PLOS Genetics study dissects how chromatin insulators homie and nhomie mediate long-range chromosomal interactions

A study published in *PLOS Genetics* on 5 June 2026 by Miki Fujioka, Wenfan Ke, Paul Schedl, James B. Jaynes, and colleagues examines the functional logic of the Drosophila chromatin insulator elements *homie* and *nhomie*.

Chromatin insulators — also termed boundary elements — separate chromosomal regions with distinct chromatin characteristics, including different histone modification profiles. They block inappropriate enhancer–promoter interactions and, paradoxically, can also facilitate interactions over long distances by pairing with specific partner elements, effectively stitching distant chromosomal regions together. The molecular rules governing when insulators act as barriers versus bridges have been incompletely understood.

The new work shows that *homie* and *nhomie* can engage with distant copies of themselves either jointly or separately, and that these different interaction configurations produce distinct outcomes for enhancer–promoter communication in the surrounding chromosomal neighbourhood. The findings have implications for understanding how three-dimensional genome architecture is established and maintained, and how disruptions to insulator function might affect gene regulation. This work is relevant primarily to researchers in chromosome biology, gene regulation, and developmental genetics, and to educators teaching three-dimensional genome organisation.