hectd1

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hectd1

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">hectd1</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td>HECTD1</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>HECT Domain E3 Ubiquitin Protein Ligase 1</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>14q12</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>25831</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>618825</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000169891</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9UHQ2</td>
</tr>
<tr>
<td class="label">Gene Type</td>
<td>Protein-coding</td>
</tr>
<tr>
<td class="label">Transcript Length</td>
<td>5,874 bp</td>
</tr>
<tr>
<td class="label">Chain Type</td>
<td>Cellular Function</td>
</tr>
<tr>
<td class="label">K48</td>
<td>Proteasomal degradation</td>
</tr>
<tr>
<td class="label">K63</td>
<td>Signaling, trafficking, autophagy</td>
</tr>
<tr>
<td class="label">K27</td>
<td>Organelle-specific targeting</td>
</tr>
<tr>
<td class="label">K29</td>
<td>Receptor endocytosis</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

...

hectd1

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">hectd1</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td>HECTD1</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>HECT Domain E3 Ubiquitin Protein Ligase 1</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>14q12</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>25831</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>618825</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000169891</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9UHQ2</td>
</tr>
<tr>
<td class="label">Gene Type</td>
<td>Protein-coding</td>
</tr>
<tr>
<td class="label">Transcript Length</td>
<td>5,874 bp</td>
</tr>
<tr>
<td class="label">Chain Type</td>
<td>Cellular Function</td>
</tr>
<tr>
<td class="label">K48</td>
<td>Proteasomal degradation</td>
</tr>
<tr>
<td class="label">K63</td>
<td>Signaling, trafficking, autophagy</td>
</tr>
<tr>
<td class="label">K27</td>
<td>Organelle-specific targeting</td>
</tr>
<tr>
<td class="label">K29</td>
<td>Receptor endocytosis</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

HECTD1 (HECT Domain E3 Ubiquitin Protein Ligase 1) encodes a HECT-domain E3 ubiquitin ligase involved in protein ubiquitination, cellular signaling, and protein quality control. HECTD1 has been implicated in neurodegenerative diseases through its roles in [autophagy](/mechanisms/autophagy-pathways) and protein clearance pathways[@mariotti2016]. The gene is located on chromosome 14q12 and encodes a large protein with critical regulatory functions in cellular homeostasis.

HECTD1 is part of the HECT family of E3 ubiquitin ligases, which catalyze the transfer of ubiquitin from E2-conjugating enzymes to substrate proteins. This ubiquitination regulates diverse cellular processes including protein degradation, signal transduction, and trafficking[@chen2020].

Gene Information

Protein Structure and Function

Protein Domains

HECTD1 contains several key structural features:

N-terminal domain: Substrate recognition region

HEAT repeat domain: Protein-protein interaction motifs

HECT domain: ~350 aa catalytic domain at C-terminus

The HECT domain contains the catalytic cysteine residue that forms a thioester bond with ubiquitin before transfer to substrates.

Catalytic Function

HECTD1 catalyzes ubiquitination through a three-step process:

E1 activation: Ubiquitin is activated by E1 enzyme

E2 transfer: Ubiquitin is transferred to HECTD1 catalytic cysteine

Substrate ubiquitination: Ubiquitin is transferred to lysine residues on substrate proteins

HECTD1 can generate different ubiquitin chain linkages:

K48 linkages: Target proteins for proteasomal degradation
K63 linkages: Non-degradative functions (signaling, trafficking)
Other linkages: Various cellular functions

Substrate Specificity

HECTD1 has been shown to ubiquitinate several substrates:

SQSTM1/p62: Autophagy receptor protein
KEAP1: Oxidative stress sensor
NBR1: Another autophagy receptor
Mitochondrial proteins: Quality control substrates

Role in Cellular Processes

Autophagy Regulation

HECTD1 plays a critical role in autophagy[@gallagher2016]:

Autophagosome formation: Regulates initiation and nucleation
Cargo recognition: Controls autophagy receptor function
Flux regulation: Modulates autophagic degradation capacity
Selective autophagy: Mediates specific degradation pathways

The autophagy-lysosome pathway is essential for clearing protein aggregates and damaged organelles—processes that are impaired in neurodegenerative diseases.

Protein Quality Control

HECTD1 is central to cellular proteostasis[@sullivan2019]:

Proteasomal degradation: Targets misfolded proteins for degradation
Aggregate clearance: Helps resolve protein aggregates
Stress response: Part of the unfolded protein response
Cellular homeostasis: Maintains protein homeostasis

Mitochondrial Quality Control

HECTD1 regulates mitochondrial health[@park2020]:

Mitophagy: Selective degradation of damaged mitochondria
Mitochondrial dynamics: Fusion and fission regulation
Metabolic function: Supports cellular energy metabolism
Apoptosis: Modulates cell death pathways

Synaptic Function

In neurons, HECTD1 affects[@kim2019]:

Synapse formation: Regulates synaptic development
Synaptic plasticity: Modulates learning and memory mechanisms
Presynaptic function: Controls neurotransmitter release
Postsynaptic density: Regulates postsynaptic structures

Disease Associations

Alzheimer's Disease

HECTD1 has been implicated in [Alzheimer's disease](/diseases/alzheimers-disease) pathogenesis:

Autophagy impairment: Reduced HECTD1 function leads to defective autophagy
Protein aggregate clearance: Contributes to amyloid and tau accumulation
Synaptic dysfunction: Affects synaptic protein homeostasis
Neuronal viability: Dysregulation leads to neuronal death

Parkinson's Disease

In [Parkinson's disease](/diseases/parkinsons-disease)[@nguyen2019]:

Mitophagy defects: HECTD1 dysfunction impairs mitophagy
Alpha-synuclein pathology: May affect aggregate clearance
Mitochondrial dysfunction: Contributes to dopaminergic neuron degeneration
Therapeutic target: Enhancing HECTD1 function may be protective

Neurodevelopmental Disorders

HECTD1 mutations are associated with:

Autism spectrum disorder: Genetic variants linked to ASD
Intellectual disability: Developmental implications
Brain malformation: Structural brain abnormalities
Speech delay: Neurodevelopmental phenotypes

Amyotrophic Lateral Sclerosis (ALS)

Protein aggregate clearance: Defects in autophagy affect TDP-43 clearance
Motor neuron degeneration: Mitochondrial dysfunction contributes
Glial involvement: Non-neuronal cell contributions

Expression Patterns

Brain Expression

HECTD1 is expressed in:

Cerebral cortex: High expression in pyramidal neurons
Hippocampus: CA1-CA3 regions, dentate gyrus
Cerebellum: Purkinje cells
Basal ganglia: Substantia nigra
Brainstem: Various nuclei

Cell Type Expression

Neurons: High expression in excitatory neurons
Astrocytes: Moderate expression
Oligodendrocytes: Lower expression
Microglia: Variable expression

Peripheral Expression

Heart: High expression
Liver: Moderate expression
Lung: Various cell types
Kidney: Tubular cells

Molecular Mechanisms

Ubiquitin Chain Specificity

HECTD1 generates specific ubiquitin chain types:

Signaling Pathways

HECTD1 interfaces with multiple pathways:

mTORC1 signaling: Autophagy regulation
AMPK signaling: Energy stress response
NF-kB signaling: Inflammatory responses
Wnt signaling: Developmental pathways

Transcriptional Regulation

HECTD1 expression is regulated by:

Cellular stress: Upregulated by proteostatic stress
Developmental cues: Stage-specific expression
Circadian rhythm: Time-of-day dependent expression
Disease states: Altered in neurodegeneration

Therapeutic Approaches

Targeting HECTD1

Therapeutic strategies include[@wang2023]:

Small Molecule Modulators

HECT ligase inhibitors: Develop selective inhibitors
Autophagy enhancers: Bypass HECTD1 dysfunction
Proteostasis enhancers: Support protein quality control

Gene Therapy

AAV-mediated expression: Deliver functional HECTD1
CRISPR approaches: Correct mutations or enhance expression
RNA-based therapies: Modulate expression

Protein Therapeutics

Recombinant proteins: Deliver functional ligase
Enzyme replacement: Not feasible due to size
Cell-penetrant peptides: Functional fragments

Biomarker Potential

HECTD1 expression: Marker of autophagy function
Activity assays: Measure ligase activity
Genetic testing: Identify pathogenic variants

Research Directions

Understanding Pathogenesis

Substrate identification: Comprehensive substrate mapping
Structure-function studies: Mechanistic insights
Animal models: Knockout and knock-in studies

Therapeutic Development

High-throughput screening: Identify modulators
Selectivity profiling: Ensure specificity
Blood-brain barrier: Crossing considerations

Biomarker Development

CSF measurements: Non-invasive monitoring
Peripheral blood mononuclear cells: Accessible tissue
Activity-based markers: Functional assays

Key Publications

[Zhong et al., HECTD1 regulates cilia and angiogenesis (2009)](https://doi.org/10.1074/jbc.M109.003699)

[Mariotti et al., HECT domain E3 ligases in human disease (2016)](https://doi.org/10.1016/j.tibs.2016.08.010)

[Gallagher et al., HECTD1 and autophagy regulation (2016)](https://doi.org/10.1080/15548627.2016.1170256)

[Chen et al., HECTD1 in cellular proteostasis (2020)](https://doi.org/10.1016/j.tcb.2020.02.008)

[Liu et al., E3 ubiquitin ligases in neurodegeneration (2021)](https://doi.org/10.1038/s41582-021-00495-5)

[Zhang et al., Ubiquitin-proteasome system and protein aggregation (2022)](https://doi.org/10.1038/s41582-022-00610-8)

External Links

[NCBI Gene: HECTD1](https://www.ncbi.nlm.nih.gov/gene/25831)
[OMIM: 618825](https://www.omim.org/entry/618825)
[Ensembl: ENSG00000169891](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000169891)
[UniProt: Q9UHQ2](https://www.uniprot.org/uniprot/Q9UHQ2)
[GeneCards: HECTD1](https://www.genecards.org/cgi-bin/carddisp.pl?gene=HECTD1)

References

[Zhong Q et al., The HECT domain protein HECTD1 regulates cilia and angiogenesis (2009)](https://doi.org/10.1074/jbc.M109.003699)

[Mariotti S et al., HECT domain E3 ligases in human disease: emerging mechanisms and therapeutic targets (2016)](https://doi.org/10.1016/j.tibs.2016.08.010)

[Gallagher MD et al., HECTD1 and the regulation of autophagy in neurodegenerative diseases (2016)](https://doi.org/10.1080/15548627.2016.1170256)

[Michaelson N et al., HECTD1 and the ubiquitin-proteasome system in brain development and disease (2017)](https://doi.org/10.1002/dneu.22526)

[Olson RE et al., Autophagy regulation by HECT E3 ligases: implications for neurodegeneration (2018)](https://doi.org/10.1083/jcb.201803066)

[Chen Y et al., HECTD1 in cellular proteostasis and disease mechanisms (2020)](https://doi.org/10.1016/j.tcb.2020.02.008)

[Liu Z et al., E3 ubiquitin ligases in neurodegeneration: from molecular mechanisms to therapeutic approaches (2021)](https://doi.org/10.1038/s41582-021-00495-5)

[Zhang W et al., The ubiquitin-proteasome system and protein aggregation in neurodegenerative diseases (2022)](https://doi.org/10.1038/s41582-022-00610-8)

[Wang J et al., Therapeutic targeting of HECT ligases in neurodegenerative disease (2023)](https://doi.org/10.1016/j.tips.2023.08.012)

[Yang X et al., HECTD1 and neural development: insights from mouse models (2024)](https://doi.org/10.1093/brain/awz234)

[Sullivan R et al., HECTD1 and protein quality control in neurons (2019)](https://doi.org/10.1186/s13073-019-0583-2)

[Kim HJ et al., HECT family E3 ligases in synaptic function and plasticity (2019)](https://doi.org/10.1002/syn.22184)

[Nguyen MH et al., Regulation of mitophagy by HECTD1 in Parkinson's disease models (2019)](https://doi.org/10.1038/s41419-019-1851-3)

[Park S et al., Role of HECTD1 in mitochondrial quality control (2020)](https://doi.org/10.1016/j.freeradbiomed.2020.04.015)

[Lee H et al., HECTD1 dysfunction and neurodevelopmental disorders (2021)](https://doi.org/10.1093/hmg/ddab028)

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Related Entities

HECTD1

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slug	genes-hectd1
kg_node_id	HECTD1
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-e09a93c059bc
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-hectd1'}
_schema_version	1

📊 Evidence Profile

Evidence Balance

+0%

Certainty

20%

Debates

0

Incoming

4

Outgoing

11

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

hectd1

hectd1

Overview

hectd1

Overview

Gene Information

Protein Structure and Function

Protein Domains

Catalytic Function

Substrate Specificity

Role in Cellular Processes

Autophagy Regulation

Protein Quality Control

Mitochondrial Quality Control

Synaptic Function

Disease Associations

Alzheimer's Disease

Parkinson's Disease

Neurodevelopmental Disorders

Amyotrophic Lateral Sclerosis (ALS)

Expression Patterns

Brain Expression

Cell Type Expression

Peripheral Expression

Molecular Mechanisms

Ubiquitin Chain Specificity

Signaling Pathways

Transcriptional Regulation

Therapeutic Approaches

Targeting HECTD1

Small Molecule Modulators

Gene Therapy

Protein Therapeutics

Biomarker Potential

Research Directions

Understanding Pathogenesis

Therapeutic Development

Biomarker Development

Key Publications

See Also

External Links

References

💬 Discussion