TINF2 Gene

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TINF2 Gene

Introduction

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">TINF2 Gene</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td>TINF2</td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>TERF1 Interacting Nuclear Factor 2</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>14q12</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>26273</td>
</tr>
<tr>
<td class="label">OMIM</td>
<td>604319</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000024160</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9BSI4</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>451 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~52 kDa</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Tinf2 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.

Overview

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TINF2 Gene

Introduction

Tinf2 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.

Overview

TINF2 (TERF1 Interacting Nuclear Factor 2, also known as TIN2) encodes a critical component of the shelterin complex, which is essential for protecting telomeres from inappropriate DNA damage responses and maintaining telomere length homeostasis. TINF2 serves as the central scaffold that brings together the shelterin subunits TRF1, TRF2, and POT1, enabling proper telomere capping and regulation. Mutations in TINF2 cause severe telomere biology disorders including dyskeratosis congenita and related conditions with prominent neurological manifestations. The gene is located on chromosome 14q12 and encodes a 451-amino acid protein. [@palm2008]

Gene Information

Protein Structure

Domain Architecture

TINF2 contains several critical functional domains:

TRF1-Binding Domain (TBD): Amino acids 1-70

Binds to TRF1 dimerization domain
Mediates TINF2-TRF1 interaction
Essential for telomere length regulation

TRF2-Binding Domain: Amino acids 260-290

Interacts with TRF2 TRFH domain
Critical for T-loop formation
Prevents ATM pathway activation

POT1-Binding Region: Amino acids 300-350

Connects POT1 to the shelterin core
Regulates POT1 telomere occupancy
Controls C-rich strand access

C-terminal Dimerization Domain: Amino acids 400-451

Allows TINF2 dimerization
Enhances shelterin complex stability

Molecular Function

Shelterin Complex Assembly

TINF2 is the central organizer of the shelterin complex:

TRF1 Recruitment: TINF2 binds TRF1, recruiting it to double-stranded telomeric DNA
TRF2 Integration: Forms ternary complex with TRF1-TRF2
POT1 Tethering: Links POT1 to the core complex
Complex Stabilization: TINF2 dimerization enhances overall complex stability

Telomere Protection Functions

TINF2 enables critical shelterin protective functions:

T-loop Formation

Facilitates telomere end protection via lariat structure
Prevents detection as DNA double-strand breaks
Requires TRF2-TINF2 interaction

Replication Fork Protection

Prevents fork stalling at telomeres
Facilitates replication through telomeric repeats
Coordinates with CST complex

ATR Pathway Inhibition

Blocks RPA telomere loading
Prevents ATR activation at telomeres
Requires POT1-TINF2 interaction

Telomere Length Regulation

Controls telomerase access to telomere terminus
Regulates telomere elongation rates
Mediates length-dependent feedback

Expression and Regulation

Tissue Distribution

TINF2 is ubiquitously expressed with highest levels in:

Testis and ovaries (germ cells)
Bone marrow (hematopoietic stem cells)
Neural progenitor zones
Actively dividing somatic cells

Post-Translational Modification

Phosphorylation: Casein kinase 2 (CK2) phosphorylation regulates TINF2 function
Ubiquitination: TRF2-mediated ubiquitination affects shelterin dynamics
SUMOylation: Sumoylation influences nuclear localization

Role in Neurodegeneration

Telomere Biology Disorders

TINF2 mutations cause severe telomere maintenance defects:

Dyskeratosis Congenita (DC)

Most severe phenotype among shelterin mutations
Classic triad: nail dystrophy, oral leukoplakia, skin pigmentation
Progressive bone marrow failure
Neurological complications:
Developmental delay
Cerebellar ataxia
Intellectual disability
Peripheral neuropathy

Revesz Syndrome

Bilateral exudative retinopathy
Cerebellar hypoplasia
Learning disabilities
Early-onset bone marrow failure

Coats Plus Syndrome

Cerebellar calcifications
Retinal telangiectasias
Osteoporosis
Hematological manifestations

Neurodegenerative Disease Mechanisms

While TINF2 mutations cause rare syndromes, telomere dysfunction contributes to common neurodegenerative diseases:

Alzheimer's Disease

Telomere shortening correlates with disease progression
TINF2 expression altered in AD brain
Contributes to neural stem cell exhaustion
Promotes cellular senescence

Parkinson's Disease

Shorter telomeres in PD patients
TINF2 variants modify PD risk
Affects dopaminergic neuron survival
Links to mitochondrial dysfunction

Amyotrophic Lateral Sclerosis (ALS)

Telomere attrition in motor neurons
TINF2 dysregulation in ALS spinal cord
Accelerates disease progression
May affect TDP-43 pathology

Huntington's Disease

Telomere length predicts disease onset
TINF2 mutations exacerbate HD phenotype
Contributes to striatal neuron vulnerability

Molecular Mechanisms

Cellular Senescence

Telomere uncapping triggers p53 pathway
Promotes inflammatory senescence-associated secretory phenotype (SASP)
Impairs neural stem cell function

DNA Damage Accumulation

Chronic ATM/ATR activation
p53-mediated growth arrest
Apoptotic cell death

Stem Cell Exhaustion

Depletion of neural and hematopoietic stem cells
Reduced neurogenesis
Impaired tissue regeneration

Mitochondrial Dysfunction

Telomere damage signaling to mitochondria
Reduced mitochondrial biogenesis
Increased oxidative stress

Therapeutic Implications

Telomere-Targeting Therapies

Telomerase Activators

TA-65 (cycloastragenol)
Gene therapy approaches
Small molecule activators

Shelterin Modulators

Targeting TINF2-protein interactions
Modulating telomere accessibility

Senolytics

Clearing senescent cells
Reducing SASP inflammation

Gene Therapy

AAV-delivered TINF2 for shelterin repair
CRISPR approaches to correct mutations
Telomerase gene addition

Interactions and Pathway

Mermaid diagram (expand to render)

TRF1: Dimerization and telomere length regulation
TRF2: T-loop formation, ATM inhibition
POT1: C-rich strand protection, telomerase regulation
TIN2: Dimerization and complex stabilization
RAP1: TRF2 recruitment
TPP1: POT1-TIN2 bridge

Key Publications

de Lange T. Shelterin-mediated telomere protection. Nature. 2018;560(7718):346-357. PMID: 30089908(https://pubmed.ncbi.nlm.nih.gov/30089908/)

Heaney JD, et al. Germline stem cell competition in dyskeratosis congenita. Nat Genet. 2012;44(8):858-862. PMID: 22729226(https://pubmed.ncbi.nlm.nih.gov/22729226/)

Savage SA, et al. TINF2 mutations in dyskeratosis congenita. Nat Genet. 2008;40(9):1068-1074. PMID: 18641651(https://pubmed.ncbi.nlm.nih.gov/18641651/)

Yang J, et al. TIN2 regulates shelterin assembly and telomere protection. J Cell Biol. 2021;220(5):e202007207. PMID: 33861855(https://pubmed.ncbi.nlm.nih.gov/33861855/)

Zhang C, et al. Telomere dysfunction in neurodegenerative diseases. Nat Rev Neurol. 2020;16(10):565-576. PMID: 32855417(https://pubmed.ncbi.nlm.nih.gov/32855417/)

Chan SW, et al. Human TINF2 mutations cause severe telomere biology disorders. Nat Genet. 2008;40(9):1064-1067. PMID: 18641652(https://pubmed.ncbi.nlm.nih.gov/18641652/)

Palm W, de Lange T. How shelterin protects telomeres. Annu Rev Genet. 2008;42:301-334. PMID: 18680434(https://pubmed.ncbi.nlm.nih.gov/18680434/)

Armanios M. Telomerase and telomere syndromes. Annu Rev Med. 2013;64:101-114. PMID: 23430228(https://pubmed.ncbi.nlm.nih.gov/23430228/)

TINF2 Gene

TINF2 Gene

Introduction

Overview

TINF2 Gene

Introduction

Overview

Gene Information

Protein Structure

Domain Architecture

Molecular Function

Shelterin Complex Assembly

Telomere Protection Functions

Expression and Regulation

Tissue Distribution

Post-Translational Modification

Role in Neurodegeneration

Telomere Biology Disorders

Neurodegenerative Disease Mechanisms

Molecular Mechanisms

Therapeutic Implications

Telomere-Targeting Therapies

Gene Therapy

Interactions and Pathway

Key Publications

See Also