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Insights into the conservation and diversification of the molecular functions of YTHDF proteins
Open accessPreprint — published as 10.1371/journal.pgen.1010980
Abstract
YT521-B homology (YTH) domain proteins act as readers of N6 -methyladenosine (m 6 A) in mRNA. Members of the YTHDF clade determine properties of m 6 A-containing mRNAs in the cytoplasm. Vertebrates encode three YTHDF proteins whose possible functional specialization is debated. In land plants, the YTHDF clade has expanded from one member in basal lineages to eleven so-called EVOLUTIONARILY CONSERVED C-TERMINAL REGION1-11 (ECT1-11) proteins in Arabidopsis thaliana , named after the conserved YTH domain placed behind a long N-terminal intrinsically disordered region (IDR). ECT2 , ECT3 and ECT4 show genetic redundancy in stimulation of primed stem cell division, but the origin and implications of YTHDF expansion in higher plants are unknown, as it is unclear whether it involves acquisition of fundamentally different molecular properties, in particular of their divergent IDRs. Here, we use functional complementation of ect2 / ect3 / ect4 mutants to test whether different YTHDF proteins can perform the same function when similarly expressed in leaf primordia. We show that stimulation of primordial cell division relies on an ancestral molecular function of the m 6 A-YTHDF axis in land plants that is present in bryophytes and is conserved over YTHDF diversification, as it appears in all major clades of YTHDF proteins in flowering plants. Importantly, although our results indicate that the YTH domains of all arabidopsis ECT proteins have m 6 A-binding capacity, lineage-specific neo-functionalization of ECT1, ECT9 and ECT11 happened after late duplication events, and involves altered properties of both the YTH domains, and, especially, of the IDRs. We also identify two biophysical properties recurrent in IDRs of YTHDF proteins able to complement ect2 ect3 ect4 mutants, a clear phase separation propensity and a charge distribution that creates electric dipoles. Human and fly YTHDFs do not have IDRs with this combination of properties and cannot replace ECT2/3/4 function in arabidopsis, perhaps suggesting different molecular activities of YTHDF proteins between major taxa. Author Summary: Regulation of gene expression is essential to life. It ensures correct balancing of cellular activities and the controlled proliferation and differentiation necessary for the development of multicellular organisms. Methylation of adenosines in mRNA (m 6 A) contributes to genetic control, and absence of m 6 A impairs embryo development in plants and vertebrates. m 6 A-dependent regulation can be exerted by a group of cytoplasmic proteins called YTHDFs. Higher plants have many more YTHDFs than animals, but it is unknown whether these many YTHDF proteins carry out fundamentally different or roughly the same molecular functions, as only a small fraction of them have been studied thus far. This work addresses the origin and reasons behind YTHDF expansion during land plant evolution and reveals that most YTHDFs in flowering plants have the same molecular functions that facilitate rapid division of differentiating stem cells. Remarkably, this molecular activity is present in the most basal lineage of land plants and functions similarly across 450 million years of land plant evolution. We also identified a few plant YTHDF proteins with divergent molecular function despite their ability to bind to m 6 A. Our work provides a firm basis for further advances on understanding molecular properties and biological contexts underlying YTHDF diversification.
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![Fig 1 Phylogenetic analysis of YTHDF proteins in plants. (A) Schematic representation of Viridiplantae evolution and relative position of the species used in this study. The architecture of the diagram and the age (million years, My) indicated on some nodes are a simplified version of the trees from Su et al. [59] and Bowman [62]. The length of the branches has been adjusted for illustrative purposes. (B) Phylogenetic tree of YTHDF proteins in plants (S1–S4 Datasets), with color-coding and abbreviations of species names as in A. Three YTHDF proteins from taxa outside but evolutionarily close to Viridiplantae are included as outgroup. Arabidopsis thaliana (Ath) YTHDF proteins are named after the original nomenclature for proteins containing an Evolutionarily Conserved C-Terminal Region (ECT) established by Ok et al. [40]. Proteins from other plant species adhere to the nomenclature established by Scutenaire et al. [26], with small variations reflecting additional clades (DF-E, -F) and the split of the original DF-C clade into -C and -D. Statistical support is calculated as approximate likelihood-ratio test (aLRT), and indicated by grayscale-coded spheres and values on the most relevant nodes. For simplicity, only a subset of proteins is labelled–those from one representative species of the main taxa highlighted in bold in A–, but a comprehensive representation of the same tree with all protein names and aLRT values is available in S1 Fig. The length of the branches represents the evolutionary distance in number of amino acid substitutions per site relative to the scale bar. Double lines crossing the longest branches indicate that the branch has been collapsed due to space problems, but a schematic representation of their relative lengths is shown on the lower-left corner, and not-collapsed branches can be found in S1 Fig.](/paper-figures/d61359c188d94ed4b9598a8c775a315c/insights-into-the-conservation-and-diversification-of-the-molecular-functions-of-figure-1.jpg)



![Fig 5 Analysis of ECT1/9/11 functional regions. (A) Topology of the YTH domain of Homo sapiens (Hs) YTHDF1 with secondary structure elements drawn in pink [61]. The two grey helices represent the only structural elements outside the YTH domain as defined by Stoilov et al. [8]: α0 immediately upstream, and α4 at the C-terminus of the protein. Superimposed on the diagrams are the non-conservative amino acid substitutions found in Ath ECT1, ECT9 and ECT11 compared to the majority of Ath ECTs (see alignment in S16 Fig). The localization of these amino acids in the predicted 3D structures, predominantly on the surface, and the spatial integrity of the aromatic cage in the homology models of ECT1/9/11, can be found in S17 Fig. (B) Slab simulations of the IDRs of the indicated proteins showing their tendency to remain in condensed phase or disperse in solution. Source videos of ECT2, ECT1 and ECT11 simulations are provided as S1–S3 Movies (C) Time-averaged density profiles for a subset of the proteins in B. The analyses of the remaining Ath ECTs are shown in S19A Fig. (D) Calculated free energy change for the transition between aqueous solution and condensed phase (ΔGtrans = RT ln [cdilute / cdense]) for the IDRs of the indicated proteins. (E) Cumulative charge distribution of the IDRs of the indicated proteins. The length in amino acids (aa) is at scale. The same analysis for all Ath ECTs can be found in S19D Fig.](/paper-figures/8f8bf6c9549f4503a33beb64f2bca42c/insights-into-the-conservation-and-diversification-of-the-molecular-functions-of-figure-5.jpg)

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Highly accurate protein structure prediction with AlphaFold
Jumper, J., Evans, R., Pritzel, A., Green, T., Figurnov, M., Ronneberger, O., Tunyasuvunakool, K., Bates, R., Žídek, A., Potapenko, A., et al. (2021) · Nature · doi:10.1038/s41586-021-03819-2 · Cited by 43,764
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Metadata
- Authors
- Flores-Téllez, D., Tankmar, M. D., von Bülow, S., Chen, J., Lindorff-Larsen, K., Brodersen, P., & Arribas-Hernández, L.
- Affiliations
- University of Copenhagen (DK)
- Corresponding author
- Brodersen, Peter
- ORCID
- Venue
- PLoS Genetics
- Publisher
- openRxiv
- Published
- 2022-10-19
- Volume
- 19
- Issue
- 10
- Pages
- e1010980-e1010980
- ISSN
- 1553-7390 (ISSN-L)
- PMC
- PMC10617740
- OpenAlex
- W4387493067
- Cited by
- 29
- References
- 2
- Citations by year
- 2026: 7 · 2025: 13 · 2024: 7 · 2023: 2
- FWCI
- 4.56
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- cc-by
- Locations
- PLoS Genetics (publishedVersion, cc-by)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Research at the University of Copenhagen (University of Copenhagen) (publishedVersion, cc-by)
- DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion, cc-by)
- Deposito Digital UFV (Francisco de Vitoria University) (submittedVersion, cc-by-nc-nd)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- European Molecular Biology Organization (ALTF 810‐2022)
- Novo Nordisk
- Novo Nordisk Fonden (NNF19OC0054973, NNF18OC0033950)
- Danmarks Frie Forskningsfond (9040-00409B)
- H2020 European Research Council (726417)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA modifications and cancer
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
- Keywords
- N6-methyladenosine, m6A RNA methylation, intrinsically disordered regions, functional diversification, neofunctionalization, gene duplication, functional complementation, leaf primordia, stem cell division, phase separation, electric dipole, Arabidopsis thaliana, bryophytes, YTH domain
- MeSH terms
- Animals, Multigene Family, Humans, RNA, Messenger, Arabidopsis, Arabidopsis Proteins, Intracellular Signaling Peptides and Proteins
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