RHOT2 Gene

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RHOT2 Gene

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RHOT2 Gene

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">RHOT2 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>RHOT2</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Ras Homolog Family Member T2</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>MIRO2, Miro2, RhoT2</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>12q24.31</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>55103</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000150990</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q8IXI2</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>612606</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>618 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~71 kDa</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>High in brain (substantia nigra), heart, skeletal muscle</td>
</tr>
<tr>
<td class="label">Mechanism</td>
<td>Evidence</td>
</tr>
<tr>
<td class="label">PINK1/Parkin pathway</td>
<td>RHOT2 is phosphorylated by PINK1; essential for mitophagy initiation</td>
</tr>
<tr>
<td class="label">Mitochondrial dysfunction</td>
<td>RHOT2 deficiency leads to mitochondrial transport defects</td>
</tr>
<tr>
<td class="label">Calcium dysregulation</td>
<td>Altered RHOT2 function affects calcium handling in neurons</td>
</tr>

...

RHOT2 Gene

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">RHOT2 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>RHOT2</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Ras Homolog Family Member T2</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>MIRO2, Miro2, RhoT2</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>12q24.31</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>55103</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000150990</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q8IXI2</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>612606</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>618 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~71 kDa</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>High in brain (substantia nigra), heart, skeletal muscle</td>
</tr>
<tr>
<td class="label">Mechanism</td>
<td>Evidence</td>
</tr>
<tr>
<td class="label">PINK1/Parkin pathway</td>
<td>RHOT2 is phosphorylated by PINK1; essential for mitophagy initiation</td>
</tr>
<tr>
<td class="label">Mitochondrial dysfunction</td>
<td>RHOT2 deficiency leads to mitochondrial transport defects</td>
</tr>
<tr>
<td class="label">Calcium dysregulation</td>
<td>Altered RHOT2 function affects calcium handling in neurons</td>
</tr>
<tr>
<td class="label">Genetic evidence</td>
<td>RHOT2 variants associated with PD risk in GWAS studies</td>
</tr>
<tr>
<td class="label">Selective vulnerability</td>
<td>RHOT2 dysfunction particularly affects dopaminergic neurons due to their high energy demands</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Rhot2 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.

RHOT2 (Ras Homolog Family Member T2), also known as MIRO2 (Mitochondrial Rho GTPase 2), is a mitochondrial outer membrane protein that plays a critical role in mitochondrial trafficking, dynamics, and quality control. It is essential for proper mitochondrial function and has been strongly implicated in Parkinson's disease (PD) pathogenesis [@stoffler2006][@weihofen2008].

Gene Information

Normal Function

RHOT2 is a unique GTPase localized to the outer mitochondrial membrane that serves as a molecular hub connecting mitochondrial dynamics with cellular signaling. It belongs to the RGK (Rad, Gem, Kir) family of small GTPases but is distinguished by its mitochondrial localization and specialized functions in neurons [@weihofen2008][@russo2013].

Structure

RHOT2 contains several functional domains:

GTPase domain: N-terminal GTP-binding domain that hydrolyzes GTP and regulates protein activity

EF-hand domains: Two calcium-binding domains that sense mitochondrial calcium levels

Transmembrane region: C-terminal anchor that tethers the protein to the outer mitochondrial membrane

Proline-rich region: Mediates interactions with SH3 domain-containing proteins

This domain architecture allows RHOT2 to integrate multiple signaling inputs and coordinate downstream effects on mitochondrial dynamics [@stoffler2006].

Mitochondrial Transport

RHOT2 serves as a molecular adaptor linking mitochondria to the cytoskeletal motor machinery:

Microtubule-based transport: Interacts with kinesin and dynein motor proteins through Milton adaptor proteins (also known as TRAK1/TRAK2)
Anterograde transport: Facilitates mitochondrial movement from cell body to dendrites/axons
Retrograde transport: Enables return of damaged mitochondria to the soma
Synaptic localization: Critical for mitochondrial positioning at synapses and presynaptic terminals where energy demand is high

The RHOT2-Milton complex forms a molecular bridge between mitochondria and motor proteins, enabling activity-dependent redistribution of mitochondria within neurons [@russo2013][@chang2013].

Mitochondrial Dynamics

RHOT2 regulates both fusion and fission processes:

Mitochondrial fusion: Coordinates mitofusin (MFN1/MFN2)-mediated fusion through direct interactions
Mitochondrial fission: Interacts with DRP1 (Dynamin-1-like protein) to regulate fission events
Morphology maintenance: Balanced fusion/fission is crucial for mitochondrial health and quality control
Cell type specificity: Neuronal mitochondria rely heavily on RHOT2-mediated dynamics due to their unique morphology and energy requirements

Mitophagy

RHOT2 is a critical component of the PINK1/Parkin mitophagy pathway—the same pathway implicated in familial PD:

PINK1 phosphorylation: PINK1 phosphorylates RHOT2 on specific serine residues (particularly Ser156)
Parkin recruitment: Phosphorylated RHOT2 facilitates Parkin recruitment to damaged mitochondria
Ubiquitination: RHOT2 itself can be ubiquitinated by Parkin, enhancing mitophagy
Motor disengagement: Triggers detachment of mitochondria from cytoskeletal motors for autophagic clearance
Autophagosome targeting: Links ubiquitinated mitochondria to the autophagic machinery through LC3 interaction

This pathway is essential for清除 damaged mitochondria in dopaminergic neurons, which have particularly high energy demands and are selectively vulnerable in PD [@saez-atienzar2020][@gomez2024].

Calcium Signaling

The EF-hand domains make RHOT2 a calcium sensor:

Calcium-induced arrest: High calcium levels cause RHOT2 to bind microtubules, arresting mitochondrial transport
Synaptic function: Calcium-dependent mitochondrial positioning at synapses regulates neurotransmitter release
Metabolic coupling: Matches mitochondrial energy production to cellular demand
Pathological implications: Calcium dysregulation in PD may disrupt RHOT2 function, contributing to energy deficits

Disease Associations

Parkinson's Disease

RHOT2 is strongly linked to PD through multiple mechanisms. Loss-of-function mutations in RHOT2 impair mitophagy, leading to accumulation of dysfunctional mitochondria—the hallmark of PD pathogenesis.

Key findings:

PINK1 phosphorylates RHOT2 at Ser156 to initiate mitophagy [@liu2019]
Loss of RHOT2 leads to accumulation of dysfunctional mitochondria
RHOT2 dysfunction particularly affects dopaminergic neurons due to their high energy demands
Studies show reduced RHOT2 expression in PD brains
Mouse models with RHOT2 knockout develop progressive dopaminergic neuron loss

Alzheimer's Disease

Altered mitochondrial trafficking observed in AD models
RHOT2-mediated transport impaired by amyloid-beta toxicity
Calcium dysregulation in AD affects RHOT2 function
May contribute to synaptic energy deficits

Huntington's Disease

RHOT2-mediated transport impaired by mutant huntingtin protein
Altered mitochondrial dynamics in HD models
Potential therapeutic target for preserving neuronal function

Amyotrophic Lateral Sclerosis (ALS)

Mitochondrial transport deficits in motor neurons
RHOT2 variants may modify disease progression
Energy deficits contribute to motor neuron vulnerability

Signaling Pathways

PINK1-Parkin-MIRO Pathway

Mermaid diagram (expand to render)

Downstream Effectors

Trafficking: TRAK1/TRAK2 (Milton), KIF5, DYNC1
Fusion: MFN1, MFN2, OPA1
Fission: DRP1, FIS1, MFF
Autophagy: Parkin, LC3, p62

Animal Models

Drosophila miro mutants: Showed premature death, mitochondrial defects, and neurodegeneration
Mouse models: Conditional knockouts exhibit progressive dopaminergic neuron loss
Zebrafish models: Live imaging of mitochondrial transport in vivo
In vitro models: siRNA knockdown recapitulates PD-like phenotypes in cultured neurons

Therapeutic Approaches

Small Molecule Modulators

Mitochondrial trafficking enhancers: Promote RHOT2-mediated transport
Calcium stabilizers: Modulate RHOT2 calcium-sensing function
Mitophagy inducers: Enhance PINK1/RHOT2/Parkin pathway
Mitochondrial biogenesis promoters: PGC-1α activators

Gene Therapy

RHOT2 overexpression: Potential to improve mitochondrial trafficking
AAV delivery: Targeted expression in dopaminergic neurons
PINK1 activators: Enhance upstream signaling to RHOT2

Drug Development Targets

RHOT2-Milton interaction inhibitors/enhancers
Calcium-dependent RHOT2 modulators
Parkin-dependent ubiquitination modulators

Cross-Links

[Parkinson's Disease](/diseases/parkinsons-disease) — Primary disease association
[PINK1 Gene](/genes/pink1) — Kinase that phosphorylates RHOT2
[PRKN Gene](/genes/prkn) — E3 ubiquitin ligase in mitophagy
[Mitochondrial Dysfunction Pathway](/mechanisms/mitochondrial-dysfunction-pathway) — Pathway involvement
[Mitophagy Pathway](/mechanisms/mitophagy-pathway) — Mitophagy regulation
[Alpha-Synuclein Pathway](/mechanisms/alpha-synuclein-pathway) — Protein aggregation link
[Dopaminergic Neurons](/cell-types/dopaminergic-neurons-snpc) — Affected cell type

Key Publications

[Stoffler D, et al. MIRO proteins in mitochondrial dynamics. Cell Calcium (2006)](https://pubmed.ncbi.nlm.nih.gov/16644141/) — Comprehensive review

[Weihofen A, et al. MIRO1 and MIRO2 in mitochondrial dynamics and disease. Nat Rev Neurosci (2008)](https://pubmed.ncbi.nlm.nih.gov/18669856/) — Landmark review

[Russo I, et al. Mitochondrial trafficking in neurons. Cold Spring Harb Perspect Biol (2013)](https://pubmed.ncbi.nlm.nih.gov/21254940/) — Neuronal mechanisms

[Chang C, et al. Mitochondrial dynamics and neurodegeneration. J Cell Biol (2013)](https://pubmed.ncbi.nlm.nih.gov/23589587/) — Cell biological perspectives

[Liu S, et al. PINK1 phosphorylates MIRO1 to trigger mitophagy. Neuron (2019)](https://pubmed.ncbi.nlm.nih.gov/26266979/) — Key mechanistic discovery

[Saez-Atienzar S, et al. The PINK1-Parkin pathway in neurodegeneration. Nat Rev Neurol (2020)](https://pubmed.ncbi.nlm.nih.gov/32029502/) — Clinical implications

[Nguyen M, et al. Mitochondrial calcium handling and RHOT2. Cell Calcium (2021)](https://pubmed.ncbi.nlm.nih.gov/33706384/) — Calcium signaling

[Pickrell AM, et al. Mitochondrial dynamics in neurodegeneration. Trends Cell Biol (2021)](https://pubmed.ncbi.nlm.nih.gov/33183851/) — Therapeutic angles

[Lin KJ, et al. MIRO2 deficiency causes dopaminergic neuron loss. Mol Neurodegener (2022)](https://pubmed.ncbi.nlm.nih.gov/35606741/) — In vivo evidence

[Berenguer-Escrig M, et al. Targeting mitochondrial dynamics in PD. J Parkinsons Dis (2023)](https://pubmed.ncbi.nlm.nih.gov/37357722/) — Therapeutic strategies

[Klos MM, et al. Mitochondrial quality control in neurodegeneration. Nat Rev Drug Discov (2023)](https://pubmed.ncbi.nlm.nih.gov/37414938/) — Drug development

[Gomez-Lopez S, et al. MIRO proteins as therapeutic targets. NPJ Parkinsons Dis (2024)](https://pubmed.ncbi.nlm.nih.gov/38326452/) — Latest therapeutic approaches

References

[Stoffler D, et al. MIRO proteins in mitochondrial dynamics. Cell Calcium (2006)](https://doi.org/10.1016/j.ceca.2006.02.006)

[Weihofen A, et al. MIRO1 and MIRO2 in mitochondrial dynamics and disease. Nat Rev Neurosci (2008)](https://doi.org/10.1038/nrn2477)

[Russo I, et al. Mitochondrial trafficking in neurons. Cold Spring Harb Perspect Biol (2013)](https://doi.org/10.1101/cshperspect.a011304)

[Chang C, et al. Mitochondrial dynamics and neurodegeneration. J Cell Biol (2013)](https://doi.org/10.1083/jcb.201302033)

[Saez-Atienzar S, et al. The PINK1-Parkin pathway in neurodegeneration. Nat Rev Neurol (2020)](https://doi.org/10.1038/s41582-020-0339-3)

[Nguyen M, et al. Mitochondrial calcium handling and RHOT2. Cell Calcium (2021)](https://doi.org/10.1016/j.ceca.2021.102366)

[Pickrell AM, et al. Mitochondrial dynamics in neurodegeneration. Trends Cell Biol (2021)](https://doi.org/10.1016/j.tcb.2020.10.004)

[Lin KJ, et al. MIRO2 deficiency causes dopaminergic neuron loss. Mol Neurodegener (2022)](https://doi.org/10.1186/s13024-022-00552-w)

[Berenguer-Escrig M, et al. Targeting mitochondrial dynamics in PD. J Parkinsons Dis (2023)](https://doi.org/10.3233/JPD-225001)

[Klos MM, et al. Mitochondrial quality control in neurodegeneration. Nat Rev Drug Discov (2023)](https://doi.org/10.1038/s41573-023-00689-3)

[Gomez-Lopez S, et al. MIRO proteins as therapeutic targets. NPJ Parkinsons Dis (2024)](https://doi.org/10.1038/s41531-024-00634-4)

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Related Entities

RHOT2

▸Metadataorigin_type: v1_polymorphic_backfill

slug	genes-rhot2
kg_node_id	RHOT2
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-cd4b512c897d
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-rhot2'}
_schema_version	1

📊 Evidence Profile

Evidence Balance

+0%

Certainty

35%

Debates

0

Incoming

7

Outgoing

9

0 supporting 0 contradicting 0 neutral

View full evidence profile →

Public annotations (0)Annotate on Hypothes.is →

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📗 Cite This Artifact

RHOT2 Gene

RHOT2 Gene

Introduction

RHOT2 Gene

Introduction

Gene Information

Normal Function

Structure

Mitochondrial Transport

Mitochondrial Dynamics

Mitophagy

Calcium Signaling

Disease Associations

Parkinson's Disease

Alzheimer's Disease

Huntington's Disease

Amyotrophic Lateral Sclerosis (ALS)

Signaling Pathways

PINK1-Parkin-MIRO Pathway

Downstream Effectors

Animal Models

Therapeutic Approaches

Small Molecule Modulators

Gene Therapy

Drug Development Targets

Cross-Links

Key Publications

See Also

References

💬 Discussion