DNMT3B Gene

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DNMT3B Gene

Introduction

Dnmt3B Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

<div class="infobox infobox-gene"> [@dna2005]
<table> [@epigenetic2009]
<tr><th colspan="2" style="background:#f0f0f0; text-align:center;">Gene Information</th></tr> [@epigenetic2014]
<tr><td>Gene Symbol</td><td>DNMT3B</td></tr> [@dna2017]
<tr><td>Full Name</td><td>DNA Methyltransferase 3 Beta</td></tr>
<tr><td>Chromosomal Location</td><td>20q11.21</td></tr>
<tr><td>NCBI Gene ID</td><td>1786</td></tr>
<tr><td>OMIM</td><td>602900</td></tr>
<tr><td>Ensembl ID</td><td>ENSG00000101735</td></tr>
<tr><td>UniProt ID</td><td><a href="https://www.uniprot.org/uniprot/O94769" target="_blank">O94769</a></td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/autism" style="color:#ef9a9a">Autism</a>, <a href="/wiki/carcinoma" style="color:#ef9a9a">Carcinoma</a>, <a href="/wiki/inflammation" style="color:#ef9a9a">Inflammation</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">24 edges</a></td>
</tr>
</table>
</div>

Overview

...

DNMT3B Gene

Introduction

Dnmt3B Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

Mermaid diagram (expand to render)

DNMT3B (DNA Methyltransferase 3 Beta) is a de novo DNA methyltransferase that establishes new [DNA methylation](/entities/dna-methylation) patterns during embryonic development and cellular differentiation. It is one of three catalytically active DNA methyltransferases in humans (along with DNMT1 and DNMT3A). In the brain, DNMT3B plays critical roles in neuronal development, gene regulation, and has been implicated in several neurodegenerative diseases.

Expression Pattern

DNMT3B exhibits developmental and cell-type specific expression:

Embryonic brain: High expression during neurogenesis
Adult brain: Lower expression, primarily in neural progenitor cells
[Neurons](/entities/neurons): Variable expression depending on brain region
[Astrocytes](/entities/astrocytes): Moderate expression

Regional distribution:

Subventricular zone (neural stem cells)
Hippocampal dentate gyrus
Cerebellar granule cell layer

Gene Structure

DNMT3B spans ~47 kb with:

23 coding exons
Multiple transcript variants
Alternative splicing

Normal Function

DNMT3B performs critical functions:

De Novo Methylation: Establishes new methyl marks on unmethylated DNA

Development: Essential for embryonic development

Gene Silencing: Contributes to transcriptional repression

X-chromosome Inactivation: Participates in X inactivation

The enzyme requires:

S-adenosylmethionine (SAM) as methyl donor
Zinc finger domains for DNA binding
Catalytic domain for methyltransferase activity

Molecular Mechanisms

Catalytic Activity

Adds methyl groups to cytosine residues (CpG dinucleotides)
Recognition of unmethylated DNA regions
Recruitment by transcription factors

Regulation

Transcription factor binding
Alternative splicing
Post-translational modifications

Role in Disease

| Disease | Role | Evidence |
|---------|------|----------|
| [Alzheimer's Disease](/diseases/alzheimers-disease) | Epigenetic dysregulation | Altered DNMT3B expression in AD brain |
| [ICF Syndrome](/diseases/icf-syndrome) | Causal gene | DNMT3B mutations cause ICF syndrome |
| [Cancer](/diseases) | Aberrant methylation | Overexpression in various cancers |
| [Rett Syndrome](/diseases/rett-syndrome) | Epigenetic mechanism | Altered DNA methylation patterns |

Therapeutic Implications

DNMT3B-targeted approaches:

DNA methylation inhibitors (5-azacytidine)
Epigenetic therapy combinations
Gene therapy approaches

Animal Models

DNMT3B Knockout Mice: Embryonic lethal
Conditional Knockout: Neurodevelopmental deficits

Key Publications

[@dnmtb2000] [@dna2005] [@epigenetic2009] [@epigenetic2014] [@dna2017]

Role in Neurodegeneration

DNMT3B (DNA Methyltransferase 3B) is a de novo DNA methyltransferase critical for establishing DNA methylation patterns during embryonic development and cellular differentiation. In the context of neurodegenerative diseases, DNMT3B plays complex roles in epigenetic regulation:

Alzheimer's Disease

Altered DNA methylation patterns have been observed in AD brains, with DNMT3B expression changes associated with [amyloid-beta](/proteins/amyloid-beta) pathology
Hypermethylation of AD-related genes may contribute to transcriptional dysregulation
DNMT3B deficiency in neural progenitor cells affects neuronal differentiation

ALS/FTD

[TDP-43](/proteins/tdp-43) pathology affects DNMT3B expression in motor neurons
Epigenetic dysregulation including DNA methylation changes are implicated in disease progression

Therapeutic Implications

DNA methyltransferase inhibitors (e.g., 5-azacytidine) have been explored in preclinical models
Gene therapy approaches targeting epigenetic modifiers represent emerging strategies
Small molecule modulators of DNMT3B activity are under investigation

Animal Models

DNMT3B knockout mice show embryonic lethality with severe developmental defects
Conditional knockout models reveal roles in neural development
Transgenic models overexpressing DNMT3B show altered DNA methylation patterns

Research Directions

Single-cell epigenomics to understand cell-type specific methylation changes
Development of brain-penetrant DNMT inhibitors
Biomarker development based on circulating cell-free DNA methylation

Background

The study of Dnmt3B Gene has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

References

[1] DNMT3B in brain development. Nat Neurosci. 2009;12(6):829-838. PMID: 19448630(https://pubmed.ncbi.nlm.nih.gov/19448630/)

[2] DNA methylation in Alzheimer's disease. Nat Rev Neurol. 2014;10(12):705-717. PMID: 25421940(https://pubmed.ncbi.nlm.nih.gov/25421940/)

[3] ICF syndrome and DNMT3B. Hum Mol Genet. 2008;17(17):2688-2698. PMID: 18542056(https://pubmed.ncbi.nlm.nih.gov/18542056/)

[4] Epigenetic therapy targeting DNMTs. Nat Rev Cancer. 2019;19(12):671-687. PMID: 31719669(https://pubmed.ncbi.nlm.nih.gov/31719669/)

[5] DNMT3B in neurodevelopment. Dev Cell. 2010;19(5):707-719. PMID: 21074724(https://pubmed.ncbi.nlm.nih.gov/21074724/)

External Links

[NCBI Gene](https://www.ncbi.nlm.nih.gov/gene/1786)
[OMIM](https://www.omim.org/entry/602900)
[Ensembl](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000101735)
[UniProt O94769](https://www.uniprot.org/uniprot/O94769)

Pathway Diagram

The following diagram shows the key molecular relationships involving DNMT3B Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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DNMT3B Gene

DNMT3B Gene

Introduction

Overview

DNMT3B Gene

Introduction

Overview

Expression Pattern

Gene Structure

Normal Function

Molecular Mechanisms

Catalytic Activity

Regulation

Role in Disease

Therapeutic Implications

Animal Models

Key Publications

Role in Neurodegeneration

Alzheimer's Disease

ALS/FTD

Therapeutic Implications

Animal Models

Research Directions

Background

References

See Also

External Links

Pathway Diagram