<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="text-align:center;">TIC1 Protein</th></tr>
<tr><td><strong>Current Wiki Label</strong></td><td>TIC1 (provisional mitochondrial iron-import context page)</td></tr>
<tr><td><strong>Closest Human Axis</strong></td><td>Mitoferrin pathway (SLC25A37 / SLC25A28)</td></tr>
<tr><td><strong>Core Biology</strong></td><td>Mitochondrial iron uptake, heme and Fe-S cluster biogenesis</td></tr>
<tr><td><strong>Primary Relevance</strong></td><td>Oxidative stress, ferroptosis pressure, mitochondrial vulnerability</td></tr>
<tr><td><strong>Related Mechanisms</strong></td><td>[Iron metabolism](/mechanisms/iron-metabolism), [mitochondrial dysfunction](/mechanisms/mitochondrial-dysfunction)</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>
<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="text-align:center;">TIC1 Protein</th></tr>
<tr><td><strong>Current Wiki Label</strong></td><td>TIC1 (provisional mitochondrial iron-import context page)</td></tr>
<tr><td><strong>Closest Human Axis</strong></td><td>Mitoferrin pathway (SLC25A37 / SLC25A28)</td></tr>
<tr><td><strong>Core Biology</strong></td><td>Mitochondrial iron uptake, heme and Fe-S cluster biogenesis</td></tr>
<tr><td><strong>Primary Relevance</strong></td><td>Oxidative stress, ferroptosis pressure, mitochondrial vulnerability</td></tr>
<tr><td><strong>Related Mechanisms</strong></td><td>[Iron metabolism](/mechanisms/iron-metabolism), [mitochondrial dysfunction](/mechanisms/mitochondrial-dysfunction)</td></tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
</div>
This page tracks the mitochondrial iron-import mechanism under the current `TIC1` label used in parts of NeuroWiki. In mammals, the best-established mitochondrial iron importers are mitoferrin proteins (SLC25A37 and SLC25A28), while yeast ortholog systems include Mrs3/Mrs4.[@mhlenhoff2003][@shaw2006][@paradkar2009] The mechanistic importance for neurodegeneration is high: mitochondrial iron excess or miscompartmentalization can drive [reactive oxygen species](/entities/reactive-oxygen-species) generation, respiratory-chain impairment, and [ferroptosis](/entities/ferroptosis)-prone states.[@stockwell2017][@belaidi2016]
Because "TIC1" nomenclature can be ambiguous across databases/species, claims on this page are intentionally anchored to well-supported mitochondrial iron import biology rather than to a single unresolved symbol mapping. The disease-relevant mechanism is still actionable and should be cross-linked to [iron metabolism](/mechanisms/iron-metabolism), [ferroptosis](/mechanisms/ferroptosis-neurodegeneration), and [mitochondrial dysfunction](/mechanisms/mitochondrial-dysfunction).
Mitochondria require iron for two central outputs:
Evidence from yeast and mammalian systems supports a conserved concept: dedicated inner-membrane carriers move iron into the mitochondrial matrix where scaffold proteins and assembly systems partition iron into heme and Fe-S pathways.[@mhlenhoff2003][@shaw2006][@rouault2016]
Insufficient import impairs energy metabolism and Fe-S biology, while excess import promotes redox-active iron accumulation and oxidative injury. Neurodegenerative risk often emerges from this imbalance, not simply from "high" or "low" iron alone.[@stockwell2017][@belaidi2016]
Substantia nigra pars compacta shows reproducible iron dyshomeostasis in Parkinson disease, and mitochondrial vulnerability in dopaminergic [neurons](/entities/neurons) amplifies injury from redox-active iron pools.[@dexter1989][@ward2014] Iron-dependent oxidative stress can reinforce [alpha-synuclein](/proteins/alpha-synuclein) misfolding and mitochondrial failure loops.
Alzheimer brains show region-specific iron accumulation and disturbed iron-handling signatures. Mitochondrial iron stress can exacerbate lipid peroxidation, proteostasis burden, and synaptic failure.[@belaidi2016][@raven2013]
Friedreich ataxia provides a high-confidence disease model linking defective mitochondrial iron handling to Fe-S biogenesis failure, respiratory dysfunction, and selective neuronal/cardiac vulnerability.[@pandolfo2013]
Ferroptosis is a regulated cell-death state driven by iron-dependent lipid peroxidation. Mitochondrial iron flux and buffering status can modify ferroptotic sensitivity in stressed neural systems.[@stockwell2017][@do2016]
Brain-penetrant iron modulators (for example deferiprone) have been tested in neurodegeneration to lower pathological redox-active pools, though efficacy and safety depend strongly on disease stage and target tissue.[@devos2014]
Future strategy classes include:
Overcorrection can worsen Fe-S and heme insufficiency. Therapeutic design must preserve essential mitochondrial iron use while reducing toxic iron chemistry.
When this page is cited elsewhere, use wording such as: