FERMT2 Gene

FERMT2 Gene

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">FERMT2 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>FERMT2</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Fermitin Family Member 2</td>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Kindlin-2 (MITD2)</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>14q22.1</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>10979</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000173702</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9BUF5</td>
</tr>
<tr>
<td class="label">OMIM ID</td>
<td>614365</td>
</tr>
<tr>
<td class="label">Domain</td>
<td>Location</td>
</tr>
<tr>
<td class="label">F0 domain</td>
<td>N-terminus</td>
</tr>
<tr>
<td class="label">F1 domain</td>
<td>Central</td>
</tr>
<tr>
<td class="label">F2 domain</td>
<td>Central</td>
</tr>
<tr>
<td class="label">F3 domain</td>
<td>C-terminus</td>
</tr>
<tr>
<td class="label">PH domain</td>
<td>C-terminus</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Rationale</td>
</tr>
<tr>
<td class="label">Integrin modulators</td>
<td>Modulate integrin-kindlin interaction</td>
</tr>
<tr>
<td class="label">Microglial targeting</td>
<td>Enhance Aβ clearance</td>
</tr>
<tr>
<td class="label">**BBB prot

FERMT2 Gene

Overview

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">FERMT2 Gene</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>FERMT2</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Fermitin Family Member 2</td>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Kindlin-2 (MITD2)</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>14q22.1</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>10979</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000173702</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9BUF5</td>
</tr>
<tr>
<td class="label">OMIM ID</td>
<td>614365</td>
</tr>
<tr>
<td class="label">Domain</td>
<td>Location</td>
</tr>
<tr>
<td class="label">F0 domain</td>
<td>N-terminus</td>
</tr>
<tr>
<td class="label">F1 domain</td>
<td>Central</td>
</tr>
<tr>
<td class="label">F2 domain</td>
<td>Central</td>
</tr>
<tr>
<td class="label">F3 domain</td>
<td>C-terminus</td>
</tr>
<tr>
<td class="label">PH domain</td>
<td>C-terminus</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Rationale</td>
</tr>
<tr>
<td class="label">Integrin modulators</td>
<td>Modulate integrin-kindlin interaction</td>
</tr>
<tr>
<td class="label">Microglial targeting</td>
<td>Enhance Aβ clearance</td>
</tr>
<tr>
<td class="label">BBB protection</td>
<td>Maintain endothelial function</td>
</tr>
<tr>
<td class="label">Anti-inflammatory</td>
<td>Reduce neuroinflammation</td>
</tr>
<tr>
<td class="label">Region</td>
<td>Expression Level</td>
</tr>
<tr>
<td class="label">Cerebral cortex</td>
<td>High</td>
</tr>
<tr>
<td class="label">Hippocampus</td>
<td>High</td>
</tr>
<tr>
<td class="label">Cerebellum</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Basal ganglia</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Substantia nigra</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Cell Type</td>
<td>Expression</td>
</tr>
<tr>
<td class="label">Neurons</td>
<td>High</td>
</tr>
<tr>
<td class="label">Astrocytes</td>
<td>High</td>
</tr>
<tr>
<td class="label">Microglia</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Endothelial cells</td>
<td>Moderate</td>
</tr>
<tr>
<td class="label">Oligodendrocytes</td>
<td>Low</td>
</tr>
<tr>
<td class="label">Protein</td>
<td>Interaction Type</td>
</tr>
<tr>
<td class="label">Integrins (β1, β3, β5)</td>
<td>Direct binding</td>
</tr>
<tr>
<td class="label">Talin</td>
<td>Cooperative binding</td>
</tr>
<tr>
<td class="label">Vinculin</td>
<td>Focal adhesion</td>
</tr>
<tr>
<td class="label">Paxillin</td>
<td>Focal adhesion</td>
</tr>
<tr>
<td class="label">FAK</td>
<td>Signaling</td>
</tr>
<tr>
<td class="label">ILK</td>
<td>Signaling complex</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/alzheimer's-disease" style="color:#ef9a9a">Alzheimer's disease</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">44 edges</a></td>
</tr>
</table>

FERMT2 (Fermitin Family Member 2), also known as Kindlin-2 or MITD2 (Mitogen-Induced Domain-2), encodes a member of the fermitin family of proteins. Kindlin-2 is a critical integrin-activating protein that plays essential roles in cell adhesion, focal adhesion formation, actin cytoskeleton organization, and cell migration. Genome-wide association studies (GWAS) have identified FERMT2 as a risk gene for late-onset Alzheimer's disease (LOAD), making it a protein of significant interest in neurodegeneration research[@lambert2013].

Structure and Function

Protein Structure

Kindlin-2 is a ~80 kDa protein containing several key domains:

Integrin Activation (Inside-Out Signaling)

Kindlin-2 is a key activator of integrin receptors through "inside-out" signaling:

Kindlin-2 and talin form a functional complex that fully activates integrins—neither alone is sufficient for maximal activation[@ushio2017].

Subcellular Localization

Kindlin-2 is primarily localized to:

• Focal adhesions (cell-matrix adhesion sites)
• Cytoplasmic vesicles
• Nucleus (in some cell types)
• Cell-cell junctions (in epithelial cells)

Normal Physiological Functions

Cell-Matrix Adhesion

Kindlin-2 is essential for:

• Integrin activation: Inside-out signaling for integrin function
• Focal adhesion formation: Recruitment of adhesion proteins
• Adhesion maturation: Transition from nascent to stable adhesions
• Cell spreading: Initial attachment and spreading on substrates

Actin Cytoskeleton Organization

Through interactions with various partners:

• Actin-binding proteins: Regulates actin polymerization
• Vinculin: Links focal adhesions to actin
• Alpha-actinin: Cross-links actin filaments

Cell Migration

Kindlin-2 regulates:

• Lamellipodia formation
• Focal adhesion turnover
• Traction force generation
• Directional migration[@yu2015]

Role in Neurodegenerative Diseases

Alzheimer's Disease

FERMT2 has emerged as a significant AD risk gene through GWAS[@kelley2018]:

GWAS Evidence:

• Multiple independent studies confirm association
• Common variants with modest effect size
• Expression quantitative trait loci (eQTLs) affect FERMT2 expression

• Kindlin-2 may influence APP processing
• Integrin-Aβ interactions affect Aβ clearance
• αvβ3/αvβ5 integrins involved in Aβ uptake by microglia

• Kindlin-2 may affect tau phosphorylation
• Integrin signaling modulates tau kinases
• Possible role in tau spread[@liu2019]

• Kindlin-2 in microglia affects inflammatory responses
• Integrin-mediated phagocytosis
• Cytokine production regulation[@xie2018]

• Kindlin-2 in brain endothelial cells
• May affect BBB integrity
• Aβ transport across BBB[he2017]

• FERMT2 expression altered in AD brain
• Genetic variants associated with AD risk
• Protein levels correlate with disease severity

Parkinson's Disease

While not a primary GWAS hit, FERMT2 may play roles:

• Expressed in dopaminergic neurons
• May affect neuronal survival
• Altered expression in PD models
• Possible interaction with α-synuclein

Multiple Sclerosis

• Altered FERMT2 expression in demyelinating lesions
• May affect oligodendrocyte function
• Integrin signaling in immune cell trafficking

Clinical Significance

Alzheimer's Disease Risk

• Genetic association: FERMT2 is a confirmed AD risk locus
• Effect size: Modest odds ratio (~1.1-1.2 per risk allele)
• Population-specific effects: May vary across ancestries

Cancer

FERMT2 is overexpressed in several cancers:

• Breast cancer
• Lung cancer
• Colorectal cancer
• Glioma

Therapeutic Implications

Targeting Strategies

Challenges

• Peripheral vs. CNS targeting: Must cross the BBB
• Integrin redundancy: Multiple kindlins and integrins
• Cancer risk: Overexpression in tumors

Expression Pattern

Brain Regions

FERMT2 is expressed in multiple brain regions:

Cell Type Specificity

Key Interactions

Animal Models

Knockout Mice

• Fermt2-/-: Embryonic lethal (developmental defects)
• Conditional knockouts: Brain-specific deletion viable
• Phenotype: Altered integrin signaling, adhesion defects

Transgenic Models

• AD models: Crossed with APP/PS1 mice
• Overexpression: Neuronal FERMT2 overexpression
• Humanized: Express AD-associated variants

Research Methods

Genetic Studies

• GWAS meta-analysis
• Whole-exome sequencing
• eQTL mapping

Molecular Biology

• siRNA/shRNA knockdown
• CRISPR-Cas9 editing
• Co-immunoprecipitation

Imaging

• Immunofluorescence for focal adhesions
• Live-cell imaging for adhesion dynamics
• Super-resolution microscopy

See Also

• [FERMT2 Protein (Kindlin-2)](/proteins/kindlin-2-protein)
• [Integrin Signaling](/mechanisms/integrin-pathway)
• [Alzheimer's Disease Risk Genes](/mechanisms/ad-genetic-risk)
• [Blood-Brain Barrier](/entities/blood-brain-barrier)
• [Integrins in Neurodegeneration](/mechanisms/integrins-neurodegeneration)

References

Pathway Diagram

The following diagram shows the key molecular relationships involving FERMT2 Gene discovered through SciDEX knowledge graph analysis: