Study reveals how cells spin ‘jumping genes’ into tight molecular knots to protect genome

St. Jude researchers uncovered how the piRNA-PIWI surveillance system recognizes transposon-derived RNA and silences it.

The study shows molecular features that help cells tell “jumping gene” RNA apart from normal mRNA.

Researchers also clarified how the piRNA ping-pong loop amplifies PIWI cleavage for stronger transposon repression.

The findings explain a key genome-defense mechanism with relevance to genome stability, aging, cancer, and future therapies.