Cited by 5RNA Research and SplicingRNA modifications and cancerRNA regulation and disease

TET dioxygenases localize at splicing speckles and promote RNA splicing

Open access
Hastert, Florian D., Weber, Jasmin, Bauer, Christina, Zhadan, Andreas, Singh, Deepanshu N. D., Dix, Thomas C., Arnold, Roland, Bessonov, Sergey +4 more·2025·Nucleus

Published version of a preprint

Abstract

The dynamic regulation of RNA metabolism plays a crucial part in cellular function, with emerging evidence suggesting an important role for RNA modifications in this process. This study explores the relationship between RNA splicing and the TET dioxygenase activity, shedding light on the role of hm5C (RNA 5-hydroxymethylcytosine), and TET proteins in RNA metabolism. Integrating data from mass spectrometry, AlphaFold structural modeling, microscopic analysis, and different functional assays, including in vitro splicing, TET proteins were found to regulate splicing. We show that TET1, TET2, and TET3 interact with the splicing factors U2AF1 and U2AF2. Interestingly, TET dioxygenases localize in splicing speckles in mammalian and Drosophila cells. TET speckles association was found to be RNA-dependent, but also rely on its interaction with splicing factors. Furthermore, cellular splicing assays revealed that all three TET proteins promote splicing efficiency independent of their catalytic activity. Interestingly, though, the oxidation of m5C to hm5C restores splicing efficiency in vitro. The latter highlights the regulatory role of cytosine modifications in RNA metabolism. These findings provide insights into the complex interplay between RNA modifications and splicing, suggesting a multifaceted role for TET proteins in RNA metabolism beyond their canonical function in the oxidation of 5mC in DNA.

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Crossref · 10.1080/19491034.2025.2536902

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Authors
Hastert, F. D., Weber, J., Bauer, C., Zhadan, A., Singh, D. N. D., Dix, T. C., Arnold, R., Bessonov, S., Soller, M., Leonhardt, H., Cardoso, M. C., & Arroyo, M.
Affiliations
  • Technische Universität Darmstadt (DE)
  • Ludwig-Maximilians-Universität München (DE)
  • University of Birmingham (GB)
  • Max Planck Society (DE)
  • University of Manchester (GB)
Corresponding author
  • Cardoso, M. Cristina
  • Arroyo, Maria
Venue
Nucleus
Published
2025-07-27
Volume
16
Issue
1
Pages
2536902-2536902
ISSN
  • 1949-1034 (ISSN-L)
  • 1949-1042
OpenAlex
W4412725949
Cited by
5
References
110
Citations by year
2026: 3 · 2025: 2
FWCI
1.50
Type
journal article
Language
en
Open access
Locations
  • Nucleus (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Research Explorer (The University of Manchester) (publishedVersion)
  • TUbilio (Technical University of Darmstadt) (acceptedVersion)
  • University of Birmingham Research Portal (University of Birmingham) (submittedVersion, cc-by-nc)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • GoeScholar The Publication Server of the Georg-August-Universität Göttingen (Georg-August-Universität Göttingen) (submittedVersion, cc-by-nc)
Funders
  • Deutsche Forschungsgemeinschaft (CA 198/16–1 project number 425470807)
  • Biotechnology and Biological Science Research Council
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA modifications and cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA regulation and disease
Keywords
TET enzymes, RNA splicing, nuclear speckles, 5-hydroxymethylcytosine, U2AF1, U2AF2, RNA modification, RNA metabolism, TET1, TET2, TET3, Drosophila cells
MeSH terms
Splicing Factor U2AF, Animals, DNA-Binding Proteins, HeLa Cells, Humans, Mixed Function Oxygenases, Proto-Oncogene Proteins, RNA Splicing, Dioxygenases

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