SEMA3F Gene

SEMA3F — Semaphorin 3F

Overview

Sema3F 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

SEMA3F — Semaphorin 3F

Overview

Sema3F 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

SEMA3F (Semaphorin 3F) encodes a secreted axonal guidance molecule critical for neuronal development, synaptic organization, and vascular patterning. As a member of the class 3 semaphorins, SEMA3F signals through neuropilin-2 (NRP2) and plexin receptor complexes to exert its effects on axonal repulsion and dendritic growth. Beyond development, SEMA3F plays roles in cancer suppression, immune regulation, and has been implicated in neurodegenerative diseases including Alzheimer's disease and amyotrophic lateral sclerosis. [@semaf2006]

<div class="infobox infobox-gene"> [@class2005]
<table> [@semaf2010]
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">Semaphorin 3F</th></tr> [@semaphorins2017]
<tr><td><strong>Gene Symbol</strong></td><td>SEMA3F</td></tr> [@semaf2014]
<tr><td><strong>Full Name</strong></td><td>Semaphorin 3F</td></tr> [@targeting2019]
<tr><td><strong>Chromosome</strong></td><td>3p21.31</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[10715](https://www.ncbi.nlm.nih.gov/gene/10715)</td></tr>
<tr><td><strong>OMIM</strong></td><td>[601124](https://www.omim.org/entry/601124)</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000061656</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[Q13241](https://www.uniprot.org/uniprot/Q13241)</td></tr>
<tr><td><strong>Protein Class</strong></td><td>Axonal guidance molecule (Class 3 Semaphorin)</td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Cancer (suppressor), Potential roles in AD/ALS</td></tr>
</table>
</div>

Molecular Biology and Biochemistry

Protein Structure

SEMA3F is a 810-amino acid secreted protein with the following domain organization:

• Sema Domain (aa 24-660): Conserved semaphorin fold, receptor binding
• PSI Domain (aa 670-740): Plexin interaction domain
• Basic C-terminal Domain (aa 750-810): Heparin-binding, receptor specificity

Receptor Complexes

SEMA3F signals through a dual-receptor system:

| Receptor | Co-receptor | Function |
|----------|-------------|----------|
| Plexin A3 (PLXNA3) | NRP2 | Axon repulsion in CNS |
| Plexin A4 (PLXNA4) | NRP2 | Spinal cord patterning |
| NRP2 | NRP2 alone | Partial signaling |

Signal Transduction

Upon receptor binding, SEMA3F triggers downstream cascades:

Expression Pattern

Brain Expression

SEMA3F exhibits region-specific expression in the developing and adult brain:

• [Hippocampus](/brain-regions/hippocampus): High expression in CA1-CA3 pyramidal [neurons](/entities/neurons)
• Cerebral [cortex](/brain-regions/cortex): Layer-specific expression (II-IV)
• Cerebellum: Purkinje cell expression
• Olfactory bulb: Mitral and tufted cell expression
• Thalamus: Specific relay nuclei

Cellular Localization

• Neurons: Somatic, dendritic, and axonal compartments
• [Astrocytes](/entities/astrocytes): Astrocytic processes near synapses
• Endothelial cells: Vascular expression

Physiological Functions

Axonal Guidance

During development, SEMA3F provides repulsive cues for:

• Corticospinal tract patterning
• Commissural axon guidance
• Olfactory sensory neuron targeting
• Hippocampal mossy fiber stratification

Dendritic Development

SEMA3F regulates:

• Dendritic arbor complexity
• Spine morphology
• Synaptic partner matching
• Layer-specific dendritic targeting

Synaptic Organization

At mature synapses, SEMA3F:

• Maintains synaptic stability
• Regulates presynaptic release machinery
• Modulates postsynaptic receptor clusters
• Controls inhibitory synapse formation

Vascular Patterning

SEMA3F is a potent inhibitor of:

• Angiogenesis
• Vascular endothelial cell migration
• Tumor vasculature formation

Disease Associations

Cancer

SEMA3F functions as a tumor suppressor:

| Cancer Type | Evidence | Mechanism |
|-------------|----------|----------|
| Lung cancer | Reduced expression in tumors | Promotes metastasis |
| Breast cancer | Loss of heterozygosity | Enhanced angiogenesis |
| Ovarian cancer | Epigenetic silencing | Cell survival |
| Colorectal cancer | Reduced expression | Migration/invasion |

Therapeutic potential: SEMA3F-based therapies for anti-angiogenic treatment.

Alzheimer's Disease

Multiple lines of evidence connect SEMA3F to AD:

• Amyloid effects: [Aβ](/proteins/amyloid-beta) downregulates SEMA3F expression
• [Tau](/proteins/tau) pathology: Neurofibrillary tangles disrupt SEMA3F signaling
• Synaptic loss: SEMA3F dysregulation contributes to synapse elimination
• Neurogenesis: Impaired hippocampal neurogenesis in AD models

Amyotrophic Lateral Sclerosis

• Motor neuron vulnerability: SEMA3F may contribute to selective motor neuron death
• Glutamate excitotoxicity: SEMA3F modulates excitatory signaling
• Axonal transport: Dysregulated guidance signaling in ALS

Parkinson's Disease

• Dopaminergic neurons: SEMA3F affects SNc neuron connectivity
• Axonal integrity: Guidance molecule dysregulation in PD
• Potential therapeutic: SEMA3F-based regenerative approaches

Therapeutic Implications

Cancer Therapy

• Recombinant SEMA3F: Protein-based anti-angiogenic therapy
• Gene therapy: Adenoviral SEMA3F delivery to tumors
• Small molecule mimetics: Non-peptide SEMA3F agonists

Neurodegenerative Disease

• AD: SEMA3F delivery to enhance synaptic plasticity
• ALS: Neuroprotective strategies targeting semaphorin signaling
• Regenerative medicine: Enhancing axonal regeneration

Research Methods

Experimental Models

• Knockout mice: Sema3f-/- mice show abnormal patterning
• Zebrafish: Live imaging of axon guidance
• iPSC neurons: Patient-derived neuronal models

Detection Techniques

• In situ hybridization: mRNA localization
• Immunohistochemistry: Protein distribution
• Growth cone collapse assays: Functional activity
• Axon tracing: Neural circuitry mapping

Summary

SEMA3F is a critical axonal guidance molecule with diverse functions in neuronal development, synaptic organization, and disease. As a tumor suppressor with roles in cancer and neurodegeneration, SEMA3F represents a promising therapeutic target for both oncology and neurological disorders.

Overview

Sema3F 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.

Background

The study of Sema3F 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.

See Also

• - Protein product
• [mechanisms/axon-guidance-neurodegeneration|Axon Guidance] - Related mechanism
• - Related pathway

External Links

• [NCBI Gene: SEMA3F](https://www.ncbi.nlm.nih.gov/gene/10500)
• [UniProt: SEMA3F](https://www.uniprot.org/uniprot/Q13243)
• [GeneCards: SEMA3F](https://www.genecards.org/cgi-bin/carddisp.pl?gene=SEMA3F)

References

Pathway Diagram

The following diagram shows the key molecular relationships involving SEMA3F Gene discovered through SciDEX knowledge graph analysis: