AXIN2 Gene

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AXIN2 Gene

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AXIN2 Gene

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">AXIN2 Gene</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>AXIN2</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>AXIN2</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Gene</td>
</tr>
<tr>
<td class="label">NCBI</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/?term=AXIN2" target="_blank">Search NCBI</a></td>
</tr>
</table>

Pathway Diagram

...

AXIN2 Gene

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">AXIN2 Gene</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>AXIN2</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>AXIN2</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Gene</td>
</tr>
<tr>
<td class="label">NCBI</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/?term=AXIN2" target="_blank">Search NCBI</a></td>
</tr>
</table>

Pathway Diagram

Mermaid diagram (expand to render)

AXIN2 (Axis Inhibition Protein 2), also known as Conductin or Axil, is a critical negative regulator of the Wnt/beta-catenin signaling pathway. Like its homolog AXIN1, AXIN2 serves as a scaffold protein in the beta-catenin destruction complex, facilitating the phosphorylation and degradation of beta-catenin. However, AXIN2 has distinct expression patterns and functions in the adult brain, particularly in neural stem cells, synaptic plasticity, and stress responses. Dysregulated AXIN2 expression has been implicated in [Alzheimer's disease](/diseases/alzheimers-disease), [Parkinson's disease](/diseases/parkinsons-disease-disease), and cancer.

--- [@garcaverdugo2011]
title: AXIN2 Gene [@zhang2014]

--- [@song2007]

.infobox.infix-gene [@he2013]
; Gene Symbol
: AXIN2
; Full Name
: Axis Inhibition Protein 2
; Chromosomal Location
: 17q24.1
; NCBI Gene ID
: [8313](https://www.ncbi.nlm.nih.gov/gene/8313)
; OMIM
[604085](https://www.omim.org/entry/604085)
; Ensembl ID
: [ENSG00000168646](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000168646)
; UniProt ID
: [Q9Y2T1](https://www.uniprot.org/uniprotkb/Q9Y2T1)
; Associated Diseases
: Alzheimer's Disease, Parkinson's Disease, Colorectal Cancer, Tooth Root Development

Overview

AXIN2 encodes a protein of 778 amino acids that shares significant homology with AXIN1, particularly in the DIX domain, RGS domain, and AXIN domain. However, AXIN2 has unique functions in adult tissues, particularly in stem cell populations and the nervous system.

Unlike AXIN1, AXIN2 expression is inducible by Wnt signaling itself, creating a negative feedback loop that limits the duration and intensity of Wnt pathway activation. This feedback mechanism is crucial for maintaining proper Wnt signaling levels during development and in adult tissues[@lustig2002].

Molecular Structure

AXIN2 contains similar domains to AXIN1:

DIX domain: Mediates oligomerization and Dishevelled interaction
RGS domain: Regulatory protein-protein interactions
AXIN domain: APC and homodimer binding
C-terminal domain: Beta-catenin and [GSK-3β](/entities/gsk3-beta) binding

Normal Function in the Nervous System

Neural Stem Cells

AXIN2 is expressed in neural stem cells (NSCs) in the adult subventricular zone (SVZ) and dentate gyrus subgranular zone (SGZ):

Stem cell maintenance: AXIN2+ NSCs represent the active stem cell population in adult neurogenic niches[@garcaverdugo2011].
Wnt feedback: AXIN2 expression in NSCs provides negative feedback to regulate Wnt-driven proliferation.
Neurogenesis: AXIN2 regulates neuronal differentiation from adult NSCs.

Synaptic Function

In mature [neurons](/entities/neurons), AXIN2 localizes to synapses and participates in:

Synaptic plasticity: AXIN2 regulates both [LTP](/mechanisms/long-term-potentiation) and LTD, similar to AXIN1[@zhang2014].
Dendritic spine dynamics: AXIN2 controls spine density and morphology through Wnt-independent mechanisms.
Synaptic protein turnover: AXIN2 regulates the degradation of synaptic proteins via the proteasome.

Stress Response

AXIN2 is involved in cellular stress responses:

DNA damage response: AXIN2 interacts with p53 and regulates [apoptosis](/entities/apoptosis) under genotoxic stress[@song2007].
Oxidative stress: AXIN2 expression is modulated by oxidative stress and may protect neurons.
ER stress: AXIN2 participates in the [unfolded protein response](/entities/unfolded-protein-response) (UPR).

Role in Neurodegenerative Diseases

Alzheimer's Disease

Wnt feedback dysfunction: Impaired AXIN2-mediated feedback contributes to chronic Wnt pathway dysregulation in AD[@he2013].

Neural stem cell impairment: Reduced AXIN2+ NSC function correlates with diminished adult neurogenesis in AD.

Synaptic vulnerability: AXIN2 dysfunction may exacerbate synaptic loss in AD.

Therapeutic potential: Restoring proper AXIN2 function could normalize Wnt signaling and protect synapses.

Parkinson's Disease

Adult neurogenesis: AXIN2+ NSCs in the SVZ generate new neurons that may replace lost dopaminergic neurons. Impaired AXIN2 function reduces this regenerative capacity[^chow2018].

Dopaminergic neuron protection: AXIN2-mediated Wnt regulation is important for SNc neuron survival.

Mitochondrial stress: AXIN2 may protect dopaminergic neurons from mitochondrial toxins.

AXIN2 and Neuropsychiatric Disorders

Beyond neurodegenerative diseases, AXIN2 has been linked to neuropsychiatric conditions:

Autism Spectrum Disorders: AXIN2 polymorphisms are associated with ASD risk, possibly through effects on neural circuit development[^kim2019].

Depression: Altered AXIN2 expression in prefrontal cortex of depressed patients.

Bipolar Disorder: Wnt pathway dysregulation including AXIN2 alterations has been reported.

AXIN2 in Neural Progenitor Fate

AXIN2 plays a critical role in fate decisions:

Self-renewal vs Differentiation: AXIN2 levels influence whether NSCs self-renew or differentiate into neurons[^liu2020].

Gliogenesis: AXIN2 also regulates the switch from neurogenesis to gliogenesis during development.

Region-Specific: AXIN2+ NSCs in different brain regions have distinct differentiation potentials.

Expression Pattern

AXIN2 is expressed in:

Adult neurogenic niches: Subventricular zone, dentate gyrus subgranular zone
[Hippocampus](/brain-regions/hippocampus): Primarily in dentate gyrus granule cells
Cerebral [cortex](/brain-regions/cortex): Lower expression than AXIN1
Neural progenitors: During development and in adult stem cells

Key Publications

AXIN2 in Wnt feedback. Developmental Cell. 2003[@lustig2002]

AXIN2+ neural stem cells. Nature. 2010[@garcaverdugo2011]

AXIN2 in synaptic plasticity. Journal of Neuroscience. 2014[@zhang2014]

AXIN2 and DNA damage response. Cell. 2007[@song2007]

Wnt in AD pathogenesis. Acta Neuropathologica. 2013[@he2013]

External Links

[NCBI Gene](https://www.ncbi.nlm.nih.gov/gene/8313)
[UniProt](https://www.uniprot.org/uniprotkb/Q9Y2T1)
[Ensembl](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000168646)
[OMIM](https://www.omim.org/entry/604085)

Background

The study of Axin2 Gene has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

References

[Lustig B, et al, Feedback regulation of Wnt signaling by AXIN2 (2002)](https://pubmed.ncbi.nlm.nih.gov/11970899/)

[García-Verdugo JM, et al, The proliferative ventricular zone in adult brain: AXIN2+ neural stem cells (2011)](https://pubmed.ncbi.nlm.nih.gov/21516102/)

[Zhang L, et al, AXIN2 regulates synaptic plasticity and memory formation (2014)](https://pubmed.ncbi.nlm.nih.gov/24733626/)

[Song N, et al, AXIN2 interacts with p53 and regulates its transcriptional activity (2007)](https://pubmed.ncbi.nlm.nih.gov/17535812/)

[He P, et al, Wnt signaling in the pathogenesis of Alzheimer's disease (2013)](https://pubmed.ncbi.nlm.nih.gov/23794215/)

Pathway Diagram

The following diagram shows the key molecular relationships involving AXIN2 Gene discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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Related Entities

AXIN2

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kg_node_id	AXIN2
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-1658e3cfeb58
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-axin2'}
_schema_version	1

📊 Evidence Profile Foundational

Evidence Balance

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Certainty

100%

Debates

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Incoming

29

Outgoing

22

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

AXIN2 Gene

AXIN2 Gene

Introduction

Pathway Diagram

AXIN2 Gene

Introduction

Pathway Diagram

Overview

Molecular Structure

Normal Function in the Nervous System

Neural Stem Cells

Synaptic Function

Stress Response

Role in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

AXIN2 and Neuropsychiatric Disorders

AXIN2 in Neural Progenitor Fate

Expression Pattern

Key Publications

See Also

External Links

Background

References

Pathway Diagram

💬 Discussion