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Frequent lack of repressive capacity of promoter DNA methylation identified through genome-wide epigenomic manipulation

Ethan FordiD, Matthew GrimmeriD, Sabine StolzenburgiD, Ozren BogdanovićiD, Alex de MendozaiD, Peggy FarnhamiD, Pilar BlancafortiD, Ryan ListeriD

PDFDOI

Abstract summary

Claude Opus 5.5 · xhigh effort · 18 Oct 2026 · from the abstract · CC BY-NC-ND 4.0

Forcing DNA methylation onto thousands of human promoters with a zinc finger-DNMT3A fusion often fails to repress them, and the mark is quickly erased at H3K4me3-marked promoters.

The belief that CpG-rich promoter methylation silences transcription rests mainly on the inverse correlation between methylation and expression, not on direct manipulation of endogenous promoters. Depositing methylation at thousands of promoters and watching what happens tests that causal step, which matters for anyone building epigenome editing tools.

Key results

  1. SuggestedMethylation placed on endogenous promoters is often not enough to shut down their transcription.

    Reported across thousands of promoters targeted in human cells by an artificial zinc finger-DNMT3A fusion; the abstract gives no fraction of promoters repressed, no expression changes and no statistics. · Abstract

  2. SuggestedMethylation deposited at promoters carrying H3K4me3 does not persist once the targeting fusion protein is withdrawn.

    Described as rapid erasure after removal of the zinc finger-DNMT3A fusion; no timescale, methylation levels or promoter counts are given in the abstract. · Abstract

  3. SuggestedInduced DNA methylation and the active mark H3K4me3 can occupy the same promoter nucleosomes at the same time.

    Presented as a direct observation of co-occurrence; the abstract names no assay and reports no quantification of how often this happens. · Abstract

Methods, data and reproducibility

An artificial zinc finger fused to the DNA methyltransferase DNMT3A was used to deposit methylation at thousands of promoters in human cells. Transcription and histone modifications were then read out at the targeted promoters, along with how long the methylation survived after the fusion protein was removed.

  • promoters targeted for forced DNA methylation in human cells, assessed for transcription, histone modifications and methylation persistence · human · n = thousands of promoters
Methods & tools
artificial zinc finger-DNMT3A fusion protein
Reproducibility gaps
No accession, repository or data availability statement appears in the abstract.
Limitations (2)
  • Nothing is quantified: 'frequently insufficient' comes with no fraction of promoters, no expression effect sizes and no named assays for transcription or histone marks. · noted in this summary
  • Methylation is imposed artificially in unnamed human cells; whether methylation established developmentally behaves the same way is not addressed in the abstract. · noted in this summary

Read this if you do epigenome editing, or read promoter methylation as a silencing signal and want the forced-methylation test rather than another correlation.

Citations
45

Abstract

It is widely assumed that the addition of DNA methylation at CpG rich gene promoters silences gene transcription. However, this conclusion is largely drawn from the observation that promoter DNA methylation inversely correlates with gene expression. The effect of forced DNA methylation on endogenous promoters has yet to be comprehensively assessed. Here, we conducted artificial methylation of thousands of promoters in human cells using an artificial zinc finger-DNMT3A fusion protein, enabling assessment of the effect of forced DNA methylation upon transcription and histone modifications, and the durability of DNA methylation after the removal of the fusion protein. We find that DNA methylation is frequently insufficient to transcriptionally repress promoters. Furthermore, DNA methylation deposited at promoter regions associated with H3K4me3 is rapidly erased after removal of the zinc finger-DNMT3A fusion protein. Finally, we demonstrate that induced DNA methylation can exist simultaneously on promoter nucleosomes that possess the active histone modification H3K4me3. These findings suggest that promoter DNA methylation is not generally sufficient for transcriptional inactivation, with implications for the emerging field of epigenome engineering.

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