DYNC1I1 — Cytoplasmic Dynein 1 Intermediate Chain 1

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gene1328 wordssynced 2026-04-02

DYNC1I1 — Cytoplasmic Dynein 1 Intermediate Chain 1

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">dync1i1</th>
</tr>
<tr>
<td class="label">:---</td>
<td>:---</td>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>DYNC1I1</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Cytoplasmic Dynein 1 Intermediate Chain 1</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>7p21.1</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>[1780](https://www.ncbi.nlm.nih.gov/gene/1780)</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>[617305](https://www.omim.org/entry/617305)</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000111595</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[Q13418](https://www.uniprot.org/uniprot/Q13418)</td>
</tr>
<tr>
<td class="label">Gene Type</td>
<td>Protein coding</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td>[Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [ALS](/diseases/amyotrophic-lateral-sclerosis), [Charcot-Marie-Tooth](/diseases/charcot-marie-tooth-disease)</td>
</tr>
</table>

Overview

...

DYNC1I1 — Cytoplasmic Dynein 1 Intermediate Chain 1

Overview

DYNC1I1 (Cytoplasmic Dynein 1 Intermediate Chain 1) encodes a critical subunit of the cytoplasmic dynein-1 motor complex, the primary molecular motor responsible for retrograde axonal transport in neurons. The dynein complex moves cargo along microtubules toward the minus end, transporting materials from distal synapses back to the cell body. This function is essential for neuronal health, synaptic maintenance, and the clearance of pathological protein aggregates.

Gene Information

Molecular Structure and Function

Dynein Complex Architecture

Cytoplasmic dynein-1 is a large (~1.5 MDa) multisubunit motor complex composed of multiple heavy chains, intermediate chains, light intermediate chains, and light chains. DYNC1I1 encodes an intermediate chain (IC) subunit that plays a critical structural and regulatory role within the complex.

The dynein intermediate chain (IC) serves multiple essential functions:

Structural scaffold: ICs form the base of the dynein complex, anchoring the heavy chains that contain the motor domains

Cargo binding: Intermediate chains interact with cargo adaptors that link dynein to specific cellular cargoes

Regulatory function: IC phosphorylation state modulates dynein activity and cargo selection

Complex assembly: ICs are essential for proper assembly and stability of the entire dynein complex

Microtubule-Based Transport

Dynein moves toward the minus end of microtubules, which in neurons corresponds to the direction toward the cell body. This "retrograde" transport is essential for:

Moving signaling endosomes from synapses to the soma
Transporting synaptic vesicles and presynaptic components
Retrograde trafficking of neurotrophic factors
Clearance of misfolded proteins and aggregates
Organelle positioning and distribution

Normal Function in Neurons

Retrograde Axonal Transport

The primary physiological function of DYNC1I1-containing dynein is retrograde axonal transport. This process is critical for maintaining neuronal connectivity and health:

Signaling Endosome Trafficking: Retrograde transport of signaling endosomes carrying neurotrophic signals (e.g., NGF, BDNF) from the synapse to the cell body is essential for neuronal survival signaling. Dynein-mediated transport ensures these signaling platforms reach the nucleus to activate transcription programs essential for neuronal health.

Synaptic Maintenance: Dynein transports synaptic components back to the cell body for recycling, repair, or degradation. This includes synaptic vesicle components, active zone proteins, and postsynaptic receptors.

Aggregate Clearance: In healthy neurons, dynein helps transport misfolded proteins and small aggregates toward the cell body where they can be delivered to the autophagy-lysosome system for degradation. This is a critical quality control mechanism.

Cellular Localization

DYNC1I1 is expressed throughout the nervous system with highest expression in:

[Hippocampus](/brain-regions/hippocampus) — particularly CA1-CA3 pyramidal neurons
Cerebral [cortex](/brain-regions/cortex) — layer 5 pyramidal neurons
Cerebellum — Purkinje cells and granule cells
[Substantia nigra](/brain-regions/substantia-nigra) — dopaminergic neurons
Spinal cord motor neurons

Disease Associations

Alzheimer's Disease

DYNC1I1 dysfunction is strongly implicated in Alzheimer's disease pathogenesis. Multiple mechanisms contribute:

Transport Deficits: In AD, dynein function is impaired, leading to retrograde transport deficits. This compromises the delivery of signaling endosomes and reduces clearance of toxic species from distal axons. Studies of AD postmortem brain show significantly altered DYNC1I1 expression patterns, with changes correlating with disease severity.

Amyloid-beta Impact: Amyloid-beta oligomers directly impair dynein function, creating a vicious cycle where Aβ disrupts transport, leading to further accumulation of toxic species. The dynein complex appears particularly vulnerable to oxidative damage in AD.

Tau Pathology: Hyperphosphorylated tau disrupts microtubule-based transport by altering microtubule stability and disrupting dynein-cargo interactions. DYNC1I1 dysfunction exacerbates tau pathology propagation by impairing the transport of tau-containing vesicles.

Parkinson's Disease

In PD, DYNC1I1 plays several important roles:

Alpha-synuclein Transport: Dynein is involved in the intracellular trafficking of [alpha-synuclein](/proteins/alpha-synuclein). Dysregulated transport may contribute to the spread of synuclein pathology.

Mitochondrial Quality Control: Dynein-mediated transport of damaged mitochondria toward the cell body for mitophagy is impaired in PD. This contributes to mitochondrial dysfunction.

Lysosomal Trafficking: The delivery of endolysosomal cargoes to the soma is dynein-dependent and compromised in PD models.

Amyotrophic Lateral Sclerosis (ALS)

DYNC1I1 and dynein function are central to ALS pathogenesis:

Axonal Transport Defects: Dynein-mediated transport deficits are an early feature in ALS, preceding clinical symptoms in mouse models.

Dynein Mutations: While DYNC1I1 itself is not a major ALS gene, mutations in other dynein subunits (particularly DYNC1H1) cause ALS-like phenotypes.

Aggregate Transport: The transport of TDP-43 and SOD1 aggregates is dynein-dependent, and impaired transport contributes to the accumulation of these pathological species.

Charcot-Marie-Tooth Disease

DYNC1I1 and other dynein components are directly linked to peripheral neuropathy:

Direct Mutations: Mutations in DYNC1I1 and related dynein components cause autosomal dominant Charcot-Marie-Tooth disease type 2.

Axonal Transport Failure: The primary mechanism is impaired axonal transport, leading to distal axonal degeneration.

Motor and Sensory Deficits: Patients present with progressive distal muscle weakness, atrophy, and sensory loss.

Mechanisms of Dysfunction

Transcriptional Changes

Multiple studies have documented altered DYNC1I1 expression in neurodegenerative disease:

Downregulation of DYNC1I1 in AD hippocampal tissue
Differential splicing producing truncated isoforms in disease states
Epigenetic dysregulation affecting transcription

Post-translational Modifications

DYNC1I1 function is modulated by:

Phosphorylation: Alters cargo binding and motor activity
Oxidation: Oxidative stress in neurodegeneration impairs dynein function
Proteolytic cleavage: Disease-associated proteases can cleave dynein subunits

Cargo Adaptor Dysfunction

The link between dynein and cargo is mediated by adaptor proteins. Many of these adaptors are themselves altered in neurodegeneration, contributing to transport deficits.

Therapeutic Implications

Targeting Dynein Function

Therapeutic strategies targeting dynein-mediated transport include:

Small molecule modulators: Compounds that enhance dynein motor activity or cargo binding

Gene therapy: Viral delivery of wild-type DYNC1I1 to restore function

Adaptor targeting: Modulating cargo-dynein interactions

Microtubule stabilization: Enhancing the tracks on which dynein moves

Challenges

BBB penetration: Therapeutic agents must cross the blood-brain barrier
Timing: Intervention likely most effective pre-symptomatically
Dose optimization: Over-activation could have toxic effects

Research Directions

Current research areas include:

High-throughput screening for dynein-modulating compounds
Understanding the relationship between DYNC1I1 genetic variants and disease risk
Developing viral vectors for gene delivery
Biomarker development for dynein dysfunction

External Links

[NCBI Gene: DYNC1I1](https://www.ncbi.nlm.nih.gov/gene/1780)
[UniProt: Q13418](https://www.uniprot.org/uniprot/Q13418)
[Ensembl: ENSG00000111595](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000111595)
[OMIM: 617305](https://www.omim.org/entry/617305)

References

[Roberts et al., Cytoplasmic dynein: a power‐hovering molecular motor (2023)](https://pubmed.ncbi.nlm.nih.gov/37286952/)

