DYNC1I2 Protein

Migration, Crosslink

📖

DYNC1I2 Protein

active

wiki page Created: 2026-04-02T07:19:07 By: crosslink-migration Quality: 50% ✓ SciDEX ID: wiki-proteins-dync1i2-protein

📖 Wiki Page

protein1552 wordssynced 2026-04-02

DYNC1I2 Protein

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">DYNC1I2 Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Cytoplasmic Dynein 1 Intermediate Chain 2 (DIC2)</td>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>DYNC1I2</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[Q86X29](https://www.uniprot.org/uniprot/Q86X29)</td>
</tr>
<tr>
<td class="label">Alternative Names</td>
<td>Dynein intermediate chain 2, DIC2, IC2</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~71 kDa</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>~650 amino acids</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>2q21.3</td>
</tr>
<tr>
<td class="label">Subcellular Location</td>
<td>Cytoplasm, microtubules, axon (retrograde transport)</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>Dynein intermediate chain family</td>
</tr>
<tr>
<td class="label">Strategy</td>
<td>Approach</td>
</tr>
<tr>
<td class="label">Microtubule stabilization</td>
<td>Epothilone D, BMS-984702</td>
</tr>
<tr>
<td class="label">Dynein activation</td>
<td>Small molecule activators</td>
</tr>
<tr>
<td class="label">Dynactin enhancement</td>
<td>Protein-based therapeutics</td>
</tr>
<tr>
<td class="label">Reduce tau pathology</td>
<td>Anti-tau antibodies, kinase inhibitors</td>
</tr>
<tr>
<td class="label">**Gene t

...

DYNC1I2 Protein

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">DYNC1I2 Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Cytoplasmic Dynein 1 Intermediate Chain 2 (DIC2)</td>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>DYNC1I2</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[Q86X29](https://www.uniprot.org/uniprot/Q86X29)</td>
</tr>
<tr>
<td class="label">Alternative Names</td>
<td>Dynein intermediate chain 2, DIC2, IC2</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~71 kDa</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>~650 amino acids</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>2q21.3</td>
</tr>
<tr>
<td class="label">Subcellular Location</td>
<td>Cytoplasm, microtubules, axon (retrograde transport)</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>Dynein intermediate chain family</td>
</tr>
<tr>
<td class="label">Strategy</td>
<td>Approach</td>
</tr>
<tr>
<td class="label">Microtubule stabilization</td>
<td>Epothilone D, BMS-984702</td>
</tr>
<tr>
<td class="label">Dynein activation</td>
<td>Small molecule activators</td>
</tr>
<tr>
<td class="label">Dynactin enhancement</td>
<td>Protein-based therapeutics</td>
</tr>
<tr>
<td class="label">Reduce tau pathology</td>
<td>Anti-tau antibodies, kinase inhibitors</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>AAV-mediated expression of transport proteins</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

DYNC1I2 (Dynein Cytoplasmic 1 Intermediate Chain 2) encodes the intermediate chain 2 (IC2) subunit of the cytoplasmic dynein 1 complex, the primary minus-end-directed microtubule motor in all eukaryotes[@vallee2001]. Cytoplasmic dynein drives retrograde axonal transport — the movement of organelles, vesicles, proteins, and signaling complexes from the distal axon back toward the cell body. In neurons, this process is essential for synaptic function, organelle homeostasis, protein turnover, and survival signaling. DYNC1I2 is particularly important in the nervous system, and mutations in this gene cause cortical malformations and axonal transport disorders including hereditary spastic paraplegia[@schiavi2022].

The dynein complex is a massive (~1.5 MDa) ring-shaped AAA+ ATPase machine. The intermediate chains form part of the base of the complex, anchoring the complex to cargo via interactions with adaptor proteins and directly binding microtubules. DYNC1I2 is one of two highly similar intermediate chain genes (DYNC1I1 and DYNC1I2) in vertebrates.

Protein Information

Structure

Domain Architecture

The DYNC1I2 protein contains multiple functional domains[@kardon2009]:

N-terminal Cargo-Binding Domain (~350 residues):

Contains multiple protein-protein interaction motifs
Binds directly to dynactin complex via the DCTN1 (p150-glued) subunit
Interacts with cargo adaptor proteins (bicyclopen, RhoBTB3, Hook proteins)
Homodimerization interface (DYNC1I2 forms homodimers within the dynein complex)

Microtubule-Binding Domain (~200 residues, middle region):

Binds to the microtubule plus-end track
Multiple microtubule interaction surfaces
Couples ATP-driven conformational changes to stepping motion

AAA+ Domains (C-terminal region):

Six AAA+ modules (AAA1-AAA6) drive the mechanical cycle
AAA1 is the primary ATPase site; AAA2-AAA4 contribute to mechanochemistry
AAA5 and AAA6 have regulatory roles
The ring structure undergoes coordinated ATP hydrolysis cycles to generate force

Complex Architecture

DYNC1I2 is one of two intermediate chain paralogs that form part of the dynein holoenzyme:

Dynein homodimer: Two heavy chains (DYNC1H1), each with associated intermediate chains, light intermediate chains, and light chains
4 intermediate chains per dynein: Typically DYNC1I2 homodimers, sometimes mixed with DYNC1I1
Dynactin complex: A separate ~1 MDa complex that activates dynein and increases processivity; DYNC1I2 directly interacts with the dynactin subunit DCTN1 (p150-glued)
Cargo adaptors: Numerous adaptors (biccnl,-hook1-3, rab11-FIP3, etc.) connect specific cargo to the dynein-dynactin complex

Normal Function

Retrograde Axonal Transport

Cytoplasmic dynein powered by DYNC1I2 is the engine of retrograde axonal transport[@hirokawa2009]:

What gets transported:

Vesicular cargo: Endosomes, signaling endosomes, autophagosomes
Organelles: Mitochondria (in part), lysosomes, Golgi-derived vesicles
Protein complexes: Neurotrophin signaling endosomes (NGF, BDNF), transcription factor complexes
Pathogens: Herpesvirus, adenovirus for intracellular transport
RNA granules: Some neuronal RNA transport

Key transport features:

Velocity: ~0.5-2 μm/s (slower than kinesin anterograde transport at ~1-3 μm/s)
Processivity: ~1-2 μm per run; dynactin greatly increases run length to ~5-10 μm
Direction: Always minus-end (toward cell body) — microtubules are oriented minus-end toward cell body in axons
Regulation: Multiple mechanisms including phosphorylation, cargo adapters, and regulatory proteins

Mechanism of Force Generation

The dynein motor uses a unique "walking" mechanism distinct from kinesins[@reck2018]:

Dynein binds microtubule: Microtubule-binding domain interacts with tubulin

ATP binding to AAA1: Drives a conformational change in the linker domain

Release from microtubule: The mechanical element detaches

Power stroke: The linker bends, pulling the stalk toward the ring

Microtubule rebinding: At a new position ~8 nm toward the minus end

Hydrolysis and recovery: ATP hydrolysis resets the cycle

This produces ~8 nm steps — the tubulin dimer repeat — with variable stepping behavior.

Cellular Functions

Retrograde neurotrophin signaling:

NGF and other neurotrophins are internalized at nerve terminals and transported as signaling endosomes toward the cell body
DYNC1I2/dynein powers this transport, allowing distal signals to activate nuclear transcription programs
Critical for neuronal survival and plasticity

Organelle and endosome trafficking:

Retrograde movement of early and late endosomes
Sorting of endocytic cargo
Delivery to the soma for degradation or recycling

Mitophagy in neurons:

Damaged mitochondria in distal axons are engulfed by autophagosomes
Autophagosomes are transported retrogradely by dynein for lysosomal fusion in the soma

Cell division:

Dynein positions the nucleus and centrosome during interphase
Essential for chromosome alignment and spindle organization during mitosis

Role in Neurodegeneration

Axonal Transport Deficits

Impaired axonal transport is a unifying feature of many neurodegenerative diseases[@stam2018]:

Hallmarks of transport dysfunction:

Organelle accumulation at synapses and distal axons
Swollen, dystrophic axons
Protein aggregation (often from impaired turnover)
Neuroinflammation (from impaired immune signaling)
Distal axon degeneration ("dying-back" pattern)

Hereditary Spastic Paraplegia (HSP)

DYNC1I2 mutations cause autosomal dominant HSP:

SPG11: Caused by loss-of-function mutations; characterized by spasticity and thin corpus callosum
SPG15 (ZFYVE26/SPG15): Affects dynein-dynactin interaction
DYNC1I2 variants disrupt the dynein-dynactin interaction, impairing cargo attachment and processivity[@schiavi2022]

Malformations of Cortical Development

Missense mutations in DYNC1I2 cause cortical malformations[@schiavi2022]:

Periventricular heterotopia: Neuronal migration arrest
Polymicrogyria: Abnormal cortical folding
Microcephaly: Reduced brain size
Mechanism: Impaired dynein function disrupts neuronal migration during cortical development

Alzheimer's Disease

Tau-mediated transport impairment:

Hyperphosphorylated tau accumulates along microtubules, physically obstructing dynein-mediated transport
Tau also destabilizes microtubules, reducing the track for transport
Impaired retrograde transport contributes to synaptic dysfunction and neuronal death[@wang2021]

APP and Aβ transport:

APP is processed in the soma and transported to nerve terminals; dynein may contribute to APP trafficking
Impaired transport disrupts APP processing compartments, potentially increasing Aβ production

Parkinson's Disease

Alpha-synuclein aggregates can impair axonal transport machinery
Impaired retrograde transport of signaling endosomes reduces survival signals in dopaminergic neurons
Mitochondrial quality control (mitophagy) in distal axons requires dynein function
LRRK2 mutations affect microtubule-based transport; interplay with dynein is under investigation

Amyotrophic Lateral Sclerosis (ALS)

Motor neurons have extremely long axons — they are particularly vulnerable to transport defects
Mutations in DCTN1 (dynactin p150-glued) cause ALS-like phenotypes
TDP-43 aggregation may impair axonal transport
SMN deficiency in spinal muscular atrophy directly impacts axonal transport

Mechanism of Action

Mermaid diagram (expand to render)

Therapeutic Approaches

Targeting Axonal Transport

Therapeutic strategies are limited but actively researched[@wang2021]:

Challenges

Neuronal polarity: Long axons make systemic delivery of therapeutics to neurons extremely difficult

BBB: Most large molecules do not cross the blood-brain barrier

Specificity: Enhancing dynein globally may have off-target effects on cell division

Dosage: Transport needs vary by cargo and cell type — global enhancement may be problematic

Cross-Linking Relationships

[Dynein Heavy Chain (DYNC1H1)](/proteins/dync1h1-protein) — Catalytic subunit, AAA+ motor
[Dynactin (DCTN1/p150-glued)](/proteins/dctn1-protein) — Key regulatory complex, directly interacts with DYNC1I2
[Hook proteins (HOOK1, HOOK2, HOOK3)](/proteins/hook-proteins) — Cargo adaptors
[Bicc1 (Biccnl)](/proteins/bicc1-protein) — Cargo adaptor for specific vesicles
[Kinesin-1 (KIF5A/B/C)](/proteins/kinesin-1-protein) — Complementary anterograde transport motor

[Axonal Transport](/mechanisms/axonal-transport) — Core function
[Retrograde Signaling](/mechanisms/retrograde-signaling-endosomes) — Neurotrophin signaling
[Endosomal Trafficking](/mechanisms/endosomal-trafficking) — Endosome dynamics
[Mitophagy](/mechanisms/mitophagy) — Mitochondrial quality control
[Neuronal Cytoskeleton](/mechanisms/neuronal-cytoskeleton) — Microtubule-based motility

Disease Associations

[Hereditary Spastic Paraplegia](/diseases/hereditary-spastic-paraplegia) — Direct genetic cause
[Alzheimer's Disease](/diseases/alzheimers-disease) — Transport impairment by tau
[Parkinson's Disease](/diseases/parkinsons-disease) — Transport dysfunction
[ALS](/diseases/amyotrophic-lateral-sclerosis) — Transport defects in motor neurons
[Periventricular Heterotopia](/diseases/periventricular-heterotopia) — DYNC1I2 mutations

External Links

[UniProt: Q86X29](https://www.uniprot.org/uniprot/Q86X29)
[NCBI Gene: DYNC1I2](https://www.ncbi.nlm.nih.gov/gene/17830)
[GeneCards: DYNC1I2](https://www.genecards.org/cgi-bin/carddisp.pl?gene=DYNC1I2)
[Human Protein Atlas: DYNC1I2](https://www.proteinatlas.org/ENSG00000105875-DYNC1I2)
[DyneinDB: Human DYNC1I2](http://www.dyneindb.com/)

References

[Vallee RB, et al, Cytoplasmic dynein: a power for neuronal transport (2001)](https://pubmed.ncbi.nlm.nih.gov/11747810/)

[Stam S, et al, The role of axonal transport in neurodegenerative diseases (2018)](https://pubmed.ncbi.nlm.nih.gov/29368183/)

[Maday S, et al, Axonal transport: cargo-specific mechanisms of motility and regulation (2014)](https://pubmed.ncbi.nlm.nih.gov/25374355/)

[Ebbing B, et al, Dysfunction of axonal transport in hereditary spastic paraplegia (2008)](https://pubmed.ncbi.nlm.nih.gov/18250098/)

[Schiavi G, et al, DYNC1I2 mutations causing malformations of cortical development (2022)](https://pubmed.ncbi.nlm.nih.gov/35731248/)

[Bastidas-Ponce A, et al, Dynein intermediate chain 2 in neuronal development and disease (2022)](https://pubmed.ncbi.nlm.nih.gov/35586228/)

[Leidel C, et al, Dynein-based transport during cell division and neuronal function (2016)](https://pubmed.ncbi.nlm.nih.gov/27236515/)

[Wang T, et al, Axonal transport defects and neurodegeneration: from mechanisms to therapeutic strategies (2021)](https://pubmed.ncbi.nlm.nih.gov/34049793/)

[Lipinski MM, et al, Dynein-based transport during autophagy (2009)](https://pubmed.ncbi.nlm.nih.gov/19521623/)

📖 View canonical wiki page →

Related Entities

DYNC1I2PROTEIN

▸Metadataorigin_type: v1_polymorphic_backfill

slug	proteins-dync1i2-protein
kg_node_id	DYNC1I2PROTEIN
entity_type	protein
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-a17b1e89805c
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'proteins-dync1i2-protein'}
_schema_version	1

📊 Evidence Profile

Evidence Balance

+0%

Certainty

45%

Debates

0

Incoming

9

Outgoing

11

0 supporting 0 contradicting 0 neutral

View full evidence profile →

Public annotations (0)Annotate on Hypothes.is →

No public annotations yet.

📗 Cite This Artifact

DYNC1I2 Protein

DYNC1I2 Protein

Overview

DYNC1I2 Protein

Overview

Protein Information

Structure

Domain Architecture

Complex Architecture

Normal Function

Retrograde Axonal Transport

Mechanism of Force Generation

Cellular Functions

Role in Neurodegeneration

Axonal Transport Deficits

Hereditary Spastic Paraplegia (HSP)

Malformations of Cortical Development

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis (ALS)

Mechanism of Action

Therapeutic Approaches

Targeting Axonal Transport

Challenges

Cross-Linking Relationships

Disease Associations

See Also

External Links

References

💬 Discussion

📗 Cite This Artifact

DYNC1I2 Protein

DYNC1I2 Protein

Overview

DYNC1I2 Protein

Overview

Protein Information

Structure

Domain Architecture

Complex Architecture

Normal Function

Retrograde Axonal Transport

Mechanism of Force Generation

Cellular Functions

Role in Neurodegeneration

Axonal Transport Deficits

Hereditary Spastic Paraplegia (HSP)

Malformations of Cortical Development

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis (ALS)

Mechanism of Action

Therapeutic Approaches

Targeting Axonal Transport

Challenges

Cross-Linking Relationships

Related Proteins

Related Pathways

Disease Associations

See Also

External Links

References

💬 Discussion