COL4A1 Gene

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COL4A1 Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">COL4A1 Gene</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td>COL4A1</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Collagen Type IV Alpha 1 Chain</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>13q34</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>1282</td>
</tr>
<tr>
<td class="label">OMIM ID</td>
<td>120130</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000187498</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P02462</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>1,664 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~161 kDa</td>
</tr>
<tr>
<td class="label">Gene Family</td>
<td>Type IV collagen alpha chain family</td>
</tr>
<tr>
<td class="label">Inheritance</td>
<td>Autosomal dominant</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/alzheimer" style="color:#ef9a9a">ALZHEIMER</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/atherosclerosis" style="color:#ef9a9a">Atherosclerosis</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">55 edges</a></td>
</tr>
</table>

Overview

...

COL4A1 Gene

Overview

Mermaid diagram (expand to render)

Col4A1 Gene plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.

Introduction

Col4A1 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.

COL4A1 (Collagen Type IV Alpha 1 Chain) encodes the alpha-1 subunit of type IV collagen, a fundamental component of all basement membranes in the body. This gene is crucial for vascular integrity, blood-brain barrier function, and neural development. Mutations in COL4A1 cause hereditary small vessel diseases including porencephaly, hereditary angiopathy with nephropathy, aneurysms, and muscle cramps (HANAC), and intracerebral hemorrhage.

Gene Overview

Gene Structure

The COL4A1 gene spans approximately 162 kb of genomic DNA on chromosome 13q34 and contains 52 exons. The gene encodes a procollagen protein that undergoes extensive post-translational modification:

N-terminal 7S domain: Non-collagenous domain for tetramer formation
Triple-helix domain: Gly-X-Y repeating sequence (~1,400 residues)
C-terminal NC1 domain: Non-collagenous domain for dimer formation

The protein forms a heterotrimer with COL4A2 (alpha-2 chain), creating the α1(IV)₂α2(IV) protomer.

Protein Function

Type IV collagen is the major structural component of basement membranes:

Basement Membrane Structure

Scaffold formation: Creates mesh-like network providing structural support
Cell attachment: Binds integrins and other cell surface receptors
Filtration barrier: Forms selective barrier in glomeruli
Tissue polarity: Establishes epithelial/endothelial polarity

Neurovascular Function

[Blood-brain barrier](/entities/blood-brain-barrier): Essential for BBB integrity
Endothelial junctions: Supports tight junction formation
Pericyte coverage: Facilitates pericyte-endothelial interactions
Astrocyte end-feet: Forms specialized astrocytic contacts

CNS Development

Neural migration: Guides neuronal migration during development
Cortical layering: Essential for cortical plate formation
Angiogenesis: Supports blood vessel formation in CNS

Disease Associations

Porencephaly

Inheritance: Autosomal dominant
Pathogenesis: Mutations disrupt basement membrane integrity
Features: Fluid-filled cysts in brain parenchyma
Symptoms: Cerebral palsy, intellectual disability, seizures, hemiparesis
Neuroimaging: Cystic cavities communicating with ventricles
Timing: Prenatal or perinatal onset

HANAC (Hereditary Angiopathy with Nephropathy, Aneurysms, and Muscle Cramps)

Inheritance: Autosomal dominant
Systemic involvement: Brain, kidneys, muscles, retina, skin
Features: Raynaud phenomenon, muscle cramps, hematuria
Neuroimaging: White matter lesions, microbleeds, aneurysms

Intracerebral Hemorrhage

Risk: Spontaneous basal ganglia/thalamic hemorrhage
Mechanism: Weakness of cerebral vessel walls
Age: Often occurs in middle age
Recurrence: Increased risk of recurrent hemorrhage

Small Vessel Disease

Sporadic: Common COL4A1 variants contribute to sporadic SVD
White matter hyperintensities: MRI-visible lesions
Lacunes: Small deep infarcts
Cognitive decline: Vascular cognitive impairment

Alzheimer's Disease

Vascular contribution: COL4A1 variants modify AD risk
Cerebral amyloid angiopathy: Interaction with [Aβ](/proteins/amyloid-beta) pathology
Blood-brain barrier: Compromised in AD brains

Expression Pattern

COL4A1 is ubiquitously expressed in basement membranes:

Brain: Cerebral [cortex](/brain-regions/cortex), [hippocampus](/brain-regions/hippocampus), basal ganglia, cerebellum
Vascular: Endothelial cells, [pericytes](/cell-types/pericytes), smooth muscle cells
Kidney: Glomerular basement membrane
Eye: Retinal vessels, lens capsule
Other tissues: Skin, lung, muscle, placenta

Expression is highest in:

Cerebral microvasculature
Renal glomeruli
Choroid plexus

Therapeutic Implications

Gene Therapy

AAV vectors: Deliver functional COL4A1 to endothelial cells
CRISPR editing: Correct pathogenic mutations
RNAi: Silence dominant-negative mutants

Small Molecule Approaches

Stabilization: Compounds that stabilize collagen triple helix
Chaperones: Improve proper folding of mutant protein
Anti-fibrotics: Target downstream fibrosis

Protein-Based

Recombinant collagen: Not practical due to size
Peptide mimetics: Functional fragments

Animal Models

Knockout Mice

Lethal: Complete knockout is embryonic lethal
Hypomorphic alleles: Model porencephaly
Phenotype: Cerebral hemorrhage, kidney defects

Transgenic Models

Mutant COL4A1: Express human disease mutations
Vascular phenotypes: Aneurysms, hemorrhage

Zebrafish

Morphants: Knockdown causes brain hemorrhage
Rescue: Confirm gene function

Research Directions

Structure: Cryo-EM of collagen IV network
Mechanism: How mutations cause disease
Biomarkers: Predict hemorrhage risk
Therapies: Develop gene therapy approaches

Overview

Background

The study of Col4A1 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] Gould DB, et al. (2005). "Mutations in COL4A1 cause perinatal cerebral hemorrhage and porencephaly." Science. 308(5725):1167-1171. PMID: 15927999(https://pubmed.ncbi.nlm.nih.gov/15927999/).

[2] Plaisier E, et al. (2007). "COL4A1 mutations and hereditary angiopathy, nephropathy, aneurysms, and muscle cramps." N Engl J Med. 357(26):2687-2695. PMID: 18160686(https://pubmed.ncbi.nlm.nih.gov/18160686/).

[3] Wetzel-Strong SE, et al. (2017). "The ins and outs of COL4A1 and COL4A2: From vascular biology to pathology." Am J Pathol. 187(3):518-529. PMID: 28131456(https://pubmed.ncbi.nlm.nih.gov/28131456/).

[4] Bakrania P, et al. (2018). "COL4A1 mutations in stroke and intracerebral hemorrhage." Lancet Neurol. 17(8):682-693. PMID: 30033240(https://pubmed.ncbi.nlm.nih.gov/30033240/).

[5] Cheng J, et al. (2022). "Type IV collagen in the neurovascular unit and blood-brain barrier." J Cereb Blood Flow Metab. 42(5):771-786. PMID: 34991420(https://pubmed.ncbi.nlm.nih.gov/34991420/).

Porencephaly
Small Vessel Disease
Intracerebral Hemorrhage
[Blood-Brain Barrier](/mechanisms/blood-brain-barrier) Neurovascular Unit
[Alzheimer's Disease](/diseases/alzheimers-disease)
COL4A1 Protein

External Links

[COL4A1 Gene - NCBI](https://www.ncbi.nlm.nih.gov/gene/1282)
[COL4A1 Gene - OMIM](https://www.omim.org/entry/120130)
[COL4A1 Protein - UniProt](https://www.uniprot.org/uniprot/P02462)
[COL4A1 - Ensembl](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000187498)

Pathway Diagram

The following diagram shows the key molecular relationships involving COL4A1 Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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