Cited by 102Hereditary Neurological DisordersCellular transport and secretionPeripheral Neuropathies and Disorders

The DOI matches its Crossref record; 53 of the 53 references it cites were found in a registry or an index; none of the 45 sources its claims cite is checked for support yet.

SH3TC2, a protein mutant in Charcot–Marie–Tooth neuropathy, links peripheral nerve myelination to endosomal recycling

Open access

Abstract

Patients with Charcot-Marie-Tooth neuropathy and gene targeting in mice revealed an essential role for the SH3TC2 gene in peripheral nerve myelination. SH3TC2 expression is restricted to Schwann cells in the peripheral nervous system, and the gene product, SH3TC2, localizes to the perinuclear recycling compartment. Here, we show that SH3TC2 interacts with the small guanosine triphosphatase Rab11, which is known to regulate the recycling of internalized membranes and receptors back to the cell surface. Results of protein binding studies and transferrin receptor trafficking are in line with a role of SH3TC2 as a Rab11 effector molecule. Consistent with a function of Rab11 in Schwann cell myelination, SH3TC2 mutations that cause neuropathy disrupt the SH3TC2/Rab11 interaction, and forced expression of dominant negative Rab11 strongly impairs myelin formation in vitro. Our data indicate that the SH3TC2/Rab11 interaction is relevant for peripheral nerve pathophysiology and place endosomal recycling on the list of cellular mechanisms involved in Schwann cell myelination.

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

SH3TC2, the protein mutated in Charcot–Marie–Tooth disease type 4C (CMT4C), is a direct Rab11 effector localized to the endosomal recycling compartment, and CMT4C missense mutations disrupt this interaction. Rab11 activity regulates Schwann cell myelination in vitro, linking endosomal recycling to peripheral nerve myelination.

Key findings

  • SH3TC2 was identified as a direct Rab11 interactor by tandem affinity purification/mass spectrometry, coimmunoprecipitation, GST pulldown, and yeast two-hybrid assays; binding was specific to Rab11 and occurred with active GTP-bound Rab11_Q70L but not dominant-negative Rab11_S25N or the effector-domain mutant Rab11a_Q70L_I44E.
  • All tested CMT4C-associated missense substitutions (five in Fig. 4A) disrupted SH3TC2/Rab11a binding, while rodent Sh3tc2 still bound human Rab11a despite ~20% nonconserved residues.
  • Wild-type SH3TC2 slowed transferrin receptor recycling and condensed Rab11a-positive perinuclear recycling endosomes; the N881S mutant had only a slight effect. In Sh3tc2 knockout sciatic nerves, Rab11a protein levels were reduced while Rab11a mRNA was unchanged.
  • In in vitro myelination, dominant-negative Rab11a_S25N strongly impaired myelin basic protein-positive segments, whereas constitutively active Rab11a_Q70L increased myelination in dorsal root ganglion explants and Schwann cell/neuron co-cultures.

Methods

  • Protein interactions were assayed by tandem affinity purification from inducible SH3TC2-C-TAP Flp-In T-REx 293 cells followed by mass spectrometry, coimmunoprecipitation in HEK293 cells, GST pulldown with in vitro translated SH3TC2/Sh3tc2 and Rab11 mutants, and yeast two-hybrid.
  • Cell biology included immunofluorescence in HEK293, COS7, and RT4-D6P2T cells; subcellular fractionation on 5–25% Optiprep gradients; transferrin recycling by FACS (2000 GFP-positive cells, three repeats); and Rab11a surface reconstruction in 100 transfected COS7 cells per condition.
  • Myelination was assessed in mouse embryonic day 13.5 dorsal root ganglion explants and rat Schwann cell/mouse dorsal root ganglion neuron co-cultures transduced with lentiviral GFP, Rab11a_Q70L-GFP, or Rab11a_S25N-GFP; myelin basic protein staining was quantified from 10 fields per coverslip in triplicate experiments with at least three coverslips per condition, using mean ± SEM and two-tailed Student’s t-test.

Limitations

  • Stated: the authors could not identify the specific SH3TC2 protein region or a shorter linear motif mediating Rab11 binding, and CMT4C substitutions disrupting the complex are spread throughout the protein.
  • Stated: SH3TC2 may also influence myelination in a Rab11-independent manner, and other proteins in the SH3TC2 complex were not investigated for PNS/Schwann cell roles.
  • Stated/evident: no antibody against endogenous Sh3tc2 was available, so the Schwann cell line had to be transfected with a FLAG construct; the findings rely heavily on overexpression and in vitro myelination systems, with no in vivo rescue of the SH3TC2/Rab11 interaction.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1093/brain/awq168

Cites

53 of 53 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Verification

Claims the paper makes

0 of 45 cited sources checked · 0 supported · 0 flagged

  • Findingown data

    Expression of constitutively active Rab11a increases myelin formation/myelinated segments in vitro.

    “On the other hand, infection with a lentivirus containing constitutively active Rab11a resulted in an increased number of myelinated segments (Supplementary Fig. 5A and B).”
    • Also stated in: § Results · plain
      “expression of the constitutively active Rab11a resulted in moderately increased myelination (Fig. 6A and B).”
    Quote in the paperSubstantial claim
  • Findingown data

    SH3TC2 does not colocalize with marker proteins for other perinuclear organelles.

    “Conversely, we observed no colocalization of SH3TC2 with marker proteins for other perinuclear organelles (Supplementary Fig. 3).”
    Quote in the paperNot a substantial claim
  • Findingown data

    SH3TC2 and Rab11a localization overlaps in the perinuclear region in HEK293, COS7 and RT4-D6P2T cell lines.

    “The localization of both proteins overlapped in the perinuclear region in all three cell lines (Fig. 2A).”
    Quote in the paperSubstantial claim
  • Findingown data

    Overexpression of wild-type SH3TC2 moderately slows transferrin recycling compared with CMT4C mutants or GFP control.

    “Overexpression of wild-type SH3TC2 resulted in moderate slowing of transferrin recycling as compared with transferrin retention in cells transfected with CMT4C mutants or a GFP control vector (Fig. 5B and Supplementary Table 1).”
    Quote in the paperSubstantial claim
  • Findingown data

    SH3TC2 interacts with Rab11.

    “Here, we show that SH3TC2 interacts with the small guanosine triphosphatase Rab11, which is known to regulate the recycling of internalized membranes and receptors back to the cell surface.”
    • Also stated in: § Results · plain
      “In addition to the co-precipitation of Rab11a along with SH3TC2, immunoprecipitation in the other direction showed that SH3TC2 could be coprecipitated with GFP-Rab11a as well (Fig. 1C).”
    Quote in the paperSubstantial claim
  • It may state two separate claims as one. 11
  • Probably not a substantial claim. 20
  • It may state two separate claims as one.

    Findingown data

    SH3TC2 does not bind dominant negative GDP-bound Rab11_S25N or Rab11a_Q70L_I44E.

    “while there is no binding to the dominant negative guanosine diphosphate-bound Rab11_S25N mutants or to Rab11a_Q70L_I44E, a constitutively active mutant which has a second mutation in its effector domain abrogating effector binding (Wallace et al., 2002) (Fig. 5A and Supplementary Fig. 4B).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Wallace et al., 2002 source
  • It may state two separate claims as one.

    Findingown data

    SH3TC2 does not associate with Rab4a, Rab5a, or Rab7a.

    “No association was observed with Rab4a and Rab5a (associated with early endosomes) and Rab7a (associated with late endosomes) (Supplementary Fig. 4A).”
    Quote in the paperSubstantial claim
  • It may state two separate claims as one.

    Findingown data

    Rab11a is prominently expressed in cultured Schwann cells and in the PNS of adult animals.

    “We found that Rab11a was prominently expressed in cultured Schwann cells and in the PNS of adult animals.”
    Quote in the paperSubstantial claim
  • It may state two separate claims as one.

    Premisecitation

    SH3TC2 localizes to the plasma membrane and a perinuclear membranous structure corresponding to the endocytic recycling compartment.

    “the gene product, SH3TC2, localizes to the perinuclear recycling compartment.”
    • Also stated in: § Introduction · plain
      “localizes to the plasma membrane and a perinuclear membranous structure (Arnaud et al., 2009;Lupo et al., 2009) that corresponds to the endocytic recycling compartment (Arnaud et al., 2009).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Arnaud et al., 2009;Lupo et al., 2009

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    Myelin proteins undergo endocytic recycling in oligodendrocytes, which are the myelinating glia cells in the CNS.

