{"gene":"SYNCRIP","run_date":"2026-06-10T10:51:54","timeline":{"discoveries":[{"year":2000,"finding":"SYNCRIP was identified as a cytoplasmic RNA-binding protein that interacts with ubiquitous synaptotagmin isoforms (Syt-VII, Syt-VIII, Syt-IX) through their C2B domains, as shown by in vitro binding experiments and co-immunoprecipitation in COS cells. SYNCRIP binds poly(A) RNA and localizes predominantly to the cytoplasm in contrast to the nuclear localization of its paralog hnRNP R.","method":"Co-immunoprecipitation, in vitro binding assays, biochemical fractionation, immunohistochemistry","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP and in vitro binding with fractionation, single lab","pmids":["10734137"],"is_preprint":false},{"year":2000,"finding":"GRY-RBP (SYNCRIP) was identified as a component of the apoB mRNA editosome; it binds to APOBEC1 and ACF, and also binds apoB RNA directly. GRY-RBP competitively inhibits ACF binding to apoB RNA and suppresses C-to-U RNA editing; antisense knockdown in rat hepatoma cells increased apoB C-to-U editing.","method":"Yeast two-hybrid, recombinant protein binding assays, antisense knockdown, immunofluorescence co-localization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (two-hybrid, recombinant pulldown, cellular knockdown), replicated in two independent papers (PMID 11134005 and 11352648)","pmids":["11134005","11352648"],"is_preprint":false},{"year":2002,"finding":"SYNCRIP (gry-rbp/hnRNP-Q) physically interacts with SMN (survival motor neuron protein) via yeast two-hybrid and the interaction is lost with truncated or SMA-associated mutant SMN forms, placing SYNCRIP in the SMN pathway relevant to motor neuron RNA processing.","method":"Yeast two-hybrid","journal":"Human molecular genetics","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — yeast two-hybrid with mutant validation, single lab, not confirmed by reciprocal Co-IP in mammalian cells","pmids":["11773003"],"is_preprint":false},{"year":2002,"finding":"SYNCRIP/NSAP1 was identified as a tyrosine-phosphorylated protein (pp68) in adipocytes; it associates with free polysomes in low-density microsomes, and RNA binding to SYNCRIP specifically inhibits its in vitro phosphorylation by the insulin receptor, suggesting regulation of mRNA metabolism by insulin signaling.","method":"MALDI mass spectrometry, subcellular fractionation, in vitro kinase assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1-2 / Weak — in vitro kinase assay and fractionation, single lab, single study","pmids":["11994298"],"is_preprint":false},{"year":2004,"finding":"SYNCRIP is a component of mRNA transport granules in rat hippocampal neuron dendrites; fluorescent protein-tagged SYNCRIP granules move bi-directionally in dendrites at ~0.05 μm/s in a microtubule-dependent manner (inhibited by nocodazole), and SYNCRIP co-transports with Staufen1 and the IP3R1 mRNA 3'UTR.","method":"Time-lapse live imaging, pharmacological inhibition (nocodazole), co-immunoprecipitation, fluorescence co-localization","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Moderate — live imaging with functional pharmacological validation and co-transport assays, multiple orthogonal methods in single study","pmids":["15475564"],"is_preprint":false},{"year":2004,"finding":"SYNCRIP binds both positive- and negative-strand 5' UTR leader sequences (UCUAA repeat) of mouse hepatitis virus (MHV) RNA; overexpression or siRNA knockdown of SYNCRIP modulates MHV RNA synthesis (knockdown delays synthesis), identifying SYNCRIP as a positive regulator of MHV RNA replication without affecting viral translation.","method":"UV cross-linking, RNA affinity purification, MALDI-MS, siRNA knockdown, in vivo/in vitro binding","journal":"Journal of virology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple biochemical and functional methods, single lab","pmids":["15542667"],"is_preprint":false},{"year":2006,"finding":"NSAP1 (SYNCRIP) enhances BiP IRES-mediated translation by directly binding the IRES element; NSAP1 binding to the BiP IRES increases under heat stress, and knockdown by siRNA reduces BiP IRES activity and shifts BiP mRNA from heavy to light polysomes.","method":"siRNA knockdown, luciferase reporter assay, polysome fractionation, RNA-protein binding assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple orthogonal functional methods (reporter assay, polysome profiling, RNA binding), single lab","pmids":["17074807"],"is_preprint":false},{"year":2006,"finding":"hnRNPQ3 (NSAP1/SYNCRIP) is a substrate for PRMT1-mediated arginine methylation at its C-terminal RGG box domain; methylation is required for nuclear localization, as inhibition of methylation with Adox causes redistribution of hnRNP Q from nucleus to cytoplasm.","method":"Yeast two-hybrid, in vitro methylation assay, Adox inhibitor treatment, immunofluorescence","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro methylation plus cellular localization rescue, single lab","pmids":["16765914"],"is_preprint":false},{"year":2006,"finding":"The N-terminal acidic domain (AcD) of hnRNPQ (SYNCRIP) directly interacts with APOBEC1 via in vitro pull-down; this interaction is regulated by phosphorylation of AcD by protein kinase C, which induces conformational changes confirmed by NMR spectroscopy and mass spectrometry.","method":"In vitro pull-down, NMR structural modeling, in vitro phosphorylation, mass spectrometry","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 1-2 / Weak — in vitro structural and biochemical data, single lab, limited functional validation","pmids":["17010310"],"is_preprint":false},{"year":2007,"finding":"SYNCRIP directly binds BC200 RNA (a dendritic translational regulator) via its N-terminal RNA recognition motifs and the internal A-rich region of BC200 RNA; SYNCRIP associates with BC200 RNA in vivo in human brain as shown by immunoprecipitation, and may recruit BC200 RNA into neuronal mRNA transport complexes.","method":"In vitro binding assay, immunoprecipitation from human brain","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — in vitro domain mapping plus in vivo co-IP in brain tissue, single lab","pmids":["18045242"],"is_preprint":false},{"year":2007,"finding":"hnRNP Q (SYNCRIP) acts as an IRES trans-acting factor (ITAF) for rhythmic translation of AANAT mRNA via a conserved 5'UTR IRES element, with peak binding at night; hnRNP Q knockdown in pinealocytes reduces peak AANAT protein amplitude and melatonin production without affecting mRNA levels.","method":"siRNA knockdown, IRES reporter assay, RNA immunoprecipitation, melatonin measurement","journal":"Genes & development","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (reporter assay, RIP, functional knockdown), single lab","pmids":["17403780"],"is_preprint":false},{"year":2008,"finding":"hnRNP Q1 (major isoform of SYNCRIP) directly binds SMN2 exon 7 near nucleotide +6 and promotes exon 7 inclusion in SMN2 splicing, while minor isoforms Q2/Q3 antagonize Q1 and promote exon skipping; depletion of all three isoforms also enhances exon 7 inclusion, demonstrating isoform-specific splicing modulation.","method":"Affinity chromatography, RNA binding assay, overexpression, siRNA depletion, RT-PCR splicing assay","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal functional methods, isoform-specific dissection, single lab","pmids":["18794368"],"is_preprint":false},{"year":2009,"finding":"SYNCRIP associates with detergent-resistant membrane fractions and co-localizes with newly synthesized HCV RNA; siRNA knockdown significantly decreases HCV RNA levels in replicon cells, and immunodepletion of SYNCRIP impairs in vitro HCV RNA replication, identifying SYNCRIP as a direct positive regulator of HCV RNA replication in addition to its previously reported role in IRES-mediated translation.","method":"siRNA knockdown, subcellular fractionation, in vitro replication assay, immunodepletion","journal":"Virology","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — in vitro reconstitution (immunodepletion replication assay) plus cellular knockdown, single lab","pmids":["19232660"],"is_preprint":false},{"year":2009,"finding":"Under stress conditions (PMA, thapsigargin, arsenite, heat shock), hnRNP Q (normally predominantly nuclear) re-localizes to cytoplasmic granules where it co-localizes with the ER chaperone BiP, and partially with stress granule marker TIA-1.","method":"Immunofluorescence, stress treatment, co-localization analysis","journal":"Experimental cell research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization imaging under multiple conditions, single lab, no functional consequence directly tied","pmids":["19331829"],"is_preprint":false},{"year":2010,"finding":"hnRNP Q (SYNCRIP) and PTB modulate IRES-mediated translation of Rev-erbα clock protein; hnRNP Q rhythmically binds the Rev-erbα 5'UTR IRES, and this rhythmic binding affinity combined with changes in PTB cytosolic levels maintains Rev-erbα protein oscillation.","method":"IRES reporter assay, RNA binding assay, siRNA knockdown, co-immunoprecipitation","journal":"Nucleic acids research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional reporter plus RNA binding and knockdown, single lab","pmids":["20576698"],"is_preprint":false},{"year":2011,"finding":"NSAP1 (SYNCRIP) facilitates formation of translation-competent 48S ribosome-mRNA complex on HCV IRES by positioning HCV mRNA on the 40S ribosomal subunit; NSAP1 associates with the solvent side of the 40S subunit and directly binds a specific site downstream of the initiation codon and a 40S ribosomal protein.","method":"Ribosome assembly assay, toeprinting, RNA-protein binding, sucrose gradient sedimentation","journal":"Nucleic acids research","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution of ribosomal complex formation with mechanistic detail, single lab","pmids":["21715376"],"is_preprint":false},{"year":2011,"finding":"mhnRNP Q (SYNCRIP) acts as an ITAF for IRES-mediated translation of mPer1 mRNA; hnRNP Q rhythmically binds the mPer1 5'UTR IRES in a phase-dependent manner, and knockdown of hnRNP Q decreases mPER1 protein levels and slightly delays its expression without affecting mRNA levels.","method":"IRES reporter assay, RNA immunoprecipitation, siRNA knockdown, immunoblotting","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay, RIP, knockdown, single lab","pmids":["22124155"],"is_preprint":false},{"year":2012,"finding":"hnRNP Q (SYNCRIP) binds the 5'UTR of mouse p53 mRNA and regulates translation efficiency; changes in cytosolic hnRNP Q levels contribute to cell cycle-dependent translational differences in p53 mRNA, with hnRNP Q knockdown or overexpression altering p53 protein levels and affecting apoptosis progression.","method":"RNA binding assay, IRES reporter assay, siRNA knockdown, overexpression, immunoblotting","journal":"Cell death and differentiation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA binding and functional translation assays, single lab","pmids":["22935615"],"is_preprint":false},{"year":2012,"finding":"hnRNP Q1 (SYNCRIP) regulates neuronal morphogenesis by binding and localizing mRNAs encoding components of the Cdc42/N-WASP/Arp2/3 actin nucleation complex in neurites; knockdown of hnRNP Q increases neurite complexity and filopodium formation, reduces Cdc42 pathway mRNAs in neurites, and this phenotype is rescued by dominant-negative Cdc42 or N-WASP mutants.","method":"shRNA knockdown, immunofluorescence, subcellular fractionation, RNA immunoprecipitation, dominant-negative rescue","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (fractionation, RIP, genetic rescue), specific pathway placement, single lab","pmids":["22493061"],"is_preprint":false},{"year":2012,"finding":"Drosophila Syncrip (ortholog of SYNCRIP) specifically binds gurken and oskar but not bicoid mRNAs; loss-of-function and overexpression of syncrip in egg chambers show it is required for correct grk and osk mRNA localization and translational regulation, identifying Syncrip as a new factor in oocyte axis specification.","method":"RNA chromatography, genetic loss-of-function/overexpression, RNA localization assay (in situ hybridization)","journal":"Biology open","confidence":"High","confidence_rationale":"Tier 2 / Moderate — biochemical binding plus genetic loss/gain-of-function with specific mRNA localization readout, single lab","pmids":["23213441"],"is_preprint":false},{"year":2013,"finding":"hnRNP-Q2 (SYNCRIP isoform 2) competes with PABP for binding to poly(A) RNA; when bound, it displaces PABP, impairs eIF4E association with the 5' cap, and inhibits 48S and 80S ribosome complex formation, thereby suppressing global cap-dependent and IRES-mediated translation in a poly(A)-dependent manner. hnRNP-Q2 also impedes let-7a miRNA-mediated deadenylation of target mRNAs.","method":"In vitro translation assay, ribosome complex analysis, poly(A) binding competition assay, siRNA depletion, recombinant protein reconstitution","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with mechanistic dissection (48S/80S assembly, PABP competition), single lab but multiple orthogonal methods","pmids":["23700384"],"is_preprint":false},{"year":2013,"finding":"hnRNP Q specifically interacts with the regulatory element (RE) in the YB-1 mRNA 3'UTR and inhibits its translation; hnRNP Q binding displaces PABP (a positive regulator) from the RE and increases binding of YB-1 protein (a negative regulator) to the same element.","method":"RNA pulldown, in vitro translation assay, competition binding assay","journal":"Biochemistry. Biokhimiia","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — RNA pulldown and translation assay, single lab, single study","pmids":["23980891"],"is_preprint":false},{"year":2014,"finding":"Drosophila Syncrip associates with mRNAs encoding synaptic proteins (msp-300, syd-1, neurexin-1, futsch, highwire, discs large, α-spectrin) via RNA-immunoprecipitation sequencing at the neuromuscular junction; loss of syncrip reduces MSP-300 and Discs large protein levels and causes muscle nuclear distribution defects characteristic of msp-300 mutants, demonstrating a role in translational regulation of synaptic plasticity genes.","method":"RNA immunoprecipitation followed by high-throughput sequencing (RIP-seq), qRT-PCR, genetic null mutant analysis","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Moderate — RIP-seq plus genetic loss-of-function with specific protein-level phenotype, single lab","pmids":["25171822"],"is_preprint":false},{"year":2014,"finding":"SYNCRIP binds to the 3'UTR of Nox2 mRNA and stabilizes it; in M2-polarized macrophages, SYNCRIP binding to Nox2 mRNA 3'UTR is attenuated, leading to Nox2 mRNA destabilization and reduced ROS production, identified by mRNA pulldown coupled to mass spectrometry.","method":"mRNA pulldown, mass spectrometry, siRNA knockdown, ROS measurement","journal":"Antioxidants & redox signaling","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — mRNA pulldown + MS identification + functional knockdown, single lab","pmids":["24844655"],"is_preprint":false},{"year":2014,"finding":"Drosophila Syncrip is expressed in muscle (not motoneuron) at the NMJ and modulates retrograde BMP signaling by regulating the level of the BMP ligand Glass Bottom Boat from the post-synapse, thereby influencing pre-synaptic vesicle release efficiency and synapse structure.","method":"Genetic null mutant analysis, tissue-specific expression, immunostaining, electrophysiology","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic epistasis with tissue-specific readout, single lab","pmids":["25171887"],"is_preprint":false},{"year":2016,"finding":"SYNCRIP is a component of the hepatocyte exosomal miRNA sorting machinery; SYNCRIP knockdown impairs miRNA sorting into exosomes, and SYNCRIP directly binds to specific miRNAs enriched in exosomes via a common extra-seed sequence (hEXO motif). Embedding the hEXO motif into a poorly exported miRNA enhances its exosomal loading.","method":"shRNA knockdown, RNA immunoprecipitation, miRNA profiling, mutagenesis of hEXO motif","journal":"Cell reports","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (RIP, knockdown, motif mutagenesis), replicated in subsequent structural study (PMID 29483512)","pmids":["27732855"],"is_preprint":false},{"year":2016,"finding":"hnRNP Q (SYNCRIP) binds to the 5'UTR of mCry1 mRNA and suppresses its translation, leading to altered rhythmicity of the mCRY1 protein profile in circadian clock regulation.","method":"RNA binding assay, IRES reporter assay, siRNA knockdown, immunoblotting","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — RNA binding and reporter assay, single lab, single study","pmids":["27392095"],"is_preprint":false},{"year":2016,"finding":"The NMR structure of the SYNCRIP N-terminal acidic domain (AcD24-107) reveals an all α-helix globular fold that is fundamentally different from previously proposed models; it contains a large hydrophobic cavity and distinct charged surface areas as potential interaction epitopes, consistent with its role in protein-protein interactions with APOBEC1.","method":"NMR structure determination","journal":"Protein science","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — NMR structure but limited functional mutagenesis validation, single lab","pmids":["27081926"],"is_preprint":false},{"year":2017,"finding":"SYNCRIP is required for myeloid leukemia stem cell maintenance; SYNCRIP depletion increases apoptosis and differentiation, delays leukemogenesis, and causes loss of HOXA9 translation. SYNCRIP and MSI2 interact indirectly through shared mRNA targets, and MSI2 or HOXA9 overexpression rescues the effects of SYNCRIP depletion.","method":"Proteomic analysis of MSI2 interactome, shRNA functional screen, gene expression profiling, in vivo leukemia model, rescue experiment","journal":"Nature genetics","confidence":"High","confidence_rationale":"Tier 2 / Strong — proteomic identification, in vivo functional validation, genetic epistasis rescue, multiple orthogonal approaches","pmids":["28436985"],"is_preprint":false},{"year":2018,"finding":"Syncrip's N-terminal domain is a cryptic, sequence-specific RNA-binding domain (designated NURR) that specifically recognizes the short hEXO sequence of exosomal miRNA targets; NURR is coupled by a non-canonical structural element to Syncrip's RRM domains, requiring both NURR (for hEXO recognition) and RRM domains (for 5' flanking sequence binding) for high-affinity miRNA binding and exosomal partitioning.","method":"X-ray crystallography/NMR structural analysis, mutagenesis, binding assays, functional exosomal partitioning assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 / Strong — structure determination with functional mutagenesis validation, multiple methods in single rigorous study","pmids":["29483512"],"is_preprint":false},{"year":2019,"finding":"SYNCRIP interacts with full-length SMN (but not truncated forms) and binds and modulates motor neuron transcripts including SMN itself and NRXN2 via motif 7; SYNCRIP overexpression rescues SMA motor neurons by increasing SMN and NRXN2 levels through a positive loop, and ameliorates SMN-loss-related phenotypes in C. elegans and mouse models.","method":"RNA-seq, motif enrichment analysis, co-immunoprecipitation, overexpression in SMA models (human neurons, C. elegans, mouse)","journal":"Brain","confidence":"High","confidence_rationale":"Tier 2 / Strong — Co-IP plus in vivo rescue in multiple model organisms, mechanistic pathway placement","pmids":["30649277"],"is_preprint":false},{"year":2019,"finding":"hnRNP Q (SYNCRIP) acts as an IRES trans-acting factor (ITAF) for IRES-mediated fmr1 translation in neurons; semaphorin 3A (Sema3A)-induced axonal growth cone collapse triggers upregulation of hnRNP Q, which in turn promotes IRES-mediated FMRP expression.","method":"IRES reporter assay, siRNA knockdown, neuronal stimulation assay, immunoblotting","journal":"Molecular and cellular biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional reporter assay plus stimulus-response experiment, single lab","pmids":["30478144"],"is_preprint":false},{"year":2019,"finding":"hnRNP Q (SYNCRIP) binds to the 3'UTR of VRK2 mRNA in neuronal cells and reduces its mRNA stability; reduced SYNCRIP levels in neurons lead to decreased CCT4 protein and increased polyQ protein aggregation in neuroblastoma cells and cortical neurons.","method":"RNA binding assay, mRNA stability assay, siRNA knockdown, immunoblotting, polyQ aggregation assay","journal":"Journal of neurochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RNA binding and functional mRNA stability with cellular phenotype, single lab","pmids":["30488434"],"is_preprint":false},{"year":2019,"finding":"hnRNP Q (SYNCRIP) rhythmically binds to a specific region of the Bmal1 mRNA 5'UTR and negatively regulates its translation in a time-dependent manner; hnRNP Q knockdown increases BMAL1 protein oscillation amplitude and modulates BMAL1-regulated target gene mRNA oscillations.","method":"RNAi, luciferase reporter assay, RNA binding assay, real-time bioluminescence","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assay plus RNA binding and oscillation measurement, single lab","pmids":["30948510"],"is_preprint":false},{"year":2020,"finding":"SYNCRIP promotes processing of pri-let-7a miRNA by associating with the microprocessor complex and binding specifically to the terminal loop of pri-let-7a via its RRM2-3 domains; SYNCRIP knockdown impairs and overexpression promotes let-7a maturation.","method":"Co-immunoprecipitation with Drosha/DGCR8, RNA binding assay, siRNA knockdown, miRNA profiling, luciferase reporter","journal":"RNA (New York, N.Y.)","confidence":"High","confidence_rationale":"Tier 2 / Moderate — Co-IP with microprocessor, domain mapping, gain/loss-of-function, single lab with multiple methods","pmids":["31907208"],"is_preprint":false},{"year":2020,"finding":"Drosophila Syncrip (Syp) binds msp300 (Nesprin-1) transcripts and is essential for activity-dependent accumulation of MSP-300 protein at postsynaptic compartments; elevated neural activity alters Syp dynamics and the number of msp300:Syp:eIF4E RNP granules at the NMJ synapse, implicating Syp in activity-dependent translational regulation.","method":"Single-molecule imaging, co-immunoprecipitation, live imaging, genetic loss-of-function","journal":"The Journal of cell biology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — single-molecule imaging plus genetic loss-of-function with quantitative granule dynamics, single lab","pmids":["32040548"],"is_preprint":false},{"year":2020,"finding":"Drosophila Syncrip binds long 3'UTR isoforms of prospero mRNA in neurons and stabilizes them, enabling upregulation of Prospero protein; neuronal-specific transcription of long prospero mRNA isoforms combined with Syncrip-mediated stabilization constitutes a regulatory module for neuron-specific gene expression.","method":"Single molecule FISH, RNA immunoprecipitation, genetic analysis, mRNA stability assay","journal":"Biology open","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — smFISH plus RIP and genetic analysis, single lab","pmids":["32205310"],"is_preprint":false},{"year":2020,"finding":"SYNCRIP's cytoplasmic mRNA interactome in rat cortical neurons, identified by iCLIP, includes hundreds of target mRNAs enriched for neurogenesis and neurite outgrowth genes; SYNCRIP stabilizes pro-neural mRNAs (e.g., doublecortin/Dcx) via direct 3'UTR binding and synergizes with miR-9 to repress anti-neural mRNAs.","method":"iCLIP (individual-nucleotide resolution CLIP), RNA-seq, subcellular fractionation","journal":"RNA biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genome-wide iCLIP with functional follow-up, single lab","pmids":["33030396"],"is_preprint":false},{"year":2021,"finding":"hnRNP Q and hnRNP A1 competitively regulate translation of Cfl1 (cofilin) mRNA; under normal conditions hnRNP Q binding to Cfl1 mRNA 5'UTR displaces hnRNP A1, suppressing translation; under oxygen-glucose deprivation, changes in localization of hnRNP Q increase hnRNP A1 binding and cofilin translation, promoting cofilin-actin aggregate formation.","method":"RNA pulldown, competition binding assay, in vitro translation, immunoblotting, fluorescence imaging","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — RNA binding competition and translation assay, single lab, single study","pmids":["34944075"],"is_preprint":false},{"year":2023,"finding":"SYNCRIP acts as an endogenous suppressor of APOBEC3B-driven mutagenesis in prostate cancer; SYNCRIP loss leads to overactivated APOBEC3B, which introduces driver mutations in FOXA1, EP300, and other genes, enabling androgen receptor-targeted therapy resistance.","method":"SYNCRIP knockout, genomic sequencing, functional screening, mutational signature analysis","journal":"Cancer cell","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional genetic screen with genomic sequencing, single lab","pmids":["37478850"],"is_preprint":false},{"year":2023,"finding":"SYNCRIP is required for hematopoietic stem cell (HSC) maintenance and proteostasis; SYNCRIP loss increases protein synthesis, dysregulates the epichaperome, causes misfolded protein accumulation and ER stress. SYNCRIP is required for translation of CDC42, and loss impairs polarity and asymmetric protein segregation in HSCs; forced CDC42 expression recovers polarity and replating activity.","method":"Conditional knockout mouse, polysome profiling, proteomics, immunofluorescence, transplantation assay, rescue experiment","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KO mouse model, multiple orthogonal methods (proteomics, translation, cellular phenotype, rescue), single lab","pmids":["37085479"],"is_preprint":false},{"year":2024,"finding":"SYNCRIP binds to the 3'UTR of Ccr2 mRNA and stabilizes it in dorsal root ganglion neurons; SYNCRIP knockdown attenuates nerve injury-induced CCR2 upregulation and nociceptive hypersensitivity, while AAV-mediated SYNCRIP overexpression elevates CCR2 and induces neuropathic pain-like symptoms in naive mice.","method":"siRNA knockdown, AAV overexpression, RNA binding assay (3'UTR binding), behavioral pain assays, immunohistochemistry","journal":"British journal of anaesthesia","confidence":"High","confidence_rationale":"Tier 2 / Moderate — direct RNA binding plus bidirectional functional validation (knockdown and overexpression) with in vivo pain phenotype, single lab","pmids":["39244479"],"is_preprint":false},{"year":2024,"finding":"hnRNP Q (SYNCRIP) interacts with LIN28B in an RNA-dependent manner and modulates the LIN28B/let-7 axis; hnRNP Q knockdown increases let-7 family miRNA levels, reduces LIN28B mRNA and its target TRIM71, and inhibits proliferation of hepatocellular carcinoma cells.","method":"Co-immunoprecipitation (RNA-dependent), siRNA knockdown, luciferase reporter assay, miRNA profiling","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2-3 / Moderate — Co-IP plus functional assays, single lab","pmids":["38976670"],"is_preprint":false},{"year":2025,"finding":"PCBP2 directly interacts with miRNAs bearing intracellular retention motifs and requires SYNCRIP for this binding (as shown by SYNCRIP knockdown abolishing PCBP2-miRNA interaction); SYNCRIP and PCBP2 can simultaneously bind miRNAs (EMSA); PCBP2 acts as a dominant inhibitor of SYNCRIP-mediated miRNA loading into extracellular vesicles.","method":"CLIP, RNA pulldown with proteomics, mutagenesis, EMSA, siRNA knockdown, EV miRNA profiling","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1-2 / Moderate — multiple rigorous biochemical methods (CLIP, EMSA, mutagenesis) with functional EV loading readout, single lab","pmids":["40601477"],"is_preprint":false},{"year":2026,"finding":"SYNCRIP is required for late-phase stress granule clearance; SYNCRIP knockdown specifically increases granule size at 50 minutes post-stress recovery without affecting stress granule formation, placing SYNCRIP as a late-phase disassembly factor in the stress granule lifecycle.","method":"Time-resolved proximity proteomics (G3BP1 bait), siRNA knockdown, stress granule quantification by imaging","journal":"The international journal of biochemistry & cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — proximity proteomics plus functional knockdown with imaging phenotype, single lab, single study","pmids":["42061552"],"is_preprint":false},{"year":2025,"finding":"Syncrip (SYNCRIP) maintains transcription factor expression needed for late-stage cortical neurogenesis by recruiting mRNA stabilization complexes through phase separation; pathogenic human SYNCRIP mutations weaken phase-separation capability, impairing stable complex formation and disrupting Notch signaling that determines radial glial cell fate.","method":"Conditional knockout in mice, single-cell RNA sequencing, phase separation assays, behavioral tests","journal":"Advanced science","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KO with scRNA-seq and phase separation assay, single lab","pmids":["39776340"],"is_preprint":false}],"current_model":"SYNCRIP (hnRNP Q/NSAP1) is a multifunctional cytoplasmic RNA-binding protein whose N-terminal NURR domain and three RRM domains enable sequence-specific binding to target mRNAs and miRNAs; it regulates translation (acting as an IRES trans-acting factor for multiple mRNAs including AANAT, Per1, Rev-erbα, Bmal1, p53, BiP, FMRP, and CDC42, and competing with PABP to suppress global translation), controls mRNA stability (stabilizing Nox2, CCR2, prospero, and VRK2 mRNAs via 3'UTR binding), mediates selective exosomal miRNA sorting through hEXO-motif recognition (antagonized by PCBP2), modulates pre-mRNA splicing (promoting SMN2 exon 7 inclusion), facilitates viral RNA replication (MHV and HCV), localizes in microtubule-dependent dendritic mRNA transport granules, undergoes nuclear import regulated by PRMT1-mediated arginine methylation of its RGG domain, and is required for leukemia stem cell maintenance, hematopoietic proteostasis, neuronal morphogenesis, synaptic plasticity, and cortical neurogenesis."},"narrative":{"mechanistic_narrative":"SYNCRIP (hnRNP Q/NSAP1/GRY-RBP) is a multifunctional cytoplasmic RNA-binding protein that controls the post-transcriptional fate of selected mRNAs and miRNAs through sequence-specific binding, governing translation, mRNA stability, RNA sorting, and RNP granule dynamics [PMID:10734137, PMID:29483512]. Its modular architecture couples an N-terminal cryptic RNA-binding domain (NURR) that recognizes a short hEXO sequence to canonical RRM domains that read flanking sequence, an arrangement required for high-affinity miRNA binding and for selective sorting of miRNAs into exosomes/extracellular vesicles—a function antagonized by PCBP2 [PMID:29483512, PMID:27732855, PMID:40601477]. A major role of SYNCRIP is as an IRES trans-acting factor and translational regulator: it directly binds 5'UTR IRES or regulatory elements to tune translation of clock and stress mRNAs (AANAT, Per1, Rev-erbα, Bmal1, Cry1), BiP, p53, and FMRP, often in a rhythmic or stimulus-dependent manner [PMID:17403780, PMID:17074807, PMID:20576698, PMID:30948510, PMID:22935615, PMID:30478144], while isoform hnRNP-Q2 competes with PABP at poly(A) tails to broadly suppress cap- and IRES-dependent translation [PMID:23700384]. SYNCRIP also stabilizes target transcripts through 3'UTR binding (Nox2, VRK2, Ccr2, prospero) and promotes neuronal pro-neural mRNA stability via iCLIP-defined targets and cooperation with miR-9 [PMID:24844655, PMID:30488434, PMID:39244479, PMID:32205310, PMID:33030396]. In neurons it localizes to microtubule-dependent dendritic transport granules with Staufen1 and regulates morphogenesis by localizing Cdc42/N-WASP/Arp2/3 pathway mRNAs [PMID:15475564, PMID:22493061], and its Drosophila ortholog directs localization and translation of oskar/gurken and synaptic mRNAs at the NMJ [PMID:23213441, PMID:25171822, PMID:32040548]. Beyond translation, SYNCRIP modulates SMN2 exon 7 splicing in an isoform-specific manner and participates in let-7a biogenesis via the microprocessor [PMID:18794368, PMID:31907208], suppresses apoB and APOBEC3B-driven C-to-U/cytidine deaminase activity [PMID:11134005, PMID:11352648, PMID:37478850], and supports HCV and MHV viral RNA replication [PMID:19232660, PMID:21715376, PMID:15542667]. At the cellular-systems level, SYNCRIP is required for myeloid leukemia stem cell maintenance through HOXA9 translation, hematopoietic stem cell proteostasis through CDC42 translation, and cortical neurogenesis through phase-separation–dependent mRNA stabilization complexes, with pathogenic human mutations weakening this phase-separation capacity [PMID:28436985, PMID:37085479, PMID:39776340].","teleology":[{"year":2000,"claim":"Established SYNCRIP as a distinct cytoplasmic poly(A) RNA-binding protein, distinguishing it from its nuclear paralog and linking it to synaptotagmin-associated machinery.","evidence":"Co-IP, in vitro binding, and fractionation in COS cells; identification as an apoB editosome component binding APOBEC1/ACF","pmids":["10734137","11134005","11352648"],"confidence":"High","gaps":["Functional consequence of synaptotagmin interaction not resolved","Mechanism of editing suppression beyond competition not detailed"]},{"year":2002,"claim":"Placed SYNCRIP in the SMN/motor-neuron RNA-processing pathway and showed insulin-signaling-coupled phosphoregulation of its RNA metabolism functions.","evidence":"Yeast two-hybrid with SMA mutant SMN forms; MALDI-MS identification of tyrosine-phosphorylated pp68 and in vitro insulin receptor kinase assay","pmids":["11773003","11994298"],"confidence":"Medium","gaps":["SMN interaction not confirmed by reciprocal Co-IP in mammalian cells at this stage","In vivo relevance of insulin-receptor phosphorylation untested"]},{"year":2004,"claim":"Demonstrated SYNCRIP is a motile component of dendritic mRNA transport granules, defining a role in spatial mRNA delivery in neurons.","evidence":"Live imaging of FP-tagged granules with nocodazole inhibition and co-transport with Staufen1 and IP3R1 3'UTR in hippocampal neurons","pmids":["15475564"],"confidence":"High","gaps":["Cargo selectivity rules not defined","Link between transport and local translation not established here"]},{"year":2006,"claim":"Defined SYNCRIP as an IRES trans-acting factor and arginine-methylation substrate, explaining both a translational activity and the control of its nucleocytoplasmic distribution.","evidence":"BiP IRES reporter/polysome assays under heat stress; PRMT1 in vitro methylation with Adox-induced cytoplasmic redistribution","pmids":["17074807","16765914","17010310"],"confidence":"High","gaps":["How methylation status switches between functions in vivo unclear","Generality of IRES enhancement across mRNAs not yet shown"]},{"year":2007,"claim":"Extended SYNCRIP's RNA targets to noncoding dendritic regulatory RNAs and rhythmic translation of melatonin biosynthesis.","evidence":"Domain-mapped in vitro binding and human brain IP for BC200; IRES reporter/RIP/melatonin assays for AANAT in pinealocytes","pmids":["18045242","17403780"],"confidence":"High","gaps":["Functional role of BC200 binding in transport not demonstrated","Upstream signal driving rhythmic AANAT binding not identified"]},{"year":2008,"claim":"Showed isoform-specific, position-dependent control of alternative splicing, identifying SYNCRIP as an SMN2 exon 7 splicing modulator.","evidence":"Affinity chromatography, isoform overexpression/depletion, and RT-PCR splicing assays mapping binding near exon 7 +6","pmids":["18794368"],"confidence":"High","gaps":["Mechanism by which Q2/Q3 antagonize Q1 unresolved","Nuclear vs cytoplasmic isoform distribution not integrated"]},{"year":2009,"claim":"Identified SYNCRIP as a positive host factor for viral RNA replication and a stress-responsive granule component.","evidence":"siRNA knockdown and in vitro immunodepletion replication assays for HCV; stress-induced relocalization to BiP/TIA-1 granules by immunofluorescence","pmids":["19232660","19331829"],"confidence":"High","gaps":["Direct role of SYNCRIP in the replication complex vs IRES translation not fully separated","Functional consequence of stress-granule localization untied to phenotype"]},{"year":2011,"claim":"Provided mechanistic detail of SYNCRIP positioning mRNA on the 40S ribosome and extended rhythmic IRES regulation to a second clock gene.","evidence":"In vitro ribosome assembly/toeprinting on HCV IRES; mPer1 IRES reporter/RIP/knockdown","pmids":["21715376","22124155"],"confidence":"High","gaps":["Identity of the contacted 40S ribosomal protein not fully characterized","How phase-dependent binding is timed not resolved"]},{"year":2012,"claim":"Connected SYNCRIP to cell-fate decisions and cytoskeletal mRNA localization across translation control, neuronal morphogenesis, and oocyte axis specification.","evidence":"p53 5'UTR translation assays; shRNA + RIP + dominant-negative rescue mapping Cdc42/N-WASP/Arp2/3 mRNA localization; Drosophila syncrip genetics on grk/osk","pmids":["22935615","22493061","23213441"],"confidence":"High","gaps":["Whether morphogenesis effect is via transport vs translation not separated","Conservation of axis-specification mechanism in mammals unknown"]},{"year":2013,"claim":"Defined a global translational repressor mode in which SYNCRIP competes with PABP at poly(A) tails and at specific 3'UTR elements.","evidence":"In vitro reconstitution of 48S/80S assembly with PABP competition; YB-1 3'UTR pulldown and translation assays","pmids":["23700384","23980891"],"confidence":"High","gaps":["Determinants selecting global vs target-specific repression unclear","Isoform usage governing the switch not defined"]},{"year":2014,"claim":"Established 3'UTR-mediated mRNA stabilization (Nox2) and an in vivo synaptic/translational role at the Drosophila NMJ.","evidence":"mRNA pulldown/MS and ROS assays for Nox2; RIP-seq and genetic null analysis of synaptic mRNAs and BMP signaling at the NMJ","pmids":["24844655","25171822","25171887"],"confidence":"High","gaps":["How SYNCRIP toggles between stabilizing and destabilizing outcomes unresolved","Direct vs indirect control of BMP ligand levels not dissected"]},{"year":2016,"claim":"Discovered hEXO-motif–based selective sorting of miRNAs into exosomes and extended IRES/translational control to additional clock genes.","evidence":"shRNA/RIP/miRNA profiling and hEXO motif mutagenesis in hepatocytes; NMR of the N-terminal acidic domain; mCry1 5'UTR translation assays","pmids":["27732855","27081926","27392095"],"confidence":"High","gaps":["Structural basis of hEXO recognition not yet solved at this point","How sorting integrates with translational roles unclear"]},{"year":2017,"claim":"Identified SYNCRIP as a requirement for myeloid leukemia stem cell maintenance via HOXA9 translation within an MSI2-shared target network.","evidence":"MSI2 interactome proteomics, shRNA screen, in vivo leukemia model, and MSI2/HOXA9 rescue","pmids":["28436985"],"confidence":"High","gaps":["Direct vs indirect MSI2 relationship not fully resolved","Mechanism of HOXA9 translational control not detailed"]},{"year":2018,"claim":"Solved how the NURR domain combines with RRMs to achieve sequence-specific miRNA recognition and exosomal partitioning.","evidence":"Crystallographic/NMR structural analysis with mutagenesis and functional partitioning assays","pmids":["29483512"],"confidence":"High","gaps":["In vivo regulation of NURR-RRM coupling unknown","Full repertoire of hEXO-bearing targets not defined"]},{"year":2019,"claim":"Consolidated SYNCRIP's neuronal functions—SMA rescue, axon-guidance-coupled FMRP translation, mRNA stability control of proteostasis, and circadian Bmal1 translation.","evidence":"Co-IP/RNA-seq/motif analysis and in vivo SMA rescue across models; fmr1 IRES reporter under Sema3A; VRK2 3'UTR stability assays; Bmal1 5'UTR rhythmic translation","pmids":["30649277","30478144","30488434","30948510"],"confidence":"High","gaps":["Therapeutic window of SYNCRIP overexpression in SMA untested here","Coordination across these neuronal targets not integrated"]},{"year":2020,"claim":"Expanded SYNCRIP into miRNA biogenesis and genome-wide neuronal RNA regulation alongside activity-dependent synaptic translation.","evidence":"Co-IP with Drosha/DGCR8 and domain-mapped pri-let-7a loop binding; iCLIP neuronal interactome with miR-9 cooperation; single-molecule imaging of msp300:Syp:eIF4E granules; prospero long-3'UTR stabilization","pmids":["31907208","33030396","32040548","32205310"],"confidence":"High","gaps":["How SYNCRIP couples microprocessor activity to its other roles unclear","Rules distinguishing stabilized vs repressed iCLIP targets undefined"]},{"year":2021,"claim":"Defined competitive translational regulation with hnRNP A1 at the Cfl1 5'UTR linking SYNCRIP localization to ischemic cytoskeletal pathology.","evidence":"RNA pulldown competition and in vitro translation under oxygen-glucose deprivation","pmids":["34944075"],"confidence":"Medium","gaps":["RNA binding competition and translation assay from a single lab/study","Trigger relocalizing hnRNP Q under OGD not defined"]},{"year":2023,"claim":"Revealed SYNCRIP as a tumor-suppressive restraint on APOBEC3B mutagenesis and an essential factor for hematopoietic stem cell proteostasis via CDC42 translation.","evidence":"SYNCRIP knockout + genomic/mutational signature analysis in prostate cancer; conditional KO mouse with polysome profiling, proteomics, and CDC42 rescue in HSCs","pmids":["37478850","37085479"],"confidence":"High","gaps":["Mechanism by which SYNCRIP loss activates APOBEC3B not detailed","How proteostasis and translation control are mechanistically linked unclear"]},{"year":2024,"claim":"Extended SYNCRIP's 3'UTR-stabilization function to nociceptive signaling and showed RNA-dependent partnership with LIN28B in the let-7 axis.","evidence":"siRNA/AAV bidirectional manipulation with Ccr2 3'UTR binding and pain behavior; RNA-dependent Co-IP with LIN28B and let-7/TRIM71 readouts in HCC cells","pmids":["39244479","38976670"],"confidence":"High","gaps":["Direct vs indirect LIN28B interaction mechanism unresolved","Whether Ccr2 stabilization uses the same machinery as other 3'UTR targets unknown"]},{"year":2025,"claim":"Established PCBP2 as a dominant antagonist of SYNCRIP-mediated EV miRNA loading and tied phase-separation–dependent mRNA stabilization complexes to cortical neurogenesis and human disease mutations.","evidence":"CLIP/EMSA/mutagenesis with EV miRNA profiling showing PCBP2 requires SYNCRIP; conditional KO + scRNA-seq + phase-separation assays linking SYNCRIP mutations to Notch-dependent radial glial fate","pmids":["40601477","39776340"],"confidence":"Medium","gaps":["How PCBP2 converts SYNCRIP-bound miRNAs to retained pool not fully resolved","Molecular composition of phase-separated stabilization complex undefined"]},{"year":2026,"claim":"Positioned SYNCRIP as a late-phase stress granule disassembly factor, integrating its RNP-granule biology with stress recovery.","evidence":"Time-resolved G3BP1 proximity proteomics and siRNA knockdown with stress granule imaging","pmids":["42061552"],"confidence":"Medium","gaps":["Proximity proteomics + knockdown from single study","Molecular mechanism of granule clearance not defined"]},{"year":null,"claim":"It remains unresolved how SYNCRIP's isoform identity, arginine methylation, phosphorylation, and phase-separation collectively switch it between translational activation, repression, mRNA stabilization, splicing, and miRNA sorting on specific targets.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No unified model linking post-translational modifications to functional mode-switching","Determinants of target selection across competing functions undefined","In vivo coordination of cytoplasmic vs nuclear roles unclear"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0003723","term_label":"RNA binding","supporting_discovery_ids":[0,4,6,9,10,20,23,25,29,34,37,41]},{"term_id":"GO:0045182","term_label":"translation regulator activity","supporting_discovery_ids":[6,10,14,16,17,20,31,33,38]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[1,11,20,21,43]},{"term_id":"GO:0140098","term_label":"catalytic activity, acting on RNA","supporting_discovery_ids":[34]}],"localization":[{"term_id":"GO:0005829","term_label":"cytosol","supporting_discovery_ids":[0,3,4,13,37]},{"term_id":"GO:0005634","term_label":"nucleus","supporting_discovery_ids":[7,13]},{"term_id":"GO:0031410","term_label":"cytoplasmic vesicle","supporting_discovery_ids":[4,13,44]}],"pathway":[{"term_id":"R-HSA-8953854","term_label":"Metabolism of RNA","supporting_discovery_ids":[11,20,25,34,43]},{"term_id":"R-HSA-392499","term_label":"Metabolism of proteins","supporting_discovery_ids":[6,10,15,20,40]},{"term_id":"R-HSA-9909396","term_label":"Circadian clock","supporting_discovery_ids":[10,14,16,26,33]},{"term_id":"R-HSA-112316","term_label":"Neuronal System","supporting_discovery_ids":[4,18,22,30,37]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[28,39]},{"term_id":"R-HSA-8953897","term_label":"Cellular responses to stimuli","supporting_discovery_ids":[6,13,44]}],"complexes":["apoB mRNA editosome","Microprocessor (Drosha/DGCR8)","mRNA transport granule","exosomal miRNA sorting machinery"],"partners":["SMN","APOBEC1","PABP","MSI2","STAUFEN1","PCBP2","LIN28B","PRMT1"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"O60506","full_name":"Heterogeneous nuclear ribonucleoprotein Q","aliases":["Glycine- and tyrosine-rich RNA-binding protein","GRY-RBP","NS1-associated protein 1","Synaptotagmin-binding, cytoplasmic RNA-interacting protein"],"length_aa":623,"mass_kda":69.6,"function":"Heterogenous nuclear ribonucleoprotein (hnRNP) implicated in mRNA processing mechanisms. Component of the CRD-mediated complex that promotes MYC mRNA stability. Isoform 1, isoform 2 and isoform 3 are associated in vitro with pre-mRNA, splicing intermediates and mature mRNA protein complexes. Isoform 1 binds to apoB mRNA AU-rich sequences. Isoform 1 is part of the APOB mRNA editosome complex and may modulate the postranscriptional C to U RNA-editing of the APOB mRNA through either by binding to A1CF (APOBEC1 complementation factor), to APOBEC1 or to RNA itself. May be involved in translationally coupled mRNA turnover. Implicated with other RNA-binding proteins in the cytoplasmic deadenylation/translational and decay interplay of the FOS mRNA mediated by the major coding-region determinant of instability (mCRD) domain. Interacts in vitro preferentially with poly(A) and poly(U) RNA sequences. Isoform 3 may be involved in cytoplasmic vesicle-based mRNA transport through interaction with synaptotagmins. Component of the GAIT (gamma interferon-activated inhibitor of translation) complex which mediates interferon-gamma-induced transcript-selective translation inhibition in inflammation processes. Upon interferon-gamma activation assembles into the GAIT complex which binds to stem loop-containing GAIT elements in the 3'-UTR of diverse inflammatory mRNAs (such as ceruplasmin) and suppresses their translation; does not seem to be essential for GAIT complex function","subcellular_location":"Nucleus, nucleoplasm","url":"https://www.uniprot.org/uniprotkb/O60506/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/SYNCRIP","classification":"Not Classified","n_dependent_lines":367,"n_total_lines":1208,"dependency_fraction":0.3038079470198676},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"DDX21","stoichiometry":4.0},{"gene":"HNRNPL","stoichiometry":4.0},{"gene":"IGF2BP1","stoichiometry":4.0},{"gene":"CAPZB","stoichiometry":0.2},{"gene":"CLNS1A","stoichiometry":0.2},{"gene":"CPSF6","stoichiometry":0.2},{"gene":"DDX6","stoichiometry":0.2},{"gene":"DHX9","stoichiometry":0.2},{"gene":"GSPT1","stoichiometry":0.2},{"gene":"HNRNPC","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/SYNCRIP","total_profiled":1310},"omim":[{"mim_id":"616686","title":"SYNAPTOTAGMIN-BINDING CYTOPLASMIC RNA-INTERACTING PROTEIN; SYNCRIP","url":"https://www.omim.org/entry/616686"},{"mim_id":"600950","title":"ARYLALKYLAMINE N-ACETYLTRANSFERASE; AANAT","url":"https://www.omim.org/entry/600950"},{"mim_id":"301136","title":"RBMX-LIKE PROTEIN 3; RBMXL3","url":"https://www.omim.org/entry/301136"},{"mim_id":"138295","title":"GLUTAMYL-PROLYL-tRNA SYNTHETASE 1; EPRS1","url":"https://www.omim.org/entry/138295"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Uncertain","locations":[{"location":"Nucleoplasm","reliability":"Uncertain"},{"location":"Vesicles","reliability":"Additional"},{"location":"Cytosol","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/SYNCRIP"},"hgnc":{"alias_symbol":["NSAP1","GRY-RBP","dJ3J17.2","HNRPQ1","hnRNP-Q","HNRNPQ"],"prev_symbol":[]},"alphafold":{"accession":"O60506","domains":[{"cath_id":"-","chopping":"25-107","consensus_level":"high","plddt":90.214,"start":25,"end":107},{"cath_id":"3.30.70.330","chopping":"120-237","consensus_level":"high","plddt":92.7586,"start":120,"end":237},{"cath_id":"3.30.70.330","chopping":"243-321","consensus_level":"high","plddt":88.1704,"start":243,"end":321},{"cath_id":"3.30.70.330","chopping":"330-404","consensus_level":"high","plddt":92.1036,"start":330,"end":404}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/O60506","model_url":"https://alphafold.ebi.ac.uk/files/AF-O60506-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-O60506-F1-predicted_aligned_error_v6.png","plddt_mean":70.56},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=SYNCRIP","jax_strain_url":"https://www.jax.org/strain/search?query=SYNCRIP"},"sequence":{"accession":"O60506","fasta_url":"https://rest.uniprot.org/uniprotkb/O60506.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/O60506/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/O60506"}},"corpus_meta":[{"pmid":"27732855","id":"PMC_27732855","title":"The 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cytoplasmic RNA-binding protein that interacts with ubiquitous synaptotagmin isoforms (Syt-VII, Syt-VIII, Syt-IX) through their C2B domains, as shown by in vitro binding experiments and co-immunoprecipitation in COS cells. SYNCRIP binds poly(A) RNA and localizes predominantly to the cytoplasm in contrast to the nuclear localization of its paralog hnRNP R.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding assays, biochemical fractionation, immunohistochemistry\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP and in vitro binding with fractionation, single lab\",\n      \"pmids\": [\"10734137\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"GRY-RBP (SYNCRIP) was identified as a component of the apoB mRNA editosome; it binds to APOBEC1 and ACF, and also binds apoB RNA directly. GRY-RBP competitively inhibits ACF binding to apoB RNA and suppresses C-to-U RNA editing; antisense knockdown in rat hepatoma cells increased apoB C-to-U editing.\",\n      \"method\": \"Yeast two-hybrid, recombinant protein binding assays, antisense knockdown, immunofluorescence co-localization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (two-hybrid, recombinant pulldown, cellular knockdown), replicated in two independent papers (PMID 11134005 and 11352648)\",\n      \"pmids\": [\"11134005\", \"11352648\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"SYNCRIP (gry-rbp/hnRNP-Q) physically interacts with SMN (survival motor neuron protein) via yeast two-hybrid and the interaction is lost with truncated or SMA-associated mutant SMN forms, placing SYNCRIP in the SMN pathway relevant to motor neuron RNA processing.\",\n      \"method\": \"Yeast two-hybrid\",\n      \"journal\": \"Human molecular genetics\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — yeast two-hybrid with mutant validation, single lab, not confirmed by reciprocal Co-IP in mammalian cells\",\n      \"pmids\": [\"11773003\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"SYNCRIP/NSAP1 was identified as a tyrosine-phosphorylated protein (pp68) in adipocytes; it associates with free polysomes in low-density microsomes, and RNA binding to SYNCRIP specifically inhibits its in vitro phosphorylation by the insulin receptor, suggesting regulation of mRNA metabolism by insulin signaling.\",\n      \"method\": \"MALDI mass spectrometry, subcellular fractionation, in vitro kinase assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Weak — in vitro kinase assay and fractionation, single lab, single study\",\n      \"pmids\": [\"11994298\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SYNCRIP is a component of mRNA transport granules in rat hippocampal neuron dendrites; fluorescent protein-tagged SYNCRIP granules move bi-directionally in dendrites at ~0.05 μm/s in a microtubule-dependent manner (inhibited by nocodazole), and SYNCRIP co-transports with Staufen1 and the IP3R1 mRNA 3'UTR.\",\n      \"method\": \"Time-lapse live imaging, pharmacological inhibition (nocodazole), co-immunoprecipitation, fluorescence co-localization\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — live imaging with functional pharmacological validation and co-transport assays, multiple orthogonal methods in single study\",\n      \"pmids\": [\"15475564\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"SYNCRIP binds both positive- and negative-strand 5' UTR leader sequences (UCUAA repeat) of mouse hepatitis virus (MHV) RNA; overexpression or siRNA knockdown of SYNCRIP modulates MHV RNA synthesis (knockdown delays synthesis), identifying SYNCRIP as a positive regulator of MHV RNA replication without affecting viral translation.\",\n      \"method\": \"UV cross-linking, RNA affinity purification, MALDI-MS, siRNA knockdown, in vivo/in vitro binding\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple biochemical and functional methods, single lab\",\n      \"pmids\": [\"15542667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"NSAP1 (SYNCRIP) enhances BiP IRES-mediated translation by directly binding the IRES element; NSAP1 binding to the BiP IRES increases under heat stress, and knockdown by siRNA reduces BiP IRES activity and shifts BiP mRNA from heavy to light polysomes.\",\n      \"method\": \"siRNA knockdown, luciferase reporter assay, polysome fractionation, RNA-protein binding assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple orthogonal functional methods (reporter assay, polysome profiling, RNA binding), single lab\",\n      \"pmids\": [\"17074807\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"hnRNPQ3 (NSAP1/SYNCRIP) is a substrate for PRMT1-mediated arginine methylation at its C-terminal RGG box domain; methylation is required for nuclear localization, as inhibition of methylation with Adox causes redistribution of hnRNP Q from nucleus to cytoplasm.\",\n      \"method\": \"Yeast two-hybrid, in vitro methylation assay, Adox inhibitor treatment, immunofluorescence\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro methylation plus cellular localization rescue, single lab\",\n      \"pmids\": [\"16765914\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The N-terminal acidic domain (AcD) of hnRNPQ (SYNCRIP) directly interacts with APOBEC1 via in vitro pull-down; this interaction is regulated by phosphorylation of AcD by protein kinase C, which induces conformational changes confirmed by NMR spectroscopy and mass spectrometry.\",\n      \"method\": \"In vitro pull-down, NMR structural modeling, in vitro phosphorylation, mass spectrometry\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1-2 / Weak — in vitro structural and biochemical data, single lab, limited functional validation\",\n      \"pmids\": [\"17010310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"SYNCRIP directly binds BC200 RNA (a dendritic translational regulator) via its N-terminal RNA recognition motifs and the internal A-rich region of BC200 RNA; SYNCRIP associates with BC200 RNA in vivo in human brain as shown by immunoprecipitation, and may recruit BC200 RNA into neuronal mRNA transport complexes.\",\n      \"method\": \"In vitro binding assay, immunoprecipitation from human brain\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — in vitro domain mapping plus in vivo co-IP in brain tissue, single lab\",\n      \"pmids\": [\"18045242\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"hnRNP Q (SYNCRIP) acts as an IRES trans-acting factor (ITAF) for rhythmic translation of AANAT mRNA via a conserved 5'UTR IRES element, with peak binding at night; hnRNP Q knockdown in pinealocytes reduces peak AANAT protein amplitude and melatonin production without affecting mRNA levels.\",\n      \"method\": \"siRNA knockdown, IRES reporter assay, RNA immunoprecipitation, melatonin measurement\",\n      \"journal\": \"Genes & development\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (reporter assay, RIP, functional knockdown), single lab\",\n      \"pmids\": [\"17403780\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"hnRNP Q1 (major isoform of SYNCRIP) directly binds SMN2 exon 7 near nucleotide +6 and promotes exon 7 inclusion in SMN2 splicing, while minor isoforms Q2/Q3 antagonize Q1 and promote exon skipping; depletion of all three isoforms also enhances exon 7 inclusion, demonstrating isoform-specific splicing modulation.\",\n      \"method\": \"Affinity chromatography, RNA binding assay, overexpression, siRNA depletion, RT-PCR splicing assay\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal functional methods, isoform-specific dissection, single lab\",\n      \"pmids\": [\"18794368\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"SYNCRIP associates with detergent-resistant membrane fractions and co-localizes with newly synthesized HCV RNA; siRNA knockdown significantly decreases HCV RNA levels in replicon cells, and immunodepletion of SYNCRIP impairs in vitro HCV RNA replication, identifying SYNCRIP as a direct positive regulator of HCV RNA replication in addition to its previously reported role in IRES-mediated translation.\",\n      \"method\": \"siRNA knockdown, subcellular fractionation, in vitro replication assay, immunodepletion\",\n      \"journal\": \"Virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — in vitro reconstitution (immunodepletion replication assay) plus cellular knockdown, single lab\",\n      \"pmids\": [\"19232660\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Under stress conditions (PMA, thapsigargin, arsenite, heat shock), hnRNP Q (normally predominantly nuclear) re-localizes to cytoplasmic granules where it co-localizes with the ER chaperone BiP, and partially with stress granule marker TIA-1.\",\n      \"method\": \"Immunofluorescence, stress treatment, co-localization analysis\",\n      \"journal\": \"Experimental cell research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization imaging under multiple conditions, single lab, no functional consequence directly tied\",\n      \"pmids\": [\"19331829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"hnRNP Q (SYNCRIP) and PTB modulate IRES-mediated translation of Rev-erbα clock protein; hnRNP Q rhythmically binds the Rev-erbα 5'UTR IRES, and this rhythmic binding affinity combined with changes in PTB cytosolic levels maintains Rev-erbα protein oscillation.\",\n      \"method\": \"IRES reporter assay, RNA binding assay, siRNA knockdown, co-immunoprecipitation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional reporter plus RNA binding and knockdown, single lab\",\n      \"pmids\": [\"20576698\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"NSAP1 (SYNCRIP) facilitates formation of translation-competent 48S ribosome-mRNA complex on HCV IRES by positioning HCV mRNA on the 40S ribosomal subunit; NSAP1 associates with the solvent side of the 40S subunit and directly binds a specific site downstream of the initiation codon and a 40S ribosomal protein.\",\n      \"method\": \"Ribosome assembly assay, toeprinting, RNA-protein binding, sucrose gradient sedimentation\",\n      \"journal\": \"Nucleic acids research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution of ribosomal complex formation with mechanistic detail, single lab\",\n      \"pmids\": [\"21715376\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"mhnRNP Q (SYNCRIP) acts as an ITAF for IRES-mediated translation of mPer1 mRNA; hnRNP Q rhythmically binds the mPer1 5'UTR IRES in a phase-dependent manner, and knockdown of hnRNP Q decreases mPER1 protein levels and slightly delays its expression without affecting mRNA levels.\",\n      \"method\": \"IRES reporter assay, RNA immunoprecipitation, siRNA knockdown, immunoblotting\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay, RIP, knockdown, single lab\",\n      \"pmids\": [\"22124155\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"hnRNP Q (SYNCRIP) binds the 5'UTR of mouse p53 mRNA and regulates translation efficiency; changes in cytosolic hnRNP Q levels contribute to cell cycle-dependent translational differences in p53 mRNA, with hnRNP Q knockdown or overexpression altering p53 protein levels and affecting apoptosis progression.\",\n      \"method\": \"RNA binding assay, IRES reporter assay, siRNA knockdown, overexpression, immunoblotting\",\n      \"journal\": \"Cell death and differentiation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA binding and functional translation assays, single lab\",\n      \"pmids\": [\"22935615\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"hnRNP Q1 (SYNCRIP) regulates neuronal morphogenesis by binding and localizing mRNAs encoding components of the Cdc42/N-WASP/Arp2/3 actin nucleation complex in neurites; knockdown of hnRNP Q increases neurite complexity and filopodium formation, reduces Cdc42 pathway mRNAs in neurites, and this phenotype is rescued by dominant-negative Cdc42 or N-WASP mutants.\",\n      \"method\": \"shRNA knockdown, immunofluorescence, subcellular fractionation, RNA immunoprecipitation, dominant-negative rescue\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (fractionation, RIP, genetic rescue), specific pathway placement, single lab\",\n      \"pmids\": [\"22493061\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Drosophila Syncrip (ortholog of SYNCRIP) specifically binds gurken and oskar but not bicoid mRNAs; loss-of-function and overexpression of syncrip in egg chambers show it is required for correct grk and osk mRNA localization and translational regulation, identifying Syncrip as a new factor in oocyte axis specification.\",\n      \"method\": \"RNA chromatography, genetic loss-of-function/overexpression, RNA localization assay (in situ hybridization)\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical binding plus genetic loss/gain-of-function with specific mRNA localization readout, single lab\",\n      \"pmids\": [\"23213441\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"hnRNP-Q2 (SYNCRIP isoform 2) competes with PABP for binding to poly(A) RNA; when bound, it displaces PABP, impairs eIF4E association with the 5' cap, and inhibits 48S and 80S ribosome complex formation, thereby suppressing global cap-dependent and IRES-mediated translation in a poly(A)-dependent manner. hnRNP-Q2 also impedes let-7a miRNA-mediated deadenylation of target mRNAs.\",\n      \"method\": \"In vitro translation assay, ribosome complex analysis, poly(A) binding competition assay, siRNA depletion, recombinant protein reconstitution\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with mechanistic dissection (48S/80S assembly, PABP competition), single lab but multiple orthogonal methods\",\n      \"pmids\": [\"23700384\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"hnRNP Q specifically interacts with the regulatory element (RE) in the YB-1 mRNA 3'UTR and inhibits its translation; hnRNP Q binding displaces PABP (a positive regulator) from the RE and increases binding of YB-1 protein (a negative regulator) to the same element.\",\n      \"method\": \"RNA pulldown, in vitro translation assay, competition binding assay\",\n      \"journal\": \"Biochemistry. Biokhimiia\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — RNA pulldown and translation assay, single lab, single study\",\n      \"pmids\": [\"23980891\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Drosophila Syncrip associates with mRNAs encoding synaptic proteins (msp-300, syd-1, neurexin-1, futsch, highwire, discs large, α-spectrin) via RNA-immunoprecipitation sequencing at the neuromuscular junction; loss of syncrip reduces MSP-300 and Discs large protein levels and causes muscle nuclear distribution defects characteristic of msp-300 mutants, demonstrating a role in translational regulation of synaptic plasticity genes.\",\n      \"method\": \"RNA immunoprecipitation followed by high-throughput sequencing (RIP-seq), qRT-PCR, genetic null mutant analysis\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP-seq plus genetic loss-of-function with specific protein-level phenotype, single lab\",\n      \"pmids\": [\"25171822\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"SYNCRIP binds to the 3'UTR of Nox2 mRNA and stabilizes it; in M2-polarized macrophages, SYNCRIP binding to Nox2 mRNA 3'UTR is attenuated, leading to Nox2 mRNA destabilization and reduced ROS production, identified by mRNA pulldown coupled to mass spectrometry.\",\n      \"method\": \"mRNA pulldown, mass spectrometry, siRNA knockdown, ROS measurement\",\n      \"journal\": \"Antioxidants & redox signaling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — mRNA pulldown + MS identification + functional knockdown, single lab\",\n      \"pmids\": [\"24844655\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Drosophila Syncrip is expressed in muscle (not motoneuron) at the NMJ and modulates retrograde BMP signaling by regulating the level of the BMP ligand Glass Bottom Boat from the post-synapse, thereby influencing pre-synaptic vesicle release efficiency and synapse structure.\",\n      \"method\": \"Genetic null mutant analysis, tissue-specific expression, immunostaining, electrophysiology\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis with tissue-specific readout, single lab\",\n      \"pmids\": [\"25171887\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"SYNCRIP is a component of the hepatocyte exosomal miRNA sorting machinery; SYNCRIP knockdown impairs miRNA sorting into exosomes, and SYNCRIP directly binds to specific miRNAs enriched in exosomes via a common extra-seed sequence (hEXO motif). Embedding the hEXO motif into a poorly exported miRNA enhances its exosomal loading.\",\n      \"method\": \"shRNA knockdown, RNA immunoprecipitation, miRNA profiling, mutagenesis of hEXO motif\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (RIP, knockdown, motif mutagenesis), replicated in subsequent structural study (PMID 29483512)\",\n      \"pmids\": [\"27732855\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"hnRNP Q (SYNCRIP) binds to the 5'UTR of mCry1 mRNA and suppresses its translation, leading to altered rhythmicity of the mCRY1 protein profile in circadian clock regulation.\",\n      \"method\": \"RNA binding assay, IRES reporter assay, siRNA knockdown, immunoblotting\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — RNA binding and reporter assay, single lab, single study\",\n      \"pmids\": [\"27392095\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"The NMR structure of the SYNCRIP N-terminal acidic domain (AcD24-107) reveals an all α-helix globular fold that is fundamentally different from previously proposed models; it contains a large hydrophobic cavity and distinct charged surface areas as potential interaction epitopes, consistent with its role in protein-protein interactions with APOBEC1.\",\n      \"method\": \"NMR structure determination\",\n      \"journal\": \"Protein science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — NMR structure but limited functional mutagenesis validation, single lab\",\n      \"pmids\": [\"27081926\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"SYNCRIP is required for myeloid leukemia stem cell maintenance; SYNCRIP depletion increases apoptosis and differentiation, delays leukemogenesis, and causes loss of HOXA9 translation. SYNCRIP and MSI2 interact indirectly through shared mRNA targets, and MSI2 or HOXA9 overexpression rescues the effects of SYNCRIP depletion.\",\n      \"method\": \"Proteomic analysis of MSI2 interactome, shRNA functional screen, gene expression profiling, in vivo leukemia model, rescue experiment\",\n      \"journal\": \"Nature genetics\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — proteomic identification, in vivo functional validation, genetic epistasis rescue, multiple orthogonal approaches\",\n      \"pmids\": [\"28436985\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Syncrip's N-terminal domain is a cryptic, sequence-specific RNA-binding domain (designated NURR) that specifically recognizes the short hEXO sequence of exosomal miRNA targets; NURR is coupled by a non-canonical structural element to Syncrip's RRM domains, requiring both NURR (for hEXO recognition) and RRM domains (for 5' flanking sequence binding) for high-affinity miRNA binding and exosomal partitioning.\",\n      \"method\": \"X-ray crystallography/NMR structural analysis, mutagenesis, binding assays, functional exosomal partitioning assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — structure determination with functional mutagenesis validation, multiple methods in single rigorous study\",\n      \"pmids\": [\"29483512\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"SYNCRIP interacts with full-length SMN (but not truncated forms) and binds and modulates motor neuron transcripts including SMN itself and NRXN2 via motif 7; SYNCRIP overexpression rescues SMA motor neurons by increasing SMN and NRXN2 levels through a positive loop, and ameliorates SMN-loss-related phenotypes in C. elegans and mouse models.\",\n      \"method\": \"RNA-seq, motif enrichment analysis, co-immunoprecipitation, overexpression in SMA models (human neurons, C. elegans, mouse)\",\n      \"journal\": \"Brain\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — Co-IP plus in vivo rescue in multiple model organisms, mechanistic pathway placement\",\n      \"pmids\": [\"30649277\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"hnRNP Q (SYNCRIP) acts as an IRES trans-acting factor (ITAF) for IRES-mediated fmr1 translation in neurons; semaphorin 3A (Sema3A)-induced axonal growth cone collapse triggers upregulation of hnRNP Q, which in turn promotes IRES-mediated FMRP expression.\",\n      \"method\": \"IRES reporter assay, siRNA knockdown, neuronal stimulation assay, immunoblotting\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional reporter assay plus stimulus-response experiment, single lab\",\n      \"pmids\": [\"30478144\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"hnRNP Q (SYNCRIP) binds to the 3'UTR of VRK2 mRNA in neuronal cells and reduces its mRNA stability; reduced SYNCRIP levels in neurons lead to decreased CCT4 protein and increased polyQ protein aggregation in neuroblastoma cells and cortical neurons.\",\n      \"method\": \"RNA binding assay, mRNA stability assay, siRNA knockdown, immunoblotting, polyQ aggregation assay\",\n      \"journal\": \"Journal of neurochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RNA binding and functional mRNA stability with cellular phenotype, single lab\",\n      \"pmids\": [\"30488434\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"hnRNP Q (SYNCRIP) rhythmically binds to a specific region of the Bmal1 mRNA 5'UTR and negatively regulates its translation in a time-dependent manner; hnRNP Q knockdown increases BMAL1 protein oscillation amplitude and modulates BMAL1-regulated target gene mRNA oscillations.\",\n      \"method\": \"RNAi, luciferase reporter assay, RNA binding assay, real-time bioluminescence\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assay plus RNA binding and oscillation measurement, single lab\",\n      \"pmids\": [\"30948510\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SYNCRIP promotes processing of pri-let-7a miRNA by associating with the microprocessor complex and binding specifically to the terminal loop of pri-let-7a via its RRM2-3 domains; SYNCRIP knockdown impairs and overexpression promotes let-7a maturation.\",\n      \"method\": \"Co-immunoprecipitation with Drosha/DGCR8, RNA binding assay, siRNA knockdown, miRNA profiling, luciferase reporter\",\n      \"journal\": \"RNA (New York, N.Y.)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Co-IP with microprocessor, domain mapping, gain/loss-of-function, single lab with multiple methods\",\n      \"pmids\": [\"31907208\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Drosophila Syncrip (Syp) binds msp300 (Nesprin-1) transcripts and is essential for activity-dependent accumulation of MSP-300 protein at postsynaptic compartments; elevated neural activity alters Syp dynamics and the number of msp300:Syp:eIF4E RNP granules at the NMJ synapse, implicating Syp in activity-dependent translational regulation.\",\n      \"method\": \"Single-molecule imaging, co-immunoprecipitation, live imaging, genetic loss-of-function\",\n      \"journal\": \"The Journal of cell biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — single-molecule imaging plus genetic loss-of-function with quantitative granule dynamics, single lab\",\n      \"pmids\": [\"32040548\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Drosophila Syncrip binds long 3'UTR isoforms of prospero mRNA in neurons and stabilizes them, enabling upregulation of Prospero protein; neuronal-specific transcription of long prospero mRNA isoforms combined with Syncrip-mediated stabilization constitutes a regulatory module for neuron-specific gene expression.\",\n      \"method\": \"Single molecule FISH, RNA immunoprecipitation, genetic analysis, mRNA stability assay\",\n      \"journal\": \"Biology open\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — smFISH plus RIP and genetic analysis, single lab\",\n      \"pmids\": [\"32205310\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"SYNCRIP's cytoplasmic mRNA interactome in rat cortical neurons, identified by iCLIP, includes hundreds of target mRNAs enriched for neurogenesis and neurite outgrowth genes; SYNCRIP stabilizes pro-neural mRNAs (e.g., doublecortin/Dcx) via direct 3'UTR binding and synergizes with miR-9 to repress anti-neural mRNAs.\",\n      \"method\": \"iCLIP (individual-nucleotide resolution CLIP), RNA-seq, subcellular fractionation\",\n      \"journal\": \"RNA biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genome-wide iCLIP with functional follow-up, single lab\",\n      \"pmids\": [\"33030396\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"hnRNP Q and hnRNP A1 competitively regulate translation of Cfl1 (cofilin) mRNA; under normal conditions hnRNP Q binding to Cfl1 mRNA 5'UTR displaces hnRNP A1, suppressing translation; under oxygen-glucose deprivation, changes in localization of hnRNP Q increase hnRNP A1 binding and cofilin translation, promoting cofilin-actin aggregate formation.\",\n      \"method\": \"RNA pulldown, competition binding assay, in vitro translation, immunoblotting, fluorescence imaging\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — RNA binding competition and translation assay, single lab, single study\",\n      \"pmids\": [\"34944075\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SYNCRIP acts as an endogenous suppressor of APOBEC3B-driven mutagenesis in prostate cancer; SYNCRIP loss leads to overactivated APOBEC3B, which introduces driver mutations in FOXA1, EP300, and other genes, enabling androgen receptor-targeted therapy resistance.\",\n      \"method\": \"SYNCRIP knockout, genomic sequencing, functional screening, mutational signature analysis\",\n      \"journal\": \"Cancer cell\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional genetic screen with genomic sequencing, single lab\",\n      \"pmids\": [\"37478850\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"SYNCRIP is required for hematopoietic stem cell (HSC) maintenance and proteostasis; SYNCRIP loss increases protein synthesis, dysregulates the epichaperome, causes misfolded protein accumulation and ER stress. SYNCRIP is required for translation of CDC42, and loss impairs polarity and asymmetric protein segregation in HSCs; forced CDC42 expression recovers polarity and replating activity.\",\n      \"method\": \"Conditional knockout mouse, polysome profiling, proteomics, immunofluorescence, transplantation assay, rescue experiment\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KO mouse model, multiple orthogonal methods (proteomics, translation, cellular phenotype, rescue), single lab\",\n      \"pmids\": [\"37085479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"SYNCRIP binds to the 3'UTR of Ccr2 mRNA and stabilizes it in dorsal root ganglion neurons; SYNCRIP knockdown attenuates nerve injury-induced CCR2 upregulation and nociceptive hypersensitivity, while AAV-mediated SYNCRIP overexpression elevates CCR2 and induces neuropathic pain-like symptoms in naive mice.\",\n      \"method\": \"siRNA knockdown, AAV overexpression, RNA binding assay (3'UTR binding), behavioral pain assays, immunohistochemistry\",\n      \"journal\": \"British journal of anaesthesia\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct RNA binding plus bidirectional functional validation (knockdown and overexpression) with in vivo pain phenotype, single lab\",\n      \"pmids\": [\"39244479\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"hnRNP Q (SYNCRIP) interacts with LIN28B in an RNA-dependent manner and modulates the LIN28B/let-7 axis; hnRNP Q knockdown increases let-7 family miRNA levels, reduces LIN28B mRNA and its target TRIM71, and inhibits proliferation of hepatocellular carcinoma cells.\",\n      \"method\": \"Co-immunoprecipitation (RNA-dependent), siRNA knockdown, luciferase reporter assay, miRNA profiling\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2-3 / Moderate — Co-IP plus functional assays, single lab\",\n      \"pmids\": [\"38976670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PCBP2 directly interacts with miRNAs bearing intracellular retention motifs and requires SYNCRIP for this binding (as shown by SYNCRIP knockdown abolishing PCBP2-miRNA interaction); SYNCRIP and PCBP2 can simultaneously bind miRNAs (EMSA); PCBP2 acts as a dominant inhibitor of SYNCRIP-mediated miRNA loading into extracellular vesicles.\",\n      \"method\": \"CLIP, RNA pulldown with proteomics, mutagenesis, EMSA, siRNA knockdown, EV miRNA profiling\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Moderate — multiple rigorous biochemical methods (CLIP, EMSA, mutagenesis) with functional EV loading readout, single lab\",\n      \"pmids\": [\"40601477\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"SYNCRIP is required for late-phase stress granule clearance; SYNCRIP knockdown specifically increases granule size at 50 minutes post-stress recovery without affecting stress granule formation, placing SYNCRIP as a late-phase disassembly factor in the stress granule lifecycle.\",\n      \"method\": \"Time-resolved proximity proteomics (G3BP1 bait), siRNA knockdown, stress granule quantification by imaging\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — proximity proteomics plus functional knockdown with imaging phenotype, single lab, single study\",\n      \"pmids\": [\"42061552\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Syncrip (SYNCRIP) maintains transcription factor expression needed for late-stage cortical neurogenesis by recruiting mRNA stabilization complexes through phase separation; pathogenic human SYNCRIP mutations weaken phase-separation capability, impairing stable complex formation and disrupting Notch signaling that determines radial glial cell fate.\",\n      \"method\": \"Conditional knockout in mice, single-cell RNA sequencing, phase separation assays, behavioral tests\",\n      \"journal\": \"Advanced science\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KO with scRNA-seq and phase separation assay, single lab\",\n      \"pmids\": [\"39776340\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"SYNCRIP (hnRNP Q/NSAP1) is a multifunctional cytoplasmic RNA-binding protein whose N-terminal NURR domain and three RRM domains enable sequence-specific binding to target mRNAs and miRNAs; it regulates translation (acting as an IRES trans-acting factor for multiple mRNAs including AANAT, Per1, Rev-erbα, Bmal1, p53, BiP, FMRP, and CDC42, and competing with PABP to suppress global translation), controls mRNA stability (stabilizing Nox2, CCR2, prospero, and VRK2 mRNAs via 3'UTR binding), mediates selective exosomal miRNA sorting through hEXO-motif recognition (antagonized by PCBP2), modulates pre-mRNA splicing (promoting SMN2 exon 7 inclusion), facilitates viral RNA replication (MHV and HCV), localizes in microtubule-dependent dendritic mRNA transport granules, undergoes nuclear import regulated by PRMT1-mediated arginine methylation of its RGG domain, and is required for leukemia stem cell maintenance, hematopoietic proteostasis, neuronal morphogenesis, synaptic plasticity, and cortical neurogenesis.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"SYNCRIP (hnRNP Q/NSAP1/GRY-RBP) is a multifunctional cytoplasmic RNA-binding protein that controls the post-transcriptional fate of selected mRNAs and miRNAs through sequence-specific binding, governing translation, mRNA stability, RNA sorting, and RNP granule dynamics [#0, #29]. Its modular architecture couples an N-terminal cryptic RNA-binding domain (NURR) that recognizes a short hEXO sequence to canonical RRM domains that read flanking sequence, an arrangement required for high-affinity miRNA binding and for selective sorting of miRNAs into exosomes/extracellular vesicles—a function antagonized by PCBP2 [#29, #25, #43]. A major role of SYNCRIP is as an IRES trans-acting factor and translational regulator: it directly binds 5'UTR IRES or regulatory elements to tune translation of clock and stress mRNAs (AANAT, Per1, Rev-erbα, Bmal1, Cry1), BiP, p53, and FMRP, often in a rhythmic or stimulus-dependent manner [#10, #6, #14, #33, #17, #31], while isoform hnRNP-Q2 competes with PABP at poly(A) tails to broadly suppress cap- and IRES-dependent translation [#20]. SYNCRIP also stabilizes target transcripts through 3'UTR binding (Nox2, VRK2, Ccr2, prospero) and promotes neuronal pro-neural mRNA stability via iCLIP-defined targets and cooperation with miR-9 [#23, #32, #41, #36, #37]. In neurons it localizes to microtubule-dependent dendritic transport granules with Staufen1 and regulates morphogenesis by localizing Cdc42/N-WASP/Arp2/3 pathway mRNAs [#4, #18], and its Drosophila ortholog directs localization and translation of oskar/gurken and synaptic mRNAs at the NMJ [#19, #22, #35]. Beyond translation, SYNCRIP modulates SMN2 exon 7 splicing in an isoform-specific manner and participates in let-7a biogenesis via the microprocessor [#11, #34], suppresses apoB and APOBEC3B-driven C-to-U/cytidine deaminase activity [#1, #39], and supports HCV and MHV viral RNA replication [#12, #15, #5]. At the cellular-systems level, SYNCRIP is required for myeloid leukemia stem cell maintenance through HOXA9 translation, hematopoietic stem cell proteostasis through CDC42 translation, and cortical neurogenesis through phase-separation–dependent mRNA stabilization complexes, with pathogenic human mutations weakening this phase-separation capacity [#28, #40, #45].\",\n  \"teleology\": [\n    {\n      \"year\": 2000,\n      \"claim\": \"Established SYNCRIP as a distinct cytoplasmic poly(A) RNA-binding protein, distinguishing it from its nuclear paralog and linking it to synaptotagmin-associated machinery.\",\n      \"evidence\": \"Co-IP, in vitro binding, and fractionation in COS cells; identification as an apoB editosome component binding APOBEC1/ACF\",\n      \"pmids\": [\"10734137\", \"11134005\", \"11352648\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of synaptotagmin interaction not resolved\", \"Mechanism of editing suppression beyond competition not detailed\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Placed SYNCRIP in the SMN/motor-neuron RNA-processing pathway and showed insulin-signaling-coupled phosphoregulation of its RNA metabolism functions.\",\n      \"evidence\": \"Yeast two-hybrid with SMA mutant SMN forms; MALDI-MS identification of tyrosine-phosphorylated pp68 and in vitro insulin receptor kinase assay\",\n      \"pmids\": [\"11773003\", \"11994298\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"SMN interaction not confirmed by reciprocal Co-IP in mammalian cells at this stage\", \"In vivo relevance of insulin-receptor phosphorylation untested\"]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Demonstrated SYNCRIP is a motile component of dendritic mRNA transport granules, defining a role in spatial mRNA delivery in neurons.\",\n      \"evidence\": \"Live imaging of FP-tagged granules with nocodazole inhibition and co-transport with Staufen1 and IP3R1 3'UTR in hippocampal neurons\",\n      \"pmids\": [\"15475564\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cargo selectivity rules not defined\", \"Link between transport and local translation not established here\"]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defined SYNCRIP as an IRES trans-acting factor and arginine-methylation substrate, explaining both a translational activity and the control of its nucleocytoplasmic distribution.\",\n      \"evidence\": \"BiP IRES reporter/polysome assays under heat stress; PRMT1 in vitro methylation with Adox-induced cytoplasmic redistribution\",\n      \"pmids\": [\"17074807\", \"16765914\", \"17010310\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How methylation status switches between functions in vivo unclear\", \"Generality of IRES enhancement across mRNAs not yet shown\"]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Extended SYNCRIP's RNA targets to noncoding dendritic regulatory RNAs and rhythmic translation of melatonin biosynthesis.\",\n      \"evidence\": \"Domain-mapped in vitro binding and human brain IP for BC200; IRES reporter/RIP/melatonin assays for AANAT in pinealocytes\",\n      \"pmids\": [\"18045242\", \"17403780\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of BC200 binding in transport not demonstrated\", \"Upstream signal driving rhythmic AANAT binding not identified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed isoform-specific, position-dependent control of alternative splicing, identifying SYNCRIP as an SMN2 exon 7 splicing modulator.\",\n      \"evidence\": \"Affinity chromatography, isoform overexpression/depletion, and RT-PCR splicing assays mapping binding near exon 7 +6\",\n      \"pmids\": [\"18794368\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which Q2/Q3 antagonize Q1 unresolved\", \"Nuclear vs cytoplasmic isoform distribution not integrated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Identified SYNCRIP as a positive host factor for viral RNA replication and a stress-responsive granule component.\",\n      \"evidence\": \"siRNA knockdown and in vitro immunodepletion replication assays for HCV; stress-induced relocalization to BiP/TIA-1 granules by immunofluorescence\",\n      \"pmids\": [\"19232660\", \"19331829\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct role of SYNCRIP in the replication complex vs IRES translation not fully separated\", \"Functional consequence of stress-granule localization untied to phenotype\"]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Provided mechanistic detail of SYNCRIP positioning mRNA on the 40S ribosome and extended rhythmic IRES regulation to a second clock gene.\",\n      \"evidence\": \"In vitro ribosome assembly/toeprinting on HCV IRES; mPer1 IRES reporter/RIP/knockdown\",\n      \"pmids\": [\"21715376\", \"22124155\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the contacted 40S ribosomal protein not fully characterized\", \"How phase-dependent binding is timed not resolved\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Connected SYNCRIP to cell-fate decisions and cytoskeletal mRNA localization across translation control, neuronal morphogenesis, and oocyte axis specification.\",\n      \"evidence\": \"p53 5'UTR translation assays; shRNA + RIP + dominant-negative rescue mapping Cdc42/N-WASP/Arp2/3 mRNA localization; Drosophila syncrip genetics on grk/osk\",\n      \"pmids\": [\"22935615\", \"22493061\", \"23213441\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether morphogenesis effect is via transport vs translation not separated\", \"Conservation of axis-specification mechanism in mammals unknown\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined a global translational repressor mode in which SYNCRIP competes with PABP at poly(A) tails and at specific 3'UTR elements.\",\n      \"evidence\": \"In vitro reconstitution of 48S/80S assembly with PABP competition; YB-1 3'UTR pulldown and translation assays\",\n      \"pmids\": [\"23700384\", \"23980891\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Determinants selecting global vs target-specific repression unclear\", \"Isoform usage governing the switch not defined\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Established 3'UTR-mediated mRNA stabilization (Nox2) and an in vivo synaptic/translational role at the Drosophila NMJ.\",\n      \"evidence\": \"mRNA pulldown/MS and ROS assays for Nox2; RIP-seq and genetic null analysis of synaptic mRNAs and BMP signaling at the NMJ\",\n      \"pmids\": [\"24844655\", \"25171822\", \"25171887\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SYNCRIP toggles between stabilizing and destabilizing outcomes unresolved\", \"Direct vs indirect control of BMP ligand levels not dissected\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Discovered hEXO-motif–based selective sorting of miRNAs into exosomes and extended IRES/translational control to additional clock genes.\",\n      \"evidence\": \"shRNA/RIP/miRNA profiling and hEXO motif mutagenesis in hepatocytes; NMR of the N-terminal acidic domain; mCry1 5'UTR translation assays\",\n      \"pmids\": [\"27732855\", \"27081926\", \"27392095\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of hEXO recognition not yet solved at this point\", \"How sorting integrates with translational roles unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identified SYNCRIP as a requirement for myeloid leukemia stem cell maintenance via HOXA9 translation within an MSI2-shared target network.\",\n      \"evidence\": \"MSI2 interactome proteomics, shRNA screen, in vivo leukemia model, and MSI2/HOXA9 rescue\",\n      \"pmids\": [\"28436985\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect MSI2 relationship not fully resolved\", \"Mechanism of HOXA9 translational control not detailed\"]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Solved how the NURR domain combines with RRMs to achieve sequence-specific miRNA recognition and exosomal partitioning.\",\n      \"evidence\": \"Crystallographic/NMR structural analysis with mutagenesis and functional partitioning assays\",\n      \"pmids\": [\"29483512\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo regulation of NURR-RRM coupling unknown\", \"Full repertoire of hEXO-bearing targets not defined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Consolidated SYNCRIP's neuronal functions—SMA rescue, axon-guidance-coupled FMRP translation, mRNA stability control of proteostasis, and circadian Bmal1 translation.\",\n      \"evidence\": \"Co-IP/RNA-seq/motif analysis and in vivo SMA rescue across models; fmr1 IRES reporter under Sema3A; VRK2 3'UTR stability assays; Bmal1 5'UTR rhythmic translation\",\n      \"pmids\": [\"30649277\", \"30478144\", \"30488434\", \"30948510\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Therapeutic window of SYNCRIP overexpression in SMA untested here\", \"Coordination across these neuronal targets not integrated\"]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Expanded SYNCRIP into miRNA biogenesis and genome-wide neuronal RNA regulation alongside activity-dependent synaptic translation.\",\n      \"evidence\": \"Co-IP with Drosha/DGCR8 and domain-mapped pri-let-7a loop binding; iCLIP neuronal interactome with miR-9 cooperation; single-molecule imaging of msp300:Syp:eIF4E granules; prospero long-3'UTR stabilization\",\n      \"pmids\": [\"31907208\", \"33030396\", \"32040548\", \"32205310\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How SYNCRIP couples microprocessor activity to its other roles unclear\", \"Rules distinguishing stabilized vs repressed iCLIP targets undefined\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Defined competitive translational regulation with hnRNP A1 at the Cfl1 5'UTR linking SYNCRIP localization to ischemic cytoskeletal pathology.\",\n      \"evidence\": \"RNA pulldown competition and in vitro translation under oxygen-glucose deprivation\",\n      \"pmids\": [\"34944075\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"RNA binding competition and translation assay from a single lab/study\", \"Trigger relocalizing hnRNP Q under OGD not defined\"]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Revealed SYNCRIP as a tumor-suppressive restraint on APOBEC3B mutagenesis and an essential factor for hematopoietic stem cell proteostasis via CDC42 translation.\",\n      \"evidence\": \"SYNCRIP knockout + genomic/mutational signature analysis in prostate cancer; conditional KO mouse with polysome profiling, proteomics, and CDC42 rescue in HSCs\",\n      \"pmids\": [\"37478850\", \"37085479\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which SYNCRIP loss activates APOBEC3B not detailed\", \"How proteostasis and translation control are mechanistically linked unclear\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Extended SYNCRIP's 3'UTR-stabilization function to nociceptive signaling and showed RNA-dependent partnership with LIN28B in the let-7 axis.\",\n      \"evidence\": \"siRNA/AAV bidirectional manipulation with Ccr2 3'UTR binding and pain behavior; RNA-dependent Co-IP with LIN28B and let-7/TRIM71 readouts in HCC cells\",\n      \"pmids\": [\"39244479\", \"38976670\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct vs indirect LIN28B interaction mechanism unresolved\", \"Whether Ccr2 stabilization uses the same machinery as other 3'UTR targets unknown\"]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established PCBP2 as a dominant antagonist of SYNCRIP-mediated EV miRNA loading and tied phase-separation–dependent mRNA stabilization complexes to cortical neurogenesis and human disease mutations.\",\n      \"evidence\": \"CLIP/EMSA/mutagenesis with EV miRNA profiling showing PCBP2 requires SYNCRIP; conditional KO + scRNA-seq + phase-separation assays linking SYNCRIP mutations to Notch-dependent radial glial fate\",\n      \"pmids\": [\"40601477\", \"39776340\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How PCBP2 converts SYNCRIP-bound miRNAs to retained pool not fully resolved\", \"Molecular composition of phase-separated stabilization complex undefined\"]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Positioned SYNCRIP as a late-phase stress granule disassembly factor, integrating its RNP-granule biology with stress recovery.\",\n      \"evidence\": \"Time-resolved G3BP1 proximity proteomics and siRNA knockdown with stress granule imaging\",\n      \"pmids\": [\"42061552\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Proximity proteomics + knockdown from single study\", \"Molecular mechanism of granule clearance not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how SYNCRIP's isoform identity, arginine methylation, phosphorylation, and phase-separation collectively switch it between translational activation, repression, mRNA stabilization, splicing, and miRNA sorting on specific targets.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No unified model linking post-translational modifications to functional mode-switching\", \"Determinants of target selection across competing functions undefined\", \"In vivo coordination of cytoplasmic vs nuclear roles unclear\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0, 4, 6, 9, 10, 20, 23, 25, 29, 34, 37, 41]},\n      {\"term_id\": \"GO:0045182\", \"supporting_discovery_ids\": [6, 10, 14, 16, 17, 20, 31, 33, 38]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [1, 11, 20, 21, 43]},\n      {\"term_id\": \"GO:0140098\", \"supporting_discovery_ids\": [34]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 3, 4, 13, 37]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [7, 13]},\n      {\"term_id\": \"GO:0031410\", \"supporting_discovery_ids\": [4, 13, 44]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-8953854\", \"supporting_discovery_ids\": [11, 20, 25, 34, 43]},\n      {\"term_id\": \"R-HSA-392499\", \"supporting_discovery_ids\": [6, 10, 15, 20, 40]},\n      {\"term_id\": \"R-HSA-9909396\", \"supporting_discovery_ids\": [10, 14, 16, 26, 33]},\n      {\"term_id\": \"R-HSA-112316\", \"supporting_discovery_ids\": [4, 18, 22, 30, 37]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [28, 39]},\n      {\"term_id\": \"R-HSA-8953897\", \"supporting_discovery_ids\": [6, 13, 44]}\n    ],\n    \"complexes\": [\"apoB mRNA editosome\", \"Microprocessor (Drosha/DGCR8)\", \"mRNA transport granule\", \"exosomal miRNA sorting machinery\"],\n    \"partners\": [\"SMN\", \"APOBEC1\", \"PABP\", \"MSI2\", \"Staufen1\", \"PCBP2\", \"LIN28B\", \"PRMT1\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}