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August 26, 2025Open Access

End of the line: a kinetic ruler model for poly(A) tail termination

Key Points

The study identifies a kinetic mechanism that regulates poly(A) tail length, impacting mRNA stability and expression.
Key evidence indicates Nab2 interacts with the cleavage and polyadenylation complex to control tail length variability.
Observational analysis of budding yeast models demonstrates the function of Nab2 as a kinetic ruler for polyadenylation.
This finding may enable further understanding of post-transcriptional regulation mechanisms in mRNA processing.

Abstract

Polyadenylation of mRNA is a key step in post-transcriptional regulation. In this issue of Genes & Development , Gabs and colleagues (doi:10.1101/gad.352912.125) provide evidence for a novel, kinetically driven mechanism that dictates the length of poly(A) tails added to mRNAs in budding yeast. The investigators introduce the concept of Nab2, a zinc finger poly(A) RNA binding protein, as a “kinetic ruler,” which functions through dynamic competition with the cleavage and polyadenylation complex (CPAC) to define the length of poly(A) tails.

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