    “Finally, myelin proteins undergo endocytic recycling in oligodendrocytes (Winterstein et al., 2008), which are the myelinating glia cells in the CNS.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Winterstein et al., 2008 source
  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    A crucial mechanism underlying establishment and maintenance of cellular polarity is differential sorting of proteins to distinct plasma membrane domains along the secretory and endosomal pathways.

    “One crucial mechanism underlying establishment and maintenance of cellular polarity is differential sorting of proteins to distinct plasma membrane domains along the secretory and endosomal pathways (Keller et al., 2001;Kreitzer et al., 2003).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites Keller et al., 2001 source
    • cites Kreitzer et al., 2003 source
  • Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

    Premisecitation

    Membranes of Schwann cell microvilli contain ligands for axonal cell adhesion molecules and contribute to sodium channel clustering at the nodes of Ranvier.

    “Finally, the membranes of Schwann cell microvilli contain ligands for axonal cell adhesion molecules and contribute to sodium channel clustering at the nodes of Ranvier (Eshed et al., 2005).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Eshed et al., 2005 source
  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    Membranes of the paranodal loops are enriched for junctional proteins that permit intra-Schwann cell junctions and Schwann cell-axon junctions.

    “Membranes of the paranodal loops are enriched for junctional proteins that permit intra-Schwann cell junctions and Schwann cell-axon junctions (Fannon et al., 1995;Boyle et al., 2001).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites Fannon et al., 1995 source
    • cites Boyle et al., 2001 source
  • Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

    Premisecitation

    During myelination, Schwann cells establish specialized microtubule networks, suggesting increased rates of vesicle transport.

    “During myelination, Schwann cells establish specialized microtubule networks, suggesting increased rates of vesicle transport (Trapp et al., 1995;Kidd et al., 1996).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites Trapp et al., 1995 source
    • cites Kidd et al., 1996 source
  • It may state two separate claims as one.

    Interpretationreasoning

    The mutated residues are all found on the surface of the protein, forming an extended Rab11-interacting domain.

    “Therefore, a more likely explanation would be that the mutated residues are all found on the surface of the protein, forming an extended Rab11-interacting domain.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

    Premisecitation

    The outer (abaxonal) Schwann cell plasma membrane is specialized for extracellular interactions, while the inner (adaxonal) Schwann cell plasma membrane contains cell adhesion molecules.

    “The outer (abaxonal) Schwann cell plasma membrane is specialized for extracellular interactions, while the inner (adaxonal) Schwann cell plasma membrane contains cell adhesion molecules (Previtali et al., 2001;Maurel et al., 2007;Spiegel et al, 2007).”
    Quote in the paperNot a substantial claim0 of 3 sources checked
    • cites Previtali et al., 2001 source
    • cites Maurel et al., 2007 source
    • cites Spiegel et al, 2007 source
  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    Rab11 is a key regulator of recycling pathways from endosomes to the plasma membrane.

    “Rab11 is a key regulator of recycling pathways from endosomes to the plasma membrane (Ullrich et al., 1996) and consists of two isoforms, Rab11a and Rab11b, which are encoded by different genes and mainly differ in their C-termini.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Ullrich et al., 1996 source
  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    Rab11 is a master regulator of recycling endosome functions.

    “Rab11, a master regulator of recycling endosome functions (Maxfield and McGraw, 2004)”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Maxfield and McGraw, 2004 source
  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    An extended interaction domain consisting of several tetratricopeptide repeat repeats (which are contained in SH3TC2 as well) has been reported to enable p67phox to interact with Rac1, a small GTPase of the Rho family.

    “An extended interaction domain consisting of several tetratricopeptide repeat repeats (which are contained in SH3TC2 as well) has been reported to enable p67phox to interact with Rac1, a small GTPase of the Rho family (Lapouge et al., 2000).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Lapouge et al., 2000 source
  • Probably not a substantial claim.

    Premisecitation

    Rab effectors can stabilize Rab-GTPases.

    “as it has been shown that Rab effectors can stabilize Rab-GTPases (Ganley et al., 2004).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Ganley et al., 2004 source
  • Probably not a substantial claim.

    Premisecitation

    Protein transport and targeting play an important role in myelin membrane assembly.

    “Several lines of evidence indicate that protein transport and targeting play an important role in myelin membrane assembly.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    Assays for transferrin receptor recycling are commonly used as a paradigm to test recycling endosome functions.

