SEPTIN14 — Septin 14

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SEPTIN14 — Septin 14

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SEPTIN14 — Septin 14

<div class="infobox infobox-gene">
<div class="infobox-header">Septin 14</div>

Overview

SEPTIN14 encodes Septin 14, a member of the highly conserved septin family of GTP-binding proteins that play essential roles in cellular organization, cytokinesis, membrane dynamics, and cytoskeletal coordination. Located on chromosome 22q12.3, the SEPTIN14 gene encodes a 427-amino acid protein that belongs to the SEPT2/SEPT4 subfamily of septins. While historically considered primarily testis-specific with roles in male fertility, emerging research has revealed broader expression patterns and potential physiological roles in neuronal cells, including functions relevant to neurodegenerative diseases[@hall2015][@kinoshita2008].

The septin family has been increasingly implicated in neurodegenerative diseases, with several members—particularly SEPT4 and SEPT5—linked directly to Parkinson's disease pathogenesis through genetic associations and pathological findings in Lewy bodies. SEPTIN14, as a member of the same phylogenetic subfamily, shares structural and functional relationships that may confer similar disease-relevant functions or compensatory capacities[@ishida2016][@fujishima2015].

...

SEPTIN14 — Septin 14

<div class="infobox infobox-gene">
<div class="infobox-header">Septin 14</div>

Overview

SEPTIN14 encodes Septin 14, a member of the highly conserved septin family of GTP-binding proteins that play essential roles in cellular organization, cytokinesis, membrane dynamics, and cytoskeletal coordination. Located on chromosome 22q12.3, the SEPTIN14 gene encodes a 427-amino acid protein that belongs to the SEPT2/SEPT4 subfamily of septins. While historically considered primarily testis-specific with roles in male fertility, emerging research has revealed broader expression patterns and potential physiological roles in neuronal cells, including functions relevant to neurodegenerative diseases[@hall2015][@kinoshita2008].

The septin family has been increasingly implicated in neurodegenerative diseases, with several members—particularly SEPT4 and SEPT5—linked directly to Parkinson's disease pathogenesis through genetic associations and pathological findings in Lewy bodies. SEPTIN14, as a member of the same phylogenetic subfamily, shares structural and functional relationships that may confer similar disease-relevant functions or compensatory capacities[@ishida2016][@fujishima2015].

<div class="infobox-row">
<span class="infobox-label">Gene Symbol</span>
<span class="infobox-value">SEPTIN14</span>
</div>
<div class="infobox-row">
<span class="infobox-label">Full Name</span>
<span class="infobox-value">Septin 14</span>
</div>
<div class="infobox-row">
<span class="infobox-label">Chromosomal Location</span>
<span class="infobox-value">22q12.3</span>
</div>
<div class="infobox-row">
<span class="infobox-label">NCBI Gene ID</span>
<span class="infobox-value">[340533](https://www.ncbi.nlm.nih.gov/gene/340533)</span>
</div>
<div class="infobox-row">
<span class="infobox-label">OMIM</span>
<span class="infobox-value">[615898](https://www.omim.org/entry/615898)</span>
</div>
<div class="infobox-row">
<span class="infobox-label">Ensembl ID</span>
<span class="infobox-value">[ENSG00000167036](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000167036)</span>
</div>
<div class="infobox-row">
<span class="infobox-label">UniProt ID</span>
<span class="infobox-value">[Q6ZNA4](https://www.uniprot.org/uniprot/Q6ZNA4)</span>
</div>
<div class="infobox-row">
<span class="infobox-label">Protein Length</span>
<span class="infobox-value">427 amino acids</span>
</div>
<div class="infobox-row">
<span class="infobox-label">Protein Class</span>
<span class="infobox-value">GTP-binding protein (Septin family)</span>
</div>
<div class="infobox-row">
<span class="infobox-label">Associated Diseases</span>
<span class="infobox-value">Male Infertility, Parkinson's Disease, Alzheimer's Disease, Neurodegeneration</span>
</div>
</div>

Gene Structure and Evolution

Genomic Organization

The SEPTIN14 gene spans approximately 11 kb on chromosome 22q12.3 and consists of multiple exons that encode the 427-amino acid protein product. The gene structure follows the conserved septin architecture with:

N-terminal GTP-binding domain (G domain): Highly conserved region spanning approximately 300 amino acids

Switch regions: Variable regions controlling GTP hydrolysis and nucleotide exchange

C-terminal helical domain: Mediates filament formation and higher-order assembly

Polybasic membrane-binding region: Directs association with phospholipid membranes

Evolutionary Conservation

Septins emerged early in eukaryotic evolution with remarkable conservation across species. SEPTIN14 underwent specific expansion in primates, representing a relatively recent addition to the septin family:

| Species | Ortholog Status | Sequence Identity | Functional Conservation |
|---------|-----------------|-------------------|-------------------------|
| Human | SEPTIN14 | Reference | Complete function |
| Chimpanzee | SEPTIN14 | 99% | Full conservation |
| Rhesus monkey | SEPTIN14 ortholog | 95% | High conservation |
| Mouse | No ortholog | N/A | Absent |
| Zebrafish | Ancestral septin | 65% | Partial function |
| Drosophila | Septin ortholog | 58% | Basic function |
| C. elegans | Septin | 45% | Primitive function |

The absence of a direct ortholog in rodents suggests that SEPTIN14 may have specialized functions in primates that are not essential for basic cellular viability, making it potentially more amenable to therapeutic modulation[@petersen2018].

Protein Structure and Biochemistry

GTP-Binding and Hydrolysis Mechanism

Septins share features with classical GTPases but possess unique properties that distinguish them:

Nucleotide Binding:

Binds GDP and GTP with moderate affinity (Kd ~ 0.1-1 μM)
Exhibits slow intrinsic GTPase activity compared to Ras family GTPases
GTP/GDP exchange rates are regulated by interactions with other proteins

GTPase Cycle:

GTP-bound form is typically the active, polymerization-competent state
Hydrolysis to GDP induces conformational changes that affect assembly
Nucleotide exchange factors and GTPase-activating proteins modulate the cycle

Conformational Switch:

The switch regions (Switch I and Switch II) undergo structural changes between GTP and GDP states
These conformational shifts regulate protein-protein interactions
Allow septins to function as molecular switches in cellular processes[@weirich2016]

Oligomerization and Filament Assembly

SEPTIN14 forms hetero-oligomeric complexes with other septins, a fundamental property of septin biology:

Basic Oligomeric Units:

The fundamental building block is a hexamer or octamer of mixed septin subunits
SEPTIN14 preferentially pairs with SEPT2/SEPT4 subfamily members
Heterooligomer composition determines functional specificity

Filament Formation:

Linear polymers can extend from oligomeric cores
Filaments typically consist of alternating septin subtypes
Higher-order structures include bundles, rings, and lattices

Membrane Association:

The polybasic region at the C-terminus binds phospholipids
Preferentially associates with phosphatidylinositol species
Targets septin filaments to specific membrane domains[@silvius2015][@nakahira2021]

Protein-Protein Interaction Network

SEPTIN14 interacts with multiple cellular proteins to execute its functions:

| Partner | Interaction Type | Functional Consequence |
|---------|-----------------|------------------------|
| SEPT2 | Direct binding | Core complex formation |
| SEPT4 | Direct binding | Complex formation, potential redundancy |
| SEPT6 | Direct binding | Filament extension |
| SEPT7 | Scaffold binding | Higher-order structure formation |
| Actin cytoskeleton | Indirect | Cytoskeletal coordination |
| Microtubules | Indirect | Transport and positioning |
| Phospholipids | Direct binding | Membrane targeting |
| α-Synuclein | Potential | Aggregation modulation |

Expression Patterns and Cellular Localization

Tissue Distribution

SEPTIN14 exhibits a distinctive and tissue-specific expression pattern:

High Expression:

Testis: Highest expression in spermatogenic cells, particularly spermatids
Epididymis: Detected in epithelial cells of the epididymal duct

Moderate Expression:

Brain: Low but detectable expression in various neuronal populations
Ovary: Some expression in female reproductive tissues

Low/Trace Expression:

Most other somatic tissues show minimal expression

Brain Expression and Neuronal Localization

In the nervous system, SEPTIN14 shows specific patterns:

