RAB6B

RAB6B

<div class="infobox infobox-gene">
<div class="infobox-header">RAB6B</div>

Overview

RAB6B is a human gene whose product Rab6B is a brain-specific isoform of RAB6 that is primarily expressed in [neurons](/entities/neurons). It regulates Golgi-to-ER retrograde transport and is involved in dendritic trafficking of proteins. Rab6B is highly enriched in the brain, particularly in cerebellar Purkinje cells and hippocampal neurons, where it plays essential roles in neuronal protein homeostasis. This page covers the gene's normal function, disease associations, expression patterns, and key research findings relevant to neurodegeneration [@neuronal2019].

RAB6B

<div class="infobox infobox-gene">
<div class="infobox-header">RAB6B</div>

Overview

RAB6B is a human gene whose product Rab6B is a brain-specific isoform of RAB6 that is primarily expressed in [neurons](/entities/neurons). It regulates Golgi-to-ER retrograde transport and is involved in dendritic trafficking of proteins. Rab6B is highly enriched in the brain, particularly in cerebellar Purkinje cells and hippocampal neurons, where it plays essential roles in neuronal protein homeostasis. This page covers the gene's normal function, disease associations, expression patterns, and key research findings relevant to neurodegeneration [@neuronal2019].

<div class="infobox-row"><span class="infobox-label">Full Name</span><span class="infobox-value">RAB6B, Member RAS Oncogene Family</span></div> [@dendritic2021]
<div class="infobox-row"><span class="infobox-label">Chromosome</span><span class="infobox-value">3q21.3</span></div>
<div class="infobox-row"><span class="infobox-label">NCBI Gene ID</span><span class="infobox-value">[51552](https://www.ncbi.nlm.nih.gov/gene/51552)</span></div>
<div class="infobox-row"><span class="infobox-label">OMIM</span><span class="infobox-value">[607059](https://omim.org/entry/607059)</span></div>
<div class="infobox-row"><span class="infobox-label">Ensembl</span><span class="infobox-value">[ENSG00000154917](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000154917)</span></div>
<div class="infobox-row"><span class="infobox-label">UniProt</span><span class="infobox-value">[Q9NRW1](https://www.uniprot.org/uniprot/Q9NRW1)</span></div>
<div class="infobox-row"><span class="infobox-label">Protein</span><span class="infobox-value">Rab6B</span></div>
<div class="infobox-row"><span class="infobox-label">Associated Diseases</span><span class="infobox-value">Alzheimer's Disease, Parkinson's Disease, Amyotrophic Lateral Sclerosis, Cerebellar Ataxia</span></div>
</div>

Function

RAB6B is a brain-specific isoform of RAB6A, with over 90% sequence identity, but with distinct neuronal expression patterns and functions. Like Rab6A, Rab6B regulates Golgi-to-endoplasmic reticulum (ER) retrograde transport, but with specific roles in dendritic trafficking [@rabb2018].

Molecular Function

Rab6B performs several critical neuronal functions:

• Dendritic Protein Trafficking: Rab6B specifically regulates the trafficking of proteins in dendrites, including neurotransmitter receptors and synaptic proteins [@regulation2017]
• Retrograde Transport: Coordinates retrieval of cargo from the Golgi to the ER in neuronal processes
• Synaptic Protein Delivery: Essential for delivering newly synthesized synaptic proteins to [dendritic spines](/mechanisms/dendritic-spines)
• Dendritic Golgi Outposts: Maintains Golgi outposts in dendrites that support local protein synthesis and trafficking [@local2019]

Neuronal Function

In neurons, Rab6B is particularly important for:

• Synaptic Plasticity: Regulates the delivery and turnover of synaptic proteins during [long-term potentiation](/mechanisms/long-term-potentiation) (LTP) and long-term depression (LTD)
• Dendritic Spine Maintenance: Essential for maintaining dendritic spine morphology and function
• Local Protein Synthesis: Supports dendritic protein synthesis through trafficking of translation components
• Neurotransmitter Receptor Trafficking: Regulates the surface expression of AMPA and NMDA receptors [@ampa2020]

Disease Associations

Alzheimer's Disease (AD)

RAB6B is implicated in Alzheimer's disease through several mechanisms [@rabb2021]:

Parkinson's Disease (PD)

In Parkinson's disease, RAB6B plays protective roles [@rabb2022]:

Cerebellar Ataxia

RAB6B mutations have been linked to cerebellar ataxia, highlighting its critical role in Purkinje cell function [@rabb2020].

Expression

RAB6B exhibits brain-specific expression with highest levels in:

• Cerebellum: Particularly enriched in Purkinje cells
• Hippocampus: High expression in CA1 pyramidal neurons and dentate gyrus granule cells
• Cerebral [Cortex](/brain-regions/cortex): Expressed in layer 2/3 pyramidal neurons
• Olfactory Bulb: Mitral and tufted cells

Therapeutic Implications

RAB6B represents a potential therapeutic target for neurodegenerative diseases [@therapeutic2022]:

Interacting Proteins

Key Rab6B-interacting proteins include:

• p115 (UBL4A): Vesicle tethering factor
• GM130 (GOLGA2): Golgi matrix protein
• GRASP65 (GORASP1): Golgi stacking protein
• Dynein: Motor protein for retrograde transport
• RAB6B-specific effectors: Proteins that specifically interact with the brain-specific isoform

Cross-Links

• [RAB GTPases](/proteins/rab-gtpases)
• [Synaptic Vesicle Trafficking](/mechanisms/synaptic-vesicle-trafficking)
• [Dendritic Trafficking](/mechanisms/dendritic-trafficking)
• [Protein Quality Control](/mechanisms/protein-quality-control-network)
• [Cerebellum](/brain-regions/cerebellum)
• [Hippocampus](/brain-regions/hippocampus)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)

See Also

• [RAB GTPases](/proteins/rab-gtpases)
• [RAB6A Gene](/genes/rab6a)
• [Synaptic Plasticity](/mechanisms/synaptic-plasticity)
• [Dendritic Spine Function](/mechanisms/dendritic-spines)
• [Protein Quality Control](/mechanisms/protein-quality-control-network)

External Links

• [Ensembl: ENSG00000154917](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000154917)
• [NCBI Gene: RAB6B](https://www.ncbi.nlm.nih.gov/gene/51552)
• [UniProt: Q9NRW1](https://www.uniprot.org/uniprot/Q9NRW1)
• [GeneCards: RAB6B](https://www.genecards.org/cgi-bin/carddisp.pl?gene=RAB6B)
• [Allen Brain Atlas: RAB6B](https://human.brain-map.org/microarray/search/show?search_term=RAB6B)

References