PRP8 regulates chromatin organization to enforce transcriptional gene silencing independent of DNA methylation.
Qi L, Zhuo W, Chen G, Qu S, Wang B
Gene Silencing
Every tomato, pepper, and squash in your garden quietly battles its own genome — rogue DNA segments called transposable elements try to copy themselves and cause chaos, and plants have evolved layered systems to keep them locked down, even without the chemical locks scientists thought were essential.
Plants have a way of permanently silencing certain genes and 'jumping genes' (bits of DNA that can move around and cause problems) using chemical tags on their DNA. Researchers found that a protein called PRP8, which normally helps the plant read its own genes, also works as a silencer through a completely different method — by organizing how DNA is physically packed in the nucleus. This discovery opens a new chapter in understanding how plants keep their genomes stable and healthy.
Key Findings
PRP8 silences transgenes, a subset of endogenous genes, and transposable elements without requiring DNA methylation, revealing a novel silencing pathway.
Hi-C genome-wide mapping showed PRP8 is required for maintaining physical interactions within pericentromeric heterochromatin and higher-order 3D chromatin organization.
PRP8 acts synergistically with four known silencing factors (MORC6, HDA6, MOM1, and NRPE1), placing it in a previously uncharacterized transcriptional gene silencing pathway.
chevron_right Technical Summary
Scientists discovered that a protein called PRP8, previously known only for helping cells process genetic information, also plays a key role in silencing genes and jumping genetic elements in plants — and it does this without relying on the chemical tags (DNA methylation) that were thought to be required for this kind of silencing.
Abstract Preview
Transcriptional gene silencing (TGS) is critical in maintaining genome integrity in plants, during which DNA methylation plays a fundamental role. The establishment and maintenance of DNA methylati...
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