| 1975 |
Tau (MAPT) was identified as a heat-stable protein factor essential for microtubule assembly in vitro. In the absence of tau, tubulin 6S dimers do not polymerize; addition of tau completely restores tubule-forming capacity and converts 6S dimers to 36S rings implicated as polymerization intermediates. |
In vitro microtubule assembly reconstitution with purified porcine brain tau and tubulin; ion exchange chromatography separation |
Proceedings of the National Academy of Sciences of the United States of America |
High |
1057175
|
| 1988 |
Tau protein (encoded by MAPT) was identified as a core component of the paired helical filaments (PHFs) of Alzheimer's disease neurofibrillary tangles by cDNA cloning and sequencing, establishing tau as the major structural constituent of NFTs. |
cDNA library screening with oligonucleotide probes derived from PHF core protein partial sequence; RNA blot analysis; sequence homology to mouse tau |
Proceedings of the National Academy of Sciences of the United States of America |
High |
3131773
|
| 1989 |
Human MAPT undergoes alternative splicing to produce multiple tau isoforms differing by insertions of 29 or 58 amino acids in the N-terminal region and by inclusion of three or four microtubule-binding repeats. The four-repeat isoform and the N-terminal insert isoforms are expressed in an adult-specific manner, whereas the three-repeat isoform is expressed throughout life including fetal brain. All isoforms are incorporated into Alzheimer's disease neurofibrillary tangles. |
cDNA cloning, RNase protection assays, immunostaining with isoform-specific antisera raised against synthetic peptides |
Neuron |
High |
2484340
|
| 1989 |
A four-repeat tau isoform (383 aa) encoded by an additional exon was cloned and shown to be expressed in an adult- and cell-specific manner in human brain; both three- and four-repeat tau isoforms are present in the PHF core of Alzheimer's disease neurofibrillary tangles. |
cDNA cloning, RNA blot analysis, in situ hybridization, immunostaining |
The EMBO journal |
High |
2498079
|
| 1992 |
Tau modulates microtubule dynamic instability by increasing the rate of polymerization, decreasing the catastrophe rate, and inhibiting depolymerization. Phosphorylation by MAP kinase perturbs all three activities by lowering tau's affinity for the microtubule lattice. |
Direct dark-field microscopy observation of individual microtubule dynamics in vitro; kinetic analysis with purified tau; in vitro phosphorylation assay |
Molecular biology of the cell |
High |
1421571
|
| 1998 |
Missense mutations in MAPT (G272V, P301L, R406W) and mutations in the 5' splice site of exon 10 cause FTDP-17. Splice-site mutations destabilize a stem-loop structure regulating exon 10 alternative splicing, increasing the proportion of four-repeat tau isoforms. |
DNA sequencing of MAPT in FTDP-17 families; RNA structural analysis of splice-site mutations; segregation analysis |
Nature |
High |
9641683
|
| 1998 |
A G-to-A intronic mutation after exon 10 of MAPT in familial MSTD/FTDP-17 disrupts a predicted stem-loop structure at the 3' end of the splice-donor site, leading to abnormal preponderance of four-repeat tau isoforms in soluble and insoluble tau fractions. |
DNA sequencing, RNA structural prediction, biochemical isoform analysis of sarkosyl-insoluble tau fractions |
Proceedings of the National Academy of Sciences of the United States of America |
High |
9636220
|
| 1998 |
FTDP-17 missense mutations G272V, P301L, V337M, and R406W in tau markedly reduce the ability of tau to promote microtubule assembly in vitro, demonstrating a partial loss-of-function as the primary effect of these mutations. |
In vitro microtubule assembly assay with recombinant mutant tau proteins; turbidimetry |
FEBS letters |
High |
9824291
|
| 1998 |
Functional analyses of FTDP-17 missense mutations showed that most reduce tau's ability to bind microtubules and promote assembly. Different mutations differentially alter distinct biochemical properties and stoichiometry of tau isoforms. In sarkosyl-insoluble fractions from patient brains, specific mutations produce distinct isoform compositions. |
Recombinant tau functional assays (microtubule binding and assembly); biochemical analysis of sarkosyl-insoluble tau from patient brains |
Science |
High |
9836646
|
| 2000 |
FTDP-17 mutations produce either reduced ability of tau to interact with microtubules, or overproduction of four-repeat tau isoforms; several missense mutations also stimulate heparin-induced tau filament formation in vitro, suggesting that assembly of tau into filaments represents a gain of toxic function. |
In vitro microtubule binding assays; heparin-induced tau filament assembly assays with recombinant mutant tau |
Biochimica et biophysica acta |
High |
10899436
|
| 2001 |
GSK-3β controls tau phosphorylation and tau's functional interaction with microtubules. In transfected cells and cultured neurons, GSK-3β activity governs tau phosphorylation state; in NFT-bearing neurons, acetylated α-tubulin immunoreactivity (marker of stable microtubules) is strongly reduced, consistent with microtubule destabilization caused by phosphorylated tau. |
Transfected cell assays; cultured neuron experiments; immunohistochemistry; in situ hybridization |
Biochemical Society symposium |
Medium |
11447842
|
| 2002 |
Specific tau phosphorylation sites correlate with sequential stages of neurofibrillary tangle development in AD: TG3 (pT231), pS262, and pT153 mark the pre-tangle state; pT175/181, 12E8 (pS262/S356), pS422, pS46, pS214 mark intraneuronal NFTs; AT8 (pS199/S202/T205), AT100 (pT212/S214), and PHF-1 (pS396/S404) are most prominent in extracellular NFTs, defining a temporal sequence of phosphorylation events during neuronal cytopathology. |
Systematic immunostaining with 11 phosphorylation-dependent tau antibodies on a panel of AD cases; correlation with tangle stage |
Acta neuropathologica |
High |
11837744
|
| 2005 |
Transglutaminase cross-links phosphorylated tau in vivo. In P301L tau transgenic mice that develop NFTs, transglutaminase cross-links phosphorylated tau into high-molecular-mass aggregates, with transglutaminase enzymatic activity significantly elevated in the spinal cord; this cross-linking co-localizes with PHF-1-immunoreactive tau in neurons. |
Immunoprecipitation, immunoblotting, double-label immunofluorescence, enzymatic activity assay in transgenic mouse brain |
The Journal of neuroscience |
Medium |
15689560
|
| 2006 |
FTDP-17 mutations G272V, ΔK280, and P301L markedly reduce the ability of tau to regulate microtubule dynamic instability in living cells, while R406W (outside the microtubule-binding domain) does not significantly alter microtubule regulation, supporting a loss-of-function model for these mutations. |
Microinjection of recombinant wild-type and mutant tau into cells expressing fluorescent tubulin; direct measurement of individual microtubule dynamic instability parameters |
The Journal of biological chemistry |
High |
16495230
|
| 2007 |
In P301S tau transgenic mice, hippocampal synapse loss and impaired synaptic function precede fibrillary tau tangle formation (detected at 3 months before 6-month tangle onset), and prominent microglial activation also precedes tangles. Immunosuppression with FK506 attenuated tau pathology and increased lifespan, linking neuroinflammation to early tauopathy progression. |
Transgenic mouse model analysis; electrophysiology; immunohistochemistry; FK506 pharmacological intervention |
Neuron |
High |
17270732
|
| 2005 |
Tau suppression in mice expressing a repressible P301L human tau restored memory function and stabilized neuron numbers after NFT formation, demonstrating that NFTs per se are not sufficient to cause cognitive decline or neuronal death, and that ongoing tau expression (not NFTs) drives these deficits. |
Tet-off repressible transgenic mouse model; behavioral testing; immunohistochemistry; neuron counting |
Science |
High |
16020737
|
| 2009 |
FTDP-17 missense mutations G272V, P301L, V337M, and R406W promote phosphorylation of tau at Ser202 by Cdk5 in vitro, and this Ser202 phosphorylation inhibits tau's microtubule assembly-promoting activity more severely in mutant tau than in wild-type tau. |
In vitro Cdk5 phosphorylation of recombinant mutant tau; microtubule assembly assay; SDS-PAGE mobility shift analysis |
The Journal of biological chemistry |
High |
19304664
|
| 2010 |
Tau has a dendritic function: it targets the Src kinase Fyn to postsynaptic compartments, where Fyn phosphorylates NR2B subunit of NMDA receptors and promotes interaction with PSD-95. Missorting of tau (by truncation) or tau deficiency disrupts postsynaptic Fyn targeting, uncouples NMDA receptor-mediated excitotoxicity, and mitigates Aβ toxicity in APP23 mice. A peptide uncoupling Fyn-NR2B-PSD-95 interaction fully rescues memory deficits. |
Transgenic mouse models (truncated tau, tau knockout, APP23 crosses); behavioral testing; biochemical fractionation; peptide rescue experiments |
Cell |
High |
20655099
|
| 2011 |
When tau expression exceeds an intracellular threshold in non-neuronal cells, tau is released to the extracellular medium in association with membrane vesicles (exosomes), suggesting a cellular mechanism to eliminate excess tau protein. |
Tau overexpression in non-neuronal cells; biochemical fractionation; detection of tau in conditioned medium associated with membrane vesicles |
FEBS letters |
Medium |
22138183
|
| 2012 |
Aggregated (but not monomeric) tau inhibits anterograde fast axonal transport (FAT) in squid axoplasm. This inhibition requires a small N-terminal phosphatase-activation domain (PAD). Hsp70 preferentially binds tau oligomers over filaments and prevents the FAT inhibition caused by aggregated tau mixtures. |
Squid axoplasm perfusion assay; antibody labeling with PAD-specific (TNT1) and oligomer-specific (TOC1) antibodies; Hsp70 rescue experiment |
Biochemical Society transactions |
Medium |
22817713
|
| 2014 |
Tau acetylation by p300 histone acetyltransferase (HAT) disfavors liquid-liquid phase separation (LLPS), inhibits heparin-induced aggregation, and impedes LLPS-initiated microtubule assembly, suggesting that hyperacetylation contributes to tau loss-of-function by preventing LLPS-mediated microtubule assembly. |
In vitro hyperacetylation of tau by p300 HAT; ThT aggregation assay; phase separation assay; microtubule assembly assay |
International journal of molecular sciences |
Medium |
29734651
|
| 2014 |
HDAC6 functions as a tau deacetylase; inhibition of HDAC6 has neuroprotective effects including microtubule stabilization in tau-based pathologies. |
Review of experimental evidence for HDAC6 as tau deacetylase; pharmacological HDAC6 inhibition studies in tau models |
Alzheimer's research & therapy |
Medium |
25031639
|
| 2014 |
Tau strains stably propagate distinct amyloid conformations in a clonal fashion in cultured cells; reintroduction of tau from these lines into naive cells reestablishes identical clones. Two strains produced in vitro induce distinct pathologies in vivo across three generations of transgenic mice, demonstrating that tau conformation encodes strain identity analogous to prions. |
Stable tau repeat domain expression in HEK293 cells; clonal propagation assays; inoculation of tau strains into transgenic mice; immunopurification and strain reestablishment in culture |
Neuron |
High |
24857020
|
| 2016 |
Neuronal activity stimulates tau release from cells in vitro and enhances tau pathology in vivo. Using optogenetic and chemogenetic approaches to increase neuronal activity, both tau secretion and tau pathology (seeding/propagation) were enhanced, demonstrating activity-dependent regulation of tau release. |
Optogenetic and chemogenetic manipulation of neuronal activity; in vitro tau secretion assay; in vivo tau pathology quantification in transgenic mice |
Nature neuroscience |
High |
27322420
|
| 2017 |
Cryo-EM structures of tau filaments from Alzheimer's disease brain at 3.4–3.5 Å resolution show that filament cores are made of two identical protofilaments comprising residues 306–378 of tau, adopting a combined cross-β/β-helix structure. Paired helical and straight filaments differ only in inter-protofilament packing, making them ultrastructural polymorphs. This defines the seed structure for tau aggregation. |
Cryo-electron microscopy of patient-derived tau filaments; atomic model building |
Nature |
High |
28678775
|
| 2017 |
Rab7A regulates tau secretion: deletion of Rab7A decreases tau secretion, while a constitutively active Rab7A increases it. A dominant-negative Rab7A also decreases secretion, and tau co-localizes with Rab7-positive late endosomal structures, indicating a late endosomal compartment is involved in tau secretion. |
Rab7A knockout, dominant-negative and constitutively active expression in primary cortical neurons and HeLa cells overexpressing tau; tau secretion assays; co-localization imaging |
Journal of neurochemistry |
Medium |
28222213
|
| 2017 |
FTDP-17 tau mutations act to enhance phosphorylation of tau in vivo in Drosophila, and phosphorylation-dependent excess stabilization of the actin cytoskeleton is a key downstream mediator of tau neurotoxicity. Autophagy and the unfolded protein response are co-regulated with this cytoskeletal stabilization. |
Site-directed insertion transgenic Drosophila expressing wild-type and five FTDP-17 mutant human tau isoforms; neurodegeneration markers; actin cytoskeleton analysis; autophagy and UPR pathway analysis |
The Journal of neuroscience |
Medium |
29138281
|
| 2018 |
Tau directly interacts with BIN1 through BIN1's SH3 domain and the tau proline-rich motif P216PTPR221. NMR-based structural modeling revealed key contacts (P216, P219 with BIN1 aromatic residues; R221, K224 with BIN1 acidic residues). Phosphorylation of tau at T212, T217, T231, and S235 reduces BIN1 SH3 affinity 5-fold and prevents tau from competing with the BIN1 intramolecular SH3-CLAP interaction. |
Nuclear magnetic resonance spectroscopy; structural modeling; affinity measurements (Kd); competitive binding assays with phosphorylated vs. unphosphorylated tau peptides |
Frontiers in molecular neuroscience |
High |
30487734
|
| 2019 |
BAG3 (co-chaperone) cooperates with SYNPO (synaptopodin) to facilitate autophagic clearance of phospho-MAPT (pSer262) in neuronal processes. Loss of either BAG3 or SYNPO impedes autophagosome-lysosome fusion predominantly in the post-synaptic compartment, causing accumulation of SQSTM1/p62 and pSer262-tau in autophagosomes at post-synaptic densities. |
shRNA knockdown of BAG3 and SYNPO in mature neurons (20-24 DIV); immunofluorescence; autophagy flux assays; co-localization with autophagy markers |
Autophagy |
Medium |
30744518
|
| 2019 |
Cofilin competes with tau for direct microtubule binding in vitro, in cells, and in vivo, inhibiting tau-induced microtubule assembly. Genetic reduction of cofilin mitigates tauopathy and synaptic defects in Tau-P301S mice and movement deficits in tau transgenic C. elegans. Only activated (dephosphorylated) cofilin selectively interacts with tubulin, destabilizes microtubules, and promotes tauopathy. |
In vitro microtubule co-sedimentation; cell-based microtubule assays; genetic cofilin reduction in P301S mice; tau transgenic C. elegans behavioral assays |
Communications biology |
High |
30911686
|
| 2019 |
LRRK2 acts as a scaffold facilitating tau phosphorylation rather than as a direct tau kinase: LRRK2 binds tau 140–200-fold more strongly than cdk5 but phosphorylates tau with 250–480-fold lower specific activity than cdk5. cdk5 and tau co-immunoprecipitate with endogenous LRRK2 in cells and mouse brain. LRRK2 knockdown reduces tau phosphorylation at Ser396/404, while LRRK2 kinase inhibition has no effect on these sites. |
In vitro kinase assays with LRRK2 and cdk5; co-immunoprecipitation from SH-SY5Y cells, mouse brain, and human PBMCs; siRNA knockdown; pharmacological kinase inhibition; overexpression of kinase-dead mutant |
Biochemistry |
Medium |
26268594
|
| 2019 |
TTBK1 (Tau-tubulin kinase 1) directly phosphorylates tau at Ser422 and activates CDK5, a major tau kinase, promoting tau accumulation and aggregation. TTBK1 is specifically expressed in the CNS, and its transgenic overexpression accelerates tau accumulation and neuroinflammation in tau mutant mice. |
In vitro kinase assay; CDK5 activation assay; TTBK1 transgenic mice crossed with P301L tau mice; immunohistochemistry |
Frontiers in molecular neuroscience |
Medium |
24808823
|
| 2020 |
β-Arrestin2 oligomers stabilize pathogenic tau and promote tau aggregation via non-GPCR mechanisms. Oligomerized (but not monomeric) β-arrestin2 inhibits self-interaction of the autophagy cargo receptor p62/SQSTM1, thereby impeding autophagy flux and tau clearance. Genetic ablation of β-arrestin2 markedly reduces tau pathology and rescues synaptic plasticity in P301S tau mice. |
Atomic force microscopy; defined mutant β-arrestin2 constructs; KO and overexpression in cells and primary neurons; P301S × β-arrestin2−/− cross; AAV-encoded dominant-negative in vivo |
Proceedings of the National Academy of Sciences of the United States of America |
High |
32071246
|
| 2020 |
LRP1 is an endocytic receptor for tau: it binds monomeric tau and the tau microtubule-binding domain with high affinity (surface plasmon resonance), rapidly internalizes tau, and delivers it to lysosomes for degradation. Phosphorylated tau binds LRP1 weakly and is less efficiently internalized. ApoE (especially apoE4) inhibits LRP1-mediated tau uptake. LRP1-expressing (but not LRP1-deficient) cells promote cytosolic tau seeding from pathological brain-derived tau. |
Surface plasmon resonance; 125I-labeled tau internalization assay; lysosomal degradation assay; cell lines with/without LRP1; tau seeding assay with AD brain lysates |
The Journal of biological chemistry |
High |
33930462
|
| 2020 |
Retromer (specifically the VPS35 component) regulates autophagy-lysosomal clearance of MAPT aggregates. VPS35 depletion blocks autophagy resolution and causes marked accumulation of cytoplasmic MAPT aggregates; VPS35 overexpression has the opposite effect. |
Chemical and genetic autophagy blockade; VPS35 knockdown and overexpression in cell models of tau aggregation; biochemical aggregation assays |
Autophagy |
Medium |
32960680
|
| 2020 |
AQP4 (aquaporin-4)-driven glymphatic clearance facilitates elimination of extracellular tau from brain interstitial fluid to CSF and cervical lymph nodes. AQP4 deletion elevates CSF tau and markedly exacerbates phosphorylated tau deposition and neurodegeneration in P301S tau transgenic mice. |
AQP4 knockout mice crossed with P301S tau transgenic mice; tau measurement in CSF and lymph nodes; phospho-tau immunohistochemistry; neurodegeneration scoring |
The Journal of experimental medicine |
High |
35212707
|
| 2021 |
TIA1 (RNA-binding protein) interaction with tau and RNA is sufficient to drive tau phase separation at physiological concentrations without artificial crowding agents. Phase separation of tau with TIA1 generates tau oligomers that are significantly more toxic than tau aggregates generated by RNA alone or artificial crowding, identifying a new source of toxic oligomers. |
In vitro phase separation assay with recombinant tau, RNA, and TIA1; oligomer characterization; cell toxicity assays; comparison with G3BP1 and crowding agent conditions |
Proceedings of the National Academy of Sciences of the United States of America |
High |
33619090
|
| 2021 |
Tau forms small oligomeric complexes on microtubules in cells under physiological conditions, distinct from pathological tau aggregates. Single-molecule localization microscopy showed that distinct tau phosphorylation states are associated with different tau aggregate morphologies. |
Single-molecule localization microscopy (STORM/SMLM); unsupervised shape classification algorithm; ex vivo neuronal preparations |
Proceedings of the National Academy of Sciences of the United States of America |
Medium |
33952699
|
| 2021 |
CHIP/STUB1 (E3 ubiquitin ligase) selectively binds phosphorylated tau ~10-fold more strongly than unmodified tau via its TPR domain. Sub-stoichiometric CHIP strongly suppresses aggregation and seeding of phosphorylated tau, promotes rapid ubiquitination of phosphorylated (but not unmodified) tau in vitro, and restricts tau seeding in cells. |
Binding screen of TPR-domain chaperones; in vitro ubiquitination assay; aggregation and seeding assays; cell-based seeding assay |
Journal of molecular biology |
High |
37330289
|
| 2021 |
PIKfyve activity is required for lysosomal trafficking of tau seeds and subsequent tau seeding in neurons. Dynamin-1, actin, and Rac1 are key players in tau seed endocytosis. PIKfyve inhibition (pharmacological and genetic), downstream of Rac1, reduces tau seed trafficking to lysosomes and inhibits induction of tau aggregation. |
Pharmacological inhibition and genetic tools (siRNA); endocytic pathway analysis; tau seeding assay in neurons |
The Journal of biological chemistry |
Medium |
33831417
|
| 2021 |
Tau acetylmimetics at K321 and K353 (within KXGS motifs) strongly inhibit prion-like seeded aggregation of pathogenic P301L tau and impair intrinsic aggregation of P301L/S320F tau, altering tau conformation to extensively block Thioflavin S binding. All KXGS acetylmimetics reduce tau-microtubule interactions. |
HEK293T transfection of acetylmimetic (K→Q) tau mutants; microtubule binding assay; prion-like seeded aggregation assay; Thioflavin S binding |
Scientific reports |
Medium |
34426645
|
| 2024 |
Tau fibrils induce nanoscale lysosomal membrane damage upon endocytosis in primary astrocytes and neurons, recruiting ESCRT proteins (but not Galectin-3), indicating nanoscale rather than wholesale membrane rupture. Nucleation of cytosolic tau occurs primarily at the lysosomal membrane, coupling lysosomal escape to initiation of tau seeding. |
Live cell imaging; STORM superresolution microscopy; ESCRT and Galectin-3 recruitment assays; lysosomal swelling and deacidification measurements in primary astrocytes and neurons |
Proceedings of the National Academy of Sciences of the United States of America |
High |
38781206
|
| 2024 |
Tau undergoes liquid-liquid phase separation (LLPS) with DNA, mononucleosomes, and reconstituted nucleosome arrays under low salt conditions. Low concentrations of tau promote chromatin compaction and protect DNA from digestion; tau co-localizes into droplets with nucleosome arrays and phosphorylated HP1α. Aberrant hyperphosphorylation disrupts tau LLPS with chromatin, suggesting loss of nuclear chromatin regulatory function in tauopathy. |
In vitro biophysical LLPS assays with recombinant tau, DNA, and reconstituted nucleosomes; DNase protection assay; co-phase separation with HP1α; hyperphosphorylated tau comparison |
Communications biology |
Medium |
38429335
|
| 2019 |
A small amount of tau localizes in the nuclear compartment (in both soluble and chromatin-bound fractions). Favoring tau nuclear translocation by overexpression or detachment from microtubules increases VGluT1 (vesicular glutamate transporter 1) gene expression. The P301L FTDP-17 mutation impairs this nuclear function, representing a loss-of-function mechanism distinct from aggregation. |
Subcellular fractionation; live imaging; tau overexpression and microtubule detachment; VGluT1 expression quantification; P301L mutant comparison |
Journal of molecular biology |
Medium |
30664870
|