Cited by 609Genetics and Neurodevelopmental DisordersRNA and protein synthesis mechanismsNeuroscience and Neuropharmacology Research

The Fragile X Syndrome Protein Represses Activity-Dependent Translation through CYFIP1, a New 4E-BP

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Napoli, Ilaria, Mercaldo, Valentina, Boyl, Pietro Pilo, Eleuteri, Boris, Zalfa, Francesca, De Rubeis, Silvia, Di Marino, Daniele, Mohr, Evita +7 more·2008·Cell

Abstract

Strong evidence indicates that regulated mRNA translation in neuronal dendrites underlies synaptic plasticity and brain development. The fragile X mental retardation protein (FMRP) is involved in this process; here, we show that it acts by inhibiting translation initiation. A binding partner of FMRP, CYFIP1/Sra1, directly binds the translation initiation factor eIF4E through a domain that is structurally related to those present in 4E-BP translational inhibitors. Brain cytoplasmic RNA 1 (BC1), another FMRP binding partner, increases the affinity of FMRP for the CYFIP1-eIF4E complex in the brain. Levels of proteins encoded by known FMRP target mRNAs are increased upon reduction of CYFIP1 in neurons. Translational repression is regulated in an activity-dependent manner because BDNF or DHPG stimulation of neurons causes CYFIP1 to dissociate from eIF4E at synapses, thereby resulting in protein synthesis. Thus, the translational repression activity of FMRP in the brain is mediated, at least in part, by CYFIP1.

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Registry

Crossref · 10.1016/j.cell.2008.07.031

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  • BDNF regulates translation by causing release of CYFIP1 from eIF4E via the action of MNK1.

    “It was reported that BDNF regulates translation by causing release of CYFIP1 from eIF4E via the action of MAP kinase interacting serine/threonine kinase 1 (MNK1) (Napoli et al., 2008; Panja et al., 2014).”

    From New insights into the regulatory function of CYFIP1 in the context of WAVE- and FMRP-containing complexes (2017) · cites this paper as Napoli et al., 2008

    The Summary (p. 1) and the synaptic-stimulation discussion (p. 8) say that BDNF causes CYFIP1 and eIF4E to dissociate, relieving translational repression. Neither passage identifies MNK1 as the mediator, and searches for MNK1 and its full name found no support for that mechanism in our copy. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • CYFIP1 has a vital role in the local regulation of spine actin dynamics via WAVE and Arp2/3.

    “In addition to previous functions described for CYFIP1 in the regulation of mRNA translation in dendrites and mGluR-long-term depression, our results suggest that CYFIP1 also has a vital role in the local regulation of spine actin dynamics via WAVE and Arp2/3.32,35”

    From The autism and schizophrenia associated gene CYFIP1 is critical for the maintenance of dendritic complexity and the stabilization of mature spines (2014) · cites this paper as [32]

    The activity-regulation section (p. 7) supports CYFIP1’s role in dendritic mRNA translation, and the Discussion (p. 8) identifies it as a component of the actin-related WAVE complex. The paper reports a response to mGluR stimulation (p. 8), but does not establish a role in mGluR-long-term depression. The spine-actin conclusion is presented as the citing authors’ own result, not a finding attributed to this source. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • CYFIP1 couples actin dynamics to other cellular processes, such as carrier vesicle biogenesis in the trans-Golgi network, and, via interactions with FMRP, regulates synaptic mRNA translation in an activity-dependent manner.

    “Furthermore, CYFIP1 couples actin dynamics to other cellular processes, such as carrier vesicle biogenesis in the trans-Golgi network, and, via interactions with the FRMP (Fragile X mental retardation protein), regulates synaptic mRNA translation in an activity-dependent manner.32,33”

    From The autism and schizophrenia associated gene CYFIP1 is critical for the maintenance of dendritic complexity and the stabilization of mature spines (2014) · cites this paper as [32]

    The Discussion (p. 8) identifies CYFIP1 as a component of the actin-polymerization WAVE complex, and the synapse experiments (p. 8) support activity-dependent regulation of translation through the FMRP–CYFIP1 complex. Our copy does not support the further claim that CYFIP1 couples actin dynamics to carrier vesicle biogenesis in the trans-Golgi network. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • The predicted conformational change moves the domain carrying the eIF4E-binding site toward the outside, allowing Lys743 to interact with Glu132 of eIF4E.

    “The consequence of this conformational change is that the domain carrying the eIF4E-binding site moves toward the outside (Figure 2D), allowing Lys743 to interact with Glu132 of eIF4E (Figure 1A) (Napoli et al., 2008).”

    From CYFIP1 Coordinates mRNA Translation and Cytoskeleton Remodeling to Ensure Proper Dendritic Spine Formation (2013) · cites this paper as Napoli et al., 2008

    The Figure 2 discussion (p. 4) predicts that CYFIP1 Lys743 is positioned to form a salt bridge with Glu132 of eIF4E. It describes a predicted shape of the binding peptide, but not a conformational change that moves the eIF4E-binding domain outward; that part of the attributed claim is unsupported. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • The BDNF-RAC1-CYFIP1 pathway can increase both the local protein translation and actin polymerization required for synaptic plasticity.

    “Thus, the BDNF-RAC1-CYFIP1 pathway can increase both the local protein translation and actin polymerization required for synaptic plasticity66,69.”

    From The WAVE complex in developmental and adulthood brain disorders (2025) · cites this paper as [69]

    The synapse experiments (p. 8) show that BDNF releases eIF4E from CYFIP1, consistent with increased local translation. The paper also links CYFIP1 to the actin-polymerizing WAVE complex (Discussion, p. 8), but it does not show that BDNF increases actin polymerization through a RAC1–CYFIP1 pathway; a RAC1 role in releasing translational repression is described as speculation (p. 9). (LLM, conf=0.86)

    Experimental — accuracy not yet measured

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Authors
Napoli, I., Mercaldo, V., Boyl, P. P., Eleuteri, B., Zalfa, F., De Rubeis, S., Di Marino, D., Mohr, E., Massimi, M., Falconi, M., Witke, W., Costa-Mattioli, M., Sonenberg, N., Achsel, T., & Bagni, C.
Affiliations
  • University of Rome Tor Vergata (IT)
  • Fondazione Santa Lucia (IT)
  • KU Leuven (BE)
  • University Medical Center Hamburg-Eppendorf (DE)
  • European Molecular Biology Laboratory (IT)
  • McGill University (CA)
Corresponding author
Bagni, Claudia
Venue
Cell
Publisher
Elsevier BV
Published
2008-09
Volume
134
Issue
6
Pages
1042-1054
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2062535336
Cited by
609
References
66
Citations by year
2026: 8 · 2025: 28 · 2024: 29 · 2023: 26 · 2022: 31 · 2021: 30 · 2020: 44 · 2019: 34 · 2018: 34 · 2017: 33 · 2016: 40 · 2015: 40 · 2014: 46 · 2013: 46 · 2012: 43
FWCI
18.24
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Lirias (submittedVersion, other-oa)
  • Cineca Institutional Research Information System (Tor Vergata University) (submittedVersion)
  • eScholarship@McGill (McGill) (submittedVersion, cc-by-nc-nd)
  • Università Politecnica delle Marche (Università Politecnica delle Marche) (submittedVersion)
Funders
Vlaamse regering
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
fragile X syndrome, FMRP, CYFIP1, 4E-BP, eIF4E, protein synthesis inhibition, dendritic translation, synaptic plasticity, brain-derived neurotrophic factor, DHPG, translation initiation, neurons
MeSH terms
Amino Acid Sequence, Animals, Brain, Cells, Cultured, Mice, Inbred C57BL, Models, Molecular, Molecular Sequence Data, Nerve Tissue Proteins, Neurons, Synapses, Protein Biosynthesis, Sequence Alignment, Mice, Knockout, Eukaryotic Initiation Factor-4E, Adaptor Proteins, Signal Transducing, Mice, Fragile X Messenger Ribonucleoprotein 1

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