KRAB-ZFPs and the establishment of lineage- and species-specific gene regulatory networks

A family of 350 human and mouse proteins called KRAB-ZFPs has been largely ignored by scientists, but new evidence suggests they act as genetic dimmer switches, controlling when and where nearby genes turn on. These proteins were long thought to simply silence parasitic DNA fragments called transposable elements in embryonic stem cells. But the researcher has mapped where 222 human KRAB-ZFPs bind to DNA and found that many target ancient transposable elements that have been repurposed as regulatory platforms—control panels that influence the activity of neighbouring genes. The problem is that current theories cannot explain what most of these proteins actually do. This project aims to prove that KRAB-ZFPs use their ability to compact DNA into heterochromatin to physically block or expose these regulatory elements, thereby rewiring gene networks. The team will run large-scale enhancer screens across multiple cell types, then use genetic manipulation in mouse models to identify which biological processes are affected. This is fundamental science. It asks how organisms build species-specific gene regulatory networks—a question with no immediate practical application. But understanding how these proteins reshape gene activity could eventually illuminate why closely related species develop different traits, or how disruptions in these networks contribute to developmental disorders.