ANKRD1 — Ankyrin Repeat Domain 1

ANKRD1 — Ankyrin Repeat Domain 1

<table class="infobox infobox-gene">
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<th class="infobox-header" colspan="2">ANKRD1 — Ankyrin Repeat Domain 1</th>
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<td class="label">Symbol</td>
<td><strong>ANKRD1</strong></td>
</tr>
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<td class="label">Full Name</td>
<td>ANKRD1 — Ankyrin Repeat Domain 1</td>
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<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=ANKRD1" target="_blank">Search NCBI</a></td>
</tr>
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<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
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</table>

ANKRD1 (Ankyrin Repeat Domain 1), also known as CARP (CAncer-related protein) or MCARP (Muscle-specific CARP), is a transcriptional coactivator and scaffold protein containing multiple ankyrin repeat domains. It plays pivotal roles in muscle development, cardiac function, stress responses, and has emerged as an important player in neuronal function and neurodegenerative diseases. ANKRD1 acts as a transcriptional coactivator for p53 and YAP/TAZ, regulating genes involved in cell proliferation, [apoptosis](/entities/apoptosis), differentiation, and stress responses[@zhang2018][@miller2013]. Its expression is dynamically regulated in response to cellular stress, and mounting evidence implicates ANKRD1 in the pathogenesis of Alzheimer's disease (AD), Parkinson's disease (PD), and cerebrovascular injury[@kim2022][@zou2021].

Overview

ANKRD1 — Ankyrin Repeat Domain 1

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">ANKRD1 — Ankyrin Repeat Domain 1</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>ANKRD1</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>ANKRD1 — Ankyrin Repeat Domain 1</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=ANKRD1" target="_blank">Search NCBI</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

ANKRD1 (Ankyrin Repeat Domain 1), also known as CARP (CAncer-related protein) or MCARP (Muscle-specific CARP), is a transcriptional coactivator and scaffold protein containing multiple ankyrin repeat domains. It plays pivotal roles in muscle development, cardiac function, stress responses, and has emerged as an important player in neuronal function and neurodegenerative diseases. ANKRD1 acts as a transcriptional coactivator for p53 and YAP/TAZ, regulating genes involved in cell proliferation, [apoptosis](/entities/apoptosis), differentiation, and stress responses[@zhang2018][@miller2013]. Its expression is dynamically regulated in response to cellular stress, and mounting evidence implicates ANKRD1 in the pathogenesis of Alzheimer's disease (AD), Parkinson's disease (PD), and cerebrovascular injury[@kim2022][@zou2021].

Overview

ANKRD1 is a member of the ankyrin repeat family of proteins, characterized by tandem repeats of the ankyrin motif—a 33-amino acid sequence that mediates protein-protein interactions. The protein is expressed in multiple tissues, with highest expression in cardiac muscle, skeletal muscle, and brain. Its dual function as a transcriptional coactivator and scaffold protein allows it to integrate diverse cellular signals and regulate gene expression programs critical for cellular homeostasis and stress responses.

The discovery of ANKRD1's function as a p53 coactivator linked it to the cellular stress response network. Under conditions of cellular stress, including oxidative stress, DNA damage, and oncogenic stress, ANKRD1 is upregulated and cooperates with p53 to activate genes involved in cell cycle arrest, DNA repair, and apoptosis. This positions ANKRD1 as an important node in the cellular decision between survival and cell death.

In the nervous system, ANKRD1 is expressed in neurons throughout the brain, including cortical neurons, hippocampal neurons, and dopaminergic neurons of the substantia nigra. Its functions in transcriptional regulation, stress response, and protein interactions have direct implications for neurodegeneration. Recent studies have revealed that ANKRD1 is upregulated in AD and PD brains and modulates neuronal survival through p53-dependent and independent mechanisms[@kim2022][@liu2020].

Gene and Protein Structure

Gene Organization

The ANKRD1 gene is located on chromosome 10q23.31 and encodes a protein of 319 amino acids. The gene consists of multiple exons and produces alternatively spliced transcripts with tissue-specific expression patterns. The promoter region contains response elements for various transcription factors, including p53, allowing rapid upregulation in response to cellular stress.

Protein Architecture

ANKRD1 contains several functional domains that mediate its diverse functions:

Ankyrin Repeat Domain:

• Five ankyrin repeats in the central region
• Mediates specific protein-protein interactions
• Binds to various transcription factors and signaling proteins
• Forms the core structural and functional unit

• Two canonical NLS sequences
• Facilitates nuclear import
• Required for transcriptional coactivator function

• Located at the C-terminus
• Mediates transcriptional activation
• Interacts with transcriptional coactivators

• Specifically interacts with p53
• Enhances p53 transcriptional activity
• Modulates p53 target gene expression

• Binds to YAP and TAZ in the Hippo pathway
• Enables cross-talk between stress response and growth control

Function

Transcriptional Regulation

ANKRD1 functions primarily as a transcriptional coactivator:

p53 Coactivation:

• Binds directly to p53 through its DNA-binding domain
• Enhances p53 transcriptional activity
• Promotes expression of p53 target genes involved in cell cycle arrest and apoptosis
• Required for optimal p53-mediated stress response[@zhang2018][@miller2013]

• Cooperates with YAP and TAZ in the Hippo pathway
• Regulates genes involved in cell growth and proliferation
• Links cellular stress to organ size control

• Interacts with other transcription factors beyond p53
• May serve as a coactivator for multiple regulatory proteins
• Context-dependent interactions determine specific functions

Stress Response

ANKRD1 is a key mediator of cellular stress responses:

Oxidative Stress:

• Highly induced by reactive oxygen species (ROS)
• Protects cells from oxidative damage through antioxidant gene activation
• Modulates mitochondrial function and ROS production[@chen2019]

• Upregulated in response to DNA damage
• Enhances p53-dependent DNA damage response
• Promotes cell cycle arrest for DNA repair

• Responds to mechanical stretch in muscle cells
• Involved in cardiac stress response
• May sense mechanical changes in neuronal processes

Cellular Processes

Cell Cycle Regulation:

• Modulates cell cycle progression
• Promotes G1 arrest under stress conditions
• Cooperates with p21 in cell cycle control

• Can promote or inhibit apoptosis depending on context
• Modulates both intrinsic and extrinsic apoptosis pathways
• Important for neuronal survival decisions[@chen2019]

• Involved in autophagy regulation
• May affect protein quality control mechanisms
• Links stress response to cellular clearance pathways[@yang2017]

Neuronal Functions

In neurons, ANKRD1 serves critical functions:

Transcriptional Regulation:

• Acts as coactivator for p53 in neurons
• Modulates stress-induced transcriptional responses
• Regulates genes involved in neuronal survival

• Modulates MAPK/ERK signaling pathways
• Affects neuronal differentiation and plasticity
• Altered in neurodegenerative disease states[@zou2021]

• May interact with neuronal proteins
• Potentially affects synaptic function
• Scaffold function in signaling complexes

Expression Pattern

Tissue Distribution

ANKRD1 exhibits tissue-specific expression:

Muscle:

• Highest expression in cardiac muscle
• Significant expression in skeletal muscle, especially fast-twitch fibers
• Induced during muscle development and regeneration

• Expressed in cortical neurons
• Present in hippocampal neurons
• Detected in dopaminergic neurons of substantia nigra
• Lower expression in astrocytes and oligodendrocytes

• Lower expression in most organs
• Induced in various cell types under stress conditions

Subcellular Localization

• Nuclear: Primary localization in the nucleus
• Cytoplasmic: Cytoplasmic pools in some cell types
• Membrane-associated: Can be associated with membrane fractions
• Mitochondrial: Some association with mitochondria reported

Disease Associations

Cardiovascular Diseases

Dilated Cardiomyopathy (DCM):

• ANKRD1 mutations cause familial DCM
• Loss-of-function mutations lead to heart failure
• Haploinsufficiency as disease mechanism[@wang2020]

• Altered expression in hypertrophic hearts
• Modulates cardiac stress response
• May contribute to disease progression

• Upregulated in failing hearts
• Biomarker potential for cardiac injury[@park2018]
• May represent compensatory response

Muscular Dystrophy

Skeletal Muscle Involvement:

• Altered expression in various muscular dystrophies
• Affects muscle satellite cell function
• Important for muscle regeneration[@shen2020][@nguyen2019]

• Regulates satellite cell proliferation and differentiation
• Modulates muscle repair after injury
• Therapeutic potential for muscle disorders

Neurodegenerative Diseases

Alzheimer's Disease:

• ANKRD1 is upregulated in AD brain tissue
• Modulates p53-mediated neuronal apoptosis
• May influence tau pathology through protein-protein interactions
• Potential therapeutic target[@kim2022][@zhou2019]

• Expressed in dopaminergic neurons of substantia nigra
• Modulates MAPK signaling pathways critical for neuronal survival
• Responds to oxidative stress in neurons
• May interact with alpha-synuclein aggregation pathways
• Protective or detrimental effects depending on context[@liu2020]

• Strongly induced following cerebral ischemia
• Part of the neuronal stress response
• May have protective or detrimental effects depending on context[@liu2018]

Cancer

Oncogenic Role:

• Overexpressed in various cancers
• Promotes tumor progression in some contexts
• May serve as therapeutic target

• Promotes invasion and metastasis in some tumors
• Associated with poor prognosis
• Potential biomarker for cancer progression[@song2018]

Therapeutic Implications

Cardiovascular Therapeutics

Gene Therapy:

• Viral vector delivery of functional ANKRD1
• Restoration of proper expression levels
• Applicable to cardiomyopathy treatment

• Modulators of ANKRD1 expression
• Enhancers of ANKRD1 function
• Potential for heart failure treatment

• Circulating ANKRD1 as heart failure marker
• Prognostic value in cardiovascular disease
• Monitor treatment response

Neurodegenerative Disease Applications

Modulating Neuronal Survival:

• Targeting ANKRD1-p53 interactions
• Modulating MAPK signaling pathways
• Enhancing protective stress responses

• Small molecules targeting ANKRD1 function
• Gene therapy approaches
• Combination therapies

Cancer Therapy

Targeted Approaches:

• Inhibition of ANKRD1 in cancers where it promotes tumor growth
• Combination with other targeted agents
• Biomarker development

Research Methods

Key experimental approaches for studying ANKRD1 include:

• Biochemistry: Protein interaction studies, transcriptional assays
• Cell biology: Live-cell imaging, stress response assays
• Genetics: Knockout mice, CRISPR models
• Neuroscience: Neuronal culture, electrophysiology
• Clinical: Patient samples, genetic analysis

See Also

• [Transcriptional Regulation](/mechanisms/transcriptional-regulation)
• [p53 Pathway](/mechanisms/p53-pathway)
• [MAPK Signaling](/mechanisms/mapk-signaling)
• [Hippo Pathway](/mechanisms/hippo-pathway)
• [Apoptosis](/mechanisms/apoptosis)
• [Stress Response](/mechanisms/stress-response)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Stroke](/diseases/stroke)
• [Dilated Cardiomyopathy](/diseases/dilated-cardiomyopathy)

External Links

• [NCBI Gene: ANKRD1](https://www.ncbi.nlm.nih.gov/gene/27000)
• [UniProt: ANKRD1](https://www.uniprot.org/uniprot/Q15327)
• [Ensembl: ANKRD1](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000148677)
• [GeneCards: ANKRD1](https://www.genecards.org/cgi-bin/carddisp.pl?gene=ANKRD1)
• [OMIM: ANKRD1](https://www.omim.org/entry/607595)

Brain Atlas Resources

• [Allen Human Brain Atlas](https://human.brain-map.org/) — gene expression data
• [BrainSpan Atlas](https://brainspan.org/) — developmental transcriptome
• [Allen Mouse Brain Atlas](https://mouse.brain-map.org/) — mouse brain gene expression

References