title: KAT8 Gene
KAT8 Gene
Overview
flowchart TD
KAT8["KAT8"] -->|"lactylates"| PCK2["PCK2"]
KAT8["KAT8"] -->|"associated with"| Tumor["Tumor"]
KAT8["KAT8"] -->|"associated with"| Parkinson["Parkinson"]
KAT8["KAT8"] -->|"implicated in"| Parkinson["Parkinson"]
KAT8["KAT8"] -->|"implicated in"| Neurodegeneration["Neurodegeneration"]
KAT8["KAT8"] -->|"regulates"| Heart_Failure["Heart Failure"]
KAT8["KAT8"] -->|"associated with"| RB1CC1["RB1CC1"]
KAT8["KAT8"] -->|"associated with"| SIRT1["SIRT1"]
KAT8["KAT8"] -->|"associated with"| LC3["LC3"]
KAT8["KAT8"] -->|"associated with"| SNAP29["SNAP29"]
KAT8["KAT8"] -->|"associated with"| RB1["RB1"]
KAT8["KAT8"] -->|"associated with"| KAT2B["KAT2B"]
KAT8["KAT8"] -->|"associated with"| KAT5["KAT5"]
KAT8["KAT8"] -->|"associated with"| WIPI2["WIPI2"]
style KAT8 fill:#4fc3f7,stroke:#333,color:#000
KAT8 (Lysine Acetyltransferase 8), also known as MOF (Males Absent On the First), MYST1, or YBL026W in yeast, is a crucial histone acetyltransferase that primarily acetylates histone H4 at lysine 16 (H4K16ac). This modification is essential for chromatin decompaction and transcriptional activation. KAT8 is highly conserved from yeast to humans and plays fundamental roles in epigenetic regulation, DNA damage response, and cellular homeostasis. Recent research has implicated KAT8 dysregulation in neurodegenerative diseases, making it a protein of interest in Alzheimer's disease (AD) and Parkinson's disease (PD) research["@klein2021"].
...title: KAT8 Gene
KAT8 Gene
Overview
Mermaid diagram (expand to render)
KAT8 (Lysine Acetyltransferase 8), also known as MOF (Males Absent On the First), MYST1, or YBL026W in yeast, is a crucial histone acetyltransferase that primarily acetylates histone H4 at lysine 16 (H4K16ac). This modification is essential for chromatin decompaction and transcriptional activation. KAT8 is highly conserved from yeast to humans and plays fundamental roles in epigenetic regulation, DNA damage response, and cellular homeostasis. Recent research has implicated KAT8 dysregulation in neurodegenerative diseases, making it a protein of interest in Alzheimer's disease (AD) and Parkinson's disease (PD) research["@klein2021"].
<div class="infobox infobox-gene">
| Property | Value |
|----------|-------|
| Gene Symbol | KAT8 |
| Gene Name | Lysine Acetyltransferase 8 |
| Aliases | MOF, MYST1, YBL026W, KAT8, MOZ |
| Chromosomal Location | 17q11.2 |
| NCBI Gene ID | [84144](https://www.ncbi.nlm.nih.gov/gene/84144) |
| OMIM | [609912](https://www.omim.org/entry/609912) |
| UniProt | [Q9H7Z6](https://www.uniprot.org/uniprot/Q9H7Z6) |
| Ensembl | [ENSG00000103510](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000103510) |
</div>
Function
KAT8/MOF is a highly conserved histone acetyltransferase belonging to the MYST family (MOZ, YBF2/SAS3, SAS2, TIP60). The enzyme catalyzes the transfer of acetyl groups from acetyl-CoA to lysine residues on histone tails, primarily H4K16, with additional activity at H4K5 and H4K8[@gupta2008].
Catalytic Activity
- Primary target: H4K16ac — the hallmark modification that prevents chromatin compaction
- Secondary targets: H4K5, H4K8, H2AK5, H2BK120
- Coenzyme: Acetyl-CoA — linking metabolic state to epigenetic regulation
- Structural features: MYST domain with zinc finger and chromodomain motifs
KAT8 functions within several multi-subunit complexes that direct its substrate specificity and genomic targeting:
- MSL (Male-Specific Lethal) complex: Involved in dosage compensation, primarily X-chromosome upregulation in Drosophila
- NSL (Non-Specific Lethal) complex: Targets euchromatic regions for global transcription activation
- SAGA complex: Participates in transcription elongation and DNA damage response[@gupta2008]
Non-Histone Substrates
Beyond histones, KAT8 acetylates:
- p53: Regulates tumor suppressor function and DNA damage response[@sykes2010]
- TAF4: Transcription factor acetylation
- [NF-κB](/entities/nf-kb) subunits: Modulates inflammatory gene expression
Physiological Roles
Chromatin Structure and Transcription
H4K16 acetylation by KAT8 is the quintessential "open chromatin" mark:
- Chromatin decompaction: H4K16ac prevents higher-order folding of nucleosome arrays into compact structures[@conaway2009]
- Transcription factor access: Open chromatin enables RNA polymerase II loading and transcription initiation
- Enhancer activation: H4K16ac at enhancers correlates with transcriptional competence
- DNA damage response: KAT8 is recruited to DNA damage sites and participates in repair[@kouzarides2007]
Cellular Homeostasis
KAT8 maintains cellular homeostasis through:
- Cell cycle regulation: Proper H4K16ac patterns are required for S-phase progression
- Metabolic coupling: Acetyl-CoA levels directly influence KAT8 activity, linking metabolism to epigenetics
- Cellular stress response: KAT8 is recruited to DNA damage sites and participates in repair
Development and Differentiation
Essential for normal development:
- Embryogenesis: Knockout mice show embryonic lethality
- Cell differentiation: KAT8 regulates lineage-specific gene expression programs
- Organogenesis: Critical for brain, heart, and hematopoietic development
Expression Pattern
Brain Expression
KAT8 is widely expressed throughout the central nervous system:
- Neuronal expression: High levels in cortical [neurons](/entities/neurons), hippocampal pyramidal cells, and cerebellar Purkinje cells
- Glial expression: Present in [astrocytes](/entities/astrocytes) and oligodendrocytes
- Subcellular localization: Nuclear, associated with chromatin
Regulation
KAT8 expression and activity are regulated by:
- Transcription factors: SP1, REST, and neuronal activity-dependent factors
- Post-translational modifications: Phosphorylation, sumoylation
- Cellular signaling: Calcium influx, neurotrophic factors
Disease Associations
Alzheimer's Disease
KAT8 has emerged as a significant player in AD pathogenesis:
- H4K16ac reduction: Studies show decreased H4K16ac in AD brain tissue and cellular models[@walker2015]
- [Amyloid-beta](/proteins/amyloid-beta) effects: Aβ treatment reduces KAT8 activity and H4K16ac levels
- Epigenetic therapy potential: KAT8 activators or [HDAC](/entities/hdac-enzymes) inhibitors restore H4K16ac and improve cognitive function in AD mouse models[@klein2021]
- [Tau](/proteins/tau) pathology connection: KAT8 dysfunction may synergize with tau pathology to drive neurodegeneration
- Gene expression dysregulation: KAT8 alterations contribute to AD-related gene expression changes
Parkinson's Disease
Evidence for KAT8 involvement in PD:
- [α-Synuclein](/proteins/alpha-synuclein) interaction: KAT8 activity modulated by α-synuclein aggregation
- DNA damage accumulation: KAT8 deficiency exacerbates DNA damage in dopaminergic neurons
- Neuroinflammation: KAT8 regulates inflammatory gene expression in [microglia](/cell-types/microglia-neuroinflammation)
Intellectual Disability and Rett Syndrome
- KAT8 mutations: Rare de novo mutations associated with neurodevelopmental disorders
- MECP2 interaction: KAT8 works cooperatively with MECP2 in transcriptional regulation
- Synaptic function: KAT8 regulates genes critical for synaptic plasticity
Cancer
KAT8 dysregulation is observed in multiple cancers:
- Breast cancer: Overexpression associated with poor prognosis
- Lung cancer: Tumor-promoting role through epigenetic reprogramming
- Colorectal cancer: Alters chromatin state to drive oncogenic gene expression
Therapeutic Implications
Epigenetic Drugs
KAT8 represents a potential therapeutic target:
- HDAC inhibitors: Restore H4K16ac levels by inhibiting deacetylases
- Small molecule activators: Direct KAT8 activators under development
- Combination therapy: HDAC inhibitors with standard AD treatments[@klein2021]
Biomarker Potential
- H4K16ac as biomarker: Peripheral blood cell H4K16ac levels may reflect brain epigenetic status
- Therapeutic monitoring: Tracking H4K16ac could indicate treatment response
Research Methods
Experimental Approaches
Key methods for studying KAT8:
- ChIP-seq: Genome-wide mapping of KAT8 binding and H4K16ac
- ATAC-seq: Assessing chromatin accessibility
- CRISPR-Cas9: Genetic knockouts and knock-ins
- Biochemical assays: Acetyltransferase activity measurements
- Mass spectrometry: Proteomic analysis of KAT8 complexes
Model Systems
- Cell lines: HEK293, SH-SY5Y neurons, primary neurons
- Animal models: KAT8 conditional knockout mice
- iPSC models: Neurons derived from patient iPSCs
Summary
KAT8/MOF is a critical histone H4K16 acetyltransferase essential for chromatin decompaction and transcription regulation. Beyond its fundamental roles in epigenetics, KAT8 has emerged as a significant player in neurodegenerative diseases, particularly Alzheimer's disease, where reduced H4K16ac contributes to transcriptional dysfunction and cognitive decline. The enzyme represents a promising therapeutic target for epigenetic-based interventions in neurodegeneration.
Brain Atlas Resources
- [KAT8 Expression - Allen Human Brain Atlas](https://human.brain-map.org/microarray/search/show?search_term=KAT8)
- [KAT8 Expression - Allen Mouse Brain Atlas](https://mouse.brain-map.org/gene/show?gene_id=KAT8)
- [BrainSpan - KAT8 Developmental Expression](https://www.brainspan.org/static/download.html)
See Also
- [Histone Acetyltransferases](/proteins/histone-acetyltransferases)
- [Chromatin Remodeling](/mechanisms/chromatin-remodeling)
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [Epigenetics in Neurodegeneration](/mechanisms/epigenetics-neurodegeneration)
- [DNA Damage Response in Neurodegeneration](/mechanisms/dna-damage-response-neurodegeneration)
- [Genes Index](/genes)
- [Proteins Index](/proteins)
External Links
- [NCBI Gene - KAT8](https://www.ncbi.nlm.nih.gov/gene/84144)
- [UniProt - KAT8](https://www.uniprot.org/uniprot/Q9H7Z6)
- [Ensembl - KAT8](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000103510)
- [UCSC Genome Browser - KAT8](https://genome.ucsc.edu/cgi-bin/hgTracks?db=hg38&position=chr17:26,931,521-26,947,980)
References
[Klein et al., H4K16 acetylation governs tau-induced neurodegeneration (2021) (2021)](https://pubmed.ncbi.nlm.nih.gov/34288654/)
[Gupta et al., The MOF chromodomain is not a DNA binding module (2008) (2008)](https://doi.org/10.1016/j.cell.2008.04.041)
[Sykes et al., Role of MYST histone acetyltransferases in p53 function (2010) (2010)](https://doi.org/10.1016/j.cell.2010.04.012)
[Unknown, Conaway & Conaway, Function and regulation of the Mediator complex (2009) (2009)](https://doi.org/10.1101/gad.1829209)
[Unknown, Kouzarides, Chromatin modifications and their function (2007) (2007)](https://doi.org/10.1016/j.cell.2007.06.016)
[Walker et al., Memory decline in aging is associated with epigenetic changes (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/25891239/)Pathway Diagram
The following diagram shows the key molecular relationships involving KAT8 Gene discovered through SciDEX knowledge graph analysis:
Mermaid diagram (expand to render)