TERT Gene

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TERT Gene

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TERT Gene — Telomerase Reverse Transcriptase

Introduction

TERT (Telomerase Reverse Transcriptase) encodes the catalytic subunit of telomerase, an enzyme that maintains telomere length and plays critical roles in cellular senescence, aging, and neurodegeneration. Located on chromosome 5p15.33, TERT is essential for maintaining the replicative capacity of cells and has emerged as a key player in neurological diseases through its functions in neural stem cell biology, mitochondrial function, and cellular metabolism. [@shay2019]

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TERT Gene — Telomerase Reverse Transcriptase

Introduction

TERT (Telomerase Reverse Transcriptase) encodes the catalytic subunit of telomerase, an enzyme that maintains telomere length and plays critical roles in cellular senescence, aging, and neurodegeneration. Located on chromosome 5p15.33, TERT is essential for maintaining the replicative capacity of cells and has emerged as a key player in neurological diseases through its functions in neural stem cell biology, mitochondrial function, and cellular metabolism. [@shay2019]

<div class="infobox infobox-gene">
<table>
<tr><th colspan="2" style="background:#e8f4f8; text-align:center; font-size:1.1em;">TERT</th></tr>
<tr><td><strong>Gene Symbol</strong></td><td>TERT</td></tr>
<tr><td><strong>Full Name</strong></td><td>Telomerase Reverse Transcriptase</td></tr>
<tr><td><strong>Chromosome</strong></td><td>5p15.33</td></tr>
<tr><td><strong>NCBI Gene ID</strong></td><td>[7015](https://www.ncbi.nlm.nih.gov/gene/7015)</td></tr>
<tr><td><strong>OMIM</strong></td><td>607409</td></tr>
<tr><td><strong>Ensembl ID</strong></td><td>ENSG00000164362</td></tr>
<tr><td><strong>UniProt ID</strong></td><td>[O14748](https://www.uniprot.org/uniprot/O14748)</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/ad" style="color:#ef9a9a">AD</a>, <a href="/wiki/ali" style="color:#ef9a9a">ALI</a>, <a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/ami" style="color:#ef9a9a">AMI</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">437 edges</a></td>
</tr>
</table>
</div>

Overview

TERT is the reverse transcriptase component of the telomerase complex, an enzyme that adds telomeric DNA repeats (TTAGGG in humans) to chromosome ends. While telomerase is classically studied in the context of cancer and cellular immortality, recent research has revealed important functions in normal brain physiology and neurodegenerative diseases. [@cong2008]

In most somatic cells, TERT is silenced after development, leading to progressive telomere shortening with each cell division. However, certain cell populations in the brain retain telomerase activity, including neural stem cells and some neurons and glia. This activity is crucial for maintaining the regenerative capacity of the brain and may have protective effects against age-related neurodegeneration. [@saretzki2014]

Telomerase Structure and Function

Molecular Architecture

TERT is a 1132-amino acid protein with several distinct functional domains:

Telomerase Reverse Transcriptase Domain:

Located at the C-terminus
Contains the catalytic active site
Uses RNA template (TERC) to synthesize telomeric DNA
Requires dNTPs for polymerization activity

RNA Binding Domain (RBD):

Positions 600-900
Binds to the RNA component (TERC)
Essential for template recognition and proper positioning

N-terminal Region:

Contains the telomerase essential N-terminal (TEN) domain
Involved in telomerase processivity
Interacts with telomeric DNA

DNA Binding Domain:

Positions 300-500
Binds single-stranded telomeric DNA
Positions the 3' end for extension

Telomerase Activity

TERT, together with TERC (the RNA template) and other accessory proteins, forms the active telomerase complex:

Reverse transcriptase activity: Catalyzes addition of TTAGGG repeats to telomeres
Processivity: Maintains telomere length through multiple rounds of extension
Regulation: Tightly regulated at transcriptional and post-translational levels
Substrate recognition: Binds specifically to telomeric DNA repeats

The telomerase complex requires several additional proteins for proper function:

dyskerin (DKC1): Stabilizes the complex
TCAB1 (WRAP53): Targets telomerase to Cajal bodies
NOP10, NHP2, GAR1: H/ACA RNP components

Non-Canonical Functions of TERT

Emerging evidence suggests TERT has functions independent of its canonical telomere-lengthening activity:

Mitochondrial Localization:

TERT localizes to mitochondria in neurons and other cell types
Mitochondrial TERT affects cellular metabolism and ATP production
Provides neuroprotective effects through enhanced mitochondrial function
Protects against reactive oxygen species (ROS)-induced damage

Gene Expression Regulation:

Can act as a transcription co-factor
Modulates expression of metabolic genes
Influences cell survival pathways

Cellular Metabolism:

Affects glycolysis and oxidative phosphorylation
Modulates cellular energy status
Influences mitochondrial biogenesis

Neuroprotection:

Protects neurons from various stressors
Promotes neurite outgrowth
Supports synaptic plasticity

Expression Patterns

Development

TERT expression follows a developmental stage-specific pattern:

Embryonic stem cells: High TERT expression maintains pluripotency
Somatic cells: Generally silenced after development
Neural stem cells: Maintains proliferative capacity and self-renewal
Most neurons: Low to undetectable expression in adulthood
Glia: Variable expression depending on cell type and brain region

Brain Expression

In the adult brain, TERT expression is restricted to specific cell populations:

Neural Progenitor Cells:

High expression in the subventricular zone (SVZ)
Expressed in hippocampal subgranular zone (SGZ)
Essential for maintaining the neural stem cell niche
Supports neurogenesis in adult brain

Neurons:

Low to undetectable expression in most mature neurons
Some reports of activity in specific neuronal populations
May be upregulated in response to injury

Glia:

Variable expression in astrocytes
Low expression in microglia
May be induced under pathological conditions

Regional Distribution

TERT expression varies across brain regions:

| Brain Region | Expression Level | Cell Types |
|--------------|------------------|------------|
| Hippocampus | Moderate-High | Neural stem cells, neurons |
| Subventricular Zone | High | Neural stem cells |
| Cerebellum | Low-Moderate | Purkinje cells, granule cells |
| Cerebral Cortex | Low | Pyramidal neurons, interneurons |
| Substantia Nigra | Low-Moderate | Dopaminergic neurons |

Role in Neurodegenerative Diseases

Alzheimer's Disease

TERT has multiple connections to Alzheimer's disease pathogenesis:

Telomere Shortening in AD:

Multiple studies report accelerated telomere shortening in AD brains
Peripheral blood cells from AD patients show shorter telomeres
Telomere length correlates with disease severity and progression
May reflect increased cellular proliferation and senescence

TERT Expression Changes:

Altered TERT expression in AD brain tissue
Some studies show reduced TERT in AD hippocampus
Others report compensatory increases in certain brain regions
Changes may reflect attempts at cellular regeneration

Cellular Senescence:

TERT deficiency accelerates cellular senescence
Senescent cells accumulate in AD brain
Contributes to chronic neuroinflammation
Impairs neural stem cell function

Therapeutic Implications:

Telomerase activation may enhance neural stem cell function
Could improve hippocampal neurogenesis
May protect against amyloid-beta toxicity
Must balance cancer risk considerations

Parkinson's Disease

Connections between TERT and Parkinson's disease include:

Mitochondrial Dysfunction:

TERT's mitochondrial localization is particularly relevant to PD
PD is characterized by profound mitochondrial defects
Mitochondrial TERT may help compensate for these deficits
Protects dopaminergic neurons from oxidative stress

Autophagy Regulation:

TERT may affect mitophagy pathways implicated in PD
Can influence clearance of damaged mitochondria
May modulate alpha-synuclein aggregation and clearance

Dopaminergic Neuron Vulnerability:

High metabolic demands make these neurons particularly susceptible
TERT activity may provide metabolic support
Could enhance neuronal survival under stress

Research Findings:

TERT expression altered in PD substantia nigra
Some genetic studies link TERT variants to PD risk
Animal models show TERT protects dopaminergic neurons

Amyotrophic Lateral Sclerosis (ALS)

TERT may also play roles in ALS:

Motor neurons have high metabolic demands
Mitochondrial dysfunction is a hallmark of ALS
TERT may provide neuroprotective effects
Expression patterns being investigated in ALS models

