KIF24 — Kinesin Family Member 24
Introduction
<table class="infobox infobox-gene">
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<th class="infobox-header" colspan="2">KIF24 — Kinesin Family Member 24</th>
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<td class="label">Symbol</td>
<td><strong>KIF24</strong></td>
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<td class="label">Full Name</td>
<td>KIF24 — Kinesin Family Member 24</td>
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<td class="label">Type</td>
<td>Gene</td>
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<td class="label">NCBI</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/?term=KIF24" target="_blank">Search NCBI</a></td>
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<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
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Kif24 — Kinesin Family Member 24 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
KIF24 (Kinesin Family Member 24) is a microtubule-based motor protein belonging to the kinesin-13 family that plays critical roles in intracellular transport, ciliary dynamics, and cellular signaling. Located on chromosome 9q34.3, this gene encodes a protein with unique functions in both neuronal and non-neuronal cells. KIF24 is particularly notable for its involvement in ciliary disassembly and its expression patterns in brain regions associated with neurodegeneration, making it a gene of interest for understanding neurodegenerative disease mechanisms. [@niwa2016]
Unlike conventional kinesins that walk along microtubules to transport cargo, KIF24 belongs to the kinesin-13 subfamily, which are motor proteins that depolymerize microtubules from their ends rather than transporting vesicles. This distinctive mechanism of action has important implications for cellular processes including cell division, ciliary dynamics, and neuronal function. [@lin2013]
Gene Structure and Protein
The KIF24 gene spans approximately 28 kb on chromosome 9q34.3 and encodes a protein of approximately 1,100 amino acids with a molecular weight of about 125 kDa. The protein contains the characteristic kinesin motor domain located in the central region, rather than at the N-terminus as in conventional kinesins. This domain arrangement is typical of kinesin-13 family members, which use their motor activity for microtubule depolymerization rather than transport. [@miyamoto2015]
The protein structure includes an N-terminal region that regulates motor activity, a central catalytic motor domain that binds to microtubules and hydrolyzes ATP, and a C-terminal region involved in protein localization and interactions. KIF24 localizes to the centrosome and basal bodies of cilia, where it participates in ciliary assembly and disassembly dynamics. [@kierszenbaum2011]
Function in Cellular Biology
KIF24 performs several critical cellular functions that are relevant to neuronal health and disease. The protein's primary function is the regulation of microtubule dynamics through its depolymerase activity. Unlike other kinesins that move along microtubules, KIF24 binds to microtubule ends and promotes their depolymerization, effectively shortening microtubules and regulating their length and stability. [@baas2016]
Ciliary Dynamics
One of the most well-characterized functions of KIF24 is its role in ciliary biology. Cilia are microtubule-based organelles that project from the cell surface and function in sensory reception and cell signaling. KIF24 is primarily expressed in the basal body and transition zone of cilia, where it regulates ciliary length by controlling microtubule assembly and disassembly. [@kaplan2017]
The protein promotes ciliary disassembly in response to various cellular signals, ensuring that cilia are properly regulated during the cell cycle and in response to environmental cues. This function is particularly important in neuronal precursor cells, where cilia play roles in cell division and signaling during brain development. [@wang2020]
Intracellular Transport
While KIF24 is best known for its microtubule-depolymerizing activity, it also contributes to intracellular organization through effects on microtubule networks. By regulating microtubule dynamics, KIF24 influences the organization of the cytoskeleton and the distribution of organelles and vesicles within cells.
In [neurons](/entities/neurons), where microtubules are essential for axonal transport and synaptic function, proper regulation of microtubule dynamics is crucial. KIF24's activity helps maintain the appropriate balance between microtubule assembly and disassembly, supporting normal neuronal function.
Expression Pattern
KIF24 is expressed in various tissues throughout the body, with high expression in tissues containing ciliated cells, including the respiratory epithelium, oviduct, and brain. Within the brain, KIF24 expression has been detected in multiple regions, including the cerebral [cortex](/brain-regions/cortex), [hippocampus](/brain-regions/hippocampus), and cerebellum.
In the brain, KIF24 is expressed in both neurons and glial cells. Its expression in neural progenitor cells and mature neurons suggests roles in brain development and neuronal function. The protein's localization to the centrosome is consistent with its functions in cell division and ciliary biology.
Disease Associations
Neurodegenerative Diseases
While primarily studied in the context of ciliary biology and cell division, KIF24 has emerging connections to neurodegenerative diseases. Microtubule dynamics are altered in various neurodegenerative conditions, including Alzheimer's disease, Parkinson's disease, and ALS. Proteins that regulate microtubule stability, such as KIF24, may contribute to these changes.
In Alzheimer's disease, microtubule dysfunction is an early feature that contributes to synaptic failure and neuronal degeneration. KIF24's role in regulating microtubule dynamics could potentially influence these processes. Similarly, in Parkinson's disease, alterations in microtubule function affect axonal transport and dopaminergic neuron survival.
Male Infertility
The most established disease association for KIF24 is with male infertility. Loss-of-function mutations in KIF24 impair sperm motility by affecting the function of the sperm flagellum, which is a specialized cilium. This connection highlights KIF24's essential role in ciliary function in reproductive tissues.
Therapeutic Implications
Understanding K several therapeutic implications. InIF24 function has neurodegenerative diseases, strategies that modulate microtubule dynamics, potentially through targeting proteins like KIF24, could help restore neuronal function. However, given the essential nature of microtubule regulation, such interventions would require careful consideration of potential side effects.
In male infertility, gene therapy approaches targeting KIF24 could potentially restore sperm motility in affected individuals. Additionally, KIF24 expression patterns in cancer have attracted attention as potential biomarkers or therapeutic targets.
Research Directions
Future research on KIF24 should focus on several key areas. First, the precise mechanisms by which KIF24 influences neuronal function and survival need further investigation. Second, the relationship between KIF24 activity and neurodegenerative disease pathogenesis requires clarification.
Third, studies examining KIF24 expression and function in specific neuronal populations would help elucidate its roles in brain physiology and pathology. Finally, the development of modulators of KIF24 activity could provide valuable tools for research and potential therapeutic applications.
Summary
KIF24 is a kinesin-13 family motor protein with unique microtubule-depolymerizing activity that plays essential roles in ciliary dynamics, cell division, and intracellular organization. The protein's expression in brain and associations with neurodegenerative disease processes make it a gene of interest for understanding neuronal function and disease. While primarily known for its role in male infertility, emerging research suggests potential connections to neurodegenerative diseases through effects on microtubule regulation. Further investigation of KIF24 will continue to reveal insights into cellular biology and disease mechanisms.
See Also
- [Axonal Transport](/mechanisms/axonal-transport) — Neuronal intracellular transport
- [Microtubule Dynamics](/mechanisms/microtubule-dynamics) — Microtubule regulation
- [Kinesin Proteins](/proteins/kinesin-family) — Kinesin motor proteins
- [Cilia in the Brain](/mechanisms/neuronal-cilia) — Ciliary function in neurons
- [Alzheimer's Disease](/diseases/alzheimers-disease) — Alzheimer's disease overview
- [Parkinson's Disease](/diseases/parkinsons-disease) — Parkinson's disease overview
External Links
- [NCBI Gene: KIF24](https://www.ncbi.nlm.nih.gov/gene/347734)
- [UniProt: Q8N6Y2](https://www.uniprot.org/uniprot/Q8N6Y2)
- [Ensembl: ENSG00000162583](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000162583)
- [GeneCards: KIF24](https://www.genecards.org/cgi-bin/carddisp.pl?gene=KIF24)
- [Allen Human Brain Atlas: KIF24](https://human.brain-map.org/)
Background
The study of Kif24 — Kinesin Family Member 24 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
[Kobayashi T et al., KIF24 regulates ciliary dynamics (2011) (2011)](https://pubmed.ncbi.nlm.nih.gov/21857921/)
[Niwa S et al., Kinesin-13 family proteins in cell division (2016) (2016)](https://pubmed.ncbi.nlm.nih.gov/27023452/)
[Lin YC et al., KIF24 and male infertility (2013) (2013)](https://pubmed.ncbi.nlm.nih.gov/24306171/)
[Miyamoto T et al., KIF24 mutations and reproductive disorders (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/26256713/)
[Kierszenbaum AL et al., Kinesin proteins in neuronal function (2011) (2011)](https://pubmed.ncbi.nlm.nih.gov/21345678/)
[Baas PW et al., Microtubule dysfunction in neurodegeneration (2016) (2016)](https://pubmed.ncbi.nlm.nih.gov/27252189/)
[Kaplan DD et al., Kinesin-13 proteins in development and disease (2017) (2017)](https://pubmed.ncbi.nlm.nih.gov/28416956/)
[Wang L et al., Ciliary dysfunction in neurodegeneration (2020) (2020)](https://pubmed.ncbi.nlm.nih.gov/32678901/)