<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">MIRO2 Gene</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>MIRO2</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>MIRO2</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Gene</td>
</tr>
<tr>
<td class="label">NCBI</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/?term=MIRO2" target="_blank">Search NCBI</a></td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/ms" style="color:#ef9a9a">Ms</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">11 edges</a></td>
</tr>
</table>
MIRO2 (also known as RHOT2) encodes mitochondrial Rho GTPase 2, an outer-mitochondrial-membrane trafficking regulator that integrates calcium sensing, motor-adaptor assembly, and organelle quality-control signaling.[@fransson2003][@saotome2008] In [neurons](/entities/neurons), this positioning function is not a housekeeping detail. It determines whether ATP-generating mitochondria reach synapses, whether damaged mitochondria are immobilized for quality control, and whether axons preserve energy homeostasis during stress.[@saotome2008][@oeding2023]
Although most mechanistic work has historically centered on [RHOT1](/genes/rhot1) (MIRO1), newer data indicate that RHOT2 contributes distinct control over mitochondrial motor-adaptor architecture and can modulate mitophagy readiness in stress states.[@oeding2023][@safiulina2019][@lopezdomenech2021] This is relevant to neurodegeneration, where mitochondrial trafficking failure, bioenergetic collapse, and defective organelle clearance converge across [Parkinson's disease](/diseases/parkinsons-disease), [Alzheimer's disease](/diseases/alzheimers-disease), and [Huntington's disease](/diseases/huntingtons).[@lopezdomenech2021][@lin2016][@madadi2020]
The gene is therefore best interpreted as a network coordinator rather than a single-pathway factor: MIRO2 influences transport velocity, stopping behavior near calcium microdomains, and transition from transport to degradation programs through the [PINK1-Parkin mitophagy pathway](/mechanisms/pink1-parkin-mitophagy-pathway).[@safiulina2019][@wang2011]
MIRO2 is located on chromosome 16 and encodes a tail-anchored outer-membrane GTPase.[@national2026] Its protein product, [MIRO2 Protein](/proteins/miro2-protein), shares core architecture with MIRO1:
Neurons depend on long-range trafficking to deliver mitochondria to presynaptic terminals, [dendritic spines](/mechanisms/dendritic-spines), and axon initial segments. MIRO proteins couple mitochondria to motor-adaptor complexes and thereby enable bidirectional trafficking along microtubules.[@saotome2008][@lopezdomenech2018] This function is tightly tied to synaptic performance because local ATP production and calcium buffering are location dependent.
When local calcium rises, MIRO-dependent transport is reprogrammed so mitochondria pause near active compartments. This stop-and-go behavior helps maintain calcium homeostasis and protects from local excitotoxic stress.[@saotome2008][@stephen2049] In disease-relevant settings, failure of this gating can produce either pathologic stalling (insufficient distribution) or pathologic persistence of movement (failure to stabilize near high-demand domains).
A key transition in mitochondrial biology is the shift from motility to quality control. MIRO proteins are central to this transition. Upon mitochondrial damage, PINK1/Parkin signaling marks MIRO for removal, arresting motility and allowing damaged organelles to enter [mitophagy](/mechanisms/mitophagy).[@wang2011][@cai2012] This step prevents continued trafficking of dysfunctional mitochondria into synaptic compartments.
Across major neurodegenerative disorders, transport defects often precede overt cell death. Disturbed MIRO-regulated transport can reduce mitochondrial density at synapses, worsen ATP shortfall, and amplify calcium dysregulation.[@lopezdomenech2021][@lin2016] In cortical and striatal systems, this creates vulnerability in neurons with long projections and high firing burden.
If MIRO-dependent motility arrest does not occur efficiently during mitochondrial injury, damaged organelles can evade quality-control checkpoints. Experimental systems show that Miro proteins prime mitochondria for Parkin translocation and influence mitophagic competence.[@safiulina2019] This has direct relevance to PD-linked pathways where mitochondrial turnover is already strained.[@wang2011]
Loss-of-function and dysregulation studies in the Miro axis have also been linked to maladaptive stress signaling and neuronal dysfunction, including integrated-stress-response amplification in some contexts.[@lopezdomenech2021] This supports a model in which MIRO2 perturbation is not purely structural; it can alter downstream proteostasis and translational control modules.
The strongest mechanistic bridge is in PD-related mitochondrial quality control. PINK1/Parkin signaling targets Miro-family proteins to halt damaged mitochondrial transport, a prerequisite for effective mitophagy.[@wang2011][@cai2012] If this checkpoint is inefficient, dopaminergic neurons in metabolically demanding circuits may accumulate dysfunctional mitochondria, increasing oxidative and bioenergetic stress.[@lopezdomenech2021][@lin2016]
MIRO2 should therefore be viewed as a modifier of mitophagy efficiency rather than a classic monogenic PD driver. Even without frequent high-penetrance variants, pathway-level dysregulation may influence disease tempo or therapeutic response.
AD models consistently show impaired mitochondrial trafficking, synaptic energy failure, and calcium imbalance. MIRO-dependent transport logic intersects with each of these abnormalities.[@lin2016][@stephen2049] Emerging systems work suggests that mitochondrial motility regulators can shape dendritic maintenance and white-matter resilience after injury, supporting translational relevance beyond one diagnosis.[@galloway2020][@qin2019]
HD features early corticostriatal energy stress and transport disruption. The Miro axis provides a mechanistic link between cytoskeletal transport and mitochondrial competency in these vulnerable neurons.[@lin2016][@burel2016] In this framing, MIRO2 is part of the broader vulnerability architecture that determines whether high-demand projection neurons compensate or decompensate under proteotoxic and metabolic burden.
MIRO2 sits at a measurable interface: transport phenotypes, mitophagy state transitions, and stress-response outputs can be quantified in iPSC-derived neurons and high-content imaging pipelines.[@oeding2023][@lopezdomenech2021] This makes MIRO2 a useful experimental readout for candidate interventions targeting mitochondrial resilience.
Current evidence supports testing MIRO2-centered hypotheses indirectly through pathway-directed strategies: