GO:0043997 histone H4K12 acetyltransferase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0043997 defines the enzymatic activity that transfers an acetyl group from acetyl-CoA to lysine 12 of histone H4, a key chromatin modification.
• This activity is carried out by histone acetyltransferase (HAT) complexes, including Esa1 in yeast and Tip60 in mammals, which directly acetylate H4K12 [2,3].
• H4K12 acetylation is dynamically regulated during meiosis and post-ovulatory ageing, affecting oocyte quality and embryonic development [1,7].
• Dysregulation of H4K12 acetylation is linked to cognitive dysfunction in diabetes and to oncogenic programs in T-cell leukemia [6,8].
• Studying H4K12 acetyltransferase activity requires combining enzymatic assays, site-specific antibodies, and genetic models such as knockout or point-mutant cell lines [2,3,7].
• CRISPR-based knockout, knock-in, and overexpression models enable precise interrogation of HAT enzymes and their impact on H4K12 acetylation in disease contexts.
Description
Histone H4 lysine 12 acetylation (H4K12ac) is a conserved chromatin modification that influences transcription, DNA repair, and cell cycle progression. The enzyme responsible for adding this mark is classified under the Gene Ontology term GO:0043997, histone H4K12 acetyltransferase activity, which catalyzes the transfer of an acetyl group from acetyl-CoA to histone H4 at lysine 12. This activity is essential for maintaining acetylation homeostasis and is tightly regulated by opposing deacetylases and by developmental cues [3,7]. Researchers study GO:0043997 to understand how chromatin-modifying enzymes control gene expression programs in normal physiology and disease [2,6]. In oocytes, dynamic changes in H4K12 acetylation occur during meiotic maturation and after parthenogenetic activation, highlighting its role in reproductive biology. In neurons, the HAT Tip60 interacts with nuclear Arc to modify H4K12 acetylation, linking this activity to synaptic plasticity and cognitive function. In cancer, a NOTCH1-SIRT1-KAT7 axis regulates H4K12 acetylation and represents a therapeutically targetable vulnerability in T-cell leukemia. Thus, GO:0043997 is a focal point for understanding epigenetic regulation across diverse biological contexts.
histone H4K12 acetyltransferase activity At A Glance
| GO ID | GO:0043997 |
|---|---|
| GO term | histone H4K12 acetyltransferase activity |
| Ontology | molecular_function |
| Synonym | histone acetylase activity (H4-K12 specific); histone acetyltransferase activity (H4-K12 specific); histone H4-K12 acetyltransferase activity; histone lysine N-acetyltransferase activity (H4-K12 specific) |
| Major function | Catalyzes acetylation of histone H4 at lysine 12 using acetyl-CoA |
| Reaction | acetyl-CoA + histone H4 L-lysine (position 12) = CoA + histone H4 N6-acetyl-L-lysine (position 12) |
| Substrate | Histone H4 (lysine 12) |
| Cofactor | Acetyl-CoA |
| Product | CoA and acetylated histone H4 |
What Is GO:0043997?
GO:0043997, histone H4K12 acetyltransferase activity, is a molecular function defined as the catalysis of the reaction: acetyl-CoA + histone H4 L-lysine (position 12) = CoA + histone H4 N6-acetyl-L-lysine (position 12). In other words, it is the enzyme activity that specifically acetylates the 12th lysine residue of histone H4, using acetyl-CoA as the acetyl donor. This activity is a subset of histone acetyltransferase (HAT) activities and is distinguished by its strict substrate specificity for H4K12.
Why Is histone H4K12 acetyltransferase activity Important in Cell Biology?
GO:0043997 is important because H4K12 acetylation is a critical epigenetic mark that regulates chromatin structure and gene expression. Its dynamic regulation is essential for normal development, as shown by stage-specific changes during oocyte maturation. Disruption of H4K12 acetylation homeostasis contributes to cognitive dysfunction in diabetes and to leukemogenesis, making this activity a potential therapeutic target [6,8]. Understanding the enzymes that carry out this function, such as Tip60 and Esa1, provides insight into fundamental mechanisms of gene regulation and offers opportunities for drug discovery [2,3].
• Regulates chromatin accessibility and transcription by neutralizing positive charges on histone H4.
• Essential for meiotic maturation and post-ovulatory oocyte quality in vertebrates [1,7].
• Linked to synaptic plasticity and memory formation through Tip60-mediated H4K12 acetylation.
• Implicated in cognitive dysfunction associated with experimental diabetes.
• Contributes to oncogenic gene expression programs in T-cell leukemia via the NOTCH1-SIRT1-KAT7 axis.
• Serves as a model for studying HAT enzyme specificity and catalysis.
• Provides a readout for histone acetylation homeostasis in metabolic and hepatic disorders.
• Enables comparative studies of HAT complexes across species, from yeast to mammals [3,5].
What Happens During histone H4K12 acetyltransferase activity?
Substrate recognition and binding
In simple terms: The enzyme first grabs onto the histone H4 protein at the right spot.
Histone H4K12 acetyltransferase enzymes, such as Esa1 in yeast and Tip60 in mammals, recognize the N-terminal tail of histone H4 and bind specifically to lysine 12 [2,3]. This binding is facilitated by structural motifs within the catalytic domain that accommodate the histone substrate. In Saccharomyces cerevisiae, the essential Esa1 acetyltransferase collaborates with the Rpd3 deacetylase, and this interaction is mediated by H4K12 acetylation, indicating that substrate recognition is coupled to regulatory feedback.
Acetyl group transfer
In simple terms: The enzyme takes an acetyl group from acetyl-CoA and attaches it to lysine 12.
Once bound, the enzyme catalyzes the transfer of an acetyl group from acetyl-CoA to the epsilon-amino group of histone H4 lysine 12, forming N6-acetyl-L-lysine and releasing coenzyme A. This reaction is a classic acetyltransferase mechanism involving a conserved glutamate or other catalytic residue that deprotonates the lysine, enabling nucleophilic attack on the acetyl-CoA thioester. The activity is specific for H4K12, distinguishing it from other HAT activities that target different lysine residues.
Chromatin modification and downstream effects
In simple terms: The added acetyl mark loosens chromatin and helps turn genes on.
Acetylation of H4K12 neutralizes the positive charge of the lysine, weakening electrostatic interactions between histones and DNA, which can lead to a more open chromatin conformation. This mark serves as a docking site for bromodomain-containing proteins that recruit transcriptional machinery. In mouse oocytes, dynamic alterations in H4K12 acetylation occur during meiotic maturation and after parthenogenetic activation, suggesting roles in genome reprogramming. In neurons, Arc interacts with Tip60 to modify H4K12 acetylation, influencing gene expression required for synaptic plasticity.
Regulation by opposing enzymes
In simple terms: Other enzymes can remove the acetyl mark, keeping the process balanced.
The level of H4K12 acetylation is determined by the balance between acetyltransferases and deacetylases. In yeast, the Rpd3 deacetylase counteracts Esa1, and this collaboration is mediated by H4K12 acetylation itself, forming a regulatory loop. In T-cell leukemia, the NOTCH1-SIRT1-KAT7 axis regulates H4K12 acetylation, where SIRT1 (a deacetylase) and KAT7 (a HAT) modulate the mark to sustain oncogenic transcription. This dynamic equilibrium is crucial for normal cellular function and is disrupted in disease.
Key Genes Involved in GO:0043997 histone H4K12 acetyltransferase activity
The following genes encode enzymes or regulatory proteins directly implicated in histone H4K12 acetyltransferase activity or its regulation, as supported by published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| KAT5 (Tip60) | Catalytic subunit of a HAT complex that acetylates H4K12 | Interacts with nuclear Arc to modify H4K12 acetylation in neurons |
| ESA1 | Essential HAT in S. cerevisiae that acetylates H4K12 | Collaborates with Rpd3 deacetylase; model for HAT specificity |
| KAT7 (MYST2) | Histone acetyltransferase that can acetylate H4K12 | Part of NOTCH1-SIRT1-KAT7 axis in T-cell leukemia |
| SIRT1 | NAD+-dependent deacetylase that removes H4K12 acetylation | Regulates H4K12ac in leukemia and diabetes models [6,8] |
| RPD3 | Histone deacetylase in yeast | Antagonizes Esa1-mediated H4K12 acetylation |
| RTT109 | HAT for H3K56, but studies reveal specificity determinants | Provides insights into HAT chaperone control and specificity |
| ARC (Arg3.1) | Immediate early gene product that interacts with Tip60 | Links neuronal activity to H4K12 acetylation |
| NOTCH1 | Transcription factor driving T-cell leukemia | Upstream regulator of SIRT1-KAT7 axis affecting H4K12ac |
| HAT1 | Histone acetyltransferase for H4K5 and H4K12 | Potential context-dependent H4K12 acetyltransferase |
| GCN5 | HAT that can acetylate multiple H4 lysines | May contribute to H4K12 acetylation in some contexts |
| P300 | Transcriptional coactivator with HAT activity | Broad-specificity HAT that can modify H4K12 |
| CBP | HAT and transcriptional coactivator | Potential H4K12 acetyltransferase in specific promoters |
| MOF | HAT specific for H4K16 | Not directly H4K12, but informs HAT specificity studies |
| SAS2 | HAT for H4K16 in yeast | Model for understanding HAT substrate specificity |
| SAS3 | HAT for H3K14 and H3K23 | Related HAT for comparative studies |
| ELP3 | HAT subunit of elongator complex | May influence H4 acetylation patterns |
| HBO1 | HAT that acetylates H4K5, K8, K12 | Directly relevant to H4K12 acetylation in some cell types |
| KAT2A (GCN5L2) | HAT that can acetylate H4K12 | Involved in transcriptional regulation |
How Is histone H4K12 acetyltransferase activity Regulated?
Histone H4K12 acetyltransferase activity is regulated at multiple levels. In yeast, the essential Esa1 acetyltransferase and the Rpd3 deacetylase collaborate, with H4K12 acetylation itself mediating their interaction, creating a feedback loop that maintains acetylation homeostasis. In mammals, the activity of Tip60 is modulated by interaction with nuclear Arc, which is induced by neuronal activity, thereby linking synaptic signaling to H4K12 acetylation. In T-cell leukemia, the NOTCH1-SIRT1-KAT7 axis controls H4K12 acetylation; NOTCH1 upregulates KAT7 and SIRT1, and pharmacological inhibition of this axis alters H4K12ac levels. Additionally, metabolic states such as diabetes can disrupt histone acetylation homeostasis, leading to cognitive dysfunction, suggesting that systemic signals regulate H4K12 acetyltransferase activity. In oocytes, post-ovulatory ageing affects H4K12 acetylation patterns and histone acetyltransferase activity, indicating temporal regulation during meiosis.
histone H4K12 acetyltransferase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| KAT7 | T-cell leukemia | Knockout or knockdown in leukemia cell lines; xenograft models |
| SIRT1 | T-cell leukemia, diabetes | Overexpression or knockout in cell lines; metabolic models [6,8] |
| KAT5 (Tip60) | Neurodevelopmental and cognitive disorders | Neuron-specific knockout or knock-in mice |
| ESA1 | Fungal growth and stress response | Yeast knockout and point mutants |
| HAT1 | Hepatic steatosis | Liver-specific knockout or overexpression in mice |
H4K12 acetylation in T-cell leukemia
A therapeutically targetable NOTCH1-SIRT1-KAT7 axis regulates H4K12 acetylation in T-cell leukemia. NOTCH1 activation leads to increased expression of KAT7 (a HAT) and SIRT1 (a deacetylase), which together modulate H4K12 acetylation to sustain oncogenic transcription. Pharmacological inhibition of this axis reduces leukemia cell growth, highlighting H4K12 acetyltransferase activity as a potential therapeutic target.
Cognitive dysfunction in diabetes
Disruption of histone acetylation homeostasis triggers cognitive dysfunction in experimental diabetes. Studies show that diabetes alters H4K12 acetylation levels in the brain, and restoring acetylation balance may improve cognitive outcomes. This links H4K12 acetyltransferase activity to metabolic regulation of brain function.
Oocyte ageing and reproductive biology
In vitro post-ovulatory oocyte ageing in grass carp affects H4K12 acetylation patterns and histone acetyltransferase activity, suggesting that this epigenetic mark is sensitive to ageing and may impact oocyte quality and embryonic development. Similarly, dynamic alterations in H4K12 acetylation occur during meiotic maturation and after parthenogenetic activation in mouse oocytes, underscoring its role in reproductive processes.
Hepatic steatosis and metabolic regulation
Ethanol extract of Capsella bursa-pastoris improves hepatic steatosis through inhibition of histone acetyltransferase activity, indicating that HAT enzymes, potentially including those targeting H4K12, are involved in lipid metabolism and liver disease.
From histone H4K12 acetyltransferase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of KAT7 reduce H4K12 acetylation and leukemia growth? | KAT7 knockout in T-cell leukemia cell lines and xenografts |
| How does Tip60-mediated H4K12 acetylation affect synaptic plasticity? | Tip60 conditional knockout in mouse neurons |
| What is the role of Esa1 catalytic activity in yeast viability? | ESA1 point mutants (catalytic dead) in S. cerevisiae |
| Does H4K12 acetylation change during oocyte maturation? | Mouse oocytes with HAT overexpression or knockdown |
| Can restoring H4K12 acetylation improve cognitive function in diabetes? | Diabetic mouse models treated with HDAC inhibitors or HAT activators |
| Is H4K12 acetylation required for hepatic lipid metabolism? | Liver-specific HAT knockout or overexpression in mice |
How to Study the histone H4K12 acetyltransferase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| In vitro HAT assay | Enzymatic transfer of acetyl group to H4K12 | Characterizing enzyme kinetics and specificity |
| Western blot with anti-H4K12ac | Levels of H4K12 acetylation in cells | Monitoring changes during oocyte maturation or disease [1,7] |
| ChIP-qPCR/seq | Genomic localization of H4K12ac | Identifying target genes regulated by HATs |
| Immunofluorescence | Spatial distribution of H4K12ac | Studying neuronal or oocyte chromatin [2,7] |
| CRISPR knockout | Loss of HAT gene function | Determining requirement for H4K12 acetylation |
| CRISPR knock-in | Tagged or mutant HAT alleles | Tracking enzyme localization and dynamics |
| Overexpression | Increased HAT levels | Testing sufficiency for H4K12 acetylation |
| Library screening | Genome-wide identification of regulators | Discovering novel H4K12 acetyltransferases |
Enzymatic assays for HAT activity
Histone acetyltransferase activity can be measured using in vitro assays with recombinant enzymes, histone substrates, and radiolabeled or fluorescent acetyl-CoA. These assays allow determination of specific activity toward H4K12 using mutant histones or peptide substrates. Such methods have been used to characterize Esa1 and other HATs.
Site-specific antibodies and immunoblotting
Antibodies that specifically recognize acetylated H4K12 are widely used in Western blotting, immunoprecipitation, and immunofluorescence to quantify H4K12 acetylation levels in cells and tissues. This approach has been applied to study oocyte ageing and neuronal function [1,2,7].
Chromatin immunoprecipitation (ChIP)
ChIP with anti-H4K12ac antibodies followed by quantitative PCR or sequencing allows mapping of H4K12 acetylation across the genome. This method reveals how HAT enzymes and their recruitment affect gene expression programs in health and disease.
Genetic manipulation and CRISPR screens
CRISPR-Cas9 knockout, knock-in, and overexpression models enable loss- or gain-of-function studies of HAT genes. These approaches can identify genes required for H4K12 acetylation and uncover synthetic lethal interactions in cancer cells.
How CRISPR Can Be Used to Study GO:0043997 histone H4K12 acetyltransferase activity
Knockout
CRISPR-Cas9 knockout of HAT genes such as KAT7 or KAT5 can abolish H4K12 acetyltransferase activity, allowing researchers to test its requirement for cell proliferation, differentiation, and disease progression. For example, KAT7 knockout in T-cell leukemia cells reduces H4K12 acetylation and inhibits oncogenic growth.
Point Mutation
Introducing catalytic-dead point mutations in HAT genes (e.g., in the acetyl-CoA binding site) via CRISPR knock-in can separate enzymatic activity from scaffolding functions. Such models are valuable for dissecting the specific contribution of H4K12 acetylation to cellular phenotypes.
Knock-in
Knock-in of epitope tags (e.g., FLAG, HA) or fluorescent proteins into endogenous HAT loci enables real-time tracking of enzyme expression, localization, and interaction with chromatin. This approach can reveal dynamic regulation of H4K12 acetyltransferase activity during processes like meiosis.
Overexpression
CRISPR activation (CRISPRa) or transgenic overexpression of HAT genes can increase H4K12 acetylation levels, allowing gain-of-function studies. Overexpression of Tip60, for instance, enhances H4K12 acetylation and may affect synaptic gene expression.
How EDITGENE Supports histone H4K12 acetyltransferase activity Research
Researchers studying histone H4K12 acetyltransferase activity-related genes often need to determine whether a candidate gene is causally involved in H4K12 acetylation and its downstream phenotypes. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate this discovery process, from gene knockout to precise point mutations and library screening.
Contact EDITGENE today to design your custom CRISPR model for histone H4K12 acetyltransferase activity research.
Frequently Asked Questions About histone H4K12 acetyltransferase activity
What is histone H4K12 acetyltransferase activity?
It is the enzyme activity that adds an acetyl group to lysine 12 of histone H4, classified under GO:0043997.
What genes are involved in histone H4K12 acetyltransferase activity?
Key genes include KAT5 (Tip60), ESA1, KAT7, and SIRT1, which regulate H4K12 acetylation [2,3,8].
What is the GO ID for histone H4K12 acetyltransferase activity?
The Gene Ontology ID is GO:0043997.
How is H4K12 acetylation regulated?
It is balanced by acetyltransferases and deacetylases, such as Esa1 and Rpd3 in yeast, and KAT7 and SIRT1 in leukemia [3,8].
What diseases are associated with H4K12 acetylation?
Dysregulation is linked to T-cell leukemia, diabetes-related cognitive dysfunction, and oocyte ageing [1,6,8].
Which enzymes acetylate H4K12?
Tip60 (KAT5) and Esa1 are well-characterized H4K12 acetyltransferases [2,3].
How can I study H4K12 acetyltransferase activity in the lab?
Use in vitro HAT assays, site-specific antibodies, ChIP, and CRISPR knockout models [3,7,8].
What is the role of H4K12 acetylation in oocytes?
It changes dynamically during meiotic maturation and post-ovulatory ageing, affecting oocyte quality [1,7].
Is H4K12 acetylation important for memory?
Yes, Tip60-mediated H4K12 acetylation is involved in synaptic plasticity and cognitive function.
Can CRISPR be used to study H4K12 acetyltransferase activity?
Yes, CRISPR knockout, knock-in, and overexpression models allow precise manipulation of HAT genes.
Conclusion
Histone H4K12 acetyltransferase activity (GO:0043997) is a fundamental epigenetic mechanism that regulates chromatin structure and gene expression. Its dysregulation contributes to cancer, metabolic disorders, and reproductive ageing. Continued research using CRISPR-based models and advanced biochemical assays will further illuminate the roles of H4K12 acetylation in health and disease.
References
- 1. Samarin AM et al.. 2024. In vitro post-ovulatory oocyte ageing in grass carp Ctenopharyngodon idella affects H4K12 acetylation pattern and histone acetyltransferase activity.. Fish Physiol Biochem 50(5):2013-2024 PMID: 38019384
- 2. Wee CL et al.. 2014. Nuclear Arc Interacts with the Histone Acetyltransferase Tip60 to Modify H4K12 Acetylation(1,2,3).. eNeuro 1(1) PMID: 26464963
- 3. Chang CS et al.. 2009. Collaboration between the essential Esa1 acetyltransferase and the Rpd3 deacetylase is mediated by H4K12 histone acetylation in Saccharomyces cerevisiae.. Genetics 183(1):149-60 PMID: 19596907
- 4. Choi HK et al.. 2017. Ethanol Extract of Capsella bursa-pastoris Improves Hepatic Steatosis Through Inhibition of Histone Acetyltransferase Activity.. J Med Food 20(3):251-257 PMID: 28296592
- 5. Fillingham J et al.. 2008. Chaperone control of the activity and specificity of the histone H3 acetyltransferase Rtt109.. Mol Cell Biol 28(13):4342-53 PMID: 18458063
- 6. Aggarwal A et al.. 2023. Disruption of histone acetylation homeostasis triggers cognitive dysfunction in experimental diabetes.. Neurochem Int 170:105592 PMID: 37598859
- 7. Zhang Z et al.. 2020. Dynamic alterations in H4K12 acetylation during meiotic maturation and after parthenogenetic activation of mouse oocytes.. Zygote PMID: 32698925
- 8. Lancho O et al.. 2023. A Therapeutically Targetable NOTCH1-SIRT1-KAT7 Axis in T-cell Leukemia.. Blood Cancer Discov 4(1):12-33 PMID: 36322781
