Migrating interphase DNA

Chien-Hui Chuang (University of Illinois, Urbana, IL) sees chromosomes moving long distances—and not during mitosis. Chuang, Andrew Belmont, and colleagues, now unveil the inducible long-range migration of an interphase chromosome site.

An hour or two after mitosis, chromosomes appear to be locked down, as only short-range, tethered diffusion-like movements had been seen during interphase. Yet several groups had noted that certain genes localize at the nuclear periphery when repressed but in the interior when active.

Chuang and colleagues visualized the movements accompanying this repositioning. They used an engineered locus that they could turn on through inducible targeting of a transcriptional activator. Upon transcription factor targeting, the group observed rapid, directed movements of the locus from the nuclear envelope toward the interior. The linear paths taken, often...