    “Assays for transferrin receptor recycling are commonly used as a paradigm to test recycling endosome functions (Sager et al., 1984).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Sager et al., 1984 source
  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    Rab11-FIP4 causes a dramatic condensation of the recycling endosome.

    “There is at least one known Rab11 effector, Rab11-FIP4, which causes a dramatic condensation of the recycling endosome (Wallace et al., 2002).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Wallace et al., 2002 source
  • Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

    Premisecitation

    Another article reported the SH3TC2/Rab11 interaction and a potential effect of SH3TC2 on recycling endosome function.

    “During the preparation our manuscript, another article reporting the SH3TC2/Rab11 interaction and a potential effect of SH3TC2 on recycling endosome function was published (Roberts et al., 2010).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Roberts et al., 2010 source
  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    In polarized epithelial cells, transfected Schwann cell proteins are distinctly transported, potentially reflecting the segregation of compact and non-compact myelin components.

    “Similarly, in polarized epithelial cells, transfected Schwann cell proteins are distinctly transported, potentially reflecting the segregation of compact and non-compact myelin components (Minuk and Braun, 1996;Kroepfl and Gardinier, 2001;Maier et al., 2006).”
    Quote in the paperNot a substantial claim0 of 3 sources checked
    • cites Minuk and Braun, 1996 source
    • cites Kroepfl and Gardinier, 2001 source
    • cites Maier et al., 2006 source
  • Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

    Premisecitation

    Myelination requires dramatic changes in the cellular architecture of differentiating glia and a high degree of cell polarization that partitions the plasma membrane into distinct domains.

    “Myelination requires dramatic changes in the cellular architecture of differentiating glia and a high degree of cell polarization that partitions the plasma membrane into distinct domains (Pfeiffer et al., 1993).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Pfeiffer et al., 1993 source
  • Probably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.

    Premisecitation

    Compact myelin in the PNS is largely composed of lipids (mainly cholesterol and sphingolipids) and exhibits narrow lamellar spacings, mediated by homophilic adhesion molecules.

    “Compact myelin in the PNS is largely composed of lipids (mainly cholesterol and sphingolipids) and exhibits narrow lamellar spacings, mediated by homophilic adhesion molecules (Filbin et al., 1990).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Filbin et al., 1990 source
  • Probably not a substantial claim.

    Premisecitation

    Endosomal sorting is required for the development and maintenance of Schwann cells and the myelin sheath.

    “As there is increasing evidence that the development and maintenance of Schwann cells and the myelin sheath require endosomal sorting (Trapp et al., 2004;Simons and Trotter, 2007), we decided to follow the SH3TC2/Rab11 interaction further.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Trapp et al., 2004;Simons and Trotter, 2007

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    Myelinating Schwann cells have at least five distinct membrane domains that differ in their membrane lipid and protein composition.

    “Myelinating Schwann cells have at least five distinct membrane domains (Arroyo and Scherer, 2000;Simons and Trotter, 2007) that differ in their membrane lipid and protein composition.”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites Arroyo and Scherer, 2000 source
    • cites Simons and Trotter, 2007 source
  • Probably not a substantial claim. The paper’s conclusions may not depend on it.

    Premisecitation

    Sorting in the trans-Golgi network partitions myelin proteins into separate transport vesicles that are targeted to distinct Schwann cell compartments.

    “Sorting in the trans-Golgi network partitions myelin proteins into separate transport vesicles (Trapp et al., 1995) that are targeted to distinct Schwann cell compartments.”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Trapp et al., 1995 source
25 of 25
  • The paper relies on this without support.

    No proteins interacting with SH3TC2 had been identified before this study.

    “However, no protein binding to SH3TC2 has been identified so far.”
  • The paper relies on this without support.

    The physiological function of SH3TC2 had not yet been identified, and the pathomechanism causing impaired PNS myelination in CMT4C patients and Sh3tc2 knockout mice remained unclear.

    “However, as the physiological function of the gene product, SH3TC2, has not yet been identified, the pathomechanism causing impaired PNS myelination in CMT4C patients and Sh3tc2 knockout mice has so far remained unclear.”
  • The paper relies on this without support.

    There were no published data on Rab11 expression in the PNS.

    “As there were no published data on Rab11 expression in the PNS, we studied Rab11a protein levels in Schwann cell lines, primary rat Schwann cell cultures and sciatic nerves of rat and mouse by western blotting (Fig. 3A).”
  • The paper relies on this without support.

    The putative protein-binding motifs in SH3TC2 did not allow prediction of a bona fide interaction partner.

    “as the putative protein binding motifs in SH3TC2 did not allow prediction of a bona fide interaction partner, we decided to perform an unbiased screen for interacting proteins.”
  • The paper relies on this without support.

    Rab proteins cycle between inactive GDP-bound and active GTP-bound conformations.

    “Like all GTPases, Rab proteins cycle between an inactive (guanosine diphosphatebound) and an active (GTP-bound) conformation.”
  • The paper relies on this without support.

    The GTP-bound activated form of a Rab GTPase associates with effector molecules through which it carries out its functions.

    “The GTP-bound, activated form of the GTPase associates with effector molecules through which it carries out its functions.”
  • The authors state this as an assumption.

    Endocytic recycling may assist morphogenesis of the myelin sheath by sorting and redirecting myelin components.

    “Assuming that endocytic recycling may assist morphogenesis of the myelin sheath by sorting and redirecting myelin components”
  • The paper relies on this without support.

    Molecular pathways regulating vesicular transport during myelination have remained largely unknown.

    “However, molecular pathways regulating vesicular transport during myelination have remained largely unknown.”
8 of 8

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.

  • Myelination duration differs between methods and Figure 6

    Minor

    The methods say the Schwann cell-neuron co-cultures were induced to myelinate for 10 consecutive days, but the Figure 6 caption describes them after 12 days of myelination.

1 of 1

Citations

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Metadata

Authors
Stendel, C., Roos, A., Kleine, H., Arnaud, E., Özçelik, M., Sidiropoulos, P. N. M., Zenker, J., Schüpfer, F., Lehmann, U., Sobota, R. M., Litchfield, D. W., Lüscher, B., Chrast, R., Suter, U., & Senderek, J.
Affiliations
  • ETH Zurich (CH)
  • RWTH Aachen University (DE)
  • Centre Hospitalier Universitaire Vaudois (CH)
  • University of Southern Denmark (DK)
  • Western University (CA)
Venue
Brain
Published
2010-07-24
Volume
133
Issue
8
Pages
2462-2474
ISSN
  • 0006-8950 (ISSN-L)
  • 1460-2156
OpenAlex
W2150495344
Cited by
102
References
53
Citations by year
2026: 1 · 2025: 6 · 2024: 8 · 2023: 5 · 2022: 6 · 2021: 5 · 2020: 6 · 2019: 3 · 2018: 8 · 2017: 6 · 2016: 8 · 2015: 3 · 2014: 10 · 2013: 8 · 2012: 14
FWCI
3.01
Type
journal article
Language
en
Open access
Locations
  • Brain (publishedVersion)
  • PubMed (publishedVersion)
  • SERVAL (Université de Lausanne) (publishedVersion, other-oa)
  • reroDoc Digital Library (submittedVersion)
  • IRIS (submittedVersion)
  • Scholarship@Western (Western University) (submittedVersion)
  • RWTH Publications (RWTH Aachen) (submittedVersion)
  • Repository for Publications and Research Data (ETH Zurich) (submittedVersion, other-oa)
  • ETH Zürich Research Collection
Funders
  • National Science Foundation
  • Vanderbilt University
  • Vanderbilt University Medical Center
  • University College Cork
  • Deutsche Forschungsgemeinschaft
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
  • RWTH Aachen University
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Hereditary Neurological Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Health Sciences › Medicine › Clinical Neurology › Peripheral Neuropathies and Disorders
Keywords
SH3TC2, Charcot-Marie-Tooth disease, peripheral nerve myelination, Schwann cells, Rab11, endosomal recycling, membrane trafficking, myelination
MeSH terms
rab11 GTP-Binding Proteins, Animals, Carrier Proteins, Cell Line, Chlorocebus aethiops, Charcot-Marie-Tooth Disease, Ganglia, Spinal, Humans, Mutation, Myelin Sheath, Peripheral Nerves, Endosomes, Schwann Cells, Sciatic Nerve, Mice, Knockout, COS Cells, rab GTP-Binding Proteins, Intracellular Signaling Peptides and Proteins, Mice, Rats

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 2026-11-10, under version 3 of the claim definition (model deepseek-v4.1-flash, prompt extract-v3).

A second model labelled each claim on 2026-11-10 (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