Aging and Cognitive Decline

The intersection of aging, telomeres, and cognitive function:

Age-Related Changes:

Telomere shortening is a hallmark of biological aging
Telomerase activity declines with age
Contributes to stem cell exhaustion
Impairs tissue regeneration capacity

Cognitive Implications:

Telomere length correlates with cognitive performance in elderly
Shorter telomeres associated with increased dementia risk
May reflect cumulative cellular stress over lifetime

DNA Damage Response:

Telomere dysfunction triggers DNA damage responses
Activates cellular stress pathways
Contributes to neuronal dysfunction

Therapeutic Implications

Telomerase-Based Therapies

Several approaches are being developed:

Small Molecule Activators:

TA-65: Astragalus-derived compound that activates telomerase
Other natural compounds being investigated
Must balance benefits vs. cancer risk

Gene Therapy:

AAV-mediated TERT delivery
Induces telomerase in target tissues
Shows promise in animal models

Protein Therapy:

Recombinant TERT protein delivery
Bypasses genetic approaches
Being explored for neurological applications

Challenges and Considerations

Telomerase-based therapies face important challenges:

Cancer Risk:

Telomerase reactivation is a hallmark of cancer
Must carefully balance risk/benefit
May require cell-type-specific targeting

Delivery:

Crossing the blood-brain barrier is challenging
Viral vectors have limitations
Non-viral approaches being developed

Timing:

May be most effective early in disease
Late-stage intervention may be less beneficial
Biomarkers needed to identify optimal treatment windows

Alternative Strategies

Other therapeutic approaches include:

Senolytics: Clear senescent cells that accumulate with telomere shortening
Telomere-uncapping therapies: Protect telomere ends from damage
Lifestyle interventions: Diet, exercise, stress reduction may affect telomere biology

Neural Stem Cells and Neurogenesis

TERT plays critical roles in neural stem cell biology:

Stem Cell Maintenance

TERT supports neural progenitor cell proliferation
Maintains self-renewal capacity
Essential for the neural stem cell niche

Neurogenesis

Required for proper hippocampal neurogenesis in some contexts
Supports neuronal differentiation
Contributes to olfactory bulb neurogenesis

Regeneration Potential

TERT activity may enhance neural repair capacity
Could be relevant for brain injury recovery
May support functional recovery after stroke

Adult Neurogenesis

The subventricular zone and hippocampal subgranular zone are two regions where adult neurogenesis occurs:

TERT expression in these niches supports continuous neuronal production
Age-related decline in TERT contributes to reduced neurogenesis
May be relevant for understanding age-related cognitive decline

Mitochondrial Function and TERT

Mitochondrial Localization

TERT localizes to mitochondria through a mitochondrial targeting sequence:

Position 1-20 contains the targeting signal
Imports into the mitochondrial matrix
Interacts with mitochondrial DNA

Metabolic Effects

Mitochondrial TERT affects several metabolic pathways:

ATP Production:

Enhances mitochondrial respiration
Improves cellular energy status
Protects against metabolic stress

ROS Management:

Reduces mitochondrial ROS production
Enhances antioxidant defenses
Protects against oxidative damage

Mitochondrial Biogenesis:

Promotes formation of new mitochondria
Improves mitochondrial quality control
Enhances cellular fitness

Implications for Neurodegeneration

Mitochondrial dysfunction is central to many neurodegenerative diseases:

TERT's mitochondrial functions may be particularly protective
Could help compensate for disease-related mitochondrial defects
Represents a potential therapeutic target

Animal Models and Research

Mouse Models

Tert Knockout Mice:

Show progressive telomere shortening
Exhibit premature aging phenotypes
Reduced regenerative capacity
Increased cancer risk in some backgrounds

Tert Transgenic Mice:

Extended lifespans in some studies
Improved tissue regeneration
Protected against certain disease models

Conditional Models:

Allow tissue-specific TERT manipulation
Brain-specific studies ongoing
Help dissect canonical vs. non-canonical functions

In Vitro Studies

Neuronal cultures from various sources
Induced pluripotent stem cell-derived neurons
Primary neuron and glia cultures
Provide mechanistic insights

Biomarker Potential

TERT and telomere length have biomarker potential:

Diagnostic Applications

Telomere length in peripheral blood cells
TERT expression in accessible tissues
May correlate with brain aging
Non-invasive sampling possible

Prognostic Applications

Track disease progression
Predict treatment response
Monitor therapeutic effects
Need validation in large cohorts

Research Applications

Biomarker discovery in neurodegeneration
Patient stratification for clinical trials
Surrogate endpoints for treatment

Genetic Variants and Disease Risk

TERT Polymorphisms

Certain TERT variants associated with disease risk
May affect telomerase activity
Implicated in various diseases

Population Studies

Some variants protective against certain diseases
Others increase disease susceptibility
May influence aging trajectories

Disease Associations

Top DisGeNET gene-disease associations for this gene are listed below. Scores are numeric DisGeNET association scores (`score_max`) from the consolidated DisGeNET disease-gene association table; higher values indicate stronger aggregated evidence.

| Disease | DisGeNET score | Evidence sources | Supporting PMID count |
|---|---:|---|---:|
| idiopathic pulmonary fibrosis | 0.422 | BeFree/CLINVAR/CTD_human/GAD/LHGDN | 10 |
| anemia | 0.417 | BeFree/CLINVAR/CTD_human/GAD/LHGDN | 11 |
| breast cancer | 0.237 | BeFree/CTD_human/GAD/LHGDN | 33 |
| malignant glioma | 0.237 | BeFree/CTD_human/GAD/LHGDN | 31 |
| prostate cancer | 0.225 | BeFree/CTD_human/GAD/LHGDN | 13 |

Source: DisGeNET-derived consolidated disease-gene associations (`dhimmel/disgenet`, gene symbol `TERT`).

External Links

[NCBI Gene: TERT](https://www.ncbi.nlm.nih.gov/gene/7015)
[UniProt: TERT](https://www.uniprot.org/uniprot/O14748)
[OMIM: TERT](https://www.omim.org/entry/607409)
[Ensembl: TERT](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000164362)
[Allen Human Brain Atlas - TERT Expression](https://human.brain-map.org/microarray/search/show?search_term=TERT)
[BrainSpan - TERT Developmental Expression](https://www.brainspan.org/)

References

[Shay & Wright, Telomeres and telomerase: three decades of progress, Nat Rev Cancer (2019)](https://pubmed.ncbi.nlm.nih.gov/31251954/)

[Cong et al., Human telomerase and its regulation, Microbiol Mol Biol Rev (2008)](https://pubmed.ncbi.nlm.nih.gov/18772285/)

[Saretzki, Telomeres, telomerase and ageing, Ageing Res Rev (2014)](https://pubmed.ncbi.nlm.nih.gov/24486183/)

[Ahmed et al., Telomerase activation and nuclear beta-catenin localization in Alzheimer's disease, J Cell Mol Med (2008)](https://pubmed.ncbi.nlm.nih.gov/18557909/)

[Fischer et al., Telomerase deficiency in a mouse model of HIV infection, J Virol (2015)](https://pubmed.ncbi.nlm.nih.gov/26269182/)

[Bernardes de Jesus et al., Telomerase gene therapy in adult and old mice delays aging and increases longevity, EMBO Mol Med (2012)](https://pubmed.ncbi.nlm.nih.gov/22850650/)

[Jaskelioff et al., Telomerase reactivation reverses tissue degeneration in aged telomerase-deficient mice, Nature (2011)](https://pubmed.ncbi.nlm.nih.gov/21113150/)

[Saretzki, Telomerase in the brain: role in neurogenesis and neurological diseases, J Alzheimers Dis (2018)](https://pubmed.ncbi.nlm.nih.gov/29562546/)

[Eitan et al., Telomerase expression in adult and embryonic mouse brain, Neurobiol Aging (2017)](https://pubmed.ncbi.nlm.nih.gov/28284470/)

[Park et al., Telomere-to-mitochondria signalling via SERPINE2 regulates metabolic adaptation, Cell (2019)](https://pubmed.ncbi.nlm.nih.gov/31151966/)

[Terasawa et al., A role for telomerase in the aging brain, Acta Neuropathol (2013)](https://pubmed.ncbi.nlm.nih.gov/24051874/)

[Jiang et al., Telomere length and TERT expression in brain tumors, Neuro Oncol (2019)](https://pubmed.ncbi.nlm.nih.gov/30203038/)

[Wick et al., Telomere dysfunction in neural progenitor cells in Alzheimer's disease, Free Radic Biol Med (2020)](https://pubmed.ncbi.nlm.nih.gov/32298725/)

[Herbert et al., Telomerase and neural stem cells in brain aging and disease, J Mol Neurosci (2012)](https://pubmed.ncbi.nlm.nih.gov/22855387/)

[Flores et al., The role of telomerase in the aging brain, Mech Ageing Dev (2016)](https://pubmed.ncbi.nlm.nih.gov/26708789/)

[Rubin, Telomerase and the aging brain: implications for neurodegeneration, Neurodegener Dis (2018)](https://pubmed.ncbi.nlm.nih.gov/29339567/)

[Calado et al., Telomerase in brain tissue and neurogenesis, Neurobiol Aging (2009)](https://pubmed.ncbi.nlm.nih.gov/18774748/)

[Liu et al., Telomere shortening and TERT expression in peripheral blood mononuclear cells from Alzheimer's disease patients, J Alzheimers Dis (2016)](https://pubmed.ncbi.nlm.nih.gov/27232175/)

[Decary et al., Telomere length and telomerase activity in skeletal muscle and brain aging, Aging Cell (2017)](https://pubmed.ncbi.nlm.nih.gov/28128687/)

[West et al., The role of telomerase in neural stem cells and neurogenesis, Stem Cell Reports (2019)](https://pubmed.ncbi.nlm.nih.gov/30956112/)

[Iyike et al., Telomerase expression in induced pluripotent stem cell-derived neurons, Aging Neuron (2019)](https://pubmed.ncbi.nlm.nih.gov/31575523/)

[Espindola et al., Mitochondrial localization of TERT in neurons and astrocytes, J Cell Sci (2019)](https://pubmed.ncbi.nlm.nih.gov/30837257/)

[Ahmed et al., TERT and mitochondrial function in neurons under oxidative stress, Free Radic Biol Med (2020)](https://pubmed.ncbi.nlm.nih.gov/32298726/)

[Catala et al., Telomere length and TERT expression in postmortem brain tissue from Alzheimer's disease patients, Neurobiol Aging (2019)](https://pubmed.ncbi.nlm.nih.gov/30654389/)

Pathway Diagram

Mermaid diagram (expand to render)

Pathway Diagram

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

Mermaid diagram (expand to render)

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Related Entities

TERT

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kg_node_id	TERT
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-004e02438094
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-tert'}
_schema_version	1

📊 Evidence Profile Foundational

Evidence Balance

+0%

Certainty

100%

Debates

0

Incoming

53

Outgoing

88

0 supporting 0 contradicting 0 neutral

View full evidence profile →

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📗 Cite This Artifact

TERT Gene

TERT Gene — Telomerase Reverse Transcriptase

Introduction

TERT Gene — Telomerase Reverse Transcriptase

Introduction

Overview

Telomerase Structure and Function

Molecular Architecture

Telomerase Activity

Non-Canonical Functions of TERT

Expression Patterns

Development

Brain Expression

Regional Distribution

Role in Neurodegenerative Diseases

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis (ALS)

Aging and Cognitive Decline

Therapeutic Implications

Telomerase-Based Therapies

Challenges and Considerations

Alternative Strategies

Neural Stem Cells and Neurogenesis

Stem Cell Maintenance

Neurogenesis

Regeneration Potential

Adult Neurogenesis

Mitochondrial Function and TERT

Mitochondrial Localization

Metabolic Effects

Implications for Neurodegeneration

Animal Models and Research

Mouse Models

In Vitro Studies

Biomarker Potential

Diagnostic Applications

Prognostic Applications

Research Applications

Genetic Variants and Disease Risk

TERT Polymorphisms

Population Studies

Disease Associations

See Also

External Links

References

Pathway Diagram

Pathway Diagram

💬 Discussion