The DOI matches its Crossref record; 78 of the 78 references it cites were found in a registry or an index; none of the 34 sources its claims cite is checked for support yet.
Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease
Open accessAbstract
SUMMARY To elucidate the role of Tau isoforms and post-translational modification (PTM) stoichiometry in Alzheimer’s disease (AD), we generated a high-resolution quantitative proteomics map of 95 PTMs on multiple isoforms of Tau isolated from postmortem human tissue from 49 AD and 42 control subjects. Although Tau PTM maps reveal heterogeneity across subjects, a subset of PTMs display high occupancy and frequency for AD, suggesting importance in disease. Unsupervised analyses indicate that PTMs occur in an ordered manner, leading to Tau aggregation. The processive addition and minimal set of PTMs associated with seeding activity was further defined by analysis of size-fractionated Tau. To summarize, features in the Tau protein critical for disease intervention at different stages of disease are identified, including enrichment of 0N and 4R isoforms, underrepresentation of the C terminus, an increase in negative charge in the proline-rich region (PRR), and a decrease in positive charge in the microtubule binding domain (MBD).
Overview
AI snapshot
Written from the paper’s full text.
TL;DR
This study used quantitative mass spectrometry to map tau post-translational modifications in postmortem brain from Alzheimer’s disease and control donors, finding heterogeneous but ordered modification patterns that track disease stage. It identifies isoform shifts and charge-related modifications linked to aggregation and seeding.
Key findings
Across 49 AD and 42 control subjects, 95 PTMs at 88 residues were mapped, including 55 phosphorylation, 17 ubiquitination, 19 acetylation, and 4 methylation sites; insoluble tau was about 100-fold higher in AD (~1,000 vs ~10 fmol/mg), while soluble tau was lower (~3,000 vs ~5,000 fmol/mg). Insoluble AD tau was enriched for 0N and 4R isoforms; N-terminal and C-terminal regions were underrepresented, proline-rich region phosphorylation was high, and microtubule-binding-domain acetylation/ubiquitination increased with aggregate size. Unsupervised clustering separated subjects into groups reflecting Braak stage and PTM burden, and a classifier trained on cohort 1 predicted AD pathology in cohort 2 with >0.92 accuracy. Size-fractionated tau showed seeding-competent high-molecular-weight/insoluble species had microtubule-binding-domain modifications and 20 phosphosites in the high-molecular-weight fraction, while seeding-incompetent low-molecular-weight/soluble species were N-terminally enriched and had fewer proline-rich-region phosphosites.
Methods
Postmortem BA39 angular gyrus from 49 AD and 42 matched controls was analyzed, plus BA46 frontal gyrus in 9 controls and 10 AD subjects; high- and low-molecular-weight tau fractions came from 4 AD and 4 control subjects. FLEXITau targeted mass spectrometry quantified absolute tau and isoform-specific peptides, while data-dependent LC-MS/MS mapped PTMs; sarkosyl solubility and size-exclusion/MC1 fractionation separated tau species. Analyses included PCA, hierarchical clustering, PLS-DA, Spearman correlation, and a stochastic gradient descent classifier; data were deposited in ProteomeXchange.
Limitations
Stated: using top-ranked PTMs as biomarkers requires an adequately powered study with suitable specimens, and high-molecular-weight fraction PTM patterns showed patient-to-patient variability. Stated/evident: the postmortem cross-sectional design cannot directly prove temporal order or causality of PTM progression, and some controls had early AD-like PTMs, complicating group boundaries. Evident: some analyses rely on small subsets (BA46 n=19; high-/low-molecular-weight n=8), and stoichiometry for some microtubule-binding-domain sites was around 50%, so not every tau molecule carries those modifications.
Model-written summary. Check it against the paper before relying on it.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
0 of 34 cited sources checked · 0 supported · 0 flagged
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Our analysis extended this to 55 phosphorylation sites on pathological insoluble Tau in BA39 and 43 phosphosites in B46 (Figure S2C).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Qualitative and Quantitative Maps of Tau PTMs and Their Frequency in AD Patient
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The median concentrations of pathological insoluble Tau in BA39 were 100-fold higher in AD (~1,000 fmol/mg fresh weight of tissue) compared with controls (~10 fmol/mg fresh weight of tissue) (Figure 1B).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Tau Concentrations and Isoform Distributions in AD and Control Subjects
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Interestingly, in soluble Tau, the most abundant species are the 1N and 4R isoforms”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Tau Concentrations and Isoform Distributions in AD and Control Subjects
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“underrepresentation of the C terminus”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > Abstract
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The data and subsequent analyses showed that that the highest-frequency PTMs, isoform distributions, and quantitative profiles of the BA46 region are shared between the two brain regions”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS
Strength:plain· not yet calibratedn = 10Tests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“subjects in these clusters have a significantly higher Tau and amyloid burden in BA39 than subjects falling into clusters a and d (Figure 2B).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Individual Tau PTM Profiles Show Heterogeneity and Reflect Disease Progression
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Increased phosphorylation of the PRR is also observed in symptomatic patients in cluster d as well as in AD clusters b and c”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Individual Tau PTM Profiles Show Heterogeneity and Reflect Disease Progression
Strength:plain· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Although Tau PTM maps reveal heterogeneity across subjects”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > Abstract
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The total amount of soluble Tau is lower in AD patients (~3,000 fmol/mg fresh weight of tissue) compared with control subjects (~5,000 fmol/mg fresh weight of tissue) (Figure 1B).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Tau Concentrations and Isoform Distributions in AD and Control Subjects
Strength:plain· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In particular, the peptides spanning [195–209] and [212–224] that encompass the sites (S198, S199, S202, T205) and (S212, S214, S217) respectively, are observed to be > 90% modified in AD in the FLEXITau data.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Qualitative and Quantitative Maps of Tau PTMs and Their Frequency in AD Patient
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
- It may state two separate claims as one. 41
- Probably not a substantial claim. 27
- The quote only partly states this claim. 1
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Cluster d contains 10 symptomatic patients with late stage AD pathology Braak IV-VI and 16 asymptomatic controls at Braak 0–II.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Individual Tau PTM Profiles Show Heterogeneity and Reflect Disease Progression
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“ANOVA analysis showed higher Tau and Ab levels in clusters with a higher Braak stage and increased level of Tau PTMs (Figure 2B).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Individual Tau PTM Profiles Show Heterogeneity and Reflect Disease Progression
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“We identified 95 distinct PTMs on 88 amino acid residues across all samples and fractions, with a cumulative sequence coverage of 96% from detected modified and unmodified 2N4R Tau peptides (Figure 1E).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Qualitative and Quantitative Maps of Tau PTMs and Their Frequency in AD Patient
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Some of the 88 sites of modification mapped are modified by a single type of PTM; however, others can carry multiple types of modifications, such as K311, which can be ubiquitinated or acetylated.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Qualitative and Quantitative Maps of Tau PTMs and Their Frequency in AD Patient
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In this study, we show that 17 ubiquitin sites are specific to pathological Tau (14 in BA46; Figure S2C).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Qualitative and Quantitative Maps of Tau PTMs and Their Frequency in AD Patient
Strength:boosted· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“A large percentage of AD patients cluster into two major groups (Figure 2A, b and c), whereas the controls fall into two clusters (Figure 2A, a and d).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Individual Tau PTM Profiles Show Heterogeneity and Reflect Disease Progression
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Instead, the 1N isoform is depleted significantly, and the 0N isoform is enriched in the insoluble fraction.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Tau Concentrations and Isoform Distributions in AD and Control Subjects
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“FLEXITau quantified a total of 24 Tau peptides; of these, some were isoform specific, achieving a total sequence coverage of 61% for the 2N4R Tau isoform (Figure 1D).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Tau Concentrations and Isoform Distributions in AD and Control Subjects
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“A high frequency of acetylation occurs in the R4 region, including the sites K353, K369, K370, and K375, whereas ubiquitination occurs in R1–R3.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Qualitative and Quantitative Maps of Tau PTMs and Their Frequency in AD Patient
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“in the insoluble fraction containing pathologic Tau, 0N and 1N Tau were enriched significantly compared with the 2N isoform, and the 4R isoform is enriched significantly compared with the 3R isoform.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Tau Concentrations and Isoform Distributions in AD and Control Subjects
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The Braak stage of cluster b is V, whereas the Braak stage of cluster c is VI”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Individual Tau PTM Profiles Show Heterogeneity and Reflect Disease Progression
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Nineteen distinct acetylation sites were mapped in BA39 and 18 in BA46.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Qualitative and Quantitative Maps of Tau PTMs and Their Frequency in AD Patient
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Clusters b and c display many of the same PTMs; however, in cluster c, we observe a higher frequency of several PTMs, including T175, S237, and K281 (and S113, S191, and T205, which are difficult to observe at lower stoichiometry, particularly because S113 is a phosphosite found on a 0N Tau peptide).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Individual Tau PTM Profiles Show Heterogeneity and Reflect Disease Progression
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“These PTMs include phosphorylation occurring at adjacent sites (S262 and S263), acetylation (K311, K353, and K369), and ubiquitination (K259, K267, K311, and K317).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Individual Tau PTM Profiles Show Heterogeneity and Reflect Disease Progression
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“These data indicate that there is an increase in the number of PTMs and the occupancy of these PTM sites observed at different stages of disease”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Stoichiometric PTM Maps of Human Pathologic Tau Identify Critical Steps in Disease Progression
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Our analysis of pathological Tau from 91 subjects (49 AD and 42 control subjects) cumulatively identifies 95 PTMs at 88 aa residues. We mapped 55 phosphosites, 17 ubiquitination sites, 19 acetylation sites, and four methylation sites along the length of the Tau protein.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > DISCUSSION
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The seeding-incompetent AD and control Tau sarkosyl-soluble fractions show no differences; both are enriched in the N-terminal regions (Figure 4C).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Identifying PTMs Associated with Seeding Activity in Size-Fractionated Tau
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Although the unmodified C-terminal peptide is found with low abundance in AD compared to all controls, there is a control cluster where the C terminus is completely unmodified (Figure 3A) and the other control cluster shows some processing.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Tau Peptide Stoichiometry Data Identify Key Pathological Features in Disease
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Unsupervised analyses based on the presence or absence of PTMs clustered the subjects into 4 major groups and revealed that there were specific combinations of PTMs in each of these groups.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > DISCUSSION
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“the PRR appears to accumulate phosphosites and the MBD appears to accumulate acetylation and ubiquitination with increasing size of Tau aggregates.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Identifying PTMs Associated with Seeding Activity in Size-Fractionated Tau
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“HMW Tau, which is thought to be oligomeric Tau, displays 20 phosphosites (6 in the N terminus, 10 in the PRR, and 4 in the C-terminal region) as well as 3 acetylation and 4 ubiquitin sites in the MBD.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Identifying PTMs Associated with Seeding Activity in Size-Fractionated Tau
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“LMW Tau shows a similar modification pattern to Tau as the sarkosyl-soluble fraction, with 6 phosphorylations (T181, S199, S202, and T231) in the PRR being consistently observed sites in LMW and sarkosyl-soluble fractions.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Identifying PTMs Associated with Seeding Activity in Size-Fractionated Tau
Strength:plain· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The N-specific region is largely underrepresented (45–67, 68–87, and 88–126), as is the C terminus in AD.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Tau Peptide Stoichiometry Data Identify Key Pathological Features in Disease
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Comparative analysis of the two seeding-competent fractions, HMW Tau and the larger, fibrillized, insoluble Tau, shows a similar pattern; however, the MBD is even more enriched in the insoluble Tau fraction, and the peptide 260–267 is underrepresented, indicating a higher phosphorylation stoichiometry of this peptide (S262 and T263).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Identifying PTMs Associated with Seeding Activity in Size-Fractionated Tau
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“These sites include three KXGS motifs”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > DISCUSSION
Strength:plain· not yet calibratedn = 91Tests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Although acetylation and ubiquitination are observed in the MBD of HMW Tau”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > DISCUSSION
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The patient frequency of these PTMs is high; however, the stoichiometry of these sites is ~50%; thus, every second Tau molecule in a fibril is modified.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > DISCUSSION
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Moreover, the increase in these modifications correlates positively with increasing polymer length and increased abundance of pathological Tau associated with disease progression.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > DISCUSSION
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
In the paper
“we previously developed a targeted, high-throughput quantitative mass spectrometry (MS) method called FLEXITau (full-length expressed stable isotope-labeled Tau) (Mair et al., 2016), which provides absolute quantification and unbiased stoichiometric information of Tau PTMs from the N to the C terminus.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > INTRODUCTION
What the sources say
- Not checked yetcites Mair et al., 2016
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“Tau forms intracellular neurofibrillary tangles (NFTs) (Grundke-Iqbal et al., 1986; Kosik et al., 1986; Wood et al., 1986)”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > INTRODUCTION
What the sources say
- Not checked yetcites Grundke-Iqbal et al., 1986
- Not checked yetcites Kosik et al., 1986
- Not checked yetcites Wood et al., 1986
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
None of the sources cited for this claim have been checked yet.
In the paper
“Tens of possible PTM sites have been described for Tau in studies involving in vitro (Hanger et al., 2007; Martin et al., 2013a, 2013b) and in vivo AD mouse models (Morris et al., 2015; Tramutola et al., 2018) and in postmortem human studies (Hanger et al., 2007; Min et al., 2015).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > INTRODUCTION
What the sources say
- Not checked yetcites Hanger et al., 2007
- Not checked yetcites Martin et al., 2013a
- Not checked yetcites Morris et al., 2015 source
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“Besides phosphorylation, the neurofibrillary aggregates are also subject to a wide range of other PTMs (Hanger et al., 2007)”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > INTRODUCTION
What the sources say
- Not checked yetcites Hanger et al., 2007
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
None of the sources cited for this claim have been checked yet.
In the paper
“Aβ forms extracellular plaques (Glenner and Wong, 1984; Masters et al., 1985)”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > INTRODUCTION
What the sources say
- Not checked yetcites Glenner and Wong, 1984
- Not checked yetcites Masters et al., 1985
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“pathological neurofibrillary Tau aggregates show a pattern of accumulation that starts in the entorhinal cortex and spreads through connected pathways to cortical areas (Jucker and Walker, 2013)”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > INTRODUCTION
What the sources say
- Not checked yetcites Jucker and Walker, 2013 source
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The majority of subjects in d are listed as control subjects, and these PTMs are likely to be the earliest signs of pathology.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Individual Tau PTM Profiles Show Heterogeneity and Reflect Disease Progression
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
The paper states this without a source or data behind it here, so there is nothing to check it against. The quote shows it is in the paper.
In the paper
“they cannot accurately measure quantitative changes or determine PTM stoichiometry.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > INTRODUCTION
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
None of the sources cited for this claim have been checked yet.
In the paper
“The discovery of dominantly inherited Tau mutations leading to frontotemporal dementia (FTD) (Poorkaj et al., 1998; Spillantini et al., 1998)”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > INTRODUCTION
What the sources say
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“suggesting that early disease is observed in a few controls.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Qualitative and Quantitative Maps of Tau PTMs and Their Frequency in AD Patient
Strength:hedged· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesThe quote only partly states this claim.
None of the sources cited for this claim have been checked yet.
In the paper
“brain lysates seed Tau aggregation when high-molecular-weight oligomeric hyperphosphorylated (AT8 and AT100) Tau species are present (Takeda et al., 2015; Jackson et al., 2016)”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > INTRODUCTION
What the sources say
- Not checked yetcites Takeda et al., 2015 source
- Not checked yetcites Jackson et al., 2016
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
None of the sources cited for this claim have been checked yet.
In the paper
“Combinations of such PTMs are responsible for regulating and fine-tuning protein conformation and activity (Aebersold et al., 2018; Soria et al., 2014)”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > INTRODUCTION
What the sources say
- Not checked yetcites Aebersold et al., 2018 source
- Not checked yetcites Soria et al., 2014
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
In the paper
“This encompasses a cycle that involves production of a Tau seed followed by uptake of seed-competent Tau into connected cells (Clavaguera et al., 2013)”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > INTRODUCTION
What the sources say
- Not checked yetcites Clavaguera et al., 2013
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“This suggests that the modification at the C terminus is an early event during aging and AD pathology and can most likely be attributed to caspase-3 and −6 cleavage at D418 and D421.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Tau Peptide Stoichiometry Data Identify Key Pathological Features in Disease
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
In the paper
“which has been shown to form the core region of the Tau filaments (Fitzpatrick et al., 2017).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > DISCUSSION
What the sources say
- Not checked yetcites Fitzpatrick et al., 2017
Strength:boosted· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
None of the sources cited for this claim have been checked yet.
In the paper
“which are known to regulate neurite extension and binding of Tau to microtubules (Biernat et al., 1993; Biernat and Mandelkow, 1999).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > DISCUSSION
What the sources say
- Not checked yetcites Biernat et al., 1993
- Not checked yetcites Biernat and Mandelkow, 1999
Strength:boosted· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Importantly, these data suggest that early intervention may need different therapeutic agents than late-stage AD because there are distinct differences in PTM profiles associated with each stage of disease.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > DISCUSSION
Tests✓ Asserted: passes? Checkable: unclear✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“This increase in phosphorylation of Tau may be involved in neutralizing the charge in the MBD domain to promote aggregation”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Tau Peptide Stoichiometry Data Identify Key Pathological Features in Disease
Strength:hedged· not yet calibratedCausal:conditional· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The sets of PTMs were largely reflective of disease progression and therefore could be associated with disease stages.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > DISCUSSION
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The above results from sarkosyl-insoluble (fibrillized) Tau from AD and control subjects indicate that there is processivity and an order in which PTMs occur in the fibrillization process.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > RESULTS > Identifying PTMs Associated with Seeding Activity in Size-Fractionated Tau
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
In the paper
“an observation partially consistent with recent Tau PTM mapping results in mice (Morris et al., 2015; Table S5).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > DISCUSSION
What the sources say
- Not checked yetcites Morris et al., 2015 source
Tests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“To ensure no bias in acquisition, samples were run in randomized order (three technical replicates per sample).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > METHOD DETAILS > Preparation of brain tissue samples and mass spectrometry analysis
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“In addition, all MS/MS spectra of identified post-translationally modified peptides were subjected to manual verification.”
- Also stated in: § Preparation and MS analysis of MC1-isolated Tau · plain
“Spectra for identified modified peptides were manually validated.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > METHOD DETAILS > Preparation of high and low molecular weight Tau and mass spectrometric analysis
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
- Also stated in: § Preparation and MS analysis of MC1-isolated Tau · plain
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“These data suggest that the 0N and 4R version, when phosphorylated, is no longer disordered and can adopt a structure capable of fibril formation.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > DISCUSSION
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“In addition, all MS/MS spectra of identified post-translationally modified peptides were subjected to manual verification.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > METHOD DETAILS > Preparation of brain tissue samples and mass spectrometry analysis
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“All peptide transitions were evaluated for variability, similarity between y-ion ratios, elution times, and interfering signals by manual analysis.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > METHOD DETAILS > Preparation of brain tissue samples and mass spectrometry analysis
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“Peptides were considered ‘quantifiable’ if the peptide transitions had a signal-to-noise of > 3 and at least three light and three heavy high-quality SRM transitions were observed.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > METHOD DETAILS > Preparation of brain tissue samples and mass spectrometry analysis
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“which would be charged positively at physiological pH and experience repulsive electrostatic forces, preventing formation of a b sheet fibril structure.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > DISCUSSION
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
- Rests on an assumption: Tau contains 19 lysine residues in its microtubule-binding domain.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Increased phosphorylation in the PRR results in accumulation of negative charges, which, we postulate, could neutralize the positive charge in the MBD”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > DISCUSSION
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“False discovery rate (FDR) was set to 1% on peptide and protein levels with a minimum length of seven amino acids and was determined by searching a reverse database.”
- Also stated in: § Preparation and MS analysis of MC1-isolated Tau · plain
“False discovery rate (FDR) was set to 1% on peptide and protein level and was determined by searching a reverse database.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > METHOD DETAILS > Preparation of brain tissue samples and mass spectrometry analysis
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim. It may state two separate claims as one.
- Also stated in: § Preparation and MS analysis of MC1-isolated Tau · plain
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“Randomized samples (SEC fractions 2,3,4 and 14,16,18 for 4 AD and 4 control human brain samples) were analyzed in duplicates using a Q Exactive mass spectrometer”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > METHOD DETAILS > Preparation of high and low molecular weight Tau and mass spectrometric analysis
Strength:plain· not yet calibratedn = 4Tests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“Randomized samples (SEC fractions 2,3,4 and 14,16,18 for 4 AD and 4 control human brain samples) were analyzed in duplicates using a Q Exactive mass spectrometer”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > METHOD DETAILS > Preparation of high and low molecular weight Tau and mass spectrometric analysis
Strength:plain· not yet calibratedn = 4Tests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“A cutoff of 85% confidence was employed for all modified peptides.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > METHOD DETAILS > Preparation of high and low molecular weight Tau and mass spectrometric analysis
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“Peak boundaries were manually inspected and reassigned as needed to ensure correct peak detection and accurate integration.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > METHOD DETAILS > Preparation of brain tissue samples and mass spectrometry analysis
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“A cutoff of 85% confidence was employed for all modified peptides.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > METHOD DETAILS > Preparation of brain tissue samples and mass spectrometry analysis
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Our data support a processive model (Figure 5C) where 0N and 4R are predisposed to aggregation, cleavage of the C terminus enables fibrillization, followed by phosphorylation in the PRR domain and acetylation and ubiquitination in the MBD, which remove electrostatic repulsion of positively charged lysine residues in this region, promoting Tau fibrilization.”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > DISCUSSION
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“Western Blot analysis using Tau13, Tau46, HT7 and DAKO antibodies confirmed that the fraction 3 and 4 are enriched for Tau (data not shown).”
§ Tau PTM Profiles Identify Patient Heterogeneity and Stages of Alzheimer’s Disease > METHOD DETAILS > Preparation of high and low molecular weight Tau and mass spectrometric analysis
Strength:plain· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
The authors state this as an assumption.
A qualitative and quantitative approach using a large cohort of human AD subjects had not been performed before this study.
“To our knowledge, a qualitative and quantitative approach using a large cohort of human AD subjects has not been performed.”
The authors state this as an assumption.
The minimum set of PTMs important for oligomer formation and Tau aggregation is not known.
“Furthermore, the minimum set of PTMs important for oligomer formation and Tau aggregation is not known.”
The authors state this as an assumption.
Which PTMs occur on Tau seeds that can potentiate further aggregation is not known.
“Finally, it is not known which PTMs occur on Tau seeds that can potentiate further aggregation.”
The paper relies on this without support.
Tau contains 19 lysine residues in its microtubule-binding domain.
“Tau has 19 lysine residues in the MBD”
The paper relies on this without support.
The disordered regions of Tau include the N terminus and the proline-rich region.
“The disordered regions of Tau span the N terminus and PRR.”
The paper relies on this without support.
HMW Tau is oligomeric Tau.
“HMW Tau, which is thought to be oligomeric Tau”
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
In the citing paper
“In examining the clinical records, we found that those cases with the most marked propagation potential also had the fastest clinical course and had characteristic patterns of post-translational modifications (10, 11).”
From All the Tau We Cannot See (2023) · cites this paper as [11]
In the citing paper
“For example, the microtubule-associated protein tau is often measured using antibodies that represent phosphorylation at threonine 181 and one that measures so called “total-tau”. However, at least 95 post-translational modifications have been discovered on tau with potentially many 100s of possible proteoforms resulting from the combinations.(16)”
From Putting humpty dumpty back together again: what does protein quantification mean in bottom-up proteomics? (2022) · cites this paper as [16]
In the citing paper
“Additional studies indicate that specific tau phosphosites may be better indicators of disease progression, emphasizing the importance of distinguishing between different pTau isoforms and proteoforms.(15,16)”
From Putting humpty dumpty back together again: what does protein quantification mean in bottom-up proteomics? (2022) · cites this paper as [16]
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
Acetylation is both unique to seeding-positive Tau and present in seeding-incompetent Tau
MajorOne passage says acetylation is unique to seeding-positive Tau relative to the seeding-negative fractions. The discussion instead says acetylation also occurs in seeding-incompetent Tau.
“we observe acetylation and ubiquitination as being unique to seeding-positive Tau compared with LMW and sarkosyl-soluble seeding-negative fractions.”
“Ubiquitination is unique to seeding-competent Tau, whereas acetylation is also observed in seeding-incompetent Tau.”
Residue 263 is identified as both serine and threonine
MinorThe results identify phosphorylation at S263 in one passage and T263 in another. The same numbered residue cannot have both identities in the Tau sequence being described.
“These PTMs include phosphorylation occurring at adjacent sites (S262 and S263)”
“indicating a higher phosphorylation stoichiometry of this peptide (S262 and T263).”
Citations
Cites
Neuropathological stageing of Alzheimer-related changes.
Braak, H., & Braak, E. (1991) · Acta Neuropathologica · doi:10.1007/bf00308809 · Cited by 16,123 · cited 2×
“Selected subjects had the least possible concurrent pathologies and were assessed for Braak NFT stages (Braak and Braak, 1991), as determined by the location of NFTs with total Tau immunostaining and Bielschowsky’s silver stain.”
BackgroundMethodCox, J., & Mann, M. (2008) · Nature Biotechnology · doi:10.1038/nbt.1511 · Cited by 14,855 · cited 1×
“10 (Cox and Mann, 2008) and peptide list searched against the Homo sapiens Uniprot protein sequence database (December 2017, only reviewed entries appended with common laboratory contaminants [cRAP database, 247 entries]) using the Andromeda search engine (Cox et al.”
MethodAmyloid oligomers exacerbate tau pathology in a mouse model of tauopathy
Selenica, M.-L. B., Brownlow, M., Jimenez, J. P., Lee, D. C., Pena, G., Dickey, C. A., Gordon, M. N., & Morgan, D. (2013) · Neurodegenerative Diseases · doi:10.1159/000337230 · Cited by 10,359
Universal sample preparation method for proteome analysis
Wiśniewski, J. R., Zougman, A., Nagaraj, N., & Mann, M. (2009) · Nature Methods · doi:10.1038/nmeth.1322 · Cited by 8,352
Andromeda: A Peptide Search Engine Integrated into the MaxQuant Environment
Cox, J., Neuhauser, N., Michalski, A., Scheltema, R. A., Olsen, J. V., & Mann, M. (2011) · Journal of Proteome Research · doi:10.1021/pr101065j · Cited by 5,520 · cited 1×
“10 (Cox and Mann, 2008) and peptide list searched against the Homo sapiens Uniprot protein sequence database (December 2017, only reviewed entries appended with common laboratory contaminants [cRAP database, 247 entries]) using the Andromeda search engine (Cox et al., 2011).”
MethodGlenner, G. G., & Wong, C. W. (1984) · Biochemical and Biophysical Research Communications · doi:10.1016/s0006-291x(84)80190-4 · Cited by 5,404 · cited 1×
“Aβ forms extracellular plaques (Glenner and Wong, 1984; Masters et al., 1985), whereas Tau forms intracellular neurofibrillary tangles (NFTs) (Grundke-Iqbal et al.”
BackgroundCox, J., Hein, M. Y., Luber, C. A., Paron, I., Nagaraj, N., & Mann, M. (2014) · Molecular & Cellular Proteomics · doi:10.1074/mcp.m113.031591 · Cited by 5,180 · cited 1×
“Label-free quantification was done using the XIC-based in-built label-free quantification (LFQ) algorithm (Cox et al., 2014) integrated into MaxQuant.”
MethodMirra, S. S., Heyman, A., McKeel, D., Sumi, S. M., Crain, B. J., Brownlee, L. M., Vogel, F. S., Hughes, J. P., Belle, G. V., Berg, L., et al. (1991) · Neurology · doi:10.1212/wnl.41.4.479 · Cited by 4,961 · cited 1×
“Inclusion in the study required a highconfidence postmortem neuropathological diagnosis of AD, based on relevant criteria (Montine et al., 2016; Mirra et al., 1991), for the clinical AD group or no more than low AD neuropathological change (Montine et al.”
MethodSkyline: an open source document editor for creating and analyzing targeted proteomics experiments
MacLean, B., Tomazela, D. M., Shulman, N., Chambers, M., Finney, G. L., Frewen, B., Kern, R., Tabb, D. L., Liebler, D. C., & MacCoss, M. J. (2010) · Bioinformatics · doi:10.1093/bioinformatics/btq054 · Cited by 4,697
Amyloid plaque core protein in Alzheimer disease and Down syndrome.
Masters, C. L., Simms, G., Weinman, N. A., Multhaup, G., McDonald, B. L., & Beyreuther, K. (1985) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.82.12.4245 · Cited by 4,431 · cited 1×
“Aβ forms extracellular plaques (Glenner and Wong, 1984; Masters et al., 1985), whereas Tau forms intracellular neurofibrillary tangles (NFTs) (Grundke-Iqbal et al.”
BackgroundTau in physiology and pathology
Wang, Y., & Mandelkow, E. (2016) · Nature Reviews Neuroscience · doi:10.1038/nrn.2015.1 · Cited by 2,251 · cited 1×
“The mechanistic role of PTMs in initiating Tau seeding and propagation still remains to be elucidated (Guo et al., 2017; Wang and Mandelkow, 2016).”
BackgroundCryo-EM structures of tau filaments from Alzheimer’s disease
Fitzpatrick, A. W. P., Falcon, B., He, S., Murzin, A. G., Murshudov, G., Garringer, H. J., Crowther, R. A., Ghetti, B., Goedert, M., & Scheres, S. H. W. (2017) · Nature · doi:10.1038/nature23002 · Cited by 2,061 · cited 2×
“Sixteen of 17 identified ubiquitination sites are in the microtubule binding domain (MBD), which forms the core of the filament (Crowther et al., 1989; Falcon et al., 2018; Fitzpatrick et al., 2017).”
BackgroundProteoWizard: open source software for rapid proteomics tools development
Kessner, D., Chambers, M., Burke, R., Agus, D., & Mallick, P. (2008) · Bioinformatics · doi:10.1093/bioinformatics/btn323 · Cited by 2,024
Thévenot, E., Roux, A., Xu, Y., Ezan, É., & Junot, C. (2015) · Journal of Proteome Research · doi:10.1021/acs.jproteome.5b00354 · Cited by 1,802
Microtubule-associated protein tau. A component of Alzheimer paired helical filaments.
Grundke, I., Iqbal, K., Quinlan, M., Tung, Y. C., Zaidi, M. S., & Wisniewski, H. M. (1986) · Journal of Biological Chemistry · doi:10.1016/s0021-9258(17)38495-8 · Cited by 1,780
Self-propagation of pathogenic protein aggregates in neurodegenerative diseases
Jucker, M., & Walker, L. C. (2013) · Nature · doi:10.1038/nature12481 · Cited by 1,663 · cited 1×
“During disease progression in AD, pathological neurofibrillary Tau aggregates show a pattern of accumulation that starts in the entorhinal cortex and spreads through connected pathways to cortical areas (Jucker and Walker, 2013).”
BackgroundProteoform: a single term describing protein complexity
The Consortium for Top Down Proteomics, Smith, L. M., & Kelleher, N. L. (2013) · Nature Methods · doi:10.1038/nmeth.2369 · Cited by 1,528
Kosik, K. S., Joachim, C. L., & Selkoe, D. J. (1986) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.83.11.4044 · Cited by 1,491 · cited 1×
“, 1985), whereas Tau forms intracellular neurofibrillary tangles (NFTs) (Grundke-Iqbal et al., 1986; Kosik et al., 1986; Wood et al., 1986).”
BackgroundSelf-citationNeuronal loss correlates with but exceeds neurofibrillary tangles in Alzheimer's disease
Gómez‐Isla, T., Hollister, R., West, H., Mui, S., Growdon, J. H., Petersen, R. C., Parisi, J. E., & Hyman, B. T. (1997) · Annals of Neurology · doi:10.1002/ana.410410106 · Cited by 1,489 · cited 1×
“, 1998) and correlation of Tau pathology with cognitive decline in AD (Arriagada et al., 1992; Bierer et al., 1995; Giannakopoulos et al., 2003; Gómez-Isla et al., 1997) have led to several mechanistic studies whose outcomes have underscored the importance of Tau in AD and other dementias (Mudher et al.”
BackgroundSelf-citationMutation in the tau gene in familial multiple system tauopathy with presenile dementia
Spillantini, M. G., Murrell, J. R., Goedert, M., Farlow, M. R., Klug, A., & Ghetti, B. (1998) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.95.13.7737 · Cited by 1,474 · cited 4×
“The discovery of dominantly inherited Tau mutations leading to frontotemporal dementia (FTD) (Poorkaj et al., 1998; Spillantini et al., 1998) and correlation of Tau pathology with cognitive decline in AD (Arriagada et al., 1992; Bierer et al., 1995; Giannakopoulos et al., 2003; Gómez-Isla et al., 1997) have led to sev…”
BackgroundInfluentialPropagation of Tau Pathology in a Model of Early Alzheimer's Disease
de Calignon, A., Polydoro, M., Suárez-Calvet, M., William, C., Adamowicz, D. H., Kopeikina, K. J., Pitstick, R., Sahara, N., Ashe, K. H., Carlson, G. A., et al. (2012) · Neuron · doi:10.1016/j.neuron.2011.11.033 · Cited by 1,427
Self-citationTau is a candidate gene for chromosome 17 frontotemporal dementia
Poorkaj, P., Bird, T. D., Wijsman, E., Nemens, E., Garruto, R. M., Anderson, L., Andreadis, A., Wiederholt, W. C., Raskind, M., & Schellenberg, G. D. (1998) · Annals of Neurology · doi:10.1002/ana.410430617 · Cited by 1,374 · cited 4×
“The discovery of dominantly inherited Tau mutations leading to frontotemporal dementia (FTD) (Poorkaj et al., 1998; Spillantini et al., 1998) and correlation of Tau pathology with cognitive decline in AD (Arriagada et al., 1992; Bierer et al., 1995; Giannakopoulos et al., 2003; Gómez-Isla et al., 1997) have led to sev…”
BackgroundInfluentialJanelidze, S., Mattsson, N., Palmqvist, S., Smith, R., Beach, T. G., Serrano, G. E., Chai, X., Proctor, N. K., Eichenlaub, U., Zetterberg, H., et al. (2020) · Nature Medicine · doi:10.1038/s41591-020-0755-1 · Cited by 1,247 · cited 2×
“The 16 asymptomatic patients display increased phosphorylation of the PRR, such as T181, which has been reported to be increased in antemortem plasma of individuals with mild cognitive impairment (MCI) (Janelidze et al., 2020; Thijssen et al., 2020).”
BackgroundpcaMethods—a bioconductor package providing PCA methods for incomplete data
Stacklies, W., Redestig, H., Scholz, M., Walther, D., & Selbig, J. (2007) · Bioinformatics · doi:10.1093/bioinformatics/btm069 · Cited by 1,156 · cited 4×
“A uthor M anuscript A uthor M anuscript A uthor M anuscript A uthor M anuscript REAGENT or RESOURCE SOURCE IDENTIFIER MaxQuant Cox lab, Max Planck Institute of Biochemistry, Germany https://www.maxquant.org Perseus Cox lab, Max Planck Institute of Biochemistry, Germany https://maxquant.net/perseus/ R version (3.5.2) R…”
BackgroundMethodInfluentialTangle and neuron numbers, but not amyloid load, predict cognitive status in Alzheimer’s disease
Giannakopoulos, P., Herrmann, F. R., Bussière, T., Bouras, C., Kövari, E., Perl, D. P., Morrison, J. H., Gold, G., & Hof, P. R. (2003) · Neurology · doi:10.1212/01.wnl.0000063311.58879.01 · Cited by 1,118 · cited 1×
“, 1998) and correlation of Tau pathology with cognitive decline in AD (Arriagada et al., 1992; Bierer et al., 1995; Giannakopoulos et al., 2003; Gómez-Isla et al., 1997) have led to several mechanistic studies whose outcomes have underscored the importance of Tau in AD and other dementias (Mudher et al.”
BackgroundGoedert, M., Jakes, R., Spillantini, M. G., Hasegawa, M., Smith, M. J., & Crowther, R. A. (1996) · Nature · doi:10.1038/383550a0 · Cited by 1,036 · cited 1×
“To overcome these electrostatic forces and promote aggregation, charge neutralization of the MBD is required, and anionic experimental cofactor models have been described to promote aggregation: heparin (Goedert et al., 1996; Fichou et al., 2018) and RNA or its associated granules (Kampers et al.”
Lysine Acetylation: Codified Crosstalk with Other Posttranslational Modifications
Yang, X.-J., & Seto, E. (2008) · Molecular Cell · doi:10.1016/j.molcel.2008.07.002 · Cited by 1,006 · cited 1×
“Consistent with previous biochemical studies in mice (Morris et al., 2015; Yang and Seto, 2008), most of the human Tau acetylation sites identified were ubiquitinated alternatively (Figure 1E).”
ResultRoles of tau protein in health and disease
Guo, T., Noble, W., & Hanger, D. P. (2017) · Acta Neuropathologica · doi:10.1007/s00401-017-1707-9 · Cited by 1,003 · cited 1×
“The mechanistic role of PTMs in initiating Tau seeding and propagation still remains to be elucidated (Guo et al., 2017; Wang and Mandelkow, 2016).”
BackgroundAcetylation of Tau Inhibits Its Degradation and Contributes to Tauopathy
Min, S.-W., Cho, S.-H., Zhou, Y., Schroeder, S., Haroutunian, V., Seeley, W. W., Huang, E. J., Shen, Y., Masliah, E., Mukherjee, C., et al. (2010) · Neuron · doi:10.1016/j.neuron.2010.08.044 · Cited by 949 · cited 4×
“The discovery of dominantly inherited Tau mutations leading to frontotemporal dementia (FTD) (Poorkaj et al., 1998; Spillantini et al., 1998) and correlation of Tau pathology with cognitive decline in AD (Arriagada et al., 1992; Bierer et al., 1995; Giannakopoulos et al., 2003; Gómez-Isla et al., 1997) have led to sev…”
BackgroundInfluentialSelf-citationHow many human proteoforms are there?
Aebersold, R., Agar, J. N., Amster, I. J., Baker, M. S., Bertozzi, C. R., Boja, E. S., Costello, C. E., Cravatt, B. F., Fenselau, C., Garcia, B. A., et al. (2018) · Nature Chemical Biology · doi:10.1038/nchembio.2576 · Cited by 907 · cited 1×
“Combinations of such PTMs are responsible for regulating and fine-tuning protein conformation and activity (Aebersold et al., 2018; Soria et al., 2014) and can dramatically change the function and toxicity of proteins.”
BackgroundBramblett, G. T., Goedert, M., Jakes, R., Merrick, S. E., Trojanowski, J. Q., & Lee, V. M. Y. (1993) · Neuron · doi:10.1016/0896-6273(93)90057-x · Cited by 903 · cited 4×
“The discovery of dominantly inherited Tau mutations leading to frontotemporal dementia (FTD) (Poorkaj et al., 1998; Spillantini et al., 1998) and correlation of Tau pathology with cognitive decline in AD (Arriagada et al., 1992; Bierer et al., 1995; Giannakopoulos et al., 2003; Gómez-Isla et al., 1997) have led to sev…”
BackgroundInfluentialPhysical and chemical properties of purified tau factor and the role of tau in microtubule assembly
Cleveland, D. W., Hwo, S. Y., & Kirschner, M. W. (1977) · Journal of Molecular Biology · doi:10.1016/0022-2836(77)90214-5 · Cited by 881 · cited 1×
“Since the discovery of phosphorylation and the first description of isoforms of Tau (Cleveland et al., 1977), the roles of Tau proteoforms (different chemical versions of a polypeptide) have been explored functionally (Adams et al.”
BackgroundAlonso, A. D. C., Zaidi, T., Novak, M., Grundke-Iqbal, I., & Iqbal, K. (2001) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.121119298 · Cited by 827 · cited 1×
“Thus, it has been hypothesized that the types of PTMs, their site-specific localization, and their extent of modification induce or mediate Tau aggregation and propagation (Cohen et al., 2011; Alonso et al., 2001).”
BackgroundBiernat, J., Gustke, N., Drewes, G., Mandelkow, E., & Mandelkow, E. (1993) · Neuron · doi:10.1016/0896-6273(93)90279-z · Cited by 796 · cited 1×
“These sites include three KXGS motifs, which are known to regulate neurite extension and binding of Tau to microtubules (Biernat et al., 1993; Biernat and Mandelkow, 1999).”
BackgroundWood, J. G., Mirra, S. S., Pollock, N. J., & Binder, L. I. (1986) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.83.11.4040 · Cited by 763 · cited 1×
“, 1985), whereas Tau forms intracellular neurofibrillary tangles (NFTs) (Grundke-Iqbal et al., 1986; Kosik et al., 1986; Wood et al., 1986).”
BackgroundAdvancing Research and Treatment for Frontotemporal Lobar Degeneration (ARTFL) investigators, Thijssen, E. H., La Joie, R., Wolf, A., Strom, A., Wang, P., Iaccarino, L., Bourakova, V., Cobigo, Y., Heuer, H., et al. (2020) · Nature Medicine · doi:10.1038/s41591-020-0762-2 · Cited by 761
Self-citationThe acetylation of tau inhibits its function and promotes pathological tau aggregation
Cohen, T. J., Guo, J. L., Hurtado, D. E., Kwong, L. K., Mills, I. P., Trojanowski, J. Q., & Lee, V. M. Y. (2011) · Nature Communications · doi:10.1038/ncomms1255 · Cited by 724 · cited 1×
“Thus, it has been hypothesized that the types of PTMs, their site-specific localization, and their extent of modification induce or mediate Tau aggregation and propagation (Cohen et al., 2011; Alonso et al., 2001).”
BackgroundProteopathic tau seeding predicts tauopathy in vivo
Holmes, B. B., Furman, J. L., Mahan, T. E., Yamasaki, T. R., Mirbaha, H., Eades, W. C., Belaygorod, L., Cairns, N. J., Holtzman, D. M., & Diamond, M. I. (2014) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1411649111 · Cited by 696 · cited 1×
“These Tau fractions do not have positive seeding activity in biosensor assays (Holmes et al., 2014; Takeda et al., 2015).”
BackgroundArriagada, P. V., Marzloff, K., & Hyman, B. T. (1992) · Neurology · doi:10.1212/wnl.42.9.1681 · Cited by 638 · cited 1×
“, 1998) and correlation of Tau pathology with cognitive decline in AD (Arriagada et al., 1992; Bierer et al., 1995; Giannakopoulos et al., 2003; Gómez-Isla et al., 1997) have led to several mechanistic studies whose outcomes have underscored the importance of Tau in AD and other dementias (Mudher et al.”
BackgroundSelf-citationTau protein kinases: Involvement in Alzheimer's disease
Martin, L., Latypova, X., Wilson, C. M., Magnaudeix, A., Perrin, M.-L., Yardin, C., & Terro, F. (2013) · Ageing Research Reviews · doi:10.1016/j.arr.2012.06.003 · Cited by 631
Arendt, T., Stieler, J. T., & Holzer, M. (2016) · Brain Research Bulletin · doi:10.1016/j.brainresbull.2016.08.018 · Cited by 609 · cited 2×
“Although 86 phosphorylation events have been described on Tau in general (Arendt et al., 2016) (i.”
BackgroundMonoclonal antibody AT8 recognises tau protein phosphorylated at both serine 202 and threonine 205
Goedert, M., Jakes, R., & Vanmechelen, E. (1995) · Neuroscience Letters · doi:10.1016/0304-3940(95)11484-e · Cited by 608 · cited 1×
“In some control subjects, these phosphopeptides are further phosphorylated and show some of the same PTMs associated with pathological Tau (Goedert et al., 1995).”
BackgroundUsing i RT , a normalized retention time for more targeted measurement of peptides
Escher, C., Reiter, L., MacLean, B., Ossola, R., Herzog, F., Chilton, J. M., MacCoss, M. J., & Rinner, O. (2012) · PROTEOMICS · doi:10.1002/pmic.201100463 · Cited by 597 · cited 1×
“Vacuumdried peptides were reconstituted in sample buffer (5% formic acid, 5% acetonitrile (ACN)) containing indexed retention time (iRT) peptides (Biognosys) (Escher et al., 2012) and 10 fmol/μl non-labeled FLEX-peptide and 100 fmol/ul heavy-isotope labeled isoform specific peptides (AEEAGIGDTPSL[+7.”
MethodProline-directed and non-proline-directed phosphorylation of PHF-tau
Morishima-Kawashima, M., Hasegawa, M., Takio, K., Suzuki, M., Yoshida, H., Titani, K., & Ihara, Y. (1995) · Journal of Biological Chemistry · doi:10.1074/jbc.270.2.823 · Cited by 557 · cited 1×
“, in vivo, in vitro, and across different organisms and model systems), and over 31 phosphorylation sites have been identified to be associated with physiological functions (Hasegawa et al., 1992; Lovestone and Reynolds, 1997; Morishima Kawashima et al., 1995), only 45 Tau phosphorylation events have so far been descr…”
BackgroundKampers, T., Friedhoff, P., Biernat, J., Mandelkow, E.-M., & Mandelkow, E. (1996) · FEBS Letters · doi:10.1016/s0014-5793(96)01386-5 · Cited by 548 · cited 1×
“, 2018) and RNA or its associated granules (Kampers et al., 1996; Zhang et al., 2017; Dinkel et al., 2015).”
BackgroundCritical role of acetylation in tau-mediated neurodegeneration and cognitive deficits
Min, S.-W., Chen, X., Tracy, T. E., Li, Y., Zhou, Y., Wang, C., Shirakawa, K., Minami, S. S., Defensor, E., Mok, S. A., et al. (2015) · Nature Medicine · doi:10.1038/nm.3951 · Cited by 516 · cited 1×
“, 2018) and in postmortem human studies (Hanger et al., 2007; Min et al., 2015).”
BackgroundNeocortical Neurofibrillary Tangles Correlate With Dementia Severity in Alzheimer's Disease
Bierer, L. M., Hof, P. R., Purohit, D. P., Carlin, L., Schmeidler, J., Davis, K. L., & Perl, D. P. (1995) · Archives of Neurology · doi:10.1001/archneur.1995.00540250089017 · Cited by 514 · cited 1×
“, 1998) and correlation of Tau pathology with cognitive decline in AD (Arriagada et al., 1992; Bierer et al., 1995; Giannakopoulos et al., 2003; Gómez-Isla et al., 1997) have led to several mechanistic studies whose outcomes have underscored the importance of Tau in AD and other dementias (Mudher et al.”
BackgroundMorris, M., Knudsen, G. M., Maeda, S., Trinidad, J. C., Ioanoviciu, A., Burlingame, A. L., & Mucke, L. (2015) · Nature Neuroscience · doi:10.1038/nn.4067 · Cited by 472 · cited 2×
“Consistent with previous biochemical studies in mice (Morris et al., 2015; Yang and Seto, 2008), most of the human Tau acetylation sites identified were ubiquitinated alternatively (Figure 1E).”
BackgroundResultHanger, D. P., Byers, H. L., Wray, S., Leung, K.-Y., Saxton, M. J., Seereeram, A., Reynolds, C. H., Ward, M. A., & Anderton, B. H. (2007) · Journal of Biological Chemistry · doi:10.1074/jbc.m703269200 · Cited by 455 · cited 3×
“Besides phosphorylation, the neurofibrillary aggregates are also subject to a wide range of other PTMs (Hanger et al., 2007).”
BackgroundGlobal Hairpin Folding of Tau in Solution
Jeganathan, S., von Bergen, M., Brutlach, H., Steinhoff, H.-J., & Mandelkow, E. (2006) · Biochemistry · doi:10.1021/bi0521543 · Cited by 432 · cited 2×
“neutralizing positive charges of the MBD lysines by folding back on the MBD in a modified version of the previously described hairpin structure (Jeganathan et al., 2006), where the phosphorylated C terminus and phosphorylated PRR domain stabilize the positive charge of the MBD.”
BackgroundProtein sequence and mass spectrometric analyses of tau in the Alzheimer's disease brain
Hasegawa, M., Morishima-Kawashima, M., Takio, K., Suzuki, M., Titani, K., & Ihara, Y. (1992) · Journal of Biological Chemistry · doi:10.1016/s0021-9258(18)41890-x · Cited by 430 · cited 1×
“, in vivo, in vitro, and across different organisms and model systems), and over 31 phosphorylation sites have been identified to be associated with physiological functions (Hasegawa et al., 1992; Lovestone and Reynolds, 1997; Morishima Kawashima et al., 1995), only 45 Tau phosphorylation events have so far been descr…”
BackgroundWhat is the evidence that tau pathology spreads through prion-like propagation?
Mudher, A., Colin, M., Dujardin, S., Medina, M., Dewachter, I., Alavi Naini, S. M., Mandelkow, E.-M., Mandelkow, E., Buée, L., Goedert, M., et al. (2017) · Acta Neuropathologica Communications · doi:10.1186/s40478-017-0488-7 · Cited by 384 · cited 1×
“…of Tau pathology with cognitive decline in AD (Arriagada et al., 1992; Bierer et al., 1995; Giannakopoulos et al., 2003; Gómez-Isla et al., 1997) have led to several mechanistic studies whose outcomes have underscored the importance of Tau in AD and other dementias (Mudher et al., 2017).”
ResultSelf-citationTakeda, S., Wegmann, S., Cho, H., DeVos, S. L., Commins, C., Roe, A. D., Nicholls, S. B., Carlson, G. A., Pitstick, R., Nobuhara, C. K., et al. (2015) · Nature Communications · doi:10.1038/ncomms9490 · Cited by 371 · cited 8×
“It has been suggested that brain lysates seed Tau aggregation when high-molecular-weight oligomeric hyperphosphorylated (AT8 and AT100) Tau species are present (Takeda et al., 2015; Jackson et al., 2016).”
BackgroundMethodInfluentialSelf-citationTau filaments from multiple cases of sporadic and inherited Alzheimer's disease adopt a common fold
Falcon, B., Zhang, W., Schweighauser, M., Murzin, A. G., Vidal, R., Garringer, H. J., Ghetti, B., Scheres, S. H. W., & Goedert, M. (2018) · Acta Neuropathologica · doi:10.1007/s00401-018-1914-z · Cited by 362 · cited 1×
“Sixteen of 17 identified ubiquitination sites are in the microtubule binding domain (MBD), which forms the core of the filament (Crowther et al., 1989; Falcon et al., 2018; Fitzpatrick et al., 2017).”
BackgroundRNA stores tau reversibly in complex coacervates
Zhang, X., Lin, Y., Eschmann, N. A., Zhou, H., Rauch, J. N., Hernández, I., Guzman, E., Kosik, K. S., & Han, S. (2017) · PLoS Biology · doi:10.1371/journal.pbio.2002183 · Cited by 312 · cited 1×
“, 2018) and RNA or its associated granules (Kampers et al., 1996; Zhang et al., 2017; Dinkel et al., 2015).”
BackgroundSelf-citationLovestone, S., & Reynolds, C. H. (1997) · Neuroscience · doi:10.1016/s0306-4522(96)00577-5 · Cited by 278 · cited 1×
“, in vivo, in vitro, and across different organisms and model systems), and over 31 phosphorylation sites have been identified to be associated with physiological functions (Hasegawa et al., 1992; Lovestone and Reynolds, 1997; Morishima Kawashima et al., 1995), only 45 Tau phosphorylation events have so far been descr…”
BackgroundTau protein phosphatases in Alzheimer's disease: The leading role of PP2A
Martin, L., Latypova, X., Wilson, C. M., Magnaudeix, A., Perrin, M.-L., & Terro, F. (2012) · Ageing Research Reviews · doi:10.1016/j.arr.2012.06.008 · Cited by 265
Mechanisms of Protein Seeding in Neurodegenerative Diseases
Walker, L. C., Diamond, M. I., Duff, K. E., & Hyman, B. T. (2013) · JAMA Neurology · doi:10.1001/jamaneurol.2013.1453 · Cited by 226 · cited 2×
“During disease progression in AD, pathological neurofibrillary Tau aggregates show a pattern of accumulation that starts in the entorhinal cortex and spreads through connected pathways to cortical areas (Jucker and Walker, 2013).”
BackgroundSelf-citationcAMP-Dependent Protein Kinase Phosphorylations on Tau in Alzheimer’s Disease
Jicha, G. A., Weaver, C. L., Lane, E., Vianna, C., Kress, Y., Rockwood, J. M., & Davies, P. (1999) · Journal of Neuroscience · doi:10.1523/jneurosci.19-17-07486.1999 · Cited by 207
Self-citationJackson, S. J., Kerridge, C., Cooper, J., Cavallini, A., Falcon, B., Cella, C. V., Landi, A., Szekeres, P. G., Murray, T. K., Ahmed, Z., et al. (2016) · Journal of Neuroscience · doi:10.1523/jneurosci.3542-15.2016 · Cited by 163 · cited 1×
“It has been suggested that brain lysates seed Tau aggregation when high-molecular-weight oligomeric hyperphosphorylated (AT8 and AT100) Tau species are present (Takeda et al., 2015; Jackson et al., 2016).”
BackgroundBiernat, J., & Mandelkow, E.-M. (1999) · Molecular Biology of the Cell · doi:10.1091/mbc.10.3.727 · Cited by 149 · cited 1×
“These sites include three KXGS motifs, which are known to regulate neurite extension and binding of Tau to microtubules (Biernat et al., 1993; Biernat and Mandelkow, 1999).”
BackgroundFLEXITau: Quantifying Post-translational Modifications of Tau Protein in Vitro and in Human Disease
Mair, W., Muntel, J., Tepper, K., Tang, S., Biernat, J., Seeley, W. W., Kosik, K. S., Mandelkow�, E., Steen, H., & Steen, J. A. J. (2016) · Analytical Chemistry · doi:10.1021/acs.analchem.5b04509 · Cited by 144 · cited 5×
“To quantify absolute Tau amounts and determine the extent of Tau PTMs, sarkosyl-insoluble and soluble fractions were processed using the FLEXITau workflow as previously described (Mair et al., 2016).”
BackgroundMethodInfluentialSelf-citation“Prion‐Like” Templated Misfolding in Tauopathies
Clavaguera, F., Lavenir, I., Falcon, B., Frank, S., Goedert, M., & Tolnay, M. (2013) · Brain Pathology · doi:10.1111/bpa.12044 · Cited by 133 · cited 1×
“This encompasses a cycle that involves production of a Tau seed followed by uptake of seed-competent Tau into connected cells (Clavaguera et al., 2013).”
BackgroundCofactors are essential constituents of stable and seeding-active tau fibrils
Fichou, Y., Lin, Y., Rauch, J. N., Vigers, M., Zeng, Z., Srivastava, M., Keller, T. J., Freed, J. H., Kosik, K. S., & Han, S. (2018) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1810058115 · Cited by 128 · cited 1×
“To overcome these electrostatic forces and promote aggregation, charge neutralization of the MBD is required, and anionic experimental cofactor models have been described to promote aggregation: heparin (Goedert et al., 1996; Fichou et al., 2018) and RNA or its associated granules (Kampers et al.”
BackgroundSingh, S. A., Springer, M., Steen, J. A. J., Kirschner, M. W., & Steen, H. (2009) · Journal of Proteome Research · doi:10.1021/pr800654s · Cited by 113 · cited 1×
“Absolute abundance of Tau was calculated using the FLEX peptide L/H ratio as described before (Singh et al., 2009).”
MethodSelf-citationMultisite assessment of NIA‐AA guidelines for the neuropathologic evaluation of Alzheimer's disease
Montine, T. J., Monsell, S. E., Beach, T. G., Bigio, E. H., Bu, Y., Cairns, N. J., Frosch, M., Henriksen, J., Kofler, J., Kukull, W. A., et al. (2016) · Alzheimer's & Dementia · doi:10.1016/j.jalz.2015.07.492 · Cited by 113 · cited 2×
“Inclusion in the study required a highconfidence postmortem neuropathological diagnosis of AD, based on relevant criteria (Montine et al., 2016; Mirra et al., 1991), for the clinical AD group or no more than low AD neuropathological change (Montine et al.”
BackgroundMethodSelf-citationThree Repeat Isoforms of Tau Inhibit Assembly of Four Repeat Tau Filaments
Adams, S. J., Deture, M. A., McBride, M., Dickson, D. W., & Petrucelli, L. (2010) · PLoS ONE · doi:10.1371/journal.pone.0010810 · Cited by 110 · cited 1×
“, 1977), the roles of Tau proteoforms (different chemical versions of a polypeptide) have been explored functionally (Adams et al., 2010), and many of these studies have highlighted the importance of post-translational modifications (PTMs) of Tau in AD and FTD (Bramblett et al.”
BackgroundCrowther, T., Goedert, M., & Wischik, C. M. (1989) · Annals of Medicine · doi:10.3109/07853898909149199 · Cited by 107 · cited 1×
“Sixteen of 17 identified ubiquitination sites are in the microtubule binding domain (MBD), which forms the core of the filament (Crowther et al., 1989; Falcon et al., 2018; Fitzpatrick et al., 2017).”
BackgroundRNA Binds to Tau Fibrils and Sustains Template-Assisted Growth
Dinkel, P. D., Holden, M. R., Matin, N., & Margittai, M. (2015) · Biochemistry · doi:10.1021/acs.biochem.5b00453 · Cited by 85 · cited 1×
“, 2018) and RNA or its associated granules (Kampers et al., 1996; Zhang et al., 2017; Dinkel et al., 2015).”
BackgroundQuantitative Analysis of the Brain Ubiquitylome in Alzheimer's Disease
Abreha, M. H., Dammer, E. B., Ping, L., Zhang, T., Duong, D. M., Gearing, M., Lah, J. J., Levey, A. I., & Seyfried, N. T. (2018) · PROTEOMICS · doi:10.1002/pmic.201800108 · Cited by 82 · cited 1×
“A total of 28 ubiquitination sites have been identified previously on Tau extracted from postmortem AD brain total lysates using ubiquitination enrichment (Abreha et al., 2018).”
BackgroundSigurdsson, E. M. (2018) · Journal of Alzheimer s Disease · doi:10.3233/jad-179937 · Cited by 76 · cited 2×
“1% of all antibodies can cross the blood-brain barrier (BBB), increasing the specificity and affinity of the intended therapeutic antibody for the pathologic form of Tau is essential for successful therapy (Sigurdsson, 2018).”
BackgroundInfluentialCo‐regulation proteomics reveals substrates and mechanisms of APC/C‐dependent degradation
Singh, S., Winter, D., Kirchner, M., Chauhan, R. S., Ahmed, S. S. E.-D., Özlü, N., Tzur, A., van der Steen, J. A., & Steen, H. (2014) · The EMBO Journal · doi:10.1002/embj.201385876 · Cited by 73 · cited 1×
“Although several PTMs are present at basal levels in cells, not all of these are functionally significant in the context of specific pathological conditions (Singh et al., 2014).”
BackgroundSelf-citationJicha, G. A., Donnell, A. O., Weaver, C., Angeletti, R., & Davies, P. (1999) · Journal of Neurochemistry · doi:10.1046/j.1471-4159.1999.0720214.x · Cited by 71
Self-citationWhen less can yield more – Computational preprocessing of MS/MS spectra for peptide identification
Renard, B. Y., Kirchner, M., Monigatti, F., Ivanov, A. R., Rappsilber, J., Winter, D., Steen, J. A. J., Hamprecht, F. A., & Steen, H. (2009) · PROTEOMICS · doi:10.1002/pmic.200900326 · Cited by 70 · cited 1×
“, 2008) The spectra were centroided and filtered using ms2preproc to select the 6 most intense peaks in a 30 Th window (Renard et al., 2009).”
MethodSelf-citationTau Immunotherapies for Alzheimer’s Disease and Related Tauopathies: Progress and Potential Pitfalls
Sigurdsson, E. M. (2018) · Journal of Alzheimer s Disease · doi:10.3233/jad-189010 · Cited by 67
Functional Divergence for Every Paralog
Soria, P. S., McGary, K. L., & Rokas, A. (2014) · Molecular Biology and Evolution · doi:10.1093/molbev/msu050 · Cited by 55 · cited 1×
“Combinations of such PTMs are responsible for regulating and fine-tuning protein conformation and activity (Aebersold et al., 2018; Soria et al., 2014) and can dramatically change the function and toxicity of proteins.”
BackgroundTramutola, A., Sharma, N. K., Barone, E., Lanzillotta, C., Castellani, A., Iavarone, F., Vincenzoni, F., Castagnola, M., Butterfield, D. A., Gaetani, S., et al. (2018) · Biochimica et Biophysica Acta (BBA) - Molecular Basis of Disease · doi:10.1016/j.bbadis.2018.07.017 · Cited by 44 · cited 2×
“, 2013a, 2013b) and in vivo AD mouse models (Morris et al., 2015; Tramutola et al., 2018) and in postmortem human studies (Hanger et al.”
BackgroundTau Imaging in Alzheimer's Disease Diagnosis and Clinical Trials
Brosch, J. R., Farlow, M. R., Risacher, S. L., & Apostolova, L. G. (2016) · Neurotherapeutics · doi:10.1007/s13311-016-0490-y · Cited by 37 · cited 1×
“For example, to develop a Tau PET radiotracer for detection of disease before cognitive decline, the chemical composition and abundance of pathological species at early disease stages is essential (Brosch et al., 2017).”
Background
Flagged first, then by citations
Research works printed but not linked: 2
- Lê, 2008, FactoMineR: A Package for Multivariate Analysis, J. Stat. Softw., 25
- Lovestone, 1997, The phosphorylation of tau: a critical stage in neurodevelopment and neurodegenerative processes, Neuroscience, 78, 309
Cited by
Sorted by citations
Biomarkers for neurodegenerative diseases
Hansson, O. (2021) · Nature Medicine · doi:10.1038/s41591-021-01382-x · Cited by 1,159
Blood-based biomarkers for Alzheimer's disease: towards clinical implementation
Teunissen, C. E., Verberk, I. M. W., Thijssen, E. H., Vermunt, L., Hansson, O., Zetterberg, H., van der Flier, W. M., Mielke, M. M., & del Campo, M. (2022) · The Lancet Neurology · doi:10.1016/s1474-4422(21)00361-6 · Cited by 1,045
The sirtuin family in health and disease
Wu, Q., Zhang, T., Chen, H., Yu, X., Lv, J.-L., Liu, Y., Liu, Y., Zheng, G., Zhao, J.-Q., Wei, Y., et al. (2022) · Signal Transduction and Targeted Therapy · doi:10.1038/s41392-022-01257-8 · Cited by 928
Thijssen, E. H., La Joie, R., Strom, A., Fonseca, C., Iaccarino, L., Wolf, A., Spina, S., Allen, I. E., Cobigo, Y., Heuer, H., et al. (2021) · The Lancet Neurology · doi:10.1016/s1474-4422(21)00214-3 · Cited by 607
Self-citationApplications of multi‐omics analysis in human diseases
Chen, C., Wang, J., Pan, D., Wang, X., Xu, Y., Yan, J., Wang, L., Yang, X., Yang, M., & Liu, G. (2023) · MedComm · doi:10.1002/mco2.315 · Cited by 545
Metadata
- Authors
- Wesseling, H., Mair, W., Kumar, M., Schlaffner, C. N., Tang, S., Beerepoot, P., Fatou, B., Guise, A. J., Cheng, L., Takeda, S., Muntel, J., Rotunno, M. S., Dujardin, S., Davies, P., Kosik, K. S., Miller, B. L., Berretta, S., Hedreen, J. C., Grinberg, L. T., Seeley, W. W., Hyman, B. T., Steen, H., & Steen, J. A.
- Affiliations
- Boston Children's Hospital (US)
- Harvard University (US)
- Feinstein Institute for Medical Research (US)
- University of California, Santa Barbara (US)
- University of California, San Francisco (US)
- Corresponding author
- Steen, Judith A.
- ORCID
- Kumar, Mukesh
- Schlaffner, Christoph N.
- Tang, Shaojun
- Beerepoot, Pieter
- Fatou, Benoit
- Guise, Amanda J.
- Cheng, Long
- Takeda, Shuko
- Muntel, Jan
- Dujardin, Simon
- Davies, Peter
- Kosik, Kenneth S.
- Miller, Bruce L.
- Berretta, Sabina
- Hedreen, John C.
- Grinberg, Lea T.
- Seeley, William W.
- Hyman, Bradley T.
- Steen, Hanno
- Steen, Judith A.
- Venue
- Cell
- Publisher
- Elsevier BV
- Published
- 2020-12
- Volume
- 183
- Issue
- 6
- Pages
- 1699-1713.e13
- ISSN
- 0092-8674 (ISSN-L)
- PMC
- PMC8168922
- OpenAlex
- W3102160053
- Semantic Scholar
- eb7657dfe7b98f7376299bf9d45805d3dc70eb6d
- Cited by
- 688
- References
- 78
- Citations by year
- 2026: 104 · 2025: 132 · 2024: 140 · 2023: 112 · 2022: 109 · 2021: 88 · 2020: 2
- FWCI
- 47.08
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Cell (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- Funders
- National Institutes of Health
- Tau Consortium
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Alzheimer's disease research and treatments
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Physical Sciences › Chemistry › Spectroscopy › Advanced Proteomics Techniques and Applications
- Keywords
- Alzheimer's disease, tau protein, post-translational modification, tau isoforms, tau aggregation, seeding activity, patient heterogeneity, disease staging, proline-rich region, microtubule-binding domain, postmortem brain, quantitative proteomics
- MeSH terms
- Alzheimer Disease, Humans, Protein Processing, Post-Translational, Cohort Studies, Case-Control Studies, tau Proteins, Disease Progression, Protein Isoforms, Principal Component Analysis
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
A language model drew the claims from the paper on 2026-10-07, under version 3 of the claim definition (model deepseek-v4.1-flash, prompt extract-v3).
A second model labelled each claim on 2026-10-07 (model jev-1.13-20260917, definition revision gold-guideline-v0.2).
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review