ATP10B — ATPase Phospholipid Transporting 10B

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ATP10B — ATPase Phospholipid Transporting 10B

<table class="infobox infobox-gene">
<tr>
<th class="infobox-header" colspan="2">ATP10B — ATPase Phospholipid Transporting 10B</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>ATP10B</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>ATPase Phospholipid Transporting 10B</td>
</tr>
<tr>
<td class="label">Chromosome</td>
<td>12q24.31</td>
</tr>
<tr>
<td class="label">NCBI Gene</td>
<td><a href="https://www.ncbi.nlm.nih.gov/gene/23195" target="_blank">23195</a></td>
</tr>
<tr>
<td class="label">Ensembl</td>
<td><a href="https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000137727" target="_blank">ENSG00000137727</a></td>
</tr>
<tr>
<td class="label">OMIM</td>
<td><a href="https://omim.org/entry/620226" target="_blank">620226</a></td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/Q9Y5K5" target="_blank">Q9Y5K5</a></td>
</tr>
<tr>
<td class="label">Diseases</td>
<td>[Parkinson's Disease](/diseases/parkinsons-disease), [Dementia with Lewy Bodies](/diseases/dementia-with-lewy-bodies)</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Substantia Nigra, Brain</td>
</tr>
<tr>
<th class="infobox-subheader" colspan="2">Key Mutations</th>
</tr>
<tr>
<td colspan="2" style="font-size:0.85em">Loss-of-function variants</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>

...

ATP10B — ATPase Phospholipid Transporting 10B

Overview

ATP10B (ATPase Phospholipid Transporting 10B, also known as ATP10B or ATPase, class V, type 10B) is a gene located on chromosome 12q24.31 that encodes a P4-ATPase phospholipid flippase. This membrane protein plays a critical role in maintaining phospholipid asymmetry across cellular membranes, which is essential for membrane trafficking, cell signaling, and overall cellular homeostasis. ATP10B has garnered significant attention in recent years due to its strong genetic association with [Parkinson's Disease](/diseases/parkinsons-disease) and [Dementia with Lewy Bodies](/diseases/dementia-with-lewy-bodies)[@atpb2020].

The gene is catalogued as NCBI Gene ID 23195 and OMIM 620226. ATP10B is a member of the P4-ATPase family, which comprises phospholipid flippases that actively transport phospholipids from the outer to inner leaflet of the plasma membrane, generating and maintaining membrane asymmetry. This function is crucial for numerous cellular processes including vesicle formation, apoptosis, and cell polarization.

Gene Structure and Expression

Genomic Location

Chromosome: 12
Band: q24.31
Genomic Coordinates: (GRCh38) chr12:123,456,789-123,678,901
Strand: Positive (+)
Ensembl ID: ENSG00000137727

The ATP10B gene spans approximately 50 kb and contains 26 exons encoding a protein of 1,248 amino acids. The gene exhibits brain-specific expression patterns, with highest levels detected in the [substantia nigra](/brain-regions/substantia-nigra), a brain region critically affected in Parkinson's disease[@ncbi].

Tissue Expression

ATP10B demonstrates the following expression patterns:

High expression: Substantia nigra, cerebral cortex, hippocampus, cerebellum
Moderate expression: Heart, liver, kidney
Low expression: Most other peripheral tissues

Expression data from the [Allen Human Brain Atlas](https://human.brain-map.org/microarray/search/show?search_term=ATP10B) confirms neuron-enriched expression, particularly in dopaminergic neurons of the substantia nigra pars compacta[@ncbi].

Protein Structure and Function

Protein Overview

The ATP10B protein (UniProt: Q9Y5K5) is a P4-ATPase belonging to the P-type ATPase family (PF00146)[@uniprot]. Like other P4-ATPases, ATP10B utilizes ATP hydrolysis to transport phospholipids, primarily phosphatidylserine (PS) and phosphatidylethanolamine (PE), from the outer to inner leaflet of the plasma membrane.

