Epigenetics

Your DNA is the blueprint. Your epigenome decides which pages get read. Every cell carries the same DNA — but a liver cell, a neuron, and a skin cell are profoundly different. The difference is which genes are switched on, and which are silenced. Epigenetics is the layer of chemical marks that controls those switches without rewriting the DNA itself.

One of the main switches is histone methylation. Histones are the protein spools that your DNA wraps around. A class of enzymes called histone methyltransferases (HMTs) attach methyl tags to precise spots on the histones — and the tags tell the cell whether to read the wrapped DNA or skip it.

When the wrong HMT methylates the wrong spot, the wrong genes get switched on. Several cancers run on this failure. The NSD family — NSD1, NSD2, NSD3 — drives childhood leukemia, multiple myeloma, prostate, breast, and lung cancers. Targeting them selectively is the open opportunity — and a hard one, because the enzymes have flexible loops that don't sit still long enough for traditional treatment design.

That's where Folding@home comes in. The Chodera lab at Memorial Sloan Kettering, in collaboration with the Luo lab, simulates how NSD1, NSD2, NSD3, and SETD2 actually move — millisecond by millisecond — mapping the conformations and proposing molecules that can bind one HMT selectively without disrupting the rest.

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