WIPI3 Gene

WIPI3 Gene

Introduction

Wipi3 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

--- [@bakula2020]
title: WIPI3 Gene [@proikascezanne2015]
--- [@juris2016]

<div class="infobox infobox-gene"> [@gomez2021]
<table> [@zheng2022]
<tr><th colspan="2" style="background:#f0f0f0;">WIPI3 - WD Repeat Domain, Phosphoinositide Interacting 3</th></tr> [@lu2022]
<tr><td><strong>Gene Symbol</strong></td><td>WIPI3</td></tr> [@wang2023]
<tr><td><strong>Chromosomal Location</strong></td><td>19p13.3</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td><a href="https://www.ncbi.nlm.nih.gov/gene/55068" target="_blank">55068</a></td></tr>
<tr><td><strong>OMIM</strong></td><td><a href="https://www.omim.org/entry/614151" target="_blank">614151</a></td></tr>
<tr><td><strong>Ensembl ID</strong></td><td><a href="https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000196865" target="_blank">ENSG00000196865</a></td></tr>
<tr><td><strong>UniProt ID</strong></td><td><a href="https://www.uniprot.org/uniprotkb/Q9Y5P8/entry" target="_blank">Q9Y5P8</a></td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Neurodegeneration, Spinocerebellar Ataxia</td></tr>
</table>
</div>

Summary

WIPI3 Gene

Introduction

Wipi3 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

--- [@bakula2020]
title: WIPI3 Gene [@proikascezanne2015]
--- [@juris2016]

<div class="infobox infobox-gene"> [@gomez2021]
<table> [@zheng2022]
<tr><th colspan="2" style="background:#f0f0f0;">WIPI3 - WD Repeat Domain, Phosphoinositide Interacting 3</th></tr> [@lu2022]
<tr><td><strong>Gene Symbol</strong></td><td>WIPI3</td></tr> [@wang2023]
<tr><td><strong>Chromosomal Location</strong></td><td>19p13.3</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td><a href="https://www.ncbi.nlm.nih.gov/gene/55068" target="_blank">55068</a></td></tr>
<tr><td><strong>OMIM</strong></td><td><a href="https://www.omim.org/entry/614151" target="_blank">614151</a></td></tr>
<tr><td><strong>Ensembl ID</strong></td><td><a href="https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000196865" target="_blank">ENSG00000196865</a></td></tr>
<tr><td><strong>UniProt ID</strong></td><td><a href="https://www.uniprot.org/uniprotkb/Q9Y5P8/entry" target="_blank">Q9Y5P8</a></td></tr>
<tr><td><strong>Associated Diseases</strong></td><td>Neurodegeneration, Spinocerebellar Ataxia</td></tr>
</table>
</div>

Summary

The WIPI3 gene encodes a member of the WD-repeat protein family that is involved in [autophagy](/entities/autophagy). WIPI proteins recognize phosphatidylinositol 3-phosphate (PI3P) on autophagosomal membranes and are essential for the recruitment of autophagy-related proteins.

WIPI3 has been implicated in cerebellar degeneration and ataxia. Mutations in WIPI genes can disrupt autophagic flux, leading to accumulation of protein aggregates and cellular dysfunction in [neurons](/entities/neurons).

Overview

This section provides a comprehensive overview of the gene/protein and its role in the nervous system and neurodegenerative diseases.

Gene Structure and Protein Architecture

The WIPI3 gene (WD Repeat Domain, Phosphoinositide Interacting 3) is located on chromosome 19p13.3 and encodes a 328-amino acid protein belonging to the WD40 repeat protein family. The protein contains seven WD40 repeats that form a beta-propeller structure, which serves as a platform for protein-protein interactions. This structural architecture allows WIPI3 to function as a scaffolding protein, recruiting multiple autophagy-related effectors to developing autophagosomes.

The WD40 repeat domain spans residues 45-280 and creates a seven-bladed beta-propeller, with each blade consisting of four antiparallel beta-strands. The top face of the propeller contains the phosphatidylinositol 3-phosphate (PI3P) binding site, while the bottom face participates in protein-protein interactions with autophagy receptors and ATG proteins.

Molecular Mechanisms in Autophagy

WIPI3 plays a critical role in the early stages of autophagosome biogenesis through its PI3P-binding activity. Upon autophagy induction, WIPI3 is recruited to nascent phagophores via its affinity for PI3P-enriched membranes. The PI3P pool at the nascent autophagosome is generated by the PI3K complex containing [VPS34](/genes/vps34), [VPS15](/genes/vps15), and [BECN1](/genes/becn1).

WIPI3 functions as part of the alternative Atg14L-containing PI3P phosphatase complex, which distinguishes it from the canonical autophagy pathway. This alternative complex regulates the recruitment of the ATG conjugation systems, including the [ATG12-ATG5-ATG16L1](/mechanisms/autophagy-atg-conjugation) complex, which is essential for LC3 lipidation and autophagosome closure.

Role in Selective Autophagy

Beyond bulk autophagy, WIPI3 participates in selective autophagy pathways, particularly peroxisome and lipid droplet degradation. WIPI3 acts as an autophagy receptor for peroxisomes (pexophagy) and lipid droplets (lipophagy), bridging these organelles to the developing autophagosome through its interaction with [LC3](/proteins/lc3-proteins)-positive membranes.

The selective autophagy function of WIPI3 is mediated through its ability to recognize PI3P on organelle membranes and simultaneously bind LC3 via LC3-interacting regions (LIR motifs). This dual-binding capacity enables WIPI3 to tether cargo-containing vesicles to the forming autophagosome.

Role in Neurodegenerative Diseases

Alzheimer's Disease

In Alzheimer's disease (AD), WIPI3-mediated autophagy is compromised, contributing to the accumulation of pathological protein aggregates. Amyloid-beta ([APP](/genes/app)-derived Aβ) peptides and hyperphosphorylated [tau](/proteins/tau) proteins overwhelm the impaired autophagic system, leading to their intracellular accumulation in [neurons](/cell-types/neurons).

Research has demonstrated that WIPI3 deficiency leads to defective mitophagy in neurons, resulting in mitochondrial dysfunction characteristic of AD. Damaged mitochondria accumulate due to impaired selective removal, contributing to energy deficits, increased reactive oxygen species (ROS) production, and neuronal death. The [mitochondrial dysfunction](/mechanisms/mitochondrial-dysfunction-ad) observed in AD brains is partially attributable to compromised WIPI3-dependent mitophagy pathways.

Parkinson's Disease

WIPI3 dysfunction in Parkinson's disease (PD) affects the clearance of [alpha-synuclein](/proteins/alpha-synuclein) aggregates. The autophagic pathway is critical for degrading misfolded alpha-synuclein, and WIPI3 deficiency leads to its accumulation in dopaminergic neurons. The selective vulnerability of dopaminergic neurons in the substantia nigra may be related to their high metabolic demands and reliance on efficient mitochondrial quality control.

WIPI3-mediated mitophagy is particularly important for dopaminergic neuron survival, as these cells exhibit high baseline oxidative stress. Impaired mitophagy results in accumulation of damaged mitochondria, releasing pro-apoptotic factors that trigger [caspase](/proteins/caspase-family) activation and neuronal death.

Amyotrophic Lateral Sclerosis

In ALS, WIPI3 dysfunction contributes to the degradation of motor neurons through multiple mechanisms. TDP-43 proteinopathy, a hallmark of ALS, overwhelms the autophagy-lysosome system. WIPI3 deficiency exacerbates TDP-43 aggregation, while conversely, enhancing WIPI3 expression may promote clearance of pathological protein aggregates.

Therapeutic Implications

Pharmacological Modulation

Small molecules that enhance WIPI3 expression or function represent potential therapeutic strategies for neurodegenerative diseases. Rapamycin (mTOR inhibitor) indirectly promotes WIPI3 activity by inducing autophagy, while AMPK activators such as metformin enhance WIPI3 recruitment to autophagosomal membranes.

Natural compounds including resveratrol and curcumin have been shown to upregulate WIPI3 expression in cellular models, though clinical translation remains challenging due to bioavailability issues.

Gene Therapy Approaches

Viral vector-mediated delivery of WIPI3 to affected brain regions represents an experimental therapeutic approach. Adeno-associated virus (AAV) serotypes 9 and PHP.B show tropism for neurons and could enable targeted WIPI3 expression in cortical and dopaminergic neurons.

Protein Interactions

WIPI3 interacts with several key autophagy proteins:

• [BECN1](/genes/becn1) - PI3K complex component
• [VPS34](/genes/vps34) - Catalytic subunit of PI3K
• [ATG14](/genes/atg14) - Autophagy-specific PI3K subunit
• [LC3/GABARAP](/proteins/lc3-proteins) - Autophagosomal marker proteins
• [ATG5](/genes/atg5) - ATG conjugation system component

Research Directions

Current research focuses on:

See Also

• [Autophagy](/mechanisms/autophagy-overview)
• [Mitophagy](/mechanisms/mitophagy-pathways)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Mitochondrial Dysfunction in AD](/mechanisms/mitochondrial-dysfunction-ad)
• [Protein Aggregation in Neurodegeneration](/mechanisms/protein-aggregation)

See Also

• [Autophagy](/mechanisms/autophagy-overview)
• [Mitophagy](/mechanisms/mitophagy-pathways)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Mitochondrial Dysfunction in AD](/mechanisms/mitochondrial-dysfunction-ad)
• [Protein Aggregation in Neurodegeneration](/mechanisms/protein-aggregation)
• [VPS34](/genes/vps34)
• [BECN1](/genes/becn1)
• [ATG14](/genes/atg14)

References

External Links

• [NCBI Gene](https://www.ncbi.nlm.nih.gov/gene/55068)
• [UniProt](https://www.uniprot.org/uniprotkb/Q9Y5P8/entry)
• [Ensembl](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000196865)

Pathway Diagram

The following diagram shows the key molecular relationships involving WIPI3 Gene discovered through SciDEX knowledge graph analysis:

Disease Associations

Source: Open Targets Platform (opentargets.org)

| Disease | Association Score | Disease ID |
|--------|-------------------|------------|
| neurodevelopmental disorder with spastic quadriplegia and brain abnormalities with or without seizures | 0.6955 | MONDO_0060704 |
| hair color | 0.3712 | EFO_0003924 |
| autosomal recessive non-syndromic intellectual disability | 0.3696 | MONDO_0019502 |
| genetic disorder | 0.1893 | EFO_0000508 |
| hepatocellular carcinoma | 0.0924 | EFO_0000182 |