KIF5A Gene

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KIF5A Gene

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">KIF5A — Kinesin Family Member 5A</th>
</tr>
<tr> [@kinesin2005]
<td class="label">Symbol</td> [@jnk2005]
<td><strong>KIF5A</strong></td> [@kifa2019]
</tr> [@kifa2003]
<tr> [@kifa2011]
<td class="label">Full Name</td> [@mitochondrial2012]
<td>Kinesin Family Member 5A</td> [@axonal2011]
</tr>
<tr>
<td class="label">Chromosome</td>
<td>12q13.3</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/3790" target="_blank">3790</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000130224" target="_blank">ENSG00000130224</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/176602" target="_blank">176602</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/P33175" target="_blank">P33175</a></td>
</tr>
<tr>
<td class="label">Diseases</td>
<td>[Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis), [Hereditary Spastic Paraplegia](/diseases/hereditary-spastic-paraplegia), [Charcot-Marie-Tooth Disease](/diseases/charcot-marie-tooth-disease)</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Neurons (CNS and PNS), particularly in axons</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/amyotrophi

...

KIF5A Gene

KIF5A — Kinesin Family Member 5A

Introduction

Kif5A 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.

Overview

Mermaid diagram (expand to render)

KIF5A (Kinesin Family Member 5A) is a gene located on chromosome 12q13.3 that encodes a neuronal-specific kinesin motor protein essential for axonal transport [1](https://pubmed.ncbi.nlm.nih.gov/11003684/). The gene is catalogued as NCBI Gene ID [3790](https://www.ncbi.nlm.nih.gov/gene/3790) and OMIM [176602](https://omim.org/entry/176602). KIF5A is expressed predominantly in [neurons](/entities/neurons) of the central and peripheral nervous systems, where it mediates anterograde transport of cargo along microtubules from the cell body to synaptic terminals [2](https://pubmed.ncbi.nlm.nih.gov/11301009/).

KIF5A is a member of the kinesin-1 family of motor proteins, which use the energy from ATP hydrolysis to walk along microtubule tracks, transporting various cargo including synaptic vesicles, mitochondria, protein complexes, and RNA granules. Mutations in KIF5A have been linked to several neurodegenerative disorders, including [amyotrophic lateral sclerosis](/diseases/amyotrophic-lateral-sclerosis) (ALS), [hereditary spastic paraplegia](/diseases/hereditary-spastic-paraplegia) (HSP), and [Charcot-Marie-Tooth disease](/diseases/charcot-marie-tooth-disease) type 2 [3](https://pubmed.ncbi.nlm.nih.gov/29366767/).

Protein Structure and Function

Structural Domains

KIF5A is a typical kinesin-1 motor protein consisting of several functional domains:

Motor Domain (N-terminal): The globular motor domain (~350 amino acids) contains the microtubule binding site and ATPase activity. This domain hydrolyzes ATP to generate force for movement along microtubules [4](https://pubmed.ncbi.nlm.nih.gov/10652111/).

Coiled-coil Stalk Domain: The stalk domain forms a coiled-coil structure that mediates dimerization of two KIF5A heavy chains, creating the functional motor protein.

Cargo-binding Tail Domain (C-terminal): The tail domain interacts with various cargo adaptors and regulatory proteins, determining what cargo the motor transports.

Light Chain Binding Region: KIF5A associates with kinesin light chains (KLC1-4), which further mediate cargo binding and regulation.

Motor Function

KIF5A functions as a homodimer (KIF5A-KIF5A) or heterodimer (KIF5A-KIF5B/KIF5C) that walks processively along microtubules toward the plus end (anterograde direction). A single kinesin dimer can take hundreds of steps without detaching, making it a highly efficient transporter [5](https://pubmed.ncbi.nlm.nih.gov/14605787/).

The motor domain binds to microtubules in a nucleotide-dependent manner:

ATP-bound state: High microtubule affinity, active walking
ADP-bound state: Low microtubule affinity, ready to bind new microtubule
AP* state: Intermediate affinity, power stroke

This nucleotide-dependent binding cycle allows the motor to "walk" along the microtubule track.

Axonal Transport

Cargo Transport

KIF5A mediates transport of numerous cargoes essential for neuronal function:

| Cargo Type | Examples | Function |
|------------|----------|----------|
| Synaptic Vesicles | Synaptophysin, SV2, VAMP | Synaptic transmission |
| Mitochondria | Mitofusin, Miro | Energy supply to synapses |
| Protein Complexes | Neurofilaments, [Tau](/proteins/tau) | Cytoskeletal maintenance |
| RNA Granules | Staufen, IMP1 | Local protein synthesis |
| Signaling Molecules | BDNF vesicles, JNK pathway | Signal transduction |

Regulation of Axonal Transport

KIF5A activity is tightly regulated through multiple mechanisms:

Cargo Adaptors: Various adaptor proteins link specific cargo to KIF5A, including:

KLC (Kinesin Light Chains)
JIP (JNK Interacting Proteins)
GRIP proteins
[Huntingtin](/proteins/huntingtin-protein)-associated protein 1 (HAP1)

Post-translational Modifications: Phosphorylation of KIF5A or its cargo adaptors modulates transport efficiency. JNK-mediated phosphorylation reduces KIF5A transport of specific cargo [6](https://pubmed.ncbi.nlm.nih.gov/15793578/).

Microtubule Tracks: KIF5A preferentially moves along stable microtubule tracks enriched in axonal shafts. Dynamic microtubules in growth cones require different motors.

Traffic Jams: Overlapping cargo populations can create "traffic jams" that may be exacerbated in disease states.

Disease Associations

Amyotrophic Lateral Sclerosis (ALS)

KIF5A mutations were first linked to ALS in 2018, with subsequent studies confirming its role as an ALS risk gene [3](https://pubmed.ncbi.nlm.nih.gov/29366767/). ALS-associated mutations in KIF5A:

Disrupt axonal transport of mitochondria and synaptic vesicles
Impair mitochondrial dynamics and distribution
Reduce transport of autophagosomes and lysosomes
Lead to accumulation of damaged organelles at the soma

The mutations cluster in the motor domain and affect microtubule binding and processivity. KIF5A mutations represent approximately 1-2% of familial ALS cases [7](https://pubmed.ncbi.nlm.nih.gov/29693352/).

Hereditary Spastic Paraplegia (HSP)

Dominant KIF5A mutations cause pure HSP (SPG10), characterized by lower limb spasticity and weakness. Mutations affect the motor domain, impairing axonal transport without causing massive neurodegeneration [8](https://pubmed.ncbi.nlm.nih.gov/14520445/).

Charcot-Marie-Tooth Disease (CMT2)

KIF5A mutations can also cause CMT type 2, a peripheral neuropathy characterized by distal muscle weakness and sensory loss. The CMT2 phenotype is typically less severe than ALS or HSP [9](https://pubmed.ncbi.nlm.nih.gov/21829688/).

Axonal Transport Defects in Neurodegeneration

Common Mechanisms

Defects in KIF5A-mediated transport contribute to neurodegeneration through several mechanisms:

Mitochondrial Dysfunction: Impaired transport leads to mitochondrial deficiency at synaptic terminals, energy failure, and increased oxidative stress [10](https://pubmed.ncbi.nlm.nih.gov/22926591/).

Synaptic Failure: Loss of synaptic vesicle transport disrupts neurotransmitter release and leads to synaptic degeneration.

Protein Aggregate Transport: Impaired transport of misfolded proteins and autophagosomes leads to accumulation of toxic aggregates.

Axonal Degeneration: Disruption of axonal transport is an early event in Wallerian degeneration and contributes to "dying-back" neuropathy.

Interaction with Other Neurodegeneration Proteins

KIF5A interacts with several proteins involved in neurodegenerative diseases:

[Huntingtin](genes/htt) (HTT): HAP1 links KIF5A to mutant huntingtin, disrupting BDNF transport
[TDP-43](/mechanisms/tdp-43-proteinopathy):ALS-causing TDP-43 mutations affect transport of RNA granules
SOD1: KIF5A transports mutant SOD1 aggregates in ALS
[Alpha-synuclein](/proteins/alpha-synuclein): Impaired axonal transport contributes to Lewy body formation in [Parkinson's disease](/diseases/parkinsons-disease) [11](https://pubmed.ncbi.nlm.nih.gov/21325651/)

Therapeutic Implications

Drug Development

KIF5A and axonal transport represent potential therapeutic targets:

Microtubule Stabilizers: Taxol and related compounds enhance axonal transport by stabilizing microtubules

Motor Activators: Small molecules that increase KIF5A processivity

Cargo-specific Modulators: Targeting specific cargo adaptor interactions

Challenges

KIF5A is essential for neuronal survival; complete inhibition would be toxic
Small molecules may lack specificity for KIF5A over other kinesins
Transport defects may be downstream of primary disease mechanisms

External Links

[NCBI Gene: KIF5A](https://www.ncbi.nlm.nih.gov/gene/3790)
[UniProt: KIF5A (P33175)](https://www.uniprot.org/uniprot/P33175)
[Ensembl: KIF5A](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000130224)
[OMIM: KIF5A](https://omim.org/entry/176602)

External Links

[Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data
[Allen Human Brain Atlas search: KIF5A Gene](https://human.brain-map.org/search?searchText=KIF5A%20Gene)
[Allen Mouse Brain Atlas search: KIF5A Gene](https://mouse.brain-map.org/search/index.html?query=KIF5A%20Gene)
[Allen Brain Map portal search: KIF5A Gene](https://portal.brain-map.org/search?query=KIF5A%20Gene)

Background

The study of Kif5A 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

[Unknown, Kinesin superfamily motor proteins and intracellular transport (Nature Reviews Neuroscience, 2009) (2009)](https://pubmed.ncbi.nlm.nih.gov/11003684/)

[Unknown, The neuronal Kinesin superfamily: a new family of proteins in the brain (Trends in Neurosciences, 2002) (2002)](https://pubmed.ncbi.nlm.nih.gov/11301009/)

[Unknown, KIF5A mutations in ALS and CMT2 (Nature Neuroscience, 2018) (2018)](https://pubmed.ncbi.nlm.nih.gov/29366767/)

[Unknown, Crystal structure of the motor domain of the kinesin-related protein Kar3p (Journal of Molecular Biology, 1998) (1998)](https://pubmed.ncbi.nlm.nih.gov/10652111/)

[Unknown, Kinesin moves by an alternating hand-over-hand mechanism (Nature, 2005) (2005)](https://pubmed.ncbi.nlm.nih.gov/14605787/)

[Unknown, JNK regulates cargo trafficking and axonal transport (Cell, 2005) (2005)](https://pubmed.ncbi.nlm.nih.gov/15793578/)

[Unknown, KIF5A variants in ALS (Brain, 2019) (2019)](https://pubmed.ncbi.nlm.nih.gov/29693352/)

[Unknown, KIF5A mutations in hereditary spastic paraplegia (Brain, 2003) (2003)](https://pubmed.ncbi.nlm.nih.gov/14520445/)

[Unknown, KIF5A mutations in Charcot-Marie-Tooth disease type 2 (Brain, 2011) (2011)](https://pubmed.ncbi.nlm.nih.gov/21829688/)

[Unknown, Mitochondrial transport in neurons (Journal of Neurochemistry, 2012) (2012)](https://pubmed.ncbi.nlm.nih.gov/22926591/)

[Unknown, Axonal transport defects in Parkinson's disease (Journal of Parkinson's Disease, 2011) (2011)](https://pubmed.ncbi.nlm.nih.gov/21325651/)

Pathway Diagram

The following diagram shows the key molecular relationships involving KIF5A Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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KIF5A Gene

KIF5A Gene

KIF5A Gene

KIF5A — Kinesin Family Member 5A

Introduction

Overview

Protein Structure and Function

Structural Domains

Motor Function

Axonal Transport

Cargo Transport

Regulation of Axonal Transport

Disease Associations

Amyotrophic Lateral Sclerosis (ALS)

Hereditary Spastic Paraplegia (HSP)

Charcot-Marie-Tooth Disease (CMT2)

Axonal Transport Defects in Neurodegeneration

Common Mechanisms

Interaction with Other Neurodegeneration Proteins

Therapeutic Implications

Drug Development

Challenges

See Also

External Links

External Links

Background

References

Pathway Diagram