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Deadenylation kinetics of mixed poly(A) tails at single-nucleotide resolution
Open accessAbstract
Shortening of messenger RNA poly(A) tails, or deadenylation, is a rate-limiting step in mRNA decay and is highly regulated during gene expression. The incorporation of non-adenosines in poly(A) tails, or ‘mixed tailing’, has been observed in vertebrates and viruses. Here, to quantitate the effect of mixed tails, we mathematically modeled deadenylation reactions at single-nucleotide resolution using an in vitro deadenylation system reconstituted with the complete human CCR4–NOT complex. Applying this model, we assessed the disrupting impact of single guanosine, uridine or cytosine to be equivalent to approximately 6, 8 or 11 adenosines, respectively. CCR4–NOT stalls at the 0, −1 and −2 positions relative to the non-adenosine residue. CAF1 and CCR4 enzyme subunits commonly prefer adenosine but exhibit distinct sequence selectivities and stalling positions. Our study provides an analytical framework to monitor deadenylation and reveals the molecular basis of tail sequence-dependent regulation of mRNA stability.
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“Previous studies have shown that the incorporation of non-A nucleotides, particularly guanosine, can interfere with the deadenylation process, thereby enhancing mRNA stability.41”
From Evaluation of synthetic mRNA with selected UTR sequences and alternative poly(A) tail, in vitro and in vivo (2025) · cites this paper as [41]
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Yu, S., & Kim, V. N. (2020) · Nature Reviews Molecular Cell Biology · doi:10.1038/s41580-020-0246-8 · Cited by 142
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Medjmedj, A., Genon, H., Hezili, D., Loth, A. N., Clemençon, R., Guimpied, C., Mollet, L., Bigot, A., Wien, F., Hamacek, J., et al. (2025) · Molecular Therapy Nucleic Acids · doi:10.1016/j.omtn.2025.102648 · Cited by 19
Metadata
- Authors
- Lee, Y.-S., Levdansky, Y., Jung, Y., Kim, V. N., & Valkov, E.
- Affiliations
- Korea Advanced Institute of Science and Technology (KR)
- National Cancer Institute (US)
- Institute for Basic Science (KR)
- Seoul National University (KR)
- Frederick National Laboratory for Cancer Research (US)
- Corresponding author
- Lee, Young-suk
- Kim, V. Narry
- Valkov, Eugene
- Venue
- Nature Structural & Molecular Biology
- Published
- 2024-02-19
- Volume
- 31
- Issue
- 5
- Pages
- 826-834
- ISSN
- 1545-9985 (ISSN-L)
- 1545-9993
- PMC
- PMC11102861
- OpenAlex
- W4391927123
- Cited by
- 21
- References
- 3
- Citations by year
- 2026: 9 · 2025: 11 · 2024: 1
- FWCI
- 2.72
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Locations
- Nature Structural & Molecular Biology (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- KAIST Institutional Repository (KAIST) (submittedVersion)
- Funders
- National Research Foundation
- Ministry of Science, ICT and Future Planning (IBS-R008-D1)
- National Research Foundation of Korea (IBS-R008-D1, NRF-2021R1A4A3032789)
- Institute for Basic Science (IBS-R008-D1, R008-D1)
- Ministry of Science and ICT, South Korea (IBS-R008-D1)
- National Institutes of Health
- National Cancer Institute
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA regulation and disease
- Keywords
- deadenylation, poly(A) tail, CCR4-NOT complex, CAF-1, CCR4, mRNA degradation, mRNA stability, sequence selectivity, mathematical modeling, single-nucleotide resolution
- MeSH terms
- Adenosine, Exoribonucleases, Humans, Kinetics, Poly A, RNA Nucleotidyltransferases, RNA, Messenger, RNA Stability, Receptors, CCR4
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