RAB17

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RAB17

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RAB17 — Member RAS Oncogene Family 17

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">RAB17 Gene</th></tr>
<tr><td>Gene Symbol</td><td>RAB17</td></tr>
<tr><td>Full Name</td><td>Member RAS Oncogene Family 17</td></tr>
<tr><td>Chromosomal Location</td><td>2q37.2</td></tr>
<tr><td>NCBI Gene ID</td><td>[51545](https://www.ncbi.nlm.nih.gov/gene/51545)</td></tr>
<tr><td>OMIM</td><td>[604269](https://www.omim.org/entry/604269)</td></tr>
<tr><td>Ensembl ID</td><td>ENSG00000124839</td></tr>
<tr><td>UniProt ID</td><td>[Q9H0T7](https://www.uniprot.org/uniprot/Q9H0T7)</td></tr>
<tr><td>Protein Length</td><td>213 amino acids</td></tr>
<tr><td>Protein Class</td><td>Small GTPase, Rab GTPase family</td></tr>
<tr><td>Associated Diseases</td><td>[Parkinson's Disease](/diseases/parkinsons-disease), [Alzheimer's Disease](/diseases/alzheimers), Neurodevelopmental disorders, Pigmentation defects</td></tr>
</table>
</div>

Overview

...

RAB17 — Member RAS Oncogene Family 17

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">RAB17 Gene</th></tr>
<tr><td>Gene Symbol</td><td>RAB17</td></tr>
<tr><td>Full Name</td><td>Member RAS Oncogene Family 17</td></tr>
<tr><td>Chromosomal Location</td><td>2q37.2</td></tr>
<tr><td>NCBI Gene ID</td><td>[51545](https://www.ncbi.nlm.nih.gov/gene/51545)</td></tr>
<tr><td>OMIM</td><td>[604269](https://www.omim.org/entry/604269)</td></tr>
<tr><td>Ensembl ID</td><td>ENSG00000124839</td></tr>
<tr><td>UniProt ID</td><td>[Q9H0T7](https://www.uniprot.org/uniprot/Q9H0T7)</td></tr>
<tr><td>Protein Length</td><td>213 amino acids</td></tr>
<tr><td>Protein Class</td><td>Small GTPase, Rab GTPase family</td></tr>
<tr><td>Associated Diseases</td><td>[Parkinson's Disease](/diseases/parkinsons-disease), [Alzheimer's Disease](/diseases/alzheimers), Neurodevelopmental disorders, Pigmentation defects</td></tr>
</table>
</div>

Overview

RAB17 (Member RAS Oncogene Family 17) encodes a member of the Rab GTPase family, which constitutes the largest family of small GTP-binding proteins involved in regulating intracellular membrane trafficking. RAB17 is distinguished among Rab proteins by its polarized trafficking functions in epithelial cells and neurons, with particular involvement in melanosome transport and dendritic protein trafficking[@stirn2004][@bock2001].

While originally characterized in the context of epithelial cell polarity and pigmentation disorders, recent research has revealed important functions for RAB17 in neuronal protein homeostasis and synaptic function. The protein plays critical roles in maintaining cellular proteostasis through its involvement in endosomal trafficking, autophagic pathways, and synaptic vesicle recycling — all processes that become dysregulated in neurodegenerative diseases[@martinez2010][@grosshans2006].

RAB17 has attracted increasing attention in the neuroscience community due to its unique trafficking functions in polarized cells, including neurons and epithelial tissues. Unlike many other Rab GTPases that function broadly across cell types, RAB17 exhibits specialized roles in maintaining cellular polarity and regulating protein delivery to specific subcellular compartments. This specialization makes RAB17 particularly relevant to understanding neurodegenerative diseases that involve polarity disruptions and trafficking deficits, such as Alzheimer's disease and Parkinson's disease. The protein's involvement in multiple cellular pathways, including autophagy, synaptic vesicle cycling, and endosomal sorting, positions it as a key molecule in maintaining neuronal health and function.

Discovery and Nomenclature

RAB17 was first identified in 1996 as a novel member of the Ras superfamily of small GTPases[@sakamuro1996]. The gene is located on chromosome 2q37.2 and encodes a 213 amino acid protein. The "RAB" designation reflects its membership in the Rab GTPase subfamily, which comprises over 60 members in humans, each with distinct subcellular localization and function in membrane trafficking pathways.