Neuronal Expression:

Detected in cortical neurons
Present in hippocampal pyramidal neurons
Expressed in cerebellar Purkinje cells
Lower levels in subcortical structures

Cellular Compartmentalization:

Cytoplasmic: Diffuse cytoplasmic distribution in neuronal soma
Membrane-associated: Concentrated at plasma membrane, particularly in dendrites
Organelle membranes: Associates with Golgi apparatus and endosomal compartments
Neuronal processes: Found in both axons and dendrites
Synaptic terminals: Present at presynaptic and postsynaptic compartments

The neuronal expression pattern suggests potential roles in synaptic function and membrane trafficking, making SEPTIN14 relevant to neurodegenerative disease mechanisms[@tornam2020][@sanchez2020].

Biological Functions

Cellular Organization and Cytoskeletal Coordination

Septins serve as critical scaffolds for cellular organization:

Cytoskeletal Coordination: SEPTIN14 interacts with actin microfilaments and microtubules to coordinate cytoskeletal dynamics

Membrane Domain Organization: Organizes lipid rafts and signaling platforms at specific membrane compartments

Organelle Positioning: Maintains subcellular organization of Golgi, endosomes, and other organelles

Cell Polarity: Contributes to establishment and maintenance of cellular polarity

Cytokinesis: In non-neuronal cells, participates in cytokinesis through contractile ring formation

Spermatogenesis and Male Fertility

In testis, SEPTIN14 plays essential roles in male reproduction:

Spermatid Development:

Essential for proper spermiogenesis (the transformation of spermatids to spermatozoa)
Contributes to sperm head formation and elongation
Involved in the organization of the manchette, a transient microtubule structure

Sperm Motility:

Contributes to flagellar function and motility
Mutations associated with asthenozoospermia (reduced sperm motility)
Structural role in the sperm tail axoneme

Male Infertility:

SEPTIN14 mutations cause male infertility through multiple mechanisms
Biallelic loss-of-function mutations lead to oligospermia or azoospermia
Associated with abnormal sperm morphology (teratozoospermia)[@ota2017]

Neuronal Functions

Emerging evidence supports neuronal roles for SEPTIN14:

Synaptic Function:

Septins are enriched at synaptic terminals where they regulate neurotransmitter release
SEPTIN14 may contribute to synaptic vesicle trafficking and positioning
Potential roles in synaptic plasticity mechanisms

Axonal Transport:

Coordinates with microtubule motors for efficient transport
May contribute to organelle transport in neuronal processes
Potential involvement in axonal maintenance

Membrane Trafficking:

Participates in endocytic and exocytic pathways
Contributes to protein sorting and trafficking
Potential roles in receptor turnover at synapses

Dendritic Arborization:

May influence neuronal morphology and branching
Contributes to cytoskeletal organization in dendrites
Potential impact on connectivity

Role in Neurodegenerative Diseases

Parkinson's Disease

SEPTIN14 shares structural and functional relationships with septins directly linked to Parkinson's disease pathogenesis:

SEPT4 and SEPT5 Connections (PARK17 Locus):

SEPT4 mutations have been linked to familial PD
SEPT5 deficiency causes parkinsonism in mouse models
Both SEPT4 and SEPT5 are found in Lewy bodies, the pathological hallmark of PD

SEPTIN14 Relevance:

Belongs to the same SEPT2/SEPT4 subfamily as disease-linked septins
May have overlapping functions with SEPT4/SEPT5
Potential to compensate for deficient septin function
May serve as a genetic modifier of PD risk

Mechanisms of Contribution:

Impaired dopamine release due to septin dysfunction
Synaptic vesicle trafficking defects
Mitochondrial distribution abnormalities
Potential modulation of α-synuclein aggregation
Involvement in protein quality control pathways[@arai2002][@kawashima2017][@kim2020]

Alzheimer's Disease

Septin alterations are documented in AD brain pathology:

Septin Family Dysregulation:

SEPT11 shows altered expression patterns in AD brain
SEPT2 and SEPT3 are found in neurofibrillary tangles composed of hyperphosphorylated tau
SEPT5 expression correlates with cognitive decline severity
Overall septin homeostasis is disrupted in AD

SEPTIN14 Potential Role:

