CHD1 Gene

CHD1 — Chromodomain Helicase DNA Binding Protein 1

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">CHD1 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>CHD1</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Chromodomain Helicase DNA Binding Protein 1</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>5q21.1</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>1105</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>602118</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000153922</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td>Q86W28</td>
</tr>
<tr>
<td class="label">Protein Type</td>
<td>ATP-dependent chromatin remodeler</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~223 kDa</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">2 edges</a></td>
</tr>
</table>

Overview

CHD1 — Chromodomain Helicase DNA Binding Protein 1

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">CHD1 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>CHD1</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Chromodomain Helicase DNA Binding Protein 1</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>5q21.1</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>1105</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>602118</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000153922</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td>Q86W28</td>
</tr>
<tr>
<td class="label">Protein Type</td>
<td>ATP-dependent chromatin remodeler</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~223 kDa</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">2 edges</a></td>
</tr>
</table>

Overview

Introduction

CHD1 (Chromodomain Helicase DNA Binding Protein 1) is a member of the chromodomain helicase/ATPase (CHD) family of proteins that utilize ATP to remodel chromatin structure [@chd]. As an ATP-dependent chromatin remodeler, CHD1 plays essential roles in regulating gene expression by modulating nucleosome positioning, facilitating transcription factor access, and maintaining chromatin integrity [@kelley2019]. These functions are particularly critical in [neurons](/entities/neurons), where precise epigenetic regulation underlies synaptic plasticity, learning, memory, and neuronal survival.

Molecular Function

Chromatin Remodeling Activity

CHD1 belongs to the SNF2H family of ATP-dependent chromatin remodelers and possesses several conserved domains:

• Chromodomains: Two N-terminal chromodomains that recognize methylated histone tails, particularly H3K4me3, targeting CHD1 to promoter regions
• SANT domains: Involved in histone tail binding and chromatin interaction
• ATPase Domain: The central helicase/ATPase domain (approximately 300 amino acids) provides the energy for nucleosome sliding, eviction, and restructuring
• DNA-Binding Domains: C-terminal domains that facilitate interaction with DNA

Nucleosome Remodeling Mechanisms

CHD1 remodels chromatin through several mechanisms:

Interaction Partners

CHD1 interacts with several key cellular proteins and complexes:

• RNA Polymerase II: CHD1 associates with RNAPII throughout the transcription cycle, facilitating elongation
• Histone Acetyltransferases (HATs): Works with p300/CBP and GCN5 to coordinate transcription activation
• Histone Methyltransferases: Interacts with SETD1A/B and MLL complexes for H3K4 methylation
• SAGA Complex: Part of the SAGA coactivator complex, linking chromatin modification to transcription

Role in Transcription Regulation

Transcriptional Activation

CHD1 is primarily associated with active transcription:

• Promoter Clearance: Facilitates RNAPII promoter clearance and transition to productive elongation
• Elongation Control: Associates with the PAF1 complex to regulate transcription elongation
• Alternative Splicing: Influences co-transcriptional alternative splicing by affecting nucleosome positioning near splice sites

Transcriptional Programs in Neurons

In neurons, CHD1 regulates several critical transcriptional programs:

• Synaptic Plasticity Genes: Controls expression of immediate-early genes (IEGs) like c-Fos, Arc, and Egr1 that are essential for synaptic strengthening
• Neurotrophic Factors: Regulates BDNF and other neurotrophin expression
• Ion Channel Genes: Modulates expression of voltage-gated ion channels
• Receptor Expression: Influences [NMDA receptor](/entities/nmda-receptor) and AMPA receptor subunit expression

DNA Repair Functions

Chromatin Remodeling in DNA Repair

CHD1 plays important roles in maintaining genomic integrity:

• Nucleotide Excision Repair (NER): Facilitates chromatin remodeling at DNA damage sites
• Transcription-Coupled Repair (TCR): Couples transcription to DNA repair, particularly important in post-mitotic neurons
• Homologous Recombination: Participates in HR repair pathways
• Base Excision Repair (BER): Supports chromatin accessibility for BER enzymes

Neuronal DNA Repair

Neurons face unique DNA repair challenges:

• Non-dividing cells: Unlike proliferating cells, neurons cannot use homologous recombination extensively
• High metabolic demand: High oxidative metabolism increases DNA damage accumulation
• Transcriptional activity: Active transcription makes neurons vulnerable to transcription-coupled DNA damage

Disease Associations

Amyotrophic Lateral Sclerosis (ALS)

Rare CHD1 mutations have been identified in familial ALS cases [@sathyanarayana2017]:

• Pathogenic Variants: Missense mutations in CHD1 have been found in ALS patients
• Mechanism: Mutations may disrupt chromatin remodeling and DNA repair in motor neurons
• Overlapping Pathways: CHD1 dysfunction may synergize with known ALS genes (SOD1, [C9orf72](/entities/c9orf72), [TDP-43](/mechanisms/tdp-43-proteinopathy), FUS)

Neurodevelopmental Disorders

CHD1 variants are associated with several neurodevelopmental conditions:

• Intellectual Disability: De novo CHD1 mutations identified in patients with intellectual disability
• Autism Spectrum Disorder (ASD): CHD1 variants found in ASD cohorts
• Developmental Delay: Variable phenotypic presentation including developmental delay

Cancer Associations

While primarily a neurological gene, CHD1 has implications in cancer:

• Prostate Cancer: CHD1 loss associated with aggressive prostate cancer
• Breast Cancer: CHD1 alterations in certain breast cancer subtypes
• Lymphoma: CHD1 mutations in some hematopoietic malignancies

Expression Pattern

Tissue Distribution

CHD1 is ubiquitously expressed with high expression in:

• Brain (highest expression in neurons)
• Testis
• Embryonic stem cells
• Proliferating cells

Brain Expression

In the brain, CHD1 is expressed throughout development:

• Developmental Expression: High expression during neurogenesis and brain development
• Adult Brain: Maintained expression in mature neurons
• Cell-Type Specificity: Primarily neuronal expression, lower in glia

Therapeutic Implications

Epigenetic Drug Targets

CHD1 and chromatin remodelers represent potential therapeutic targets:

• BET Inhibitors: Bromodomain inhibitors may compensate for CHD1 dysfunction
• [HDAC](/entities/hdac-enzymes) Inhibitors: Histone deacetylase inhibitors can modulate chromatin state
• Small Molecule Modulators: Development of specific CHD1 modulators is ongoing

Gene Therapy Approaches

Future therapeutic strategies may include:

• CRISPR-Based Correction: Precise correction of pathogenic CHD1 variants
• Epigenetic Engineering: Targeted epigenetic modifications to compensate for CHD1 loss
• Small Molecule Enhancers: Compounds that enhance remaining CHD1 function

See Also

• [CHD1 Protein](/proteins/chd1-protein)
• [Chromatin Remodeling](/mechanisms/chromatin-remodeling)
• [Epigenetic Regulation](/mechanisms/epigenetic-regulation)
• [ALS](/diseases/amyotrophic-lateral-sclerosis)
• [DNA Repair Mechanisms](/mechanisms/dna-repair)
• [Transcription Regulation](/mechanisms/transcription-regulation)
• [Neuronal Epigenetics](/cell-types/neurons#epigenetic-regulation)

External Links

• [CHD1 Gene - NCBI](https://www.ncbi.nlm.nih.gov/gene/1105)
• [UniProt CHD1](https://www.uniprot.org/uniprot/Q86W28)
• [OMIM CHD1](https://www.omim.org/entry/602118)
• [Ensembl CHD1](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000153922)

References

Pathway Diagram

The following diagram shows the key molecular relationships involving CHD1 Gene discovered through SciDEX knowledge graph analysis: