A research team at the University of Cologne has built a resource that details how nonsense-mediated mRNA decay (NMD) shapes gene expression in human cells. The study, published in Molecular Cell, provides the first systematic record of genes and RNA variants directly affected by NMD, offering a tool for researchers worldwide.
NMD functions as a cellular quality-control mechanism, identifying messenger RNAs with premature stop signals and eliminating them before they can produce truncated or harmful proteins. The process has long been recognized as essential for protecting cells from errors, but the dynamics of its action have remained difficult to measure.
To address this, Niels Gehring and colleagues developed a system to selectively and rapidly deplete UPF1, the central protein driving NMD. “Our new system makes it possible, for the first time, to understand how rapidly and comprehensively NMD acts in human cells,” said Gehring. “This shows that NMD not only provides protection against errors, but also acts as an important regulator of gene activity.”
By switching UPF1 off at precise times, the researchers traced NMD’s immediate effects on the transcriptome. They discovered that NMD follows consistent rules, targeting RNAs with misplaced stop signals while also regulating numerous RNA variants. “Thanks to the new system, we have found many new RNA variants that are regulated by NMD and had been previously overlooked,” said first author Volker Böhm. Some of these variants are linked to brain development.
The resulting database, freely accessible at https://nmdrht.uni-koeln.de, catalogs the breadth of RNAs influenced by NMD. Markus Landthaler of the Max Delbrück Center, a co-author, emphasized that the work demonstrates how precise tools can expose cellular mechanisms relevant to both health and disease.
Publication Details
Boehm V, Wallmeroth D, Wulf PO, Popp O, Alves LG. Rapid UPF1 depletion illuminates the temporal dynamics of the NMD-regulated human transcriptome. Molecular Cell. 2025;:. doi:10.1016/j.molcel.2025.08.015
NMD functions as a cellular quality-control mechanism, identifying messenger RNAs with premature stop signals and eliminating them before they can produce truncated or harmful proteins. The process has long been recognized as essential for protecting cells from errors, but the dynamics of its action have remained difficult to measure.
To address this, Niels Gehring and colleagues developed a system to selectively and rapidly deplete UPF1, the central protein driving NMD. “Our new system makes it possible, for the first time, to understand how rapidly and comprehensively NMD acts in human cells,” said Gehring. “This shows that NMD not only provides protection against errors, but also acts as an important regulator of gene activity.”
By switching UPF1 off at precise times, the researchers traced NMD’s immediate effects on the transcriptome. They discovered that NMD follows consistent rules, targeting RNAs with misplaced stop signals while also regulating numerous RNA variants. “Thanks to the new system, we have found many new RNA variants that are regulated by NMD and had been previously overlooked,” said first author Volker Böhm. Some of these variants are linked to brain development.
The resulting database, freely accessible at https://nmdrht.uni-koeln.de, catalogs the breadth of RNAs influenced by NMD. Markus Landthaler of the Max Delbrück Center, a co-author, emphasized that the work demonstrates how precise tools can expose cellular mechanisms relevant to both health and disease.
Publication Details
Boehm V, Wallmeroth D, Wulf PO, Popp O, Alves LG. Rapid UPF1 depletion illuminates the temporal dynamics of the NMD-regulated human transcriptome. Molecular Cell. 2025;:. doi:10.1016/j.molcel.2025.08.015