Antisense RNA Identified as Booster for Gene Expression

The function of non-coding RNA (ncRNA) in cells has puzzled scientists for years. Unlike coding RNA, which produces proteins, ncRNA does not, yet it is abundant. Researchers from the University of Göttingen have uncovered a significant function of antisense RNA (asRNA), a type of ncRNA. They found that asRNA acts as a "superhighway" for cell transport, enhancing gene expression. This discovery was published in Nature.

RNA is crucial for translating DNA into proteins. Messenger RNA (mRNA), a type of coding RNA, carries protein-building instructions from DNA in the nucleus to the cytoplasm, where proteins are synthesized. In contrast, non-coding RNA, including asRNA, does not code for proteins. asRNA is produced as a complementary strand to mRNA, and its function was previously unclear.

Heike Krebber, senior author on the paper, expressed disbelief that cells would produce RNA without a purpose, calling it "contrary to nature."

Krebber’s team discovered that asRNA binds with mRNA, facilitating its transport from the nucleus to the cytoplasm. This accelerates the translation of mRNA into proteins, making asRNA a "booster" for gene expression. This mechanism is vital for cells, especially under stress or harmful environmental conditions. This research builds on the team's earlier work, also published in Nature, which showed that mRNAs activated under stress bypass quality control.

The findings explain why cells produce large amounts of asRNA. Krebber noted that producing asRNA requires significant energy, highlighting its importance. The newly discovered mechanism allows cells to quickly respond to external stimuli by producing necessary proteins in large quantities, aiding in adaptation to environmental changes or developmental stages.