<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">DCTN4 Protein</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>DCTN4</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>DCTN4</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Protein</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=DCTN4" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
[DCTN4](/proteins/dctn4-protein) (dynactin subunit 4, historically p62) is a structural component of the [dynactin complex](/proteins/dynactin-protein), the obligate cofactor that enables long-range cytoplasmic dynein transport on microtubules.[@hammesfahr2012][@urnavicius2015] In [neurons](/entities/neurons), dynein-dynactin transport supports retrograde return of signaling endosomes, autophagosomes, and damaged organelles from distal axons to the soma, where stress-response transcription and degradative pathways are coordinated.[@moughamian2012][@millecamps2013][@de2008]
<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">DCTN4 Protein</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>DCTN4</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>DCTN4</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Protein</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=DCTN4" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>
[DCTN4](/proteins/dctn4-protein) (dynactin subunit 4, historically p62) is a structural component of the [dynactin complex](/proteins/dynactin-protein), the obligate cofactor that enables long-range cytoplasmic dynein transport on microtubules.[@hammesfahr2012][@urnavicius2015] In [neurons](/entities/neurons), dynein-dynactin transport supports retrograde return of signaling endosomes, autophagosomes, and damaged organelles from distal axons to the soma, where stress-response transcription and degradative pathways are coordinated.[@moughamian2012][@millecamps2013][@de2008]
For disease interpretation, DCTN4 is best viewed as a transport-resilience node inside a multi-subunit machine. Evidence is strongest at the complex/pathway level; DCTN4-specific human causality remains less mature than for some other dynactin subunits, but biologic plausibility is high because complex integrity is dosage- and context-sensitive.[@urnavicius2015][@yeh2014][@millecamps2013]
Dynactin contains an Arp1 filament backbone, sidearm components, and accessory subunits that collectively organize dynein activation and cargo engagement.[@hammesfahr2012][@urnavicius2015][@yeh2014] DCTN4 contributes to this architecture by supporting stable subunit packing and complex-level function. In practical terms, DCTN4 does not act as an isolated signaling enzyme; its effect is emergent through the state of the assembled transport complex.[@urnavicius2015][@yeh2014]
Mechanistically, three linked dependencies matter:
In long-projecting neurons, retrograde transport is not a single continuous event but a cycle of initiation, pause regulation, cargo handoff, and re-engagement. Dynactin is required across these transitions, and DCTN4 contributes to the reliability margin of this process.[@moughamian2012][@nirschl2016]
Likely DCTN4-sensitive outputs include:
Axonal transport disruption is repeatedly implicated across [Amyotrophic Lateral Sclerosis (ALS)](/diseases/amyotrophic-lateral-sclerosis)))))))))))), [Parkinson's Disease](/diseases/parkinsons-disease), and other neurodegenerative settings, with convergent support from model systems and human tissue analyses.[@yu2018][@kumakozakiewicz2013][@millecamps2013][@de2008]
Because DCTN4 is embedded in the same required complex, altered DCTN4 expression or assembly compatibility is expected to reduce transport robustness and increase stress susceptibility, especially in long-axon systems.[@hammesfahr2012][@urnavicius2015][@yeh2014][@millecamps2013]
Compared with heavily studied transport genes, DCTN4-specific genotype-phenotype datasets in major neurodegenerative cohorts remain sparse. This represents an evidence gap, not evidence of irrelevance.[@yu2018][@millecamps2013]
[Corticobasal Syndrome (CBS)](/diseases/corticobasal-syndrome) and [Progressive Supranuclear Palsy (PSP)](/diseases/progressive-supranuclear-palsy) are 4R-tauopathy syndromes with pronounced network-level failure in long-range projection systems. DCTN4 is relevant in this context through pathway coupling rather than syndrome-specific mutation burden: impaired dynein-dynactin function can amplify distal cargo stalling, autophagic backlog, and trophic signal failure in already stressed [tau](/proteins/tau)-vulnerable circuits.[@millecamps2013][@de2008]
From a translational perspective, DCTN4 should be monitored as part of broader transport-state panels for CBS/PSP mechanistic stratification rather than as a standalone diagnostic marker.
High-value study designs include: