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Fragile X mental retardation protein and synaptic plasticity

Michael S Sidorov, Benjamin D Auerbach, Mark F Bear

Molecular Brain · 2013 · Review

doi:10.1186/1756-6606-6-15

Abstract

Loss of the translational repressor FMRP causes Fragile X syndrome. In healthy neurons, FMRP modulates the local translation of numerous synaptic proteins. Synthesis of these proteins is required for the maintenance and regulation of long-lasting changes in synaptic strength. In this role as a translational inhibitor, FMRP exerts profound effects on synaptic plasticity.

Full text

From PubMed Central, U.S. National Library of Medicine, as current on Oct 19, 2026. Paragraph numbers are ours, so an answer can point at one.

Background

The long-term maintenance of many forms of synaptic plasticity requires the synthesis of new proteins. While the role of experience-dependent somatic gene transcription in long-term memory has been well studied, many mRNAs are trafficked to dendrites suggesting an additional role for local synaptic control of protein synthesis. Indeed, activity-dependent translation of pre-existing dendritic mRNA at the synapse is necessary for the expression of multiple forms of synaptic plasticity. Fragile X mental retardation protein (FMRP) influences this synaptic plasticity by functioning as a key regulator of mRNA translation.

FMRP was first characterized in the context of Fragile X syndrome. The FMR1 gene is silenced in Fragile X (FX), and the consequent loss of FMRP leads to the symptoms of the disorder, often including intellectual disability and autism. In the Fmr1 KO mouse model, loss of FMRP results in increased levels of protein synthesis. The downstream consequences of this increase are believed to at the core of FX pathophysiology. Rapid progress has been made characterizing how loss of FMRP influences synaptic function and plasticity, and this knowledge has led to several strategies to correct the disorder that have been validated in animals and are now being tested in humans.

Here we briefly review the evidence, mostly from the Fmr1 KO mouse, suggesting a role for FMRP in synaptic plasticity. Although the distinction is not always clear-cut, it is conceptually important to separate disruptions of synaptic plasticity that are consequences of altered brain development from those disruptions of synaptic plasticity that cause altered brain function in the Fmr1 KO. While both are important for understanding disease pathophysiology, only the latter is relevant to the question of how FMRP contributes to synaptic plasticity in the wild-type brain.

FMRP regulates translation

FMRP is an RNA-binding protein and a repressor of translation which is well-conserved from mouse to human. FMRP associates with mRNAs through one of three RNA-binding domains, in some cases in conjunction with adaptor proteins. There is evidence that FMRP can repress translation both by blocking initiation and elongation. A point mutation in one FMRP/mRNA binding domain is sufficient to recapitulate plasticity phenotypes seen in the Fmr1 KO mouse and in at least one case FX in a human patient. Thus it is likely that FMRP regulates plasticity mainly in its role as a repressor of translation.

FMRP is regulated by posttranslational modifications. Phosphorylated FMRP stalls ribosomal translocation and inhibits translation, whereas dephosphorylation of FMRP upregulates translation. Bidirectional regulation of FMRP phosphorylation by the S6 kinase and protein phosphatase 2A (PP2A) in response to activity provide a potential link between synaptic stimulation and local translation.

FMRP is well-positioned to regulate synaptic plasticity

FMRP is well-positioned to be a key regulator of synaptic plasticity for three main reasons. First, the protein is found in dendritic spines, important postsynaptic sites of plasticity induction and maintenance. Secondly, FMRP regulates dendritic mRNA translation, which is required for multiple forms of plasticity. Finally, FMRP itself is dynamically regulated by activity: experience and synaptic activation can trigger its local translation and rapid degradation, in addition to the posttranslational regulation mentioned above. Multiple experimental manipulations associated with synaptic plasticity have been shown to increase FMRP levels, including exposure to an enriched environment, a complex learning task, and pharmacological activation of group 1 metabotropic glutatmate receptors (mGluRs). Importantly, FMRP is synthesized rapidly, on the same time scale (10–30 minutes) as induction of stable synaptic plasticity. In hippocampal cultures, activity- and mGluR-dependent increases in dendritic FMRP may result from increased trafficking of existing FMRP, rather than de novo FMRP synthesis. Either way, FMRP is an ideal candidate to be involved in regulating synaptic plasticity because of its rapid, transient rise in dendrites following well-characterized plasticity induction paradigms, as well as its role as an inhibitor of translation.

FMRP regulates mGluR-LTD via protein synthesis

Long-term potentiation (LTP) and long-term depression (LTD) are well-characterized forms of synaptic plasticity associated with learning and memory. These persistent changes in synaptic strength can be induced by a variety of manipulations and their expression mechanisms are diverse. Different induction protocols rely on different mechanisms for maintenance, including the requirement for protein synthesis. A particularly compelling example of a form of plasticity requiring local translation is metabotropic glutamate receptor-dependent LTD (mGluR-LTD) in the CA1 region of the hippocampus. Activation of group 1 mGluRs (mGluR1 and 5), either with paired-pulse low-frequency synaptic stimulation (PP-LFS) or with the selective agonist (S)-3,5-dihydroxyphenylglycine (DHPG), results in a persistent decrease in synaptic strength that is mechanistically distinct from classical NMDA receptor (NMDAR)-dependent LTD. It is important to note that there are several mechanisms downstream of mGluR activation that can depress synaptic transmission, and these can be differentially expressed depending on the induction protocol, age, rearing history, and species (e.g.,). However, under appropriate experimental conditions the maintenance of mGluR-LTD requires rapid protein synthesis within minutes of induction. This protein synthesis is likely to be synaptic, as mGluR-LTD can still be induced if the dendritic layer is physically severed from the cell body layer. mGluR-LTD is expressed, in part, by the removal of AMPA receptors from synapses, which also requires rapid de novo translation. The new protein synthesis may be instructive rather than merely permissive for synaptic plasticity since activation of group 1 mGluRs rapidly stimulates protein synthesis in hippocampal slices, dendrites and synaptoneurosomes.

Fmr1 knockout mice show enhanced hippocampal mGluR-LTD (Table 1). A subsequent study found a similar enhancement in cerebellar mGluR-LTD, which shares many of the same expression mechanisms. Consistent with the electophysiological data, loss of FMRP leads to excessive mGluR-mediated AMPAR internalization. In addition, mGluR-LTD no longer requires new protein synthesis in the Fmr1 KO mice. These results, combined with what is known about FMRP function, suggest that FMRP acts to inhibit the synthesis of proteins required for mGluR-LTD. In the absence of FMRP, these “LTD proteins” are already available or over-expressed in dendrites resulting in enhanced magnitude and protein synthesis-independent persistence of this form of plasticity (Figure 1A). Conversely, postnatal overexpression of FMRP reduces the magnitude of mGluR-LTD in both wildtype and Fmr1 KO neurons and restores its protein synthesis dependence. Moreover, reducing mGluR5 signaling in Fmr1 KO mice restores both protein synthesis rates and LTD magnitude in the hippocampus to wildtype levels, suggesting that mGluR5 and FMRP act in functional opposition to maintain an optimal level of synaptic protein synthesis throughout development and into adulthood (Figure 1A).

L-LTP appears normal in Fmr1 KO mice

While the effects of protein synthesis inhibition on mGluR-LTD can be seen within minutes, most forms of synaptic plasticity do not require de novo synthesis until several hours after induction. This is best characterized by late phase LTP (L-LTP), a persistent form of potentiation lasting at least 4 hours. The late maintenance phase of L-LTP requires protein synthesis but initial induction does not. Due to FMRP’s conjectured role in translation regulation, L-LTP was one of the first forms of plasticity studied in the Fmr1 KO mouse. Interestingly, no difference has been found in the magnitude of L-LTP in the Fmr1 KO. The fact that removal of FMRP affects protein synthesis-dependent LTD but not LTP suggests that FMRP may specifically regulate the translation of proteins required for the expression of LTD (Figure 1B). However, while the magnitude of L-LTP is unchanged, it is possible that L-LTP is qualitatively different in its requirement for new protein synthesis when FMRP is absent, as is the case for mGluR-LTD (and LTP priming, see below). Therefore, it will be important to test the protein synthesis-dependency of L-LTP in Fmr1 KO mice to show that FMRP truly does not play a role in regulating the persistence of LTP.

Alternatively, FMRP may be required for the regulation of local but not somatic translation in the context of L-LTP (Figure 1C). L-LTP is traditionally induced by multiple trains of high frequency tetanus or theta burst stimulation, protocols that rely on cell-wide transcription and translation. L-LTP was characterized in the Fmr1 KO mouse using these classical paradigms. However, using a less intense induction protocol results in L-LTP that is maintained specifically by local dendritic translation. This form of L-LTP, similar to mGluR-LTD, is sensitive to inhibitors of translation but not transcription, and can be maintained in isolated dendrites. It will be interesting to determine if this locally expressed form of L-LTP is regulated by FMRP.

FMRP regulates LTP priming

While the role of FMRP in L-LTP is unclear, FMRP is known to be involved in LTP in other contexts. In particular, FMRP is involved in regulation of an mGluR-dependent form of metaplasticity that sets the threshold for LTP. Originally described in rats, weak activation of group 1 mGluRs, in itself insufficient for LTD induction, facilitates the subsequent induction of LTP (“LTP priming”). As with mGluR-LTD, this facilitation requires translation but not transcription. This prompted the examination of the role of FMRP in LTP priming. mGluR-dependent priming of LTP is of comparable magnitude in WT and Fmr1 KO mice; however, while LTP priming requires acute stimulation of protein synthesis in WT mice, it is no longer protein synthesis-dependent in the Fmr1 KO. Thus, while mGluR-LTD and LTP priming are qualitatively different functional consequences of Gp1 mGluR-stimulated protein synthesis in the hippocampus, both processes are altered by the removal of FMRP (Figure 1D). These results suggest that the mRNA under translational control of FMRP may code for proteins required for bidirectional changes in synaptic strength. Thus, the proteins regulated by FMRP should be conceptualized as plasticity gatekeepers rather than solely “LTD proteins.”

The induction threshold for LTP and STD-LTP is raised in Fmr1 KO mice

In Fmr1 KO hippocampal slices, LTP induction is deficient with a weak 5 theta burst protocol but is normal with a strong 10 theta burst protocol (Figure 2A). In addition, FMRP modulates the induction threshold for spike-timing dependent long-term potentiation (STD-LTP). This form of Hebbian plasticity is induced by temporally staggered presynaptic and postsynaptic activity within a very short window. In somatosensory and prefrontal cortices, STD-LTP is deficient in Fmr1 KO neurons. However, if the postsynaptic stimulus strength is increased from a single spike to a burst of five spikes, STD-LTP does occur in KO neurons (Figure 2A). Therefore FMRP is not required for expression of STD-LTP, but the threshold is raised in its absence. A possible mechanism for ongoing regulation of LTP thresholds by FMRP is discussed later in this review.

FMRP and other translation-dependent forms of plasticity

In addition to its role in translation-dependent forms of Hebbian plasticity, FMRP can also modulate some forms of homeostatic plasticity. Synaptic scaling is a form of homeostatic plasticity that acts to keep the strength of synapses within a functional range in response to extreme changes in activity. Broadly, a decrease in activity leads to a subsequent cell-wide increase in synaptic strength (“scaling up”) and an increase in activity leads to a decrement in synaptic strength (“scaling down”). Two types of scaling up have been described in hippocampal slice culture: one that requires transcription and one that requires local translation. Interestingly, only the translation-dependent form of synaptic scaling is deficient in neurons lacking FMRP. Postsynaptic viral expression of FMRP corrects deficient translation-dependent scaling up in Fmr1 KO neurons. Scaling down of synapses in response to high levels of activity (following prolonged blockade of inhibition) has also been observed and requires mGluR5 activation. However, the role of FMRP and local protein synthesis in scaling down has not been directly examined.

While the role of FMRP has been best characterized in mGluR-dependent forms of plasticity, it is not specific to these receptors. Removal of FMRP occludes TrkB-mediated increases in protein synthesis and alters other forms of G protein-coupled receptor (GPCR)-dependent LTD and LTP. The common thread between these processes is their reliance on local dendritic translation. Indeed, evidence suggests that FMRP may specifically be important for the regulation of local rather than somatic translation (Figure 1C), as removal of FMRP affects translation but not transcription-dependent forms of Hebbian and homeostatic plasticity.

FMRP and translation-independent plasticity

While many forms of translation-dependent synaptic plasticity are abnormal in Fmr1 KO mice, other forms of hippocampal plasticity, including NMDAR-dependent LTD and early-phase LTP, are normal. These observations suggest that FMRP regulates plasticity mainly in its role as a regulator of translation. However, removal of FMRP has also been shown to affect some forms of synaptic plasticity that do not require de novo translation, such as early-phase LTP in other brain areas, including the cortex and amygdala. Some of these effects could be explained by FMRP modulation of protein synthesis-dependent plasticity thresholds; however it seems likely that many represent end-stage consequences of altered synaptic development in the Fmr1 KO.

A case in point is altered LTP in the amygdala. A substantial deficit in basal transmission was reported at the same synapses that showed impaired LTP. Reduced synaptic connectivity might have caused the defective LTP, and might have arisen as a consequence of increased FMRP-dependent protein synthesis during the development of amygdala circuitry.

Candidate plasticity gating proteins regulated by FMRP

In order to determine how FMRP regulates synaptic plasticity, we must identify the synaptic proteins whose translation is regulated by FMRP. FMRP has a wide variety of targets - it has been shown to selectively bind approximately 4% of the mRNA in the mammalian brain. Recently, over 800 mRNA binding targets of FMRP were identified using a novel high throughput cross-linking immunoprecipitation (HITS-CLIP) assay. These targets include genes coding for pre- and post-synaptically expressed proteins: 27% of pre-synaptic protein mRNAs (90 genes) and 23% of postsynaptic protein mRNAs (257 genes) are FMRP targets. More specifically, the HITS-CLIP study found that 31% of mRNAs coding for proteins in the NMDAR complex (58 genes), 62% in the mGluR5 complex (32 genes), and 33% in the AMPAR complex (3 genes) are FMRP targets. These three receptor complexes are important for the induction and maintenance of synaptic plasticity, suggesting that FMRP likely acts broadly as a translational regulator rather than solely regulating one or two “plasticity proteins.”

The finding that many FMRP targets encode presynaptic proteins is interesting and illuminating. In the mature nervous system the evidence for local protein synthesis in axons or axon terminals is still sparse; however during early axon development and synapse formation local protein synthesis is believed to play an important role in pathway and target selection. Thus, the absence of FMRP regulation of protein synthesis during early development very likely alters synaptic connectivity well before the onset of experience-dependent postnatal plasticity. In addition, outside the CNS, local control of translation in sensory afferent terminals plays a role in nociceptive sensitization and neuropathic pain. FMRP is localized to these terminals and Fmr1 KO mice show altered nociceptive sensitization. These results suggest that in the spinal cord, presynaptic FMRP may inhibit local translation and can regulate pain plasticity even into adulthood.

We have discussed two major categories of plasticity defects in Fmr1 KO mice: (1) forms of plasticity requiring FMRP/local translation for their maintenance (mGluR-LTD) and (2) forms of plasticity where FMRP regulates their induction threshold (STD-LTP). We will discuss a few proteins in both categories that are likely involved given their regulation by FMRP and their known roles in plasticity maintenance and threshold-setting in wild-type synapses. These “candidate proteins” are meant to serve as exemplars of how FMRP might regulate synaptic plasticity.

Plasticity maintenance proteins: MAP1B, Arc, and STEP

Recent work has identified proteins whose translation is regulated by FMRP and are involved in mGluR-LTD, including microtubule-associated protein 1B (MAP1B) and activity-regulated cytoskeleton-associated protein (Arc). MAP1B is required for mGluR-depdendent AMPA receptor endocytosis, the mechanism by which mGluR-LTD is expressed. FMRP associates with MAP1B mRNA and represses its translation, and Fmr1 KO mice show increased hippocampal MAP1B expression. However, there may be mouse strain and region-specific variations in how FMRP regulates MAP1B translation. For example, in the cerebellum and hippocampus of FVB mice, FMRP may positively regulate MAP1B expression.

Arc is involved in AMPAR endocytosis and is upregulated in dendrites following mGluR activation and behavior. Arc is required for hippocampal mGluR-LTD and L-LTP, which are both protein synthesis-dependent, and Arc−/− mice have multiple learning deficits. FMRP binds Arc mRNA and suppresses its translation. As a result, Arc expression is increased in Fmr1 KO dendrites. Since (a) mGluR-LTD is increased in Fmr1 KO mice, (b) Arc is increased in Fmr1 KO dendrites, and (c) Arc is required for mGluR-LTD, it seems likely that FMRP regulates mGluR-LTD via Arc. This hypothesis was tested directly using Fmr1/Arc double knockout mice which show deficient (rather than exaggerated) mGluR-LTD. This finding suggests that increased Arc expression may partially account for the enhanced mGluR-LTD seen in Fmr1 KO mice.

Mechanistically, dephosphorylation of FMRP by the phosphatase PP2A is required for rapid mGluR-mediated increases in Arc protein. However in Fmr1 KO neurons, Arc levels are basally increased, occluding a further effect of DHPG treatment. Acute viral reintroduction of FMRP into Fmr1 KO neurons normalizes dendritic Arc levels and restores rapid mGluR-mediated Arc synthesis. This provides further evidence that the acute loss of FMRP, rather than developmental abnormality, underlies synaptic plasticity phenotypes in the Fmr1 knockout mouse. eregulation of translation.

In addition to MAP1B and Arc, numerous other candidate LTD proteins have been identified in the Fmr1 KO mouse. One interesting example is striatal-enriched protein tyrosine phosphatase (STEP). Translation of STEP is increased during mGluR-LTD, and STEP mRNA binds to FMRP. Genetic reduction of STEP corrects behavioral phenotypes in the Fmr1 KO mouse; but it is not known whether corresponding LTD phenotypes are affected. Additional candidate proteins include APP, OPHN1, CaMKIIα, PSD-95, and PI3K.

Plasticity threshold-regulating proteins: Kv4.2

A recent review discussing the role of potassium channels in Fragile X provides insight into how FMRP may regulate excitability. FMRP directly regulates the translation of at least three potassium channels: Kv4.2, Kv3.1b, and Slack. FMRP’s control of Kv4.2 translation may have indirect consequences on regulating the threshold for LTP and STD-LTP induction.

Kv4.2 is an A-type potassium channel that regulates dendritic excitability and the extent of action potential backpropagation. A-type currents act to dampen dendritic excitability and AP backpropagation (Figure 2B). By modulating the strength of backpropagation, Kv4.2 also has been shown to regulate the threshold for LTP and STD-LTP. In the absence of Kv4.2, dendrites are more excitable and there is a decreased threshold for LTP induction.

Fmr1 KO mice have an increased threshold for LTP and STD-LTP induction, as discussed earlier (Figure 2A). One potential hypothesis for this phenomenon is that FMRP inhibits the translation of Kv4.2, and Fmr1 KO mice have excessive Kv4.2 protein synthesized in dendrites. Indeed, FMRP does directly associate with and negatively regulate the translation of Kv4.2 mRNA. But does this account for the altered LTP/STD-LTP threshold in Fmr1 KO mice? Pharmacological inhibition of Kv4.2 in Fmr1 KO mice does correct deficient weak-stimulus hippocampal LTP while strong-stimulus LTP remains unchanged (Figure 2C). This finding suggests that the increased threshold for LTP in the Fmr1 KO mouse may be accounted for by increased translation of the potassium channel Kv4.2.

Interestingly, another group has recently shown that under their conditions, FMRP positively regulates the translation of Kv4.2. This study did not address the potential consequences of decreased Kv4.2 in the Fmr1 KO on synaptic plasticity. One would expect increased dendritic excitability, which has been previously reported in other contexts, and a decreased LTP threshold. It will be important to determine the precise experimental and in vivo conditions under which each of these opposing patterns of regulation can occur, but it is clear that FMRP’s regulation of Kv4.2 in either direction would have important consequences for plasticity.

FMRP, synaptic plasticity and learning

Long-lasting synaptic potentiation and depression have long been considered potential neural correlates of learning and memory. In conjunction with FMRP’s role in synaptic plasticity in multiple brain areas, FMRP is also important for a wide range of behavioral learning tasks in mice. Fmr1 KO mice show deficient amygdalar trace fear memory, cerebellar learning, inhibitory avoidance learning, and have difficulties with a prefrontal cognitive learning task. Drosophila mutants lacking FMRP also have impaired long-term memory. Overall, learning and memory deficits in the Fmr1 KO mouse are a likely behavioral consequence of abnormal synaptic plasticity.

Conclusions

FMRP participates in the regulation of numerous forms of synaptic plasticity, including mGluR-LTD, LTP priming, and synaptic scaling. It seems that FMRP is particularly important for synaptic plasticity that requires dendritic translation, as these forms of plasticity all require local translation and FMRP is a well-established regulator of local translation. The current evidence suggests that FMRP plays an essential role in regulating the synaptic expression of proteins required for bidirectional changes in synaptic strength (Figure 1). It is likely that FMRP controls the expression of proteins not only acutely required for expression of synaptic plasticity, but also proteins that regulate the threshold for plasticity induction (Figure 2). Therefore FMRP’s role in synaptic plasticity is two-fold: it regulates the translation of proteins that directly participate in the induction and expression of plasticity as well as proteins that can indirectly modulate the properties of plasticity.

A key goal in the Fragile X field is to identify which proteins are regulated by FMRP and how increases or decreases in these proteins may account for phenotypes of the disorder. Determining the proteins that are regulated by FMRP (and altered in FX) will also lead to a better understanding of the neuronal processes that are essential for synaptic plasticity and learning/memory. The HITS-CLIP screen has identified hundreds of candidates and a significant number of these are putatively involved in synaptic plasticity. It is unlikely that there is one global “plasticity protein” - multiple proteins likely regulate different processes in parallel. Mapping which proteins are essential for which processes is the important next step for understanding the role of FMRP in the pathological and non-pathological brain.

The Fmr1 KO mouse provides a model for assessing the role of FMRP in synaptic plasticity - but on their own, studies in Fmr1 KO mice leave open the possibility that developmental rather than acute changes result in altered synaptic plasticity. In multiple contexts, acute manipulations of FMRP suggest that FMRP does actively regulate synaptic plasticity as a regulator of translation. There is ample evidence that FMRP can directly impact synaptic plasticity through its control of protein synthesis. Future work that allows for better temporal and spatial control of FMRP expression will help dissect the role of FMRP in development from its acute effects on synaptic plasticity.

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

All authors drafted, read, and approved the manuscript.

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    Huber KM Roder JC Bear MF Chemical induction of mGluR5- and protein synthesis-dependent long-term depression in hippocampal area CA1J Neurophysiol2001 86321325

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    Oliet SH Malenka RC Nicoll RA Two distinct forms of long-term depression coexist in CA1 hippocampal pyramidal cellsNeuron1997 18969982

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    Zakharenko SS Zablow L Siegelbaum SA Altered presynaptic vesicle release and cycling during mGluR-dependent LTDNeuron2002 3510991110

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    Nosyreva ED Huber KM Developmental switch in synaptic mechanisms of hippocampal metabotropic glutamate receptor-dependent long-term depressionJ Neurosci2005 2529923001

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    Auerbach BD Osterweil EK Bear MF Mutations causing syndromic autism define an axis of synaptic pathophysiologyNature2011 4806368

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    Hou L Antion MD Hu D Spencer CM Paylor R Klann E Dynamic translational and proteasomal regulation of fragile X mental retardation protein controls mGluR-dependent long-term depressionNeuron2006 51441454

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    Snyder EM Philpot BD Huber KM Dong X Fallon JR Bear MF Internalization of ionotropic glutamate receptors in response to mGluR activationNat Neurosci2001 410791085

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    Job C Eberwine J Identification of sites for exponential translation in living dendritesProc Natl Acad Sci USA2001 981303713042

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    Michalon A Sidorov M Ballard TM Ozmen L Spooren W Wettstein JG Jaeschke G Bear MF Lindemann L Chronic Pharmacological mGlu5 Inhibition Corrects Fragile X in Adult MiceNeuron2012 744956

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    Koekkoek SK Yamaguchi K Milojkovic BA Dortland BR Ruigrok TJ Maex R De Graaf W Smit AE VanderWerf F Bakker CE Deletion of FMR1 in Purkinje cells enhances parallel fiber LTD, enlarges spines, and attenuates cerebellar eyelid conditioning in Fragile X syndromeNeuron2005 47339352

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    Nosyreva ED Huber KM Metabotropic receptor-dependent long-term depression persists in the absence of protein synthesis in the mouse model of fragile X syndromeJ Neurophysiol2006 9532913295

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    Dolen G Osterweil E Rao BS Smith GB Auerbach BD Chattarji S Bear MF Correction of fragile X syndrome in miceNeuron2007 56955962

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    Stanton PK Sarvey JM Blockade of long-term potentiation in rat hippocampal CA1 region by inhibitors of protein synthesisJ Neurosci1984 430803088

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    Paradee W Melikian HE Rasmussen DL Kenneson A Conn PJ Warren ST Fragile X mouse: strain effects of knockout phenotype and evidence suggesting deficient amygdala functionNeuroscience1999 94185192

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    Nguyen PV Abel T Kandel ER Requirement of a critical period of transcription for induction of a late phase of LTPScience1994 26511041107

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    Kelleher RJ 3rd Govindarajan A Jung HY Kang H Tonegawa S Translational control by MAPK signaling in long-term synaptic plasticity and memoryCell2004 116467479

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    Cohen AS Abraham WC Facilitation of long-term potentiation by prior activation of metabotropic glutamate receptorsJ Neurophysiol1996 76953962

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    Raymond CR Thompson VL Tate WP Abraham WC Metabotropic glutamate receptors trigger homosynaptic protein synthesis to prolong long-term potentiationJ Neurosci2000 20969976

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    Auerbach BD Bear MF Loss of the fragile X mental retardation protein decouples metabotropic glutamate receptor dependent priming of long-term potentiation from protein synthesisJ Neurophysiol2010 10410471051

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    Lauterborn JC Rex CS Kramar E Chen LY Pandyarajan V Lynch G Gall CM Brain-derived neurotrophic factor rescues synaptic plasticity in a mouse model of fragile X syndromeJ Neurosci2007 271068510694

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    Markram H Lubke J Frotscher M Sakmann B Regulation of synaptic efficacy by coincidence of postsynaptic APs and EPSPsScience1997 275213215

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    Bi GQ Poo MM Synaptic modifications in cultured hippocampal neurons: dependence on spike timing, synaptic strength, and postsynaptic cell typeJ Neurosci1998 181046410472

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    Meredith RM Holmgren CD Weidum M Burnashev N Mansvelder HD Increased threshold for spike-timing-dependent plasticity is caused by unreliable calcium signaling in mice lacking fragile X gene FMR1Neuron2007 54627638

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  75. 75.

    Turrigiano GG The self-tuning neuron: synaptic scaling of excitatory synapsesCell2008 135422435

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  76. 76.

    Ibata K Sun Q Turrigiano GG Rapid synaptic scaling induced by changes in postsynaptic firingNeuron2008 57819826

    Not in our library10.1016/j.neuron.2008.02.031

  77. 77.

    Sutton MA Ito HT Cressy P Kempf C Woo JC Schuman EM Miniature neurotransmission stabilizes synaptic function via tonic suppression of local dendritic protein synthesisCell2006 125785799

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    Soden ME Chen L Fragile X protein FMRP is required for homeostatic plasticity and regulation of synaptic strength by retinoic acidJ Neurosci2010 301691016921

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    Turrigiano GG Leslie KR Desai NS Rutherford LC Nelson SB Activity-dependent scaling of quantal amplitude in neocortical neuronsNature1998 391892896

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    Hu JH Park JM Park S Xiao B Dehoff MH Kim S Hayashi T Schwarz MK Huganir RL Seeburg PH Homeostatic scaling requires group I mGluR activation mediated by Homer1aNeuron2010 6811281142

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    Zhong X Li H Chang Q MeCP2 phosphorylation is required for modulating synaptic scaling through mGluR5J Neurosci2012 321284112847

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    Volk LJ Pfeiffer BE Gibson JR Huber KM Multiple Gq-coupled receptors converge on a common protein synthesis-dependent long-term depression that is affected in fragile X syndrome mental retardationJ Neurosci2007 271162411634

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  83. 83.

    Connor SA Hoeffer CA Klann E Nguyen PV Fragile X mental retardation protein regulates heterosynaptic plasticity in the hippocampusLearn Mem2011 18207220

    Not in our library10.1101/lm.2043811

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    Godfraind JM Reyniers E De Boulle K D'Hooge R De Deyn PP Bakker CE Oostra BA Kooy RF Willems PJ Long-term potentiation in the hippocampus of fragile X knockout miceAm J Med Genet1996 64246251

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  85. 85.

    Li J Pelletier MR Perez Velazquez JL Carlen PL Reduced cortical synaptic plasticity and GluR1 expression associated with fragile X mental retardation protein deficiencyMol Cell Neurosci2002 19138151

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  86. 86.

    Hayashi ML Rao BS Seo JS Choi HS Dolan BM Choi SY Chattarji S Tonegawa S Inhibition of p21-activated kinase rescues symptoms of fragile X syndrome in miceProc Natl Acad Sci USA2007 1041148911494

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    Zhao MG Toyoda H Ko SW Ding HK Wu LJ Zhuo M Deficits in trace fear memory and long-term potentiation in a mouse model for fragile X syndromeJ Neurosci2005 2573857392

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  88. 88.

    Suvrathan A Hoeffer CA Wong H Klann E Chattarji S Characterization and reversal of synaptic defects in the amygdala in a mouse model of fragile X syndromeProc Natl Acad Sci USA2010 1071159111596

    Not in our library10.1073/pnas.1002262107

  89. 89.

    Wilson BM Cox CL Absence of metabotropic glutamate receptor-mediated plasticity in the neocortex of fragile X miceProc Natl Acad Sci USA2007 10424542459

    Not in our library10.1073/pnas.0610875104

  90. 90.

    Brown V Jin P Ceman S Darnell JC O'Donnell WT Tenenbaum SA Jin X Feng Y Wilkinson KD Keene JD Microarray identification of FMRP-associated brain mRNAs and altered mRNA translational profiles in fragile X syndromeCell2001 107477487

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  91. 91.

    Jung H Yoon BC Holt CE Axonal mRNA localization and local protein synthesis in nervous system assembly, maintenance and repairNat Rev Neurosci2012 13308324

    Not in our library10.1038/nrn3210

  92. 92.

    Akins MR Berk-Rauch HE Fallon JR Presynaptic translation: stepping out of the postsynaptic shadowFront Neural Circuits2009 317

    Not in our library10.3389/neuro.04.017.2009

  93. 93.

    Price TJ Melemedjian OK Fragile X mental retardation protein (FMRP) and the spinal sensory systemResults Probl Cell Differ2012 544159

    Not in our library10.1007/978-3-642-21649-7_4

  94. 94.

    Price TJ Rashid MH Millecamps M Sanoja R Entrena JM Cervero F Decreased nociceptive sensitization in mice lacking the fragile X mental retardation protein: role of mGluR1/5 and mTORJ Neurosci2007 271395813967

    Not in our library10.1523/jneurosci.4383-07.2007

  95. 95.

    Davidkova G Carroll RC Characterization of the role of microtubule-associated protein 1B in metabotropic glutamate receptor-mediated endocytosis of AMPA receptors in hippocampusJ Neurosci2007 271327313278

    Not in our library10.1523/jneurosci.3334-07.2007

  96. 96.

    Lu R Wang H Liang Z Ku L O'Donnell WT Li W Warren ST Feng Y The fragile X protein controls microtubule-associated protein 1B translation and microtubule stability in brain neuron developmentProc Natl Acad Sci USA2004 1011520115206

    Not in our library10.1073/pnas.0404995101

  97. 97.

    Darnell JC Jensen KB Jin P Brown V Warren ST Darnell RB Fragile X mental retardation protein targets G quartet mRNAs important for neuronal functionCell2001 107489499

    Not in our library10.1016/s0092-8674(01)00566-9

  98. 98.

    Zalfa F Giorgi M Primerano B Moro A Di Penta A Reis S Oostra B Bagni C The fragile X syndrome protein FMRP associates with BC1 RNA and regulates the translation of specific mRNAs at synapsesCell2003 112317327

    Not in our library10.1016/s0092-8674(03)00079-5

  99. 99.

    Wei ZX Yi YH Sun WW Wang R Su T Bai YJ Liao WP Expression changes of microtubule associated protein 1B in the brain of Fmr1 knockout miceNeurosci Bull2007 23203208

    Not in our library10.1007/s12264-007-0030-1

  100. 100.

    Chowdhury S Shepherd JD Okuno H Lyford G Petralia RS Plath N Kuhl D Huganir RL Worley PF Arc/Arg3.1 interacts with the endocytic machinery to regulate AMPA receptor traffickingNeuron2006 52445459

    Not in our library10.1016/j.neuron.2006.08.033

  101. 101.

    Waung MW Pfeiffer BE Nosyreva ED Ronesi JA Huber KM Rapid translation of Arc/Arg3.1 selectively mediates mGluR-dependent LTD through persistent increases in AMPAR endocytosis rateNeuron2008 598497

    Not in our library10.1016/j.neuron.2008.05.014

  102. 102.

    Park S Park JM Kim S Kim JA Shepherd JD Smith-Hicks CL Chowdhury S Kaufmann W Kuhl D Ryazanov AG Elongation factor 2 and fragile X mental retardation protein control the dynamic translation of Arc/Arg3.1 essential for mGluR-LTDNeuron2008 597083

    Not in our library10.1016/j.neuron.2008.05.023

  103. 103.

    Shepherd JD Bear MF New views of Arc, a master regulator of synaptic plasticityNat Neurosci2011 14279284

    Not in our library10.1038/nn.2708

  104. 104.

    Plath N Ohana O Dammermann B Errington ML Schmitz D Gross C Mao X Engelsberg A Mahlke C Welzl H Arc/Arg3.1 is essential for the consolidation of synaptic plasticity and memoriesNeuron2006 52437444

    Not in our library10.1016/j.neuron.2006.08.024

  105. 105.

    Niere F Wilkerson JR Huber KM Evidence for a fragile X mental retardation protein-mediated translational switch in metabotropic glutamate receptor-triggered Arc translation and long-term depressionJ Neurosci2012 3259245936

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  106. 106.

    Iacoangeli A Rozhdestvensky TS Dolzhanskaya N Tournier B Schutt J Brosius J Denman RB Khandjian EW Kindler S Tiedge H On BC1 RNA and the fragile X mental retardation proteinProc Natl Acad Sci USA2008 105734739

    Not in our library10.1073/pnas.0710991105

  107. 107.

    Zhang Y Venkitaramani DV Gladding CM Kurup P Molnar E Collingridge GL Lombroso PJ The tyrosine phosphatase STEP mediates AMPA receptor endocytosis after metabotropic glutamate receptor stimulationJ Neurosci2008 281056110566

    Not in our library10.1523/jneurosci.2666-08.2008

  108. 108.

    Goebel-Goody SM Baum M Paspalas CD Fernandez SM Carty NC Kurup P Lombroso PJ Therapeutic implications for striatal-enriched protein tyrosine phosphatase (STEP) in neuropsychiatric disordersPharmacol Rev2012 646587

    Not in our library10.1124/pr.110.003053

  109. 109.

    Goebel-Goody SM Wilson-Wallis ED Royston S Tagliatela SM Naegele JR Lombroso PJ Genetic manipulation of STEP reverses behavioral abnormalities in a fragile X syndrome mouse modelGenes Brain Behav2012 11586600

    Not in our library10.1111/j.1601-183x.2012.00781.x

  110. 110.
    FMRP Mediates mGluR5-Dependent Translation of Amyloid Precursor Protein · 2007
    No notice
  111. 111.

    Westmark CJ Westmark PR O'Riordan KJ Ray BC Hervey CM Salamat MS Abozeid SH Stein KM Stodola LA Tranfaglia M Reversal of fragile X phenotypes by manipulation of AbetaPP/Abeta levels in Fmr1KO micePLoS One2011 6e26549

    Not in our library10.1371/journal.pone.0026549

  112. 112.