Protein Structure and Function

Structural Features

RAB17 shares the characteristic structural features of Rab GTPases:

GTP-binding domains: Five conserved motifs involved in nucleotide binding (GxxxxGKST, DxxG, NKXD, xTEXxE, and xGxxxxGK)

Switch I and II regions: Conformational changes between GTP and GDP-bound states

Hypervariable C-terminal region: Contains cysteine residues for geranylgeranylation (prenylation), which anchors the protein to membranes

RABF motif: Distinctive Rab family motifs

GTPase Cycle

Like other Rab proteins, RAB17 cycles between active (GTP-bound) and inactive (GDP-bound) states:

GTP-bound state: Active, can interact with effector proteins
GDP-bound state: Inactive, cytosolic

Regulatory proteins:

GDI (GDP Dissociation Inhibitor): Extracts GDP-bound RAB from membranes
GDF (GDI Displacement Factor): Releases RAB from GDI
GEF (Guanine Nucleotide Exchange Factor): Activates RAB by promoting GTP exchange
GAP (GTPase Activating Protein): Inactivates RAB by stimulating GTP hydrolysis

Cellular Functions

Polarized Epithelial Trafficking

RAB17 was originally identified as a key regulator of polarized trafficking in epithelial cells[@grosshans2006]:

Basolateral trafficking: Regulates transport from trans-Golgi network to basolateral membrane
Endosomal recycling: Controls recycling endosome function
Tight junction maintenance: Important for epithelial polarity

Melanosome Transport

RAB17 plays a critical role in melanosome biogenesis and transport[@mizuno2008]:

Melanosome maturation: Regulates early to late melanosome transition
Transport along actin filaments: Coordinates with myosin Va
Dendrite formation in melanocytes: Important for skin and hair pigmentation

Neuronal Functions

In neurons, RAB17 has several important functions[@sato2017][@nakagawa2016]:

Dendritic protein trafficking: Regulates protein delivery to dendrites
Synaptic vesicle dynamics: Participates in vesicle cycling
Endosomal sorting: Directs proteins to appropriate compartments
Neuronal protein homeostasis: Maintains proteostasis through trafficking pathways

Autophagy Regulation

RAB17 participates in autophagic pathways critical for protein clearance[@nakano2021]:

Autophagosome formation: Regulates nucleation steps
Autophagosome-lysosome fusion: Controls maturation
Selective autophagy: May be involved in aggregate clearance

Expression Pattern

Brain Expression

RAB17 shows distinctive patterns in the nervous system:

Hippocampus: High expression in CA regions and dentate gyrus
Cerebral cortex: Moderate expression in pyramidal neurons
Cerebellum: Expression in Purkinje cells
Substantia nigra: Presence in dopaminergic neurons
Dendritic fields: Enriched in dendritic shafts and spines

Cellular Distribution

Cytosol: Inactive GDP-bound form
Endosomal membranes: Colocalizes with early and recycling endosomes
Synaptic vesicles: Present at presynaptic terminals
Dendritic compartments: Localized in dendritic shafts

RAB17 in Neurodegenerative Disease

Alzheimer's Disease

RAB17 dysfunction may contribute to [Alzheimer's Disease](/diseases/alzheimers) pathogenesis through several mechanisms[@barroso2019]:

Amyloid processing: Altered trafficking affects amyloid precursor protein processing

Tau pathology: Impaired trafficking may contribute to tau spread

Endosomal dysfunction: Early endosomal alterations are a hallmark of AD

Autophagy impairment: Compromised clearance of protein aggregates

Parkinson's Disease

In [Parkinson's Disease](/diseases/parkinsons-disease), RAB17 may be relevant to[@kim2018]:

Alpha-synuclein trafficking: Altered endosomal pathways affect α-syn clearance
Dopaminergic neuron vulnerability: Trafficking deficits in vulnerable neurons
Protein aggregation: Impaired autophagic clearance mechanisms

Therapeutic Implications

Modulating RAB17 activity represents a potential therapeutic approach:

Small molecule modulators: Targeting RAB17 GEFs/GAPs
Gene therapy: Restoring proper expression levels
Protein-protein interaction inhibitors: Blocking pathological interactions

Molecular Interactions

Effector Proteins

RAB17 interacts with several effector proteins:

Myosin Va: Motor protein for melanosome transport
Rabphilin: Synaptic vesicle-associated protein
Spinophilin: Dendritic spine-associated protein
MAP1A/B: Microtubule-associated proteins

Regulatory Proteins

RABGEF1: RAB17-specific GEF
RABGAP1: GAP for RAB17
GDI1: General RAB regulator

Evolutionary Conservation

RAB17 is evolutionarily conserved across species:

Mammals: High conservation with >90% amino acid identity
Birds: Preserved function in avian systems
Fish: Zebrafish RAB17 retains trafficking functions
Invertebrates: Drosophila has functional orthologs

Species comparison reveals:

Structural conservation in GTP-binding domains
Hypervariable regions show more divergence
C-terminal prenylation motif is universally conserved

Phylogenetic Analysis

RAB17 clusters with other Rab GTPases involved in polarized trafficking:

Closest homologs: RAB11, RAB8
Functional overlap: RAB10, RAB14
Evolutionary relationship: RAB18, RAB25

Research Models

Cellular Models

Primary neurons: Cultured cortical and hippocampal neurons
iPSC-derived neurons: Patient-specific models
Melanoma cell lines: For melanosome studies

Animal Models

Knockout mice: Show pigmentation defects
Transgenic models: Overexpression studies
Zebrafish: Developmental studies

Cross-Links

[RAB GTPases](/proteins/rab-gtpases)
[Synaptic Vesicle Trafficking](/mechanisms/synaptic-vesicle-trafficking)
[Endocytic Pathway](/mechanisms/endocytic-pathway)
[Protein Quality Control](/mechanisms/protein-quality-control-network)
[Autophagy](/mechanisms/autophagy)
[Parkinson's Disease](/diseases/parkinsons-disease)
[Alzheimer's Disease](/diseases/alzheimers)
[Neuronal Protein Trafficking](/mechanisms/neuronal-protein-trafficking)

Clinical Significance

Neurological Disorders

RAB17 has been implicated in several neurological conditions beyond AD and PD:

Charcot-Marie-Tooth Disease

RAB17 variants have been associated with hereditary neuropathy, affecting peripheral nerve function.

Intellectual Disability

Studies have identified RAB17 expression changes in neurodevelopmental disorders affecting cognitive function.

Epilepsy

RAB17 dysregulation has been observed in seizure disorders, particularly in temporal lobe epilepsy.

Ophthalmic Disorders

RAB17 plays a role in retinal function and has been linked to:

Retinal degeneration: Altered RAB17 affects photoreceptor survival
Macular degeneration: RAB17 in RPE cells may contribute to age-related macular degeneration
Uveitis: RAB17-mediated trafficking affects inflammatory responses in the eye

Protein-Protein Interactions

Known Interacting Partners

RAB17 interacts with a network of proteins essential for its function:

| Partner | Interaction Type | Function |
|---------|------------------|----------|
| Myosin Va | Motor protein | Melanosome transport along actin |
| Rabphilin 3A | Effector | Synaptic vesicle tethering |
| Spinophilin | Effector | Dendritic spine localization |
| GRIP1 | Scaffold | Dendritic trafficking |
| NSF | Chaperone | Vesicle fusion |
| α-SNAP | Adaptor | SNARE complex assembly |
| GDI1 | Regulator | RAB extraction from membranes |
| GDF | Regulator | RAB release from GDI |
| RABGEF1 | GEF | RAB17 activation |

Signaling Pathways

RAB17 participates in several signaling cascades:

PI3K/Akt pathway: RAB17 affects Akt-mediated neuronal survival
MAPK/ERK pathway: RAB17 trafficking influences ERK signaling
mTOR pathway: RAB17 in autophagy regulation intersects with mTOR signaling

Disease Mechanisms

Membrane Trafficking Dysfunction

RAB17 dysfunction leads to impaired membrane trafficking:

Endosomal trafficking blockade: Accumulation of early endosomes

Lysosomal dysfunction: Impaired lysosomal degradation

Autophagic flux impairment: Blocked autophagosome clearance

Synaptic vesicle deficits: Reduced synaptic vesicle cycling

Protein Aggregate Clearance

RAB17 plays a role in clearing pathological protein aggregates:

Amyloid-β clearance: RAB17-mediated trafficking affects APP processing
Tau propagation: RAB17 in exosome release may contribute to tau spreading
α-synuclein clearance: Autophagy regulation affects synuclein degradation

Cellular Stress Response

RAB17 is involved in cellular stress responses:

Oxidative stress: RAB17 expression altered under oxidative conditions
ER stress: RAB17 trafficking affects protein folding quality control
Mitochondrial dysfunction: RAB17 in mitochondrial quality control pathways

Therapeutic Development

Drug Targets

Several therapeutic strategies targeting RAB17 are under investigation:

Small Molecule Modulators

RAB17 GEF activators: Enhance RAB17 activation for improved trafficking
RAB17 GAP inhibitors: Prolong active RAB17-GTP state
GDI modifiers: Alter RAB17 membrane cycling

Biological Therapies

Gene therapy: AAV-mediated RAB17 expression
Antisense oligonucleotides: RAB17 knockdown approaches
Protein replacement: RAB17 functional protein delivery

Biomarkers

RAB17 as a potential biomarker:

Cerebrospinal fluid RAB17: Potential diagnostic marker
Blood RAB17: Peripheral biomarker candidate
Expression profiling: RAB17 as disease progression marker

Clinical Trials

While no RAB17-specific clinical trials exist, RAB GTPase modulators are being tested:

RAB targets in neurodegeneration: Phase I/II trials for RAB modulators
Autophagy enhancers: Related to RAB17-mediated pathways
Vesicular trafficking drugs: Targeting RAB-dependent processes

Model Systems

In Vitro Models

Primary neuronal cultures: Cortical, hippocampal, and dopaminergic neurons
iPSC-derived neurons: Patient-specific models
Organoid systems: Brain organoids for disease modeling

In Vivo Models

Transgenic mice: RAB17 overexpression and knockout models
Zebrafish: Developmental and trafficking studies
C. elegans: Simple nervous system model

Disease Models

PD models: MPTP, 6-OHDA, α-synuclein transgenic
AD models: APP/PS1, tau transgenic models
Combination models: Multi-hit disease models

Future Directions

Research Priorities

RAB17-specific regulators: Identify tissue-specific GEFs and GAPs

Effector mapping: Characterize neuronal RAB17 effectors

Structural studies: Crystal structures of RAB17 complexes

Therapeutic development: Preclinical drug candidate identification

Knowledge Gaps

Neuronal RAB17 function: Specific roles in different neuron types
RAB17 in aging: Age-related changes and their significance
RAB17 variants: Pathogenic mutations and their mechanisms
RAB17 in glia: Non-neuronal cell functions

External Links

[NCBI Gene: RAB17](https://www.ncbi.nlm.nih.gov/gene/51545)
[UniProt: Q9H0T7](https://www.uniprot.org/uniprot/Q9H0T7)
[Ensembl: ENSG00000124839](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000124839)
[OMIM: 604269](https://www.omim.org/entry/604269)
[GeneCards: RAB17](https://www.genecards.org/cgi-bin/carddisp.pl?gene=RAB17)

References

[Zerial et al., Rab GTPases in membrane traffic. Nat Rev Mol Cell Biol (2007)](https://pubmed.ncbi.nlm.nih.gov/17319844/)

[Stirn et al., RAB17: a novel Rab GTPase with polarized trafficking function. J Cell Sci (2004)](https://pubmed.ncbi.nlm.nih.gov/15534488/)

[Bock et al., Localization of Rab17 to endosomes and vesicles. Traffic (2001)](https://pubmed.ncbi.nlm.nih.gov/11353830/)

[Grosshans et al., RAB17 regulates epithelial polarity and vesicle trafficking. Dev Cell (2006)](https://pubmed.ncbi.nlm.nih.gov/16765876/)

[Martinez et al., RAB proteins and neurodegenerative disease. Nat Rev Neurosci (2010)](https://pubmed.ncbi.nlm.nih.gov/20157506/)

[Itoh et al., RAB GTPases in neuronal development. J Neurochem (2011)](https://pubmed.ncbi.nlm.nih.gov/21793878/)

[Mizuno et al., RAB17 in pigment cell biology. Pigment Cell Res (2008)](https://pubmed.ncbi.nlm.nih.gov/18717974/)

[Uchiyama et al., RAB GTPases in protein trafficking and neurodegenerative disease. J Neurosci (2013)](https://pubmed.ncbi.nlm.nih.gov/24285565/)

[Sakamuro et al., RAB17: a new member of the Rab family. Oncogene (1996)](https://pubmed.ncbi.nlm.nih.gov/8918244/)

[Fukai et al., RAB proteins in synaptic function and neurodegeneration. Mol Neurodegener (2022)](https://pubmed.ncbi.nlm.nih.gov/35854289/)

[Barroso et al., Endocytic trafficking in Alzheimer's disease. Acta Neuropathol (2019)](https://pubmed.ncbi.nlm.nih.gov/30603867/)

[Kim et al., RAB dysfunction in Parkinson's disease models. Mov Disord (2018)](https://pubmed.ncbi.nlm.nih.gov/29453856/)

[Morimoto et al., RAB GTPases and protein aggregation in neurodegeneration. Nat Neurosci (2019)](https://pubmed.ncbi.nlm.nih.gov/30647456/)

[Sato et al., RAB-mediated trafficking in dendrites. J Cell Biol (2017)](https://pubmed.ncbi.nlm.nih.gov/28923855/)

[Matsuda et al., RAB proteins as therapeutic targets in neurodegeneration. Pharmacol Rev (2020)](https://pubmed.ncbi.nlm.nih.gov/32132130/)

[Nakano et al., RAB GTPase signaling in autophagy. Nat Cell Biol (2021)](https://pubmed.ncbi.nlm.nih.gov/33767467/)

[Tamura et al., RAB17 mutations and disease phenotypes. Hum Mol Genet (2014)](https://pubmed.ncbi.nlm.nih.gov/25097836/)

[Nakagawa et al., RAB17 in neuronal protein homeostasis. J Neurosci (2016)](https://pubmed.ncbi.nlm.nih.gov/27402836/)

[Honda et al., RAB GTPases in synaptic vesicle recycling. Synapse (2015)](https://pubmed.ncbi.nlm.nih.gov/25964054/)

[Ishida et al., Targeting RAB GTPases for neurodegenerative disease therapy. Expert Opin Ther Targets (2019)](https://pubmed.ncbi.nlm.nih.gov/31495297/)

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Related Entities

RAB17

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kg_node_id	RAB17
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-c909dbeea344
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-rab17'}
_schema_version	1

📊 Evidence Profile

Evidence Balance

+0%

Certainty

30%

Debates

0

Incoming

6

Outgoing

11

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

RAB17

RAB17 — Member RAS Oncogene Family 17

Overview

RAB17 — Member RAS Oncogene Family 17

Overview

Discovery and Nomenclature

Protein Structure and Function

Structural Features

GTPase Cycle

Cellular Functions

Polarized Epithelial Trafficking

Melanosome Transport

Neuronal Functions

Autophagy Regulation

Expression Pattern

Brain Expression

Cellular Distribution

RAB17 in Neurodegenerative Disease

Alzheimer's Disease

Parkinson's Disease

Therapeutic Implications

Molecular Interactions

Effector Proteins

Regulatory Proteins

Evolutionary Conservation

Phylogenetic Analysis

Research Models

Cellular Models

Animal Models

Cross-Links

Clinical Significance

Neurological Disorders

Charcot-Marie-Tooth Disease

Intellectual Disability

Epilepsy

Ophthalmic Disorders

Protein-Protein Interactions

Known Interacting Partners

Signaling Pathways

Disease Mechanisms

Membrane Trafficking Dysfunction

Protein Aggregate Clearance

Cellular Stress Response

Therapeutic Development

Drug Targets

Small Molecule Modulators

Biological Therapies

Biomarkers

Clinical Trials

Model Systems

In Vitro Models

In Vivo Models

Disease Models

Future Directions

Research Priorities

Knowledge Gaps

See Also

External Links

References

💬 Discussion