in core proteins can have effects far beyond the nucleus.

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