    Nadif Kasri N Nakano-Kobayashi A Van Aelst L Rapid synthesis of the X-linked mental retardation protein OPHN1 mediates mGluR-dependent LTD through interaction with the endocytic machineryNeuron2011 72300315

    Not in our library10.1016/j.neuron.2011.09.001

  113. 113.

    Muddashetty RS Kelic S Gross C Xu M Bassell GJ Dysregulated metabotropic glutamate receptor-dependent translation of AMPA receptor and postsynaptic density-95 mRNAs at synapses in a mouse model of fragile X syndromeJ Neurosci2007 2753385348

    Not in our library10.1523/jneurosci.0937-07.2007

  114. 114.

    Todd PK Mack KJ Malter JS The fragile X mental retardation protein is required for type-I metabotropic glutamate receptor-dependent translation of PSD-95Proc Natl Acad Sci USA2003 1001437414378

    Not in our library10.1073/pnas.2336265100

  115. 115.

    Zalfa F Eleuteri B Dickson KS Mercaldo V De Rubeis S di Penta A Tabolacci E Chiurazzi P Neri G Grant SG Bagni C A new function for the fragile X mental retardation protein in regulation of PSD-95 mRNA stabilityNat Neurosci2007 10578587

    Not in our library10.1038/nn1893

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    Gross C Nakamoto M Yao X Chan CB Yim SY Ye K Warren ST Bassell GJ Excess phosphoinositide 3-kinase subunit synthesis and activity as a novel therapeutic target in fragile X syndromeJ Neurosci2010 301062410638

    Not in our library10.1523/jneurosci.0402-10.2010

  117. 117.

    Lee HY Jan LY Fragile X syndrome: mechanistic insights and therapeutic avenues regarding the role of potassium channelsCurr Opin Neurobiol2012 2218

    Not in our library10.1016/j.conb.2012.01.004

  118. 118.

    Lee HY Ge WP Huang W He Y Wang GX Rowson-Baldwin A Smith SJ Jan YN Jan LY Bidirectional regulation of dendritic voltage-gated potassium channels by the fragile X mental retardation proteinNeuron2011 72630642

    Not in our library10.1016/j.neuron.2011.09.033

  119. 119.

    Gross C Yao X Pong DL Jeromin A Bassell GJ Fragile X mental retardation protein regulates protein expression and mRNA translation of the potassium channel Kv4.2J Neurosci2011 3156935698

    Not in our library10.1523/jneurosci.6661-10.2011

  120. 120.

    Strumbos JG Brown MR Kronengold J Polley DB Kaczmarek LK Fragile X mental retardation protein is required for rapid experience-dependent regulation of the potassium channel Kv3.1bJ Neurosci2010 301026310271

    Not in our library10.1523/jneurosci.1125-10.2010

  121. 121.

    Brown MR Kronengold J Gazula VR Chen Y Strumbos JG Sigworth FJ Navaratnam D Kaczmarek LK Fragile X mental retardation protein controls gating of the sodium-activated potassium channel SlackNat Neurosci2010 13819821

    Not in our library10.1038/nn.2563

  122. 122.

    Zhang Y Brown MR Hyland C Chen Y Kronengold J Fleming MR Kohn AB Moroz LL Kaczmarek LK Regulation of neuronal excitability by interaction of fragile x mental retardation protein with slack potassium channelsJ Neurosci2012 321531815327

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  123. 123.

    Chen X Yuan LL Zhao C Birnbaum SG Frick A Jung WE Schwarz TL Sweatt JD Johnston D Deletion of Kv4.2 gene eliminates dendritic A-type K+ current and enhances induction of long-term potentiation in hippocampal CA1 pyramidal neuronsJ Neurosci2006 261214312151

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  124. 124.

    Hoffman DA Magee JC Colbert CM Johnston D K+ channel regulation of signal propagation in dendrites of hippocampal pyramidal neuronsNature1997 387869875

    Not in our library10.1038/43119

  125. 125.

    Watanabe S Hoffman DA Migliore M Johnston D Dendritic K+ channels contribute to spike-timing dependent long-term potentiation in hippocampal pyramidal neuronsProc Natl Acad Sci USA2002 9983668371

    Not in our library10.1073/pnas.122210599

  126. 126.

    Jung SC Kim J Hoffman DA Rapid, bidirectional remodeling of synaptic NMDA receptor subunit composition by A-type K+ channel activity in hippocampal CA1 pyramidal neuronsNeuron2008 60657671

    Not in our library10.1016/j.neuron.2008.08.029

  127. 127.

    Chuang SC Zhao W Bauchwitz R Yan Q Bianchi R Wong RK Prolonged epileptiform discharges induced by altered group I metabotropic glutamate receptor-mediated synaptic responses in hippocampal slices of a fragile X mouse modelJ Neurosci2005 2580488055

    Not in our library10.1523/jneurosci.1777-05.2005

  128. 128.

    Krueger DD Osterweil EK Chen SP Tye LD Bear MF Cognitive dysfunction and prefrontal synaptic abnormalities in a mouse model of fragile X syndromeProc Natl Acad Sci USA2011 10825872592

    Not in our library10.1073/pnas.1013855108

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    Bolduc FV Bell K Cox H Broadie KS Tully T Excess protein synthesis in Drosophila fragile X mutants impairs long-term memoryNat Neurosci2008 1111431145

    Not in our library10.1038/nn.2175

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