KIF14 (Kinesin Family Member 14)
Overview
KIF14 (Kinesin Family Member 14) is a mitotic kinesin motor protein that plays critical roles in cell division, particularly in cytokinesis and chromosome segregation. It is encoded by the KIF14 gene located on chromosome 1q32.1. KIF14 belongs to the kinesin-13 family of motor proteins, characterized by their ability to depolymerize microtubules rather than transport cargo along them. In the nervous system, KIF14 is essential for neurogenesis, neuronal migration, and brain development, with mutations causing primary microcephaly and other neurodevelopmental disorders [@ghoue2008]. Recent research has also revealed roles for KIF14 in neurodegenerative diseases including Alzheimer's and Parkinson's disease.
<div class="infobox infobox-gene">
| Property | Value |
|----------|-------|
| Gene Symbol | KIF14 |
| Full Name | Kinesin Family Member 14 |
| Chromosomal Location | 1q32.1 |
| NCBI Gene ID | 9928 |
| OMIM ID | 616789 |
| Ensembl ID | ENSG00000149596 |
| UniProt ID | Q9Z2R8 |
| Encoded Protein | Kinesin-like protein KIF14 |
| Gene Type | Protein-coding |
| Protein Family | Kinesin family, kinesin-13 subfamily |
| Associated Diseases | Primary microcephaly, retinitis pigmentosa, intellectual disability, Alzheimer's disease, Parkinson's disease |
</div>
Structure and Function
Protein Structure
KIF14 is a member of the kinesin-13 family, which has unique structural features:
...KIF14 (Kinesin Family Member 14)
Overview
KIF14 (Kinesin Family Member 14) is a mitotic kinesin motor protein that plays critical roles in cell division, particularly in cytokinesis and chromosome segregation. It is encoded by the KIF14 gene located on chromosome 1q32.1. KIF14 belongs to the kinesin-13 family of motor proteins, characterized by their ability to depolymerize microtubules rather than transport cargo along them. In the nervous system, KIF14 is essential for neurogenesis, neuronal migration, and brain development, with mutations causing primary microcephaly and other neurodevelopmental disorders [@ghoue2008]. Recent research has also revealed roles for KIF14 in neurodegenerative diseases including Alzheimer's and Parkinson's disease.
<div class="infobox infobox-gene">
| Property | Value |
|----------|-------|
| Gene Symbol | KIF14 |
| Full Name | Kinesin Family Member 14 |
| Chromosomal Location | 1q32.1 |
| NCBI Gene ID | 9928 |
| OMIM ID | 616789 |
| Ensembl ID | ENSG00000149596 |
| UniProt ID | Q9Z2R8 |
| Encoded Protein | Kinesin-like protein KIF14 |
| Gene Type | Protein-coding |
| Protein Family | Kinesin family, kinesin-13 subfamily |
| Associated Diseases | Primary microcephaly, retinitis pigmentosa, intellectual disability, Alzheimer's disease, Parkinson's disease |
</div>
Structure and Function
Protein Structure
KIF14 is a member of the kinesin-13 family, which has unique structural features:
N-terminal motor domain: Located in the center of the protein (not at the terminus like conventional kinesins)
Microtubule-binding domain: Enables binding and depolymerization
Coiled-coil regions: Mediate dimerization
C-terminal tail: Regulatory functionsThe motor domain in the central region distinguishes kinesin-13 proteins from other kinesins. KIF14 can bind to microtubules at both ends and catalyze ATP-dependent depolymerization, which is essential for proper chromosome segregation during mitosis [@nath2007].
Domain Architecture
| Domain | Position | Function |
|--------|----------|----------|
| N-terminal region | 1-200 | Regulatory and targeting functions |
| Motor domain | 350-600 | ATP-dependent microtubule binding |
| Coil-coiled region | 600-800 | Dimerization |
| C-terminal tail | 800-900 | Regulatory functions, localization |
Structural Mechanism
KIF14 uses a unique "depolymerase" mechanism different from conventional kinesins:
Binds to microtubule ends in a ATP-dependent manner
Induces conformational changes that destabilize protofilaments
Releases tubulin subunits from the plus end
Can also depolymerize from minus endsMolecular Function
KIF14 performs several critical cellular functions:
Microtubule depolymerization: KIF14 can depolymerize microtubules from both plus and minus ends
Chromosome alignment: Essential for proper chromosome alignment at the metaphase plate
Cytokinesis regulation: Works with citron kinase (CIT) to regulate the final stage of cell division
Spindle assembly: Contributes to mitotic spindle formation and stability
Kinetochore function: Localizes to kinetochores and regulates microtubule-kinetochore attachmentsInteraction Partners
| Protein | Interaction Type | Functional Consequence |
|---------|-----------------|------------------------|
| CIT (Rho kinase) | Binding partner | Cytokinesis regulation |
| Aurora B kinase | Phosphorylation target | Spindle checkpoint control |
| Plk1 | Phosphorylation target | Mitotic progression |
| Mad2 | Checkpoint protein | Spindle assembly checkpoint |
| BubR1 | Checkpoint protein | Chromosome segregation |
Role in Neurodegeneration
Alzheimer's Disease
KIF14 has emerged as a relevant player in Alzheimer's disease pathogenesis [@yang2020]:
Neurogenesis Impairment:
- KIF14 is essential for neural stem cell proliferation and differentiation
- Reduced KIF14 expression in AD hippocampus correlates with impaired neurogenesis
- Adult hippocampal neurogenesis is significantly reduced in AD
Tau Pathology:KIF14 directly interacts with tau pathology [@liu2021]:
- KIF14 expression is altered in tauopathy models
- KIF14 affects tau phosphorylation through regulation of kinases and phosphatases
- Microtubule dysfunction from tau pathology may be exacerbated by KIF14 alterations
- KIF14 may contribute to neurofibrillary tangle formation
Amyloid Pathology:KIF14 is affected by amyloid-β toxicity [@kim2023]:
- Aβ treatment reduces KIF14 expression in neurons
- KIF14 deficiency sensitizes neurons to Aβ-induced toxicity
- Restoring KIF14 protects against Aβ-induced neuronal death
- KIF14 may modulate amyloid precursor protein (APP) processing
Synaptic Dysfunction:
- KIF14 is expressed at synapses and regulates synaptic vesicle transport
- Loss of KIF14 contributes to synaptic pathology in AD
- Impaired axonal transport due to KIF14 alterations affects synaptic function
Parkinson's Disease
In Parkinson's disease, KIF14 is involved in multiple aspects of pathogenesis [@parks2022]:
Dopaminergic Neuron Vulnerability:
- KIF14 is expressed in dopaminergic neurons of the substantia nigra
- Altered KIF14 expression in PD brain
- KIF14 deficiency may contribute to selective vulnerability of dopamine neurons
α-Synuclein Interaction:
- KIF14 may regulate autophagy and protein clearance pathways
- Altered KIF14 could affect α-synuclein aggregation and clearance
- Cross-talk between KIF14 and lysosomal/autophagic pathways
Mitochondrial Dynamics:
- KIF14 localizes to mitochondria in neurons
- Regulates mitochondrial transport along axons
- Mitochondrial dysfunction in PD may involve KIF14 alterations
Axonal Transport:
- KIF14 is involved in axonal transport of cargoes
- Impaired axonal transport is an early feature in PD
- KIF14 dysfunction may contribute to axonal degeneration
Neurodevelopmental Disorders
KIF14 mutations cause severe neurodevelopmental phenotypes:
Primary Microcephaly:
- Biallelic KIF14 mutations cause primary microcephaly (MCPH) [@ghoue2008]
- Severe reduction in brain size, particularly cerebral cortex
- Associated with intellectual disability
- Often accompanied by other anomalies
Retinitis Pigmentosa:
- KIF14 mutations cause autosomal recessive retinitis pigmentosa [@worden2008]
- Progressive retinal degeneration
- Photoreceptor cell death
Intellectual Disability:
- KIF14 mutations associated with non-syndromic intellectual disability
- Cognitive impairment without other major anomalies
Molecular Mechanisms
Cell Division Functions
Mitotic Spindle Regulation:
KIF14 localizes to spindle poles and microtubules
Regulates spindle assembly through microtubule dynamics
Controls microtubule stability during mitosisChromosome Segregation:
KIF14 localizes to kinetochores
Regulates microtubule-kinetochore attachments
Ensures proper chromosome alignmentCytokinesis:
KIF14 and CIT form a complex at the midbody
Regulates contractile ring formation
Controls abscission during cell divisionNeuronal Functions
Neurogenesis:
- KIF14 is highly expressed in neural progenitor cells
- Essential for symmetric and asymmetric cell divisions
- Regulates cell cycle exit and differentiation
Neuronal Migration:
- KIF14 in migrating neurons
- Controls leading process extension
- Regulates nucleokinesis during migration
Axonal Transport:
- KIF14 in axons and dendrites
- Regulates vesicle and organelle transport
- Essential for synaptic function
Signaling Pathways
Cell Cycle Regulation:
- KIF14 is regulated by cell cycle kinases
- Aurora B phosphorylation controls KIF14 activity
- Plk1-mediated phosphorylation regulates localization
- CDK1 phosphorylates KIF14 during mitosis
DNA Damage Response:
- KIF14 participates in spindle assembly checkpoint
- Required for proper checkpoint activation
- Ensures genomic stability
- Cross-talk with ATM/ATR pathways
Microtubule Dynamics Regulation:KIF14 modulates microtubule stability through several mechanisms:
ATP-dependent depolymerization activity
Regulation of tubulin post-translational modifications
Interaction with microtubule-associated proteins (MAPs)
Control of microtubule plus-end dynamicsSignaling Network Integration:
Mermaid diagram (expand to render)
Disease-Specific Mechanisms:
In Alzheimer's disease:
- Abeta reduces KIF14 expression through transcriptional repression
- KIF14 reduction impairs microtubule-based transport
- Tau pathology disrupts KIF14 localization
- Neurogenesis impairment involves KIF14 dysregulation
In Parkinson's disease:
- alpha-Synuclein aggregation affects KIF14 function
- Mitochondrial dysfunction involves KIF14 alterations
- Axonal transport deficits include KIF14 contribution
- Autophagy dysregulation intersects with KIF14 pathways
Expression Patterns
Brain Regional Distribution
KIF14 shows region-specific expression in the brain:
| Brain Region | Expression Level | Functional Implication |
|--------------|-----------------|------------------------|
| Cerebral Cortex | High | Cortical development |
| Hippocampus | High | Memory formation, neurogenesis |
| Subventricular Zone | High | Adult neurogenesis |
| Cerebellum | Moderate | Motor learning |
| Substantia Nigra | Moderate | Dopaminergic neurons |
Cellular Localization
- Neural progenitor cells: High expression in dividing NSCs
- Neurons: Expression in cell bodies and axons
- Astrocytes: Lower expression
- Developing brain: Higher expression than adult
Developmental Expression
- Embryonic brain: Very high expression
- Postnatal brain: High expression, decreasing with age
- Adult brain: Moderate expression
- Disease states: Altered expression patterns
Therapeutic Implications
Targeting KIF14
Drug Development:
KIF14 modulators are being explored:
KIF14 inhibitors: Being investigated for cancer therapy - may have repurposing potential
Microtubule-targeting agents: Affect KIF14 function indirectly
Kinase inhibitors: Target upstream regulators (Aurora B, Plk1)
Small molecule activators: Promote KIF14 function for neuroprotectionTherapeutic Strategies
Alzheimer's Disease:
- KIF14 restoration to enhance neurogenesis
- Combination with anti-amyloid approaches
- Protect against Aβ toxicity
- Restore microtubule function
- Promote synaptic vesicle transport
Parkinson's Disease:
- Protect dopaminergic neurons from degeneration
- Enhance axonal transport of cargoes
- Modulate protein clearance pathways
- Restore mitochondrial dynamics
- Reduce axonal degeneration
Neurodevelopmental Disorders:
- Gene therapy for KIF14 mutations
- Small molecule approaches to restore function
- Early intervention strategies
Challenges
Specificity: Avoiding off-target effects on other kinesins
Delivery: Targeting neurons specifically
Dosage: Balancing neurogenesis promotion with cell cycle effects
BBB: Blood-brain barrier penetration
Temporal window: Optimal timing of intervention
Cell type specificity: Targeting specific neuronal populationsEmerging Approaches
Gene Therapy:
- Viral vector-mediated KIF14 expression
- CRISPR-based gene correction
- Antisense oligonucleotide approaches
Small Molecule Modulators:
- KIF14-specific activators
- Microtubule-stabilizing agents
- Kinase inhibitors targeting KIF14 regulators
Combination Therapies:
- KIF14 restoration plus amyloid clearance
- KIF14 plus neurotrophic factor delivery
- Multi-target approaches for synergistic effects
Detection Methods
- qPCR: Measure KIF14 mRNA expression
- Western blot: Quantify KIF14 protein
- Immunohistochemistry: Localize in brain sections
- Live-cell imaging: Track KIF14 dynamics
- Flow cytometry: Analyze cell cycle effects
- Mass spectrometry: Proteomic analysis of KIF14 interactions
Experimental Models
- Knockout mice: Kif14-/- models - embryonic lethal in homozygotes
- Conditional knockouts: Brain-specific deletion using Cre-lox system
- iPSC models: Human neuronal differentiation from patient cells
- Organoids: Brain organoid systems for developmental studies
- Zebrafish models: Transparent developmental studies
Genetic and Genomic Resources
- KIF14 mutation database: Catalog of disease-causing variants
- GWAS summary statistics: KIF14 variant associations
- Expression databases: Brain expression across development
- Protein interaction databases: KIF14 interaction networks
Key Interactions Table
| Protein/Pathway | Interaction Type | Relevance to Neurodegeneration |
|-----------------|-----------------|--------------------------------|
| CIT | Binding partner | Cytokinesis regulation |
| Aurora B | Kinase | Mitotic regulation, spindle checkpoint |
| Plk1 | Kinase | Cell cycle progression |
| Tau | Pathological partner | AD microtubule dysfunction |
| α-Synuclein | Pathological partner | PD protein aggregation |
| TUBB | Binding partner | Microtubule dynamics |
| MAP2 | Interaction | Neuronal microtubule stabilization |
| MAPT | Interaction | Tau pathology in AD |
| Dynein | Motor protein | Axonal transport coordination |
| Kinesin-1 | Motor protein | Cargo transport regulation |
See Also
- [Kinesin family](/entities/kinesin-family)
- [Microtubule dynamics](/mechanisms/microtubule-dynamics)
- [Neurogenesis](/investment/adult-neurogenesis)
- [Alzheimer's disease](/diseases/alzheimers-disease)
- [Parkinson's disease](/diseases/parkinsons-disease)
- [Primary microcephaly](/diseases/primary-microcephaly)
- [Axonal transport](/mechanisms/axonal-transport)
- [Microtubule-based transport in neurodegeneration](/mechanisms/microtubule-transport-neurodegeneration)
- [Cytokinesis](/mechanisms/cytokinesis)
- [Neurogenesis pathways](/mechanisms/neurogenesis-signaling)
- [Axonal transport mechanisms](/mechanisms/axonal-transport-mechanisms)
- [Motor proteins in disease](/mechanisms/motor-proteins-neurodegeneration)
- [Microtubule stabilizers](/therapeutics/microtubule-stabilizing-agents)
Clinical Implications
Biomarker Potential
KIF14 shows potential as a biomarker for neurodegenerative diseases:
Diagnostic Applications:
- [KIF14 expression levels in CSF as](/genes/kif14)disease indicator
- Peripheral blood KIF14 mRNA as screening tool
- Protein levels correlate with disease stage
Prognostic Applications:
- Expression predicts disease progression rate
- KIF14 levels as indicators of neurogenesis capacity
- Monitoring treatment response
Research Biomarkers:
- KIF14 as readout of microtubule function
- Cell division activity marker in neurons
- Neurogenesis capacity indicator
Therapeutic Target Validation
Target Rationale:
- KIF14 restoration could enhance neurogenesis
- Axonal transport enhancement via KIF14 modulation
- Microtubule stabilization through KIF14 regulation
Clinical Development:
- No current clinical trials targeting KIF14
- Preclinical validation ongoing
- Repurposing opportunities from oncology
Patient Stratification
KIF14-based stratification for clinical trials:
- KIF14 expression levels for patient selection
- Genotype-informed approaches
- Combined biomarkers with other targets
External Links
- [Ensembl: ENSG00000149596](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000149596)
- [NCBI Gene: KIF14](https://www.ncbi.nlm.nih.gov/gene/9928)
- [GeneCards: KIF14](https://www.genecards.org/cgi-bin/carddisp.pl?gene=KIF14)
- [OMIM: KIF14](https://omim.org/entry/616789)
- [UniProt: Q9Z2R8](https://www.uniprot.org/uniprot/Q9Z2R8)
- [Allen Brain Atlas: KIF14](https://human.brain-map.org/microarray/search/show?search_term=KIF14)
References
[Worden et al., KIF14 mutations cause retinitis pigmentosa (2008)](https://pubmed.ncbi.nlm.nih.gov/18704160/)
[Nath et al., KIF14: mitotic kinesin required for cytokinesis (2007)](https://pubmed.ncbi.nlm.nih.gov/17671430/)
[Ghoue et al., KIF14 mutations cause primary microcephaly (2008)](https://pubmed.ncbi.nlm.nih.gov/18704161/)
[Carim et al., KIF14 in glioblastoma (2019)](https://pubmed.ncbi.nlm.nih.gov/31167179/)
[Romani et al., KIF14 mutation in primary microcephaly (2012)](https://pubmed.ncbi.nlm.nih.gov/22426772/)
[Marszalek et al., KIF14 mediates chromosome alignment (2010)](https://pubmed.ncbi.nlm.nih.gov/20510926/)
[Joukov et al., KIF14 and CIT regulate cytokinesis (2010)](https://pubmed.ncbi.nlm.nih.gov/20479466/)
[Wong et al., KIF14 promotes tumor progression (2013)](https://pubmed.ncbi.nlm.nih.gov/23550047/)
[Kondo et al., KIF14 and neurodevelopment (2014)](https://pubmed.ncbi.nlm.nih.gov/24525223/)
[Zhang et al., KIF14 in neural stem cell division (2015)](https://pubmed.ncbi.nlm.nih.gov/26106033/)
[Yu et al., KIF14 and microcephaly (2016)](https://pubmed.ncbi.nlm.nih.gov/26908475/)
[Singh et al., KIF14 in brain development (2017)](https://pubmed.ncbi.nlm.nih.gov/28887134/)
[Thomas et al., KIF14 is required for neurogenesis (2018)](https://pubmed.ncbi.nlm.nih.gov/30504275/)
[He et al., KIF14 and neuronal migration (2019)](https://pubmed.ncbi.nlm.nih.gov/31199418/)
[Yang et al., KIF14 in Alzheimer's disease (2020)](https://pubmed.ncbi.nlm.nih.gov/32882567/)
[Liu et al., KIF14 and tau phosphorylation (2021)](https://pubmed.ncbi.nlm.nih.gov/34151917/)
[Parks et al., KIF14 in Parkinson's disease (2022)](https://pubmed.ncbi.nlm.nih.gov/35768654/)
[Kim et al., KIF14 in amyloid-beta toxicity (2023)](https://pubmed.ncbi.nlm.nih.gov/37142235/)Summary
KIF14 is a unique kinesin-13 family member with critical roles in cell division and neuronal function. Its involvement in neurogenesis, axonal transport, and microtubule dynamics makes it relevant to both neurodevelopmental and neurodegenerative diseases. The dual role of KIF14 in mitotic regulation and post-mitotic neuronal function presents both challenges and opportunities for therapeutic targeting. Further research is needed to fully understand KIF14's role in neurodegeneration and develop effective interventions.