ArticlebioRxiv : the preprint server for biology2026
KMT5C-H4K20me3 drives changes in epigenetic landscape independent of H3K9me3.
Article in bioRxiv : the preprint server for biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Authors and funding
8 authors.
Funding
Abstract
Histone H4 lysine 20 trimethylation (H4K20me3) is a histone modification that is critical in maintaining genome integrity. Dysregulation of H4K20me3 and KMT5C, the major methyltransferase for H4K20me3, occurs commonly in multiple types of cancer but the mechanisms surrounding how they contribute to shaping the epigenomic landscape remains unclear. Here, we show that KMT5C is involved in non-canonical deposition of H4K20me3, independent of H3K9me3, which was previously recognized as a prerequisite for H4K20me3. This novel subtype of H4K20me3 lacks canonical repressive epigenetic signatures and instead overlaps with multiple activating marks. These activating modifications likely contribute to the dynamic changes in transcript levels upon loss of H4K20me3. The mechanism involved in recruiting KMT5C to these loci is independent of HP1, the factor reported to be involved in recruitment of KMT5C to heterochromatin marked with H3K9me3. Instead, biochemical analyses revealed ZNF280C to be a novel interacting partner of KMT5C, with ZNF280C localizing specifically at H3K9me3-/H4K20me3+ sites. Together, these results suggest a novel, non-canonical function of KMT5C-H4K20me3 that protects vulnerable regions of the genome from uncontrolled expression.
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Registered trials
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