While direct involvement of SEPTIN14 in AD is not established, the broader septin family connections suggest potential interactions
May modify disease progression through cytoskeletal mechanisms
Could affect tau pathology through microtubule-related functions
Potential biomarker utility given testis-specific expression patterns[@matsui2018][@zhang2019]

Huntington's Disease

Septin changes are observed in HD models and patient tissue:

Altered septin expression in striatal neurons, the primary affected cell type in HD
Contributes to synaptic dysfunction through vesicle trafficking defects
May affect mitochondrial dynamics and distribution
SEPT4 variants may modify disease progression in HD models

Amyotrophic Lateral Sclerosis

Septin involvement in motor neuron disease:

SEPT4 variants modify disease progression in ALS patients
Septin filaments found in motor neuron inclusions
Cytoskeletal disruption is a feature of ALS pathology
Potential roles in TDP-43 proteinopathy

Other Neurodegenerative Conditions

Septin dysfunction may contribute to:

Frontotemporal Dementia: Septin alterations in protein aggregates
Prion Diseases: Septin involvement in prion protein trafficking
Multiple System Atrophy: SEPT4 in glial cytoplasmic inclusions

Molecular Mechanisms in Neurodegeneration

Synaptic Dysfunction

Septins play critical roles in synaptic biology that become compromised in disease:

Presynaptic Mechanisms:

Regulate synaptic vesicle pool organization
Control vesicle docking and release probability
Influence vesicle recycling kinetics
Maintain active zone structure

Postsynaptic Effects:

Organize postsynaptic density
Regulate receptor trafficking and clustering
Affect dendritic spine morphology
Contribute to synaptic plasticity

Protein Quality Control

Septins interface with cellular protein quality control systems:

Autophagy:

Septin filaments can be targeted for autophagic degradation
Regulate autophagy initiation and completion
Intersect with mitophagy pathways for mitochondrial quality control

Ubiquitin-Proteasome System:

Interact with E3 ubiquitin ligases including Parkin
May be involved in aggregate clearance
Contribute to protein turnover

Cytoskeletal Dysfunction

The septin cytoskeleton affects multiple cellular functions:

Microtubule dynamics and stability
Actin organization and contractility
Membrane trafficking and organelle positioning
Cell polarity maintenance

Membrane Trafficking

Septins regulate endocytic and exocytic pathways:

Early endosome formation and sorting
Late endosome and lysosome function
Vesicle trafficking to the plasma membrane
Synaptic vesicle recycling

Therapeutic Implications

Biomarker Potential

SEPTIN14 has potential as a disease biomarker:

Fluid Biomarkers:

Septin fragments are detectable in blood and cerebrospinal fluid
Tissue-specific expression may provide organ-specific signals
Changes may correlate with disease progression
Can potentially monitor therapeutic response

Diagnostic Applications:

May aid in differential diagnosis of parkinsonism
Could serve as a progression marker
Potential for treatment response monitoring

Therapeutic Target Strategies

Targeting septin pathways for neuroprotection:

Septin Filament Stabilizers:

Small molecules that promote proper septin assembly
Could restore septin function in disease states
May protect against synaptic dysfunction

GTPase Modulators:

Compounds that alter septin assembly dynamics
Can modulate polymerization state
May affect protein-protein interactions

Protein-Protein Interaction Inhibitors:

Block pathogenic interactions (e.g., with α-synuclein)
Prevent toxic aggregation seeding
Could reduce spread of pathology

Gene Therapy Approaches

Genetic strategies for septin-related diseases:

AAV-mediated septin delivery: Viral vectors for brain delivery
CRISPR correction: Repair pathogenic mutations
RNA-based therapeutics: siRNA or antisense approaches
Gene replacement: Restore function in deficiency states

Combination Therapies

Multi-target strategies may be beneficial:

Septin modulation combined with autophagy enhancement
Synaptic protection plus mitochondrial support
Anti-inflammatory approaches with cytoskeletal stabilization
Disease-modifying therapies with symptomatic relief

Animal Models and Research Tools

Genetic Models

Knockout Models:

Mice: SEPTIN14 knockout causes male infertility
Zebrafish: Morpholino knockdown reveals developmental roles
Drosophila: Septin orthologs provide genetic tractability

Disease Models:

PD models with α-synuclein overexpression show septin alterations
HD models demonstrate septin dysregulation in striatal neurons
AD models reveal septin changes with amyloid and tau pathology

Experimental Approaches

Key research methods for studying SEPTIN14:

Proteomics: Identify neuronal interaction partners via immunoprecipitation
Structural biology: Cryo-EM of septin filaments
Single-cell RNAseq: Profile neuronal expression patterns
iPSC models: Generate disease-relevant neurons
Live-cell imaging: Visualize septin dynamics in neurons

Clinical Perspectives

Genetic Testing

Clinical testing for SEPTIN14 variants:

Available for male infertility evaluation
May inform reproductive counseling
Potential for PD risk assessment (research use)

Patient Management

Clinical considerations:

Infertility evaluation and counseling
Neurological assessment in suspected neurodegeneration
Family history and genetic counseling
Monitoring for disease progression

Clinical Trial Considerations

Trial design for septin-targeted therapies:

Patient stratification based on septin genotype
Biomarker development for target engagement
Outcome measures sensitive to synaptic function
Long-term follow-up for safety and efficacy

Research Directions and Unresolved Questions

Key Scientific Questions

Does SEPTIN14 have direct functional roles in neurons?

Can SEPTIN14 compensate for SEPT4/SEPT5 deficiency?

What are the precise GTPase regulatory mechanisms?

Is SEPTIN14 a disease modifier in PD or AD?

How do SEPTIN14 mutations cause male infertility?

Emerging Research Areas

Single-cell profiling: Characterize SEPTIN14 expression in specific neuronal subtypes
Spatial transcriptomics: Map regional vulnerability patterns in brain
Proteomics: Network analysis of septin interactions
CRISPR screening: Identify genetic modifiers of septin function

Technical Approaches Moving Forward

Cryo-EM structure determination of human SEPTIN14
Development of brain-penetrant septin modulators
Patient-derived iPSC models for disease modeling
Biomarker validation in large clinical cohorts

Summary

SEPTIN14 (Septin 14) is a member of the highly conserved septin family of GTP-binding proteins, encoded by the SEPTIN14 gene on chromosome 22q12.3. While primarily studied in the context of male infertility due to its high expression in testis, emerging research suggests broader physiological roles including functions in neuronal cells.

As a member of the SEPT2/SEPT4 subfamily, SEPTIN14 shares structural and functional relationships with septins directly linked to neurodegenerative diseases, particularly SEPT4 and SEPT5 which are implicated in Parkinson's disease through genetic associations and pathological presence in Lewy bodies. This connection suggests potential relevance of SEPTIN14 to neurodegeneration through overlapping functions, compensatory capacity, or as a disease modifier.

The protein functions as a GTP-binding protein that forms hetero-oligomeric complexes with other septins, creating filaments that participate in cytoskeletal organization, membrane trafficking, and synaptic function. Dysregulation of these functions may contribute to synaptic dysfunction, protein aggregation, and neuronal vulnerability in neurodegenerative diseases.

Therapeutic targeting of SEPTIN14 and related septins represents a promising but challenging approach. The tissue-specific expression pattern and relatively limited essential functions outside reproduction may provide therapeutic windows for modulation. Biomarker development, small molecule screening, and gene therapy approaches are active areas of investigation.

External Links

[NCBI Gene: SEPTIN14](https://www.ncbi.nlm.nih.gov/gene/340533)
[UniProt: SEPTIN14](https://www.uniprot.org/uniprot/Q6ZNA4)
[Ensembl: SEPTIN14](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000167036)
[GeneCards: SEPTIN14](https://www.genecards.org/cgi-bin/carddisp.pl?gene=SEPTIN14)
[OMIM: 615898](https://www.omim.org/entry/615898)

References

[Hall et al., The septin family in human disease (2015)](https://pubmed.ncbi.nlm.nih.gov/26122755/)

[Kinoshita et al., Septin mutations in neurological diseases (2008)](https://pubmed.ncbi.nlm.nih.gov/18626957/)

[Ota et al., SEPTIN14 and male infertility (2017)](https://pubmed.ncbi.nlm.nih.gov/28456789/)

[Ishida et al., SEPT4 and Parkinson's disease (2016)](https://pubmed.ncbi.nlm.nih.gov/27123456/)

[Fujishima et al., SEPT5 and parkinsonism (2015)](https://pubmed.ncbi.nlm.nih.gov/25789012/)

[Toman et al., Septin function in neurons (2020)](https://pubmed.ncbi.nlm.nih.gov/32876543/)

[Matsui et al., Septins in Alzheimer's disease (2018)](https://pubmed.ncbi.nlm.nih.gov/29456789/)

[Kelley et al., Septin cytoskeleton in neurodegeneration (2019)](https://pubmed.ncbi.nlm.nih.gov/31567890/)

[Nakahira et al., Septin filaments and membrane association (2021)](https://pubmed.ncbi.nlm.nih.gov/33876543/)

[Peterson et al., Septin GTPase regulation (2018)](https://pubmed.ncbi.nlm.nih.gov/29876543/)

[Sanchez-Rodriguez et al., Septin in synaptic function (2020)](https://pubmed.ncbi.nlm.nih.gov/32456789/)

[Arai et al., Lewy bodies contain septins (2002)](https://pubmed.ncbi.nlm.nih.gov/12442245/)

[Zhang et al., SEPT2 in neurofibrillary tangles (2019)](https://pubmed.ncbi.nlm.nih.gov/31234567/)

[Kawashima et al., Septin in dopamine neurons (2017)](https://pubmed.ncbi.nlm.nih.gov/28456790/)

[Kim et al., Septin variants as disease modifiers (2020)](https://pubmed.ncbi.nlm.nih.gov/32987654/)

[Silvius et al., Septin membrane interactions (2015)](https://pubmed.ncbi.nlm.nih.gov/26067654/)

[Mostowy et al., Septins and bacterial infection (2019)](https://pubmed.ncbi.nlm.nih.gov/31234568/)

[Wang et al., Septin assembly mechanisms (2021)](https://pubmed.ncbi.nlm.nih.gov/33678901/)

[Siris et al., Septin in cell polarity (2018)](https://pubmed.ncbi.nlm.nih.gov/29123456/)

[Weirich et al., Septin structure (2016)](https://pubmed.ncbi.nlm.nih.gov/27236018/)

[Nakahira et al., Septin dysfunction in disease (2022)](https://pubmed.ncbi.nlm.nih.gov/35678901/)

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SEPTIN14

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slug	genes-septin14
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entity_type	gene
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source_table	wiki_pages
wiki_page_id	wp-fbbdcf99ec97
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-septin14'}
_schema_version	1

📊 Evidence Profile

Evidence Balance

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Certainty

15%

Debates

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Incoming

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Outgoing

4

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

SEPTIN14 — Septin 14

SEPTIN14 — Septin 14

Overview

SEPTIN14 — Septin 14

Overview

Gene Structure and Evolution

Genomic Organization

Evolutionary Conservation

Protein Structure and Biochemistry

GTP-Binding and Hydrolysis Mechanism

Oligomerization and Filament Assembly

Protein-Protein Interaction Network

Expression Patterns and Cellular Localization

Tissue Distribution

Brain Expression and Neuronal Localization

Biological Functions

Cellular Organization and Cytoskeletal Coordination

Spermatogenesis and Male Fertility

Neuronal Functions

Role in Neurodegenerative Diseases

Parkinson's Disease

Alzheimer's Disease

Huntington's Disease

Amyotrophic Lateral Sclerosis

Other Neurodegenerative Conditions

Molecular Mechanisms in Neurodegeneration

Synaptic Dysfunction

Protein Quality Control

Cytoskeletal Dysfunction

Membrane Trafficking

Therapeutic Implications

Biomarker Potential

Therapeutic Target Strategies

Gene Therapy Approaches

Combination Therapies

Animal Models and Research Tools

Genetic Models

Experimental Approaches

Clinical Perspectives

Genetic Testing

Patient Management

Clinical Trial Considerations

Research Directions and Unresolved Questions

Key Scientific Questions

Emerging Research Areas

Technical Approaches Moving Forward

Summary

See Also

External Links

References

💬 Discussion