Cited by 774Epigenetics and DNA MethylationGenomics and Chromatin DynamicsCancer-related gene regulation

The DOI matches its Crossref record; 55 of the 55 references it cites were found in a registry or an index; none of the 14 sources its claims cite is checked for support yet.

Intragenic DNA methylation prevents spurious transcription initiation

Open access

Abstract

In mammals, DNA methylation occurs mainly at CpG dinucleotides. Methylation of the promoter suppresses gene expression, but the functional role of gene-body DNA methylation in highly expressed genes has yet to be clarified. Here we show that, in mouse embryonic stem cells, Dnmt3b-dependent intragenic DNA methylation protects the gene body from spurious RNA polymerase II entry and cryptic transcription initiation. Using different genome-wide approaches, we demonstrate that this Dnmt3b function is dependent on its enzymatic activity and recruitment to the gene body by H3K36me3. Furthermore, the spurious transcripts can either be degraded by the RNA exosome complex or capped, polyadenylated, and delivered to the ribosome to produce aberrant proteins. Elongating RNA polymerase II therefore triggers an epigenetic crosstalk mechanism that involves SetD2, H3K36me3, Dnmt3b and DNA methylation to ensure the fidelity of gene transcription initiation, with implications for intragenic hypomethylation in cancer.

Overview

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TL;DR

Dnmt3b-mediated DNA methylation within gene bodies, recruited via H3K36me3, suppresses spurious intragenic RNA polymerase II entry and cryptic transcription initiation in mouse embryonic stem cells. The resulting aberrant transcripts can be degraded by the RNA exosome or capped, polyadenylated, exported, and ribosome-associated, with possible relevance to intragenic hypomethylation in cancer.

Key findings

  • Dnmt3b knockout reduced gene-body 5-methylcytosine, especially on exons and introns, and increased intragenic transcription: 1,445 genes (18% of genes with RPKM > 1) showed an intermediate-exon/first-exon log2 ratio above 1.
  • DECAP-seq identified 2,627 high-expression intragenic transcription start sites (RPM > 6) specific to Dnmt3b−/− cells, versus 780 shared and 936 WT-specific sites; Dnmt3b−/−-specific sites accounted for 2.76% of mapped reads, while shared sites accounted for 5.22%.
  • SetD2 silencing reduced H3K36me3 and Dnmt3b gene-body binding and produced 3,560 high-confidence intragenic TSSs, of which 2,759 were specific to the knockdown and more than 2,000 overlapped with Dnmt3b−/− sites.
  • Rescue experiments showed that wild-type Dnmt3b, but not the catalytically inactive V725G mutant or H3K36me3-binding mutants S277P and VW-RR, reduced the intermediate/first-exon ratio; cryptic RNAs were partly degraded by the RNA exosome, partly polyadenylated, and showed increased ribosome occupancy in intronic regions.

Methods

  • Mouse E14 embryonic stem cells were used, with two independent Dnmt3b knockout lines generated by TALEN targeting of exon 17; SetD2, Dis3, and Rrp6 were silenced by shRNA, and Dnmt3b rescue used wild-type or mutant constructs.
  • Genome-wide assays included ChIP-seq for Dnmt3b, RNA Pol II, H3K36me3, and other marks; whole-genome bisulfite sequencing; total, polyA+, and cytoplasmic RNA-seq; CAPIP-seq; DECAP-seq for single-base TSS mapping; and ART-seq ribosome profiling.
  • Analyses mapped reads to an E14-specific mm9 variant and used TopHat/Cuffdiff, Bowtie, BSMAP, MACS, and custom scripts, with significance assessed by Wilcoxon rank-sum, chi-square, hypergeometric, and correlation tests.

Limitations

  • The paper has no dedicated limitations section; it notes that alternative splicing and repetitive-element activation events in Dnmt3b−/− cells were sporadic, with only 4 of 2,563 genes showing intragenic alternative-promoter reactivation.
  • The cancer relevance is discussed as an implication rather than tested directly, and the production of aberrant proteins from cryptic transcripts is suggested by ribosome profiling rather than demonstrated.
  • Evident from the text: the work is restricted to mouse ESCs and relies heavily on knockout/knockdown and overexpression systems, so the findings may not generalize to other cell types or in vivo tumor settings.

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Integrity signals

Registry

Crossref · 10.1038/nature21373

Cites

55 of 55 references verified0 citation errors · 0 not checkable

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Verification

Claims the paper makes

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Show all 38 claims

  • It may state two separate claims as one. 32
  • Probably not a substantial claim. 11
  • The quote only partly states this claim. 1
40 of 40
  • The paper relies on this without support.

    The function of gene body DNA methylation in highly expressed genes has not yet been clarified.

    “while the functional role of gene body DNA methylation in highly expressed genes has yet to be clarified.”
    “the function of gene body DNA methylation has not yet been clarified.”
  • The paper relies on this without support.

    Silencing SetD2 in mammalian cells causes cryptic transcription initiation in a large fraction of active genes.

    “Silencing of SetD2 in mammalian cells leads to cryptic transcription initiation of a large fraction of active genes.”
  • The paper relies on this without support.

    Silencing Dis3 and Rrp6 impairs RNA exosome degradation of cryptic transcripts.

    “Silencing of the Dis3 and Rrp6 component of the RNA exosome complex did not show changes in the total number of intragenic TSSs (Extended Data Fig. 10e-g), but a significant increase of their expression level (Extended Data Fig. 10h-k).”
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Metadata

Authors
Neri, F., Rapelli, S., Krepelova, A., Incarnato, D., Parlato, C., Basile, G., Maldotti, M., Anselmi, F., & Oliviero, S.
Affiliations
  • Italian institute for Genomic Medicine (IT)
  • University of Turin (IT)
Corresponding author
  • Neri, Francesco
  • Oliviero, Salvatore
Venue
Nature
Published
2017-02-22
Volume
543
Issue
7643
Pages
72-77
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2589386142
Cited by
739
References
55
Citations by year
2026: 54 · 2025: 53 · 2024: 79 · 2023: 92 · 2022: 97 · 2021: 92 · 2020: 75 · 2019: 89 · 2018: 63 · 2017: 43
FWCI
30.15
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • Institutional Research Information System University of Turin (University of Turin) (submittedVersion, other-oa)
  • RePEc: Research Papers in Economics (submittedVersion)
  • University of Groningen research database (University of Groningen / Centre for Information Technology) (submittedVersion)
Funders
  • Associazione Italiana per la Ricerca sul Cancro (IG-2014)
  • Institute of Molecular and Cell Biology
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
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cancer-related gene regulation
Keywords
gene body methylation, DNMT3B, RNA polymerase II, H3K36me3, SETD2, RNA exosome, epigenetic crosstalk, mouse embryonic stem cells, CpG methylation
MeSH terms
Mouse Embryonic Stem Cells, DNA Methyltransferase 3B, Animals, Cell Line, DNA, DNA (Cytosine-5-)-Methyltransferases, Genes, Histones, Lysine, Neoplasms, Histone-Lysine N-Methyltransferase, Ribosomes, RNA Caps, RNA Polymerase II, RNA, Messenger, DNA Methylation, RNA Stability, Transcription Initiation Site, Polyadenylation, Epigenesis, Genetic, Mice, Transcription Initiation, Genetic

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