GO:0140941 histone H4K20me methyltransferase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0140941 describes the enzymatic activity that adds a second methyl group to histone H4 lysine 20 (H4K20me1 to H4K20me2), using S-adenosyl-L-methionine as the methyl donor.
• The principal enzyme responsible for this activity in mammals is SETD8 (also known as KMT5A, SET8, PR-Set7), a SET-domain methyltransferase.
• H4K20me2 is a chromatin mark that influences DNA damage repair, cell cycle progression, and transcription, and its dysregulation is linked to cancer and developmental disorders.
• SETD8-mediated H4K20 methylation is regulated by protein partners such as PWWP domain proteins, microRNAs (miR-192/215), and deubiquitinases like USP29.
• In fission yeast, H4K20 monomethylation (a prerequisite for H4K20me2) is coupled to transcription-dependent histone turnover, highlighting conserved roles in chromatin dynamics.
• Studying GO:0140941 requires tools such as knockout cell lines, point mutants, and knock-in reporters to dissect its catalytic and non-catalytic functions.
Description
Histone H4 lysine 20 (H4K20) methylation is a critical epigenetic mark that exists in three states: mono- (me1), di- (me2), and trimethylation (me3). The di-methylated form, H4K20me2, is the most abundant and is generated by the enzymatic activity described by GO:0140941, histone H4K20me methyltransferase activity. This activity catalyzes the transfer of a methyl group from S-adenosyl-L-methionine to the monomethylated lysine 20 of histone H4, producing H4K20me2 and S-adenosyl-L-homocysteine. The primary enzyme responsible for this reaction in mammals is SETD8 (KMT5A), a SET-domain-containing methyltransferase. Understanding GO:0140941 is essential because H4K20me2 serves as a docking site for proteins involved in DNA damage response, such as 53BP1, and plays roles in transcriptional regulation and cell cycle control. Dysregulation of this activity has been implicated in oncogenesis, developmental abnormalities, and placental insufficiency. Researchers studying chromatin biology, cancer epigenetics, and developmental disorders therefore require robust experimental models to investigate the function and regulation of this enzymatic activity.
histone H4K20me methyltransferase activity At A Glance
| GO ID | GO:0140941 |
|---|---|
| GO term | histone H4K20me methyltransferase activity |
| Ontology | molecular_function |
| Synonym | histone H4-K20 dimethylation; histone H4K20 dimethylation; histone H4K20me methylase activity; histone H4 methyl lysine(20) N-methyltransferase activity (H4-K20 specific) |
| Major function | Catalyzes the addition of a methyl group to monomethylated histone H4 lysine 20, producing H4K20me2 |
| Substrate | N(6)-methyl-L-lysyl(20)-[histone H4] (H4K20me1) |
| Cofactor | S-adenosyl-L-methionine (SAM) |
| Product | H4K20me2 and S-adenosyl-L-homocysteine |
| Major enzyme | SETD8 (KMT5A, SET8, PR-Set7) |
What Is GO:0140941?
GO:0140941, histone H4K20me methyltransferase activity, is a molecular function defined as the catalysis of the reaction: N(6)-methyl-L-lysyl(20)-[histone H4] + S-adenosyl-L-methionine = H+ + N(6),N(6)-dimethyl-L-lysyl(20)-[histone H4] + S-adenosyl-L-homocysteine. In simpler terms, it is the enzyme activity that adds a second methyl group to the already monomethylated lysine 20 residue of histone H4, converting H4K20me1 to H4K20me2. This activity is specific for the H4K20 position and uses S-adenosyl-L-methionine as the methyl donor. The official synonyms include histone H4-K20 dimethylation, histone H4K20 dimethylation, histone H4K20me methylase activity, and histone H4 methyl lysine(20) N-methyltransferase activity (H4-K20 specific).
Why Is histone H4K20me methyltransferase activity Important in Cell Biology?
GO:0140941 is important because the H4K20me2 mark it generates is a central hub for chromatin regulation. H4K20me2 recruits effector proteins such as 53BP1 to sites of DNA damage, thereby influencing DNA repair pathway choice and genomic stability. It also contributes to transcriptional control, with studies showing that SETD8-mediated H4K20 monomethylation (a prerequisite for dimethylation) activates Wnt target genes. In development, proper H4K20 methylation is critical for placental function and lung maturation, as demonstrated in rat models of uteroplacental insufficiency. Moreover, dysregulation of SETD8 and H4K20me2 has been observed in various cancers, including gastric carcinoma, where it induces oncogene-induced senescence via p53-dependent DNA damage. Thus, understanding this activity provides insights into fundamental chromatin biology and offers potential therapeutic targets for cancer and developmental disorders.
• H4K20me2 is a docking site for 53BP1, a key factor in DNA double-strand break repair.
• SETD8-mediated H4K20 methylation regulates cell cycle progression and genomic stability.
• The mark is involved in transcriptional activation of Wnt target genes.
• Dysregulation of SETD8 and H4K20me2 is linked to gastric carcinoma and oncogene-induced senescence.
• Uteroplacental insufficiency alters the PPARγ-KMT5A axis, affecting H4K20 methylation in the placenta.
• Reduced SETD8 expression in neonatal lung is associated with intrauterine growth restriction.
• H4K20 methylation is conserved in fission yeast and marks transcription-dependent histone turnover.
• The activity is regulated by protein partners like PWWP domain proteins and microRNAs.
• USP29 deubiquitinates SETD8, controlling DNA damage-induced H4K20 monomethylation.
• Endothelial HBEGF promotes beta cell proliferation via the EGFR-Kmt5a-H4K20me pathway.
Molecular Mechanism of histone H4K20me methyltransferase activity
Substrate recognition and binding
In simple terms: The enzyme must first find and bind to the histone H4 protein that already has one methyl group on lysine 20.
The methyltransferase SETD8 (KMT5A) specifically recognizes histone H4 monomethylated at lysine 20 (H4K20me1). This recognition is mediated by the SET domain and adjacent regions. Studies have shown that PWWP domain proteins can regulate Set9-mediated H4K20 methylation, indicating that accessory factors influence substrate binding and catalytic efficiency. In fission yeast, H4K20 monomethylation is coupled to transcription-dependent histone turnover, suggesting that substrate availability is linked to chromatin dynamics.
Catalytic transfer of the methyl group
In simple terms: The enzyme takes a methyl group from SAM and attaches it to the already-methylated lysine 20, making it dimethylated.
The catalytic mechanism involves the transfer of a methyl group from S-adenosyl-L-methionine (SAM) to the epsilon-amino group of monomethylated lysine 20 on histone H4. This reaction produces H4K20me2 and S-adenosyl-L-homocysteine (SAH). The SET domain of SETD8 contains the catalytic residues that facilitate this transfer. The activity is specific for the H4K20 position and requires the monomethylated substrate; unmethylated H4K20 is not a substrate for this particular activity.
Regulation by protein partners and post-translational modifications
In simple terms: Other proteins can help or hinder the enzyme, and chemical tags on the enzyme itself can change its activity.
SETD8 activity is regulated by interaction with PWWP domain proteins, which can modulate its methyltransferase activity on H4K20. Additionally, the deubiquitinase USP29 deubiquitinates SETD8, thereby regulating DNA damage-induced H4K20 monomethylation and subsequent 53BP1 focus formation. MicroRNAs such as miR-192/215 can target SETD8 mRNA, reducing its expression and affecting H4K20 methylation levels. These regulatory layers ensure that H4K20me2 levels are tightly controlled in response to cellular signals.
Biological consequences of H4K20me2 deposition
In simple terms: Once the mark is placed, it acts like a landing pad for other proteins that carry out important jobs like DNA repair.
The H4K20me2 mark generated by GO:0140941 serves as a binding site for proteins containing tudor domains, such as 53BP1. This recruitment is essential for the DNA damage response, particularly for non-homologous end joining. Studies have shown that USP29-mediated regulation of SETD8 and H4K20 monomethylation affects 53BP1 focus formation after DNA damage. Furthermore, H4K20 methylation is involved in transcriptional regulation; for example, SET8-mediated H4K20 monomethylation activates Wnt target genes. In pancreatic beta cells, the EGFR-Kmt5a-H4K20me pathway promotes proliferation, linking this activity to tissue regeneration.
Key Genes Involved in GO:0140941 histone H4K20me methyltransferase activity
The following genes and proteins are directly involved in or regulate the histone H4K20me methyltransferase activity described by GO:0140941.
| Gene | Major Role | Research Relevance |
|---|---|---|
| SETD8 (KMT5A) | Primary methyltransferase that catalyzes H4K20me1 to H4K20me2 | Central enzyme for GO:0140941; knockout causes loss of H4K20me2 and genomic instability |
| SET9 (Set9) | Histone methyltransferase that monomethylates H4K20 in fission yeast and possibly higher organisms | Model for studying regulation of H4K20 methylation by PWWP domain proteins |
| PPARγ | Transcription factor that regulates KMT5A expression in placenta | Linked to uteroplacental insufficiency and H4K20 methylation changes |
| USP29 | Deubiquitinase that stabilizes SETD8 | Regulates DNA damage-induced H4K20 monomethylation and 53BP1 focus formation |
| miR-192/215 | MicroRNAs that target SETD8 mRNA | Regulate SETD8 expression and oncogene-induced senescence in gastric carcinoma |
| 53BP1 | Tudor domain protein that binds H4K20me2 | Key effector in DNA double-strand break repair; focus formation depends on H4K20me2 |
| HBEGF | Endothelial-derived growth factor that signals via EGFR to regulate Kmt5a | Promotes pancreatic beta cell proliferation through EGFR-Kmt5a-H4K20me pathway |
| EGFR | Receptor tyrosine kinase upstream of Kmt5a | Mediates HBEGF-induced beta cell proliferation |
| KMT5A (Kmt5a) | Rodent ortholog of SETD8 | Studied in rat models of uteroplacental insufficiency and lung development |
| DHA | Docosahexaenoic acid, a dietary supplement | Ameliorates IUGR-induced decrease in PPARγ and SETD8 expression in neonatal rat lung |
| PWWP domain proteins | Proteins that bind methylated histones and regulate Set9 | Modulate H4K20 methylation by Set9 |
| p53 | Tumor suppressor activated by DNA damage | Mediates oncogene-induced senescence downstream of SETD8 dysregulation |
| Wnt | Signaling pathway activated by H4K20 monomethylation | SET8-mediated H4K20me1 activates Wnt target genes |
| Histone H4 | Substrate for the methyltransferase | The target residue K20 is the site of methylation |
| S-adenosyl-L-methionine (SAM) | Methyl donor cofactor | Required for the catalytic reaction |
| S-adenosyl-L-homocysteine (SAH) | Byproduct of the methylation reaction | Feedback inhibitor of methyltransferases |
| Set9 (fission yeast) | H4K20 monomethyltransferase | Marks transcription-dependent histone turnover |
How Is histone H4K20me methyltransferase activity Regulated?
The activity of histone H4K20me methyltransferase (GO:0140941) is regulated at multiple levels. Transcriptional regulation of SETD8 is influenced by transcription factors such as PPARγ, which upregulates KMT5A in the placenta under conditions of uteroplacental insufficiency. Post-transcriptional regulation occurs via microRNAs; miR-192/215 directly target SETD8 mRNA, reducing its levels and affecting H4K20 methylation. Protein stability is controlled by ubiquitination and deubiquitination; USP29 deubiquitinates SETD8, protecting it from degradation and thereby promoting H4K20 monomethylation and 53BP1 focus formation after DNA damage. Additionally, interaction with PWWP domain proteins can modulate Set9-mediated H4K20 methylation, suggesting that accessory factors fine-tune the activity. In fission yeast, H4K20 monomethylation is coupled to transcription-dependent histone turnover, indicating that chromatin dynamics and transcription influence the availability of substrate for further methylation. These regulatory mechanisms ensure that H4K20me2 levels are appropriately maintained in response to developmental and environmental cues.
histone H4K20me methyltransferase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SETD8 (KMT5A) | Gastric carcinoma, oncogene-induced senescence | Knockout or knockdown in gastric cancer cell lines; point mutants to dissect catalytic activity |
| KMT5A (Kmt5a) | Uteroplacental insufficiency, placental dysfunction | Rat models of uteroplacental insufficiency; overexpression or knockout in trophoblast cells |
| SETD8 (SETD8) | Intrauterine growth restriction, lung developmental defects | Neonatal rat lung models; DHA supplementation studies; knockout in lung epithelial cells |
| USP29 | DNA damage response, cancer predisposition | Knockout cell lines to study 53BP1 focus formation; knock-in of deubiquitination-deficient mutants |
| HBEGF/EGFR | Diabetes, beta cell regeneration | Mouse models of beta cell proliferation; knockout of Kmt5a in beta cells |
Cancer and genomic instability
Dysregulation of SETD8 and H4K20 methylation is implicated in cancer. In gastric carcinoma cells, SETD8 is regulated by miR-192/215 and induces oncogene-induced senescence via a p53-dependent DNA damage response. Loss of proper H4K20me2 leads to defective 53BP1 recruitment and impaired DNA repair, contributing to genomic instability. Therefore, targeting GO:0140941 may offer therapeutic strategies for cancers with aberrant H4K20 methylation.
Developmental disorders and placental insufficiency
Uteroplacental insufficiency with hypoxia upregulates the PPARγ-KMT5A axis in the rat placenta, altering H4K20 methylation patterns. In neonatal rat lung, intrauterine growth restriction decreases PPARγ and SETD8 expression, effects that are ameliorated by maternal DHA supplementation. These findings suggest that H4K20 methylation is critical for normal development and that its disruption may contribute to developmental disorders.
Metabolic and regenerative processes
In pancreatic beta cells, endothelial-derived HBEGF promotes proliferation via the EGFR-Kmt5a-H4K20me pathway. This links H4K20 methylation to metabolic tissue regeneration and suggests that modulating this activity could influence beta cell mass in diabetes.
From histone H4K20me methyltransferase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| What is the catalytic role of SETD8 in H4K20me2 deposition? | SETD8 knockout cell lines (e.g., HEK293T, HeLa) and rescue with wild-type or catalytically dead SETD8 |
| How does H4K20me2 recruit 53BP1 to DNA damage sites? | Knock-in of H4K20A or H4K20R mutants to prevent methylation; imaging of 53BP1 foci |
| Does SETD8 regulate Wnt target genes? | Overexpression of SETD8 or catalytically inactive mutant in Wnt-responsive cells; luciferase reporter assays |
| What is the role of Kmt5a in beta cell proliferation? | Beta cell-specific Kmt5a knockout mice; overexpression of Kmt5a in pancreatic islets |
| How does USP29 regulate SETD8 stability? | USP29 knockout cells; point mutations in SETD8 ubiquitination sites; proteasome inhibitors |
| What are the effects of miR-192/215 on SETD8 expression? | miR-192/215 mimics or inhibitors in gastric cancer cells; 3'UTR reporter assays |
How to Study the histone H4K20me methyltransferase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| ChIP-seq | Genome-wide distribution of H4K20me2 | Mapping chromatin marks at DNA damage sites and promoters |
| Western blot | Global levels of H4K20me2 | Validating knockout or overexpression of SETD8 |
| Immunofluorescence | Co-localization of H4K20me2 and 53BP1 foci | Assessing DNA damage response |
| Mass spectrometry | Site-specific histone modifications | Quantifying H4K20me2 in different cell states |
| CRISPR screen | Genes affecting H4K20me2 or cell fitness | Identifying regulators of GO:0140941 |
| qRT-PCR | mRNA levels of SETD8 and regulators | Measuring effects of miR-192/215 or DHA |
| Luciferase reporter | Transcriptional activity of Wnt targets | Linking H4K20 methylation to gene expression |
| Proximity ligation assay | Protein-protein interactions | Detecting SETD8-USP29 interaction |
Chromatin immunoprecipitation (ChIP) and ChIP-seq
ChIP using antibodies specific for H4K20me2 can map the genomic distribution of this mark. ChIP-seq provides genome-wide profiles, revealing enrichment at DNA damage sites, promoters, and heterochromatic regions. This method is essential to understand how GO:0140941 activity shapes chromatin landscapes.
Western blotting and immunofluorescence
Western blotting with anti-H4K20me2 antibodies quantifies global levels of the mark, while immunofluorescence can visualize H4K20me2 foci and 53BP1 co-localization at DNA damage sites. These techniques are widely used to assess changes in methyltransferase activity upon genetic or pharmacological perturbations.
Mass spectrometry-based proteomics
Mass spectrometry can identify and quantify histone modifications, including H4K20me2, in a site-specific manner. This approach is valuable for confirming the specific activity of SETD8 and for discovering off-target effects in knockout or mutant models.
CRISPR-based genetic screens
Genome-wide CRISPR knockout or activation screens can identify genes that regulate H4K20me2 levels or that are synthetically lethal with SETD8 loss. Such screens are powerful for uncovering novel components of the GO:0140941 pathway and potential therapeutic targets.
How CRISPR Can Be Used to Study GO:0140941 histone H4K20me methyltransferase activity
Knockout
CRISPR knockout of SETD8 (KMT5A) eliminates the histone H4K20me methyltransferase activity, leading to loss of H4K20me2 and accumulation of H4K20me1. This model is used to study the consequences of H4K20me2 depletion on DNA repair, cell cycle, and transcription. Knockout of USP29, a regulator, also affects H4K20 monomethylation and 53BP1 focus formation.
Point Mutation
Point mutations in the SET domain of SETD8 can abolish catalytic activity while preserving protein structure, allowing separation of catalytic and non-catalytic functions. Such mutants are valuable for dissecting the specific contribution of GO:0140941 to cellular phenotypes.
Knock-in
Knock-in of histone H4 mutants (e.g., H4K20A or H4K20R) prevents methylation at lysine 20, providing a powerful tool to study the biological significance of H4K20me2 without altering the methyltransferase itself. This approach has been used to demonstrate the requirement of H4K20me2 for 53BP1 recruitment.
Overexpression
Overexpression of wild-type SETD8 or its catalytically inactive mutant can elevate or dominantly inhibit H4K20 methylation. Overexpression models are used to investigate the effects of increased H4K20me2 on gene expression, such as Wnt target gene activation, and on beta cell proliferation via the EGFR-Kmt5a-H4K20me pathway.
How EDITGENE Supports histone H4K20me methyltransferase activity Research
Researchers studying histone H4K20me methyltransferase activity-related genes often need to determine whether a candidate gene is causally involved in the deposition or regulation of H4K20me2. EDITGENE provides a comprehensive suite of CRISPR-based services to generate precisely engineered cell models, enabling rigorous functional studies of GO:0140941 and its associated pathways.
Contact EDITGENE today to design your custom CRISPR model for histone H4K20me methyltransferase activity research.
Frequently Asked Questions About histone H4K20me methyltransferase activity
What is histone H4K20me methyltransferase activity?
It is the enzymatic activity (GO:0140941) that adds a second methyl group to histone H4 lysine 20, converting H4K20me1 to H4K20me2, using S-adenosyl-L-methionine as the methyl donor.
What genes are involved in histone H4K20me methyltransferase activity?
The primary gene is SETD8 (also known as KMT5A, SET8, PR-Set7). Regulators include USP29, miR-192/215, PPARγ, and PWWP domain proteins.
Which enzyme catalyzes H4K20 dimethylation?
SETD8 (KMT5A) is the main enzyme responsible for H4K20me2 in mammals.
What is the role of H4K20me2 in DNA damage repair?
H4K20me2 recruits 53BP1 to DNA double-strand breaks, facilitating non-homologous end joining and maintaining genomic stability.
How is SETD8 regulated?
SETD8 is regulated transcriptionally by PPARγ, post-transcriptionally by miR-192/215, and at the protein level by USP29-mediated deubiquitination.
What diseases are associated with H4K20 methylation?
Dysregulation is linked to gastric carcinoma, uteroplacental insufficiency, intrauterine growth restriction, and impaired beta cell proliferation.
What model systems are used to study H4K20me2?
Common models include SETD8 knockout cell lines, histone H4K20A/R knock-in cells, and overexpression of wild-type or mutant SETD8.
How can I measure H4K20me2 levels?
Techniques include Western blotting, immunofluorescence, ChIP-seq, and mass spectrometry with modification-specific antibodies.
Is H4K20 methylation conserved across species?
Yes, H4K20 methylation is conserved from yeast to humans. In fission yeast, Set9-mediated H4K20 monomethylation marks transcription-dependent histone turnover.
What CRISPR services are available for studying H4K20 methylation?
EDITGENE offers knockout, point mutation, knock-in, overexpression, and CRISPR library screening services for genes involved in H4K20 methylation.
Conclusion
GO:0140941, histone H4K20me methyltransferase activity, is a fundamental chromatin-modifying activity that generates H4K20me2, a mark critical for DNA repair, transcription, and development. The primary enzyme SETD8 and its regulators are implicated in cancer, developmental disorders, and metabolic processes. Understanding this activity requires robust experimental models, and CRISPR-based approaches offer precise tools to dissect its functions. EDITGENE provides comprehensive services to support researchers in this endeavor, from knockout and knock-in models to library screening and bioinformatics.
References
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- 3. Joss-Moore LA et al.. 2010. IUGR decreases PPARγ and SETD8 Expression in neonatal rat lung and these effects are ameliorated by maternal DHA supplementation.. Early Hum Dev 86(12):785-91 PMID: 20869820
- 4. Wang Y et al.. 2009. Regulation of Set9-mediated H4K20 methylation by a PWWP domain protein.. Mol Cell 33(4):428-37 PMID: 19250904
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- 6. Li Z et al.. 2011. Histone H4 Lys 20 monomethylation by histone methylase SET8 mediates Wnt target gene activation.. Proc Natl Acad Sci U S A 108(8):3116-23 PMID: 21282610
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- 8. Yang H et al.. 2016. Both H4K20 mono-methylation and H3K56 acetylation mark transcription-dependent histone turnover in fission yeast.. Biochem Biophys Res Commun 476(4):515-521 PMID: 27268234