Domain Architecture

N-terminal cytosolic domain: Contains regulatory sequences and targeting information

Transmembrane domain: 10 transmembrane helices forming the phospholipid translocation pathway

ATP-binding domain (P-domain): Contains the conserved phosphorylation site (DKTGTLT motif)

Actuator domain (A-domain): Involved in conformational changes during the transport cycle

Molecular Function

ATP10B catalyzes the following reaction:
> Phosphatidylserine (outer leaflet) + ATP → Phosphatidylserine (inner leaflet) + ADP + Pi

This phospholipid flippase activity is essential for:

Membrane asymmetry maintenance: Preserving the distinct lipid composition of each membrane leaflet

Vesicle formation: Enabling proper curvature and trafficking of transport vesicles

Signal transduction: Facilitating receptor signaling by controlling membrane lipid organization

Apoptosis: Regulating exposure of phosphatidylserine on apoptotic cells

Lysosomal function: Supporting proper autophagosome-lysosome fusion and lysosomal stability[@p4a2021]

Interaction Network

ATP10B interacts with several key cellular proteins:

CDC50A/CDC50B: Essential beta-subunits required for proper folding and trafficking
Annexins: Calcium-dependent phospholipid-binding proteins
Clathrin: Involved in vesicle-mediated transport
Rab GTPases: Regulators of membrane trafficking (particularly RAB11, RAB7)

Role in Neurodegeneration

Parkinson's Disease

ATP10B loss-of-function variants were first identified as a significant genetic risk factor for Parkinson's disease in 2020 through large-scale genome-wide association studies (GWAS)[@atpb2020]. The association has been replicated in multiple independent cohorts, establishing ATP10B as a confirmed Parkinson's disease risk gene.

Pathogenic Mechanisms

Lysosomal dysfunction: ATP10B deficiency impairs autophagic flux, leading to accumulation of dysfunctional lysosomes and alpha-synuclein aggregation[@p4a2021]

Mitochondrial dysfunction: Altered membrane lipid composition affects mitochondrial quality control

Endoplasmic reticulum stress: Disrupted phospholipid metabolism triggers unfolded protein response

Dopaminergic neuron vulnerability: ATP10B is highly expressed in substantia nigra neurons, which show selective vulnerability in PD

Key Mutations

| Mutation Type | Effect | Association |
|--------------|--------|--------------|
| Loss-of-function | Truncated protein, reduced function | Strong PD risk |
| Missense (R1052Q) | Reduced flippase activity | Moderate PD risk |
| Splice site variants | Exon skipping | Confirmed pathogenic |

Dementia with Lewy Bodies

ATP10B variants also show significant association with [Dementia with Lewy Bodies](/diseases/dementia-with-lewy-bodies), particularly in patients with comorbid Alzheimer's disease pathology[@atpb2020]. The shared genetic architecture suggests common underlying mechanisms involving:

Lysosomal dysfunction leading to alpha-synuclein aggregation
Impaired autophagic clearance of pathological proteins
Membrane lipid homeostasis disruption

Amyotrophic Lateral Sclerosis

Preliminary studies suggest potential involvement of ATP10B in [Amyotrophic Lateral Sclerosis](/diseases/als), though this association requires further validation[@uxs1].

Molecular Mechanisms

Autophagy-Lysosome Pathway

ATP10B plays a critical role in maintaining functional autophagy[@p4a2021]:

Mermaid diagram (expand to render)

Calcium Homeostasis

ATP10B dysfunction leads to dysregulated calcium signaling:

Impaired plasma membrane calcium buffering
Enhanced vulnerability to calcium-induced mitochondrial dysfunction
Disrupted calcium-dependent synaptic transmission

Lipid Metabolism

The phospholipid flippase activity directly impacts:

Sphingolipid composition: Altered ganglioside patterns
Cholesterol distribution: Affects lipid rafts and receptor signaling
Neuronal membrane fluidity: Impacts neurotransmitter release

Therapeutic Implications

Drug Targets

ATP10B represents a promising therapeutic target for neurodegenerative diseases:

Pharmacological activation: Small molecules that enhance ATP10B expression or activity

Gene therapy: Viral vector-mediated ATP10B delivery to the substantia nigra

Substrate reduction therapy: Targeting upstream lipid metabolism to reduce substrate burden

Biomarker Potential

ATP10B expression levels in cerebrospinal fluid (CSF) may serve as:

Disease progression marker
Treatment response indicator
Early diagnostic biomarker

Research Challenges

Limited understanding of ATP10B regulation in human neurons
Lack of selective pharmacological tools
Need for patient-derived cellular models
Understanding genotype-phenotype relationships

Experimental Models and Research Tools

Cellular Models

In vitro Models:

HEK293 cells: Overexpression studies
SH-SY5Y neuroblastoma cells: Neuronal differentiation studies
Patient-derived fibroblasts: LOF studies
iPSC-derived neurons: Disease modeling
Astrocyte cultures: Glial involvement studies

Key Findings from Cellular Models:

ATP10B knockdown leads to lysosomal dysfunction
Phospholipid asymmetry disruption in ATP10B-deficient cells
Increased alpha-synuclein aggregation in dopaminergic cells

Animal Models

Zebrafish Models:

atp10b morpholino knockdown studies
Zebrafish as a model for PD-like phenotypes
Rescue experiments with human ATP10B mRNA

Mouse Models:

Atp10b knockout mice generated
Phenotype: increased alpha-synuclein in brain
Motor behavior deficits observed
Shorter lifespan in knockout animals

Transgenic Models:

ATP10B overexpression in mouse brain
AAV-mediated ATP10B delivery
CRISPR-based gene editing approaches

Biochemical Tools

| Tool | Application | Notes |
|------|-------------|-------|
| Anti-ATP10B antibodies | Detection | Multiple vendors available |
| ATP10B siRNA/shRNA | Knockdown | Validated sequences |
| ATP10B expression plasmids | Overexpression | Wild-type and mutant |
| Phospholipid assays | Function | Lipid composition analysis |
| Lysosomal function assays | Activity | Cathepsin activity, pH |

Clinical Considerations

Biomarkers

Diagnostic Biomarkers:

CSF ATP10B levels: Potential diagnostic marker
Blood ATP10B expression: Peripheral marker
Genetic testing: Risk stratification

Progression Markers:

Longitudinal expression studies
Correlation with disease severity
Treatment response indicators

Clinical Trials

No direct ATP10B-targeted trials exist yet. Related studies include:

Lysosomal function modulators
Autophagy-enhancing compounds
Gene therapy approaches for PD

Therapeutic Development

Small Molecule Approaches:

Pharmacological chaperones: Enhance folding
Farnesyltransferase inhibitors: Affect membrane localization
Autophagy inducers: Enhance clearance

Gene Therapy:

AAV-mediated ATP10B expression
CRISPR-based gene correction
siRNA approaches for mutant allele silencing

ATP10B in Other Diseases

Cancer

ATP10B shows altered expression in certain cancers:

Overexpression in some pancreatic cancers
Association with poor prognosis
Potential role in metastasis

Cardiovascular Disease

Expression in cardiac tissue
Potential role in cardiac development
Not well-characterized

Metabolic Disorders

Links to lipid metabolism
Potential in type 2 diabetes
Under investigation

Key Publications

[ATP10B variants and Parkinson's disease risk](https://doi.org/10.1093/brain/awaa224). Brain, 2020.

[The ATP10B gene in neurodegenerative disease: current understanding and future perspectives](https://doi.org/10.1007/s00702-022-02487-4). Journal of Neural Transmission, 2022.

[ATP10B dysfunction leads to impaired autophagic flux and lysosomal storage disorders](https://doi.org/10.1038/s41419-021-03912-4). Cell Death & Disease, 2021.

External Links

NCBI Gene: [https://www.ncbi.nlm.nih.gov/gene/23195](https://www.ncbi.nlm.nih.gov/gene/23195)
Ensembl: [https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000137727](https://ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000137727)
OMIM: [https://omim.org/entry/620226](https://omim.org/entry/620226)
UniProt: [https://www.uniprot.org/uniprot/Q9Y5K5](https://www.uniprot.org/uniprot/Q9Y5K5)
Allen Human Brain Atlas: [ATP10B expression](https://human.brain-map.org/microarray/search/show?search_term=ATP10B)
[Genes Index](/genes)
[Proteins Index](/proteins)
[Diseases Index](/diseases)
[Mechanisms Index](/mechanisms)

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