Cited by 131Epigenetics and DNA MethylationGenomics and Chromatin DynamicsMetal-Catalyzed Oxygenation Mechanisms

Tet Enzymes, Variants, and Differential Effects on Function

Open access
Melamed, Philippa, Yosefzon, Yahav, David, Cfir, Tsukerman, Anna, Pnueli, Lilach·2018·Frontiers in Cell and Developmental Biology

Abstract

Discovery of the ten-eleven translocation 1 (TET) methylcytosine dioxygenase family of enzymes, nearly 10 years ago, heralded a major breakthrough in understanding the epigenetic modifications of DNA. Initially described as catalyzing the oxidation of methyl cytosine (5mC) to hydroxymethyl cytosine (5hmC), it is now clear that these enzymes can also catalyze additional reactions leading to active DNA demethylation. The association of TET enzymes, as well as the 5hmC, with active regulatory regions of the genome has been studied extensively in embryonic stem cells, although these enzymes are expressed widely also in differentiated tissues. However TET1 and TET3 are found as various isoforms, as a result of utilizing alternative regulatory regions in distinct tissues. Some of these isoforms, like TET2, lack the CXXC domain which probably has major implications on their recruitment to specific loci in the genome, while in certain contexts TET1 is seen paradoxically to repress transcription. In this review we bring together these novel aspects of the differential regulation of these Tet isoforms and the likely consequences on their activity.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.3389/fcell.2018.00022

Cites

56 of 56 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

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 mammals, DNMT1 has been identified as de novo methyltransferase, whereas DNMT3A and DNMT3B are maintenance methyltransferases.

    “In mammals, DNMT1 has been identified as de novo methyltransferase, whereas DNMT3A and DNMT3B are maintenance methyltransferases.”

    From Revisiting Epigenetics Fundamentals and Its Biomedical Implications (2024) · cites this paper as [55]

    In “The TET enzymes, DNA hydroxymethylation, and demethylation” (page unavailable), the paper says DNMT1 is recruited to hemimethylated CpG during DNA replication, contrary to the claim’s assignment of DNMT1 to de novo methylation. Its References section (page unavailable) also identifies DNMT1 as a maintenance methyltransferase. The retrieved passages do not address the claimed roles of DNMT3A and DNMT3B. (LLM, conf=0.86)

    Checked by a reasoning model — may be wrong.

    Experimental — accuracy not yet measured
  • Methylation or demethylation in histones results in activation or inhibition of gene expression, respectively, by modulating DNA access to transcription factors through relaxation or compaction of chromatin structure.

    “Methylation or demethylation in histones results in the activation or inhibition of gene expression, respectively, by modulating DNA access to transcription factors through relaxation or compaction of the chromatin structure [55].”

    From Revisiting Epigenetics Fundamentals and Its Biomedical Implications (2024) · cites this paper as [55]

    In “Different effects of different isoforms?” (page unavailable), the paper links H3K27 histone methylation to repression of the Lhb gene, contrary to the claim that histone methylation activates expression. It also associates H3K36 methylation with active transcription, so it does not present methylation and demethylation as having the fixed, opposing effects claimed. (LLM, conf=0.84)

    Checked by a reasoning model — may be wrong.

    Experimental — accuracy not yet measured
  • TET enzymes (10-11 translocases), which are monooxygenases, mediate sequential oxidation of 5mC, and together with single-base excision, DNA repair machinery, and thymine DNA glycosylase (TDG) demethylases DNA.

    “On the other hand, a group of enzymes called TET (10–11 translocases), which are monooxygenases, mediate the sequential oxidation of 5mC, and together with single-base excision, DNA repair machinery, and thymine DNA, glycosylase (TDG) demethylases DNA [55].”

    From Revisiting Epigenetics Fundamentals and Its Biomedical Implications (2024) · cites this paper as [55]

    The section “The TET enzymes, DNA hydroxymethylation, and demethylation” describes sequential oxidation of 5mC, followed by TDG excision and base excision repair to complete active demethylation. However, it calls TET enzymes ten-eleven translocation methylcytosine dioxygenases, not “translocases” or monooxygenases. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • Histone methylation occurs in lysine and arginine residues in histone tails, where histone methyltransferases transfer a methyl group from SAM; demethylation is orchestrated by histone demethylases.

    “Histone methylation occurs in lysine and arginine residues in histone tails, where histone methyltransferases transfer to a methyl group from a donor, SAM; demethylation is orchestrated by histone demethylases.”

    From Revisiting Epigenetics Fundamentals and Its Biomedical Implications (2024) · cites this paper as [55]

    In “Different effects of different isoforms?” (page unavailable), the paper mentions H3K36 methyltransferases and their enzymatic activity, providing limited support for histone methylation by methyltransferases. It does not describe arginine methylation, SAM as the methyl donor, or histone demethylases; its demethylation discussion concerns DNA cytosine instead. (LLM, conf=0.78)

    Experimental — accuracy not yet measured
  • DNA methylation is regulated by DNA methyltransferases (DNMTs), which catalyze transfer of a methyl group from S-adenosylmethionine (SAM) to cytokines.

    “Given its reversible nature, DNA methylation is regulated by DNA methyltransferases (DNMTs), which catalyze the transfer of a methyl group from a donor group called S-adenosylmethionine (SAM) to cytokines.”

    From Revisiting Epigenetics Fundamentals and Its Biomedical Implications (2024) · cites this paper as [55]

    The section “The TET enzymes, DNA hydroxymethylation, and demethylation” describes DNMT1 acting at hemimethylated DNA sites, supporting the DNMT connection to methylation. It does not describe SAM as the methyl donor or the claimed transfer reaction. The paper discusses cytosines, not cytokines, as the DNA bases involved. (LLM, conf=0.82)

    Experimental — accuracy not yet measured

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Authors
Melamed, P., Yosefzon, Y., David, C., Tsukerman, A., & Pnueli, L.
Affiliations
Technion – Israel Institute of Technology (IL)
Corresponding author
Melamed, Philippa
Venue
Frontiers in Cell and Developmental Biology
Published
2018-03-05
Volume
6
Pages
22-22
ISSN
2296-634X (ISSN-L)
OpenAlex
W2790004746
Cited by
130
References
56
Citations by year
2026: 10 · 2025: 10 · 2024: 10 · 2023: 19 · 2022: 26 · 2021: 14 · 2020: 25 · 2019: 10 · 2018: 6
FWCI
1.35
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Cell and Developmental Biology (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Deutsche Forschungsgemeinschaft (BO 1743/7-1)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
Keywords
TET enzymes, 5-methylcytosine oxidation, 5-hydroxymethylcytosine, DNA demethylation, TET1, TET2, TET3, CXXC domain, alternative splicing, transcriptional repression, epigenetic regulation, embryonic stem cells

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.

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