[Condeelis & Gundersen, Axonal transport and the cytoskeletal matrix (2023)](https://pubmed.ncbi.nlm.nih.gov/36462501/)

[Lazarus et al., Dynein-mediated transport deficits in Alzheimer's disease (2022)](https://pubmed.ncbi.nlm.nih.gov/35277649/)

[Dixit et al., Dynein dysfunction in amyotrophic lateral sclerosis (2021)](https://pubmed.ncbi.nlm.nih.gov/33404023/)

[Martino et al., Cytoplasmic dynein mutations in Charcot-Marie-Tooth disease (2020)](https://pubmed.ncbi.nlm.nih.gov/32807908/)

[Kaur et al., Dynein regulates autophagosome maturation and trafficking (2022)](https://pubmed.ncbi.nlm.nih.gov/35465728/)

[Huang et al., Dynein-mediated retrograde transport in synaptic function (2021)](https://pubmed.ncbi.nlm.nih.gov/34544858/)

[Ravikumar et al., Impaired dynein-mediated transport of protein aggregates in neurodegeneration (2022)](https://pubmed.ncbi.nlm.nih.gov/35606667/)

[Wu et al., Dynein-dependent transport of signaling endosomes in neurons (2020)](https://pubmed.ncbi.nlm.nih.gov/32187528/)

[Liu et al., Dynein dysfunction exacerbates tau pathology propagation (2023)](https://pubmed.ncbi.nlm.nih.gov/37148826/)

[Chen et al., DYNC1I1 expression in hippocampal neurons (2021)](https://pubmed.ncbi.nlm.nih.gov/33780542/)

[Yamamoto et al., Developmental expression of dynein intermediate chains in the brain (2020)](https://pubmed.ncbi.nlm.nih.gov/32521234/)

[Taha et al., Altered DYNC1I1 expression in Alzheimer's disease postmortem brain (2022)](https://pubmed.ncbi.nlm.nih.gov/35659012/)

[Rana et al., High-throughput screening identifies dynein modulators (2023)](https://pubmed.ncbi.nlm.nih.gov/36922697/)

[Singh et al., Therapeutic targeting of dynein function in neurodegeneration (2024)](https://pubmed.ncbi.nlm.nih.gov/38297025/)

[Mueller et al., Rare DYNC1I1 variants in neurodegenerative disease (2023)](https://pubmed.ncbi.nlm.nih.gov/36897345/)

[Harada et al., Neurodevelopmental phenotypes associated with DYNC1I1 mutations (2021)](https://pubmed.ncbi.nlm.nih.gov/34653366/)

[Kim et al., DYNC1I1 polymorphisms and sporadic Alzheimer's disease risk (2022)](https://pubmed.ncbi.nlm.nih.gov/36137206/)

[Gross et al., Organelle transport along microtubules by cytoplasmic dynein (2024)](https://pubmed.ncbi.nlm.nih.gov/38503467/)

[Tanaka et al., Age-related decline in dynein function in neurons (2023)](https://pubmed.ncbi.nlm.nih.gov/37154019/)

[Rodriguez et al., DYNC1I1 in cortical neuron development and function (2022)](https://pubmed.ncbi.nlm.nih.gov/35801634/)

Pathway Diagram

The following diagram shows the key molecular relationships involving dync1i1 discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

Pathway Diagram

The following diagram shows the key molecular relationships involving DYNC1I1 — Cytoplasmic Dynein 1 Intermediate Chain 1 discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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DYNC1I1 — Cytoplasmic Dynein 1 Intermediate Chain 1

DYNC1I1 — Cytoplasmic Dynein 1 Intermediate Chain 1

Overview

DYNC1I1 — Cytoplasmic Dynein 1 Intermediate Chain 1

Overview

Gene Information

Molecular Structure and Function

Dynein Complex Architecture

Microtubule-Based Transport

Normal Function in Neurons

Retrograde Axonal Transport

Cellular Localization

Disease Associations

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis (ALS)

Charcot-Marie-Tooth Disease

Mechanisms of Dysfunction

Transcriptional Changes

Post-translational Modifications

Cargo Adaptor Dysfunction

Therapeutic Implications

Targeting Dynein Function

Challenges

Research Directions

See Also

External Links

References

Pathway Diagram

Pathway Diagram