PIEZO2 — Piezo Type Mechanosensitive Ion Channel Component 2

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PIEZO2 — Piezo Type Mechanosensitive Ion Channel Component 2

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PIEZO2 — Piezo Type Mechanosensitive Ion Channel Component 2

Pathway Diagram

flowchart TD PIEZO2["PIEZO2"] MA_CHANNELS["MA Cation Channels"] DRG["DRG Neurons"] MECH_SENS["Mechanosensation"] PAIN["Pain Signaling"] TOUCH["Touch Sensation"] PROPRIO["Proprioception"] PIEZO1["PIEZO1"] CALCIUM["Calcium Influx"] INFLAMMATION["Inflammation"] SENESCENCE["Senescence"] APOPTOSIS["Apoptosis"] NEURO_DAMAGE["Neuronal Damage"] NEURODEGENERATION["Neurodegeneration"] PIEZO2 -->|"participates in"| MA_CHANNELS PIEZO2 -->|"expressed in"| DRG MA_CHANNELS -->|"mediates"| MECH_SENS MA_CHANNELS -->|"triggers"| CALCIUM MECH_SENS -->|"enables"| PAIN MECH_SENS -->|"enables"| TOUCH MECH_SENS -->|"enables"| PROPRIO PIEZO2 -->|"activates"| PIEZO1 CALCIUM -->|"promotes"| INFLAMMATION CALCIUM -->|"induces"| SENESCENCE INFLAMMATION -->|"triggers"| APOPTOSIS SENESCENCE -->|"leads to"| NEURO_DAMAGE APOPTOSIS -->|"causes"| NEURO_DAMAGE NEURO_DAMAGE -->|"results in"| NEURODEGENERATION classDef central fill:#006494,color:#e0e0e0 classDef protective fill:#1b5e20,color:#e0e0e0 classDef pathological fill:#ef5350,color:#0d0d1a classDef regulatory fill:#4a1a6b,color:#e0e0e0 classDef outcome fill:#5d4400,color:#e0e0e0 class PIEZO2,MA_CHANNELS central class PAIN,TOUCH,PROPRIO protective class INFLAMMATION,SENESCENCE,APOPTOSIS,NEURO_DAMAGE pathological class MECH_SENS,CALCIUM,PIEZO1 regulatory class NEURODEGENERATION outcome

...

PIEZO2 — Piezo Type Mechanosensitive Ion Channel Component 2

Pathway Diagram

Mermaid diagram (expand to render)

<table class="infobox infobox-gene">
<tr><th class="infobox-header" colspan="2">PIEZO2</th></tr>
<tr><td class="label">Full Name</td><td>Piezo Type Mechanosensitive Ion Channel Component 2</td></tr>
<tr><td class="label">Chromosome</td><td>18p11.22</td></tr>
<tr><td class="label">NCBI Gene ID</td><td><a href="https://www.ncbi.nlm.nih.gov/gene/63895" target="_blank">63895</a></td></tr>
<tr><td class="label">Ensembl ID</td><td>ENSG00000154864</td></tr>
<tr><td class="label">OMIM ID</td><td>613629</td></tr>
<tr><td class="label">UniProt ID</td><td><a href="https://www.uniprot.org/uniprot/Q9H5I5" target="_blank">Q9H5I5</a></td></tr>
<tr><td class="label">Associated Diseases</td><td>Distal Arthrogryposis Type 5, Gordon Syndrome, Marden-Walker Syndrome, Hereditary Sensory Neuropathy</td></tr>
</table>

PIEZO2 — Piezo Type Mechanosensitive Ion Channel Component 2

Overview

PIEZO2 encodes the principal mechanosensitive ion channel responsible for light touch sensation and proprioception in the mammalian nervous system. PIEZO2 is a remarkably large trimeric transmembrane protein that directly converts mechanical force into electrical signals, functioning as the molecular basis of gentle touch, vibration detection, and body position sense. The discovery of PIEZO channels by Ardem Bhattacharyya (Patapoutian) and colleagues earned the 2021 Nobel Prize in Physiology or Medicine[@coste2010].

PIEZO2 is relevant to neurodegeneration because its dysfunction causes inherited sensory and motor neuropathies, and because mechanosensitive signaling pathways influence neuroinflammation, neuronal survival, and glial activation. Gain-of-function mutations cause distal arthrogryposis syndromes, while loss-of-function mutations cause a distinctive syndrome of absent proprioception and touch insensitivity. PIEZO2's expression in [dorsal root ganglia](/brain-regions/dorsal-root-ganglia) sensory neurons, [Merkel cells](/cell-types/merkel-cells), and proprioceptors positions it at the interface between sensory processing and neurodegeneration[@ranade2014].

Gene Structure and Expression

PIEZO2 is located on chromosome 18p11.22 and spans approximately 430 kb, one of the largest genes in the genome. It encodes a 2822-amino acid protein that forms functional homotrimeric channels. Each subunit contains:

Extracellular blade domains (N-terminal region): 38 transmembrane helices arranged as peripheral "propeller blades" that sense membrane tension and curvature
Anchor domain: Links the mechanosensing blades to the pore module
Central pore module: Three inner helices from each subunit form a cation-selective ion channel pore
C-terminal extracellular domain (CED): Contains the selectivity filter and is accessible for pharmacological modulation
Beam and latch: Intracellular lever-like structures that transmit force from the blades to the pore gate

PIEZO2 is expressed in a highly cell-type-specific pattern in the nervous system:

Dorsal root ganglion (DRG) neurons: Large-diameter Aβ mechanoreceptors for light touch and proprioception
Trigeminal ganglion neurons: Facial and oral mechanoreception
Merkel cells: Epidermal mechanoreceptors (Merkel cell-neurite complexes)
Proprioceptors: Muscle spindle afferents and Golgi tendon organs
Enteric neurons: Gut mechanosensation
Brain: Low-level expression in [hippocampus](/brain-regions/hippocampus) and [cortex](/brain-regions/cerebral-cortex)[@wu2017]

Function

Mechanotransduction

PIEZO2 is the primary mechanotransducer for discriminative touch and proprioception:

Light touch: Converts gentle skin deformation into electrical signals via rapidly adapting mechanically-gated currents
Vibration detection: Detects high-frequency vibration (particularly 40-250 Hz Pacinian-range stimuli) through rapid inactivation kinetics
Proprioception: In muscle spindle afferents, PIEZO2 senses muscle stretch, providing the brain with continuous information about limb position and movement
Airway stretch sensing: PIEZO2 in pulmonary sensory neurons mediates the Hering-Breuer inflation reflex

Channel Biophysics

PIEZO2 has distinctive biophysical properties:

Rapid inactivation: Mechanically activated currents inactivate within milliseconds, enabling detection of dynamic stimuli
Cation selectivity: Permeant to Na+, K+, and Ca2+ with moderate calcium permeability (PCa/PNa ~4.5)
Force sensitivity: Activated by membrane tension, osmotic swelling, and direct pipette poking
Modulation: Channel kinetics are modulated by STOML3 (stomatin-like protein 3), which enhances mechanosensitivity

Neurodevelopmental Functions

PIEZO2 plays essential roles in nervous system development:

Axon guidance: Mechanosensitive signaling through PIEZO2 influences growth cone navigation
Neuronal migration: PIEZO2-mediated calcium transients guide neuronal positioning during cortical development
Circuit refinement: Activity-dependent PIEZO2 signaling contributes to somatosensory circuit maturation[@koser2016]

Disease Associations

Distal Arthrogryposis Type 5 (DA5)

Gain-of-function PIEZO2 mutations cause distal arthrogryposis type 5:

Joint contractures: Fixed flexion deformities of distal joints (fingers, toes)
Limited eye movement: Restrictive ophthalmoplegia
Mechanism: Gain-of-function mutations slow channel inactivation, leading to excessive mechanotransduction and sustained muscle contraction during development
I802F, R2686H mutations: Slow inactivation kinetics 3-10 fold[@coste2013]

Gordon Syndrome

Another gain-of-function PIEZO2 disorder:

Distal arthrogryposis: Similar to DA5 with joint contractures
Cleft palate: Orofacial involvement
Short stature: Growth restriction
Ptosis: Eyelid drooping

PIEZO2 Deficiency Syndrome (Loss-of-Function)

Biallelic loss-of-function PIEZO2 mutations cause a distinctive neurological syndrome:

Absent proprioception: Complete loss of body position sense, leading to sensory ataxia — patients cannot stand with eyes closed (positive Romberg sign) and have severely impaired joint position sense
Loss of light touch: Inability to detect gentle skin contact, with preserved pain and temperature sensation
Absent vibration sense: Complete loss of vibratory perception
Normal pain: Nociceptive pathways (mediated by [TRPV1](/genes/trpv1) and other channels) remain intact
Hip dysplasia: Developmental skeletal abnormalities
Progressive scoliosis: Spinal deformity from proprioceptive denervation
Motor coordination: Remarkably, patients develop compensatory strategies using vision and vestibular input[@chesler2016]

Relevance to Neurodegeneration

PIEZO2 intersects with neurodegeneration through several mechanisms:

Sensory neuronopathy: PIEZO2-expressing large-diameter DRG neurons are preferentially lost in certain sensory neurodegenerative conditions, and PIEZO2 dysfunction may contribute to proprioceptive decline in aging
Microglial mechanosensing: [Microglia](/cell-types/microglia-neuroinflammation) express mechanosensitive channels and respond to tissue stiffness changes. While [PIEZO1](/genes/piezo1) is the dominant microglial mechanosensor, PIEZO2 may contribute to mechanosensitive inflammatory signaling in the brain
[Amyloid-beta](/proteins/amyloid-beta) and tissue stiffness: Amyloid plaque deposition alters brain tissue mechanics. Mechanosensitive signaling through Piezo channels may transduce these mechanical changes into cellular responses
Peripheral neuropathy in AD/PD: Proprioceptive deficits and gait instability in [Alzheimer's disease](/diseases/alzheimers-disease) and [Parkinson's disease](/diseases/parkinsons-disease) may partly reflect PIEZO2-expressing neuron dysfunction in DRG[@nonomura2017]
Age-dependent decline: Touch sensitivity and proprioception decline with aging, potentially reflecting age-related changes in PIEZO2 expression or function

Therapeutic Implications

Pharmacological Modulation

Yoda1: Selective [PIEZO1](/genes/piezo1) agonist (does not activate PIEZO2), used as research tool
Jedi1/Jedi2: Non-selective Piezo channel activators
GsMTx4: Spider venom peptide that inhibits mechanosensitive channels including PIEZO2
Ruthenium red: Non-selective blocker of mechanosensitive channels
Gain-of-function therapeutic targeting: For DA5/Gordon syndrome, PIEZO2 inhibitors could potentially reduce excessive mechanotransduction

Gene Therapy

PIEZO2 deficiency: Gene replacement therapy for PIEZO2 loss-of-function is challenging due to the enormous gene size (~8.5 kb cDNA)
ASO approaches: Antisense oligonucleotides to modulate PIEZO2 splicing in gain-of-function disorders

Rehabilitation Relevance

Understanding PIEZO2 biology informs rehabilitation strategies for proprioceptive loss in neurodegenerative diseases
Vibration therapy and proprioceptive training paradigms target PIEZO2-mediated pathways[@szczot2018]

Key Research Findings

Coste et al. (2010) discovered PIEZO1 and PIEZO2 as mechanically activated ion channels[@coste2010]
Ranade et al. (2014) demonstrated PIEZO2 as the principal mechanotransducer for light touch sensation[@ranade2014]
Woo et al. (2015) identified PIEZO2 as essential for proprioception in mice[@woo2014]
Chesler et al. (2016) characterized the human PIEZO2 deficiency syndrome with absent proprioception and touch[@chesler2016]
Ge et al. (2015) determined the cryo-EM structure of mouse PIEZO2, revealing its trimeric propeller architecture[@wang2019]

External Links

[NCBI Gene: PIEZO2](https://www.ncbi.nlm.nih.gov/gene/63895)
[UniProt: Q9H5I5](https://www.uniprot.org/uniprot/Q9H5I5)
[GeneCards: PIEZO2](https://www.genecards.org/cgi-bin/carddisp.pl?gene=PIEZO2)
[OMIM: 613629](https://omim.org/entry/613629)
[Nobel Prize 2021: Mechanosensation](https://www.nobelprize.org/prizes/medicine/2021/summary/)

Cross-Links

Diseases

[Alzheimer's Disease](/diseases/alzheimers-disease)
[Parkinson's Disease](/diseases/parkinsons-disease-disease)
[Amyotrophic Lateral Sclerosis](/diseases/amyotrophic-lateral-sclerosis)
[Glioblastoma](/diseases/glioblastoma-multiforme)

Mechanisms

[Blood-Brain Barrier](/mechanisms/blood-brain-barrier)
[Focused Ultrasound](/therapeutics/focused-ultrasound)
[Nanoparticle Delivery](/mechanisms/nanoparticle-delivery)
[Drug Delivery](/mechanisms/drug-delivery-across-bbb)
[Mechanotransduction](/mechanisms/mechanotransduction)

Proteins & Genes

[PIEZO2](/genes/piezo2)
[TRPV4](/genes/trpv4)
[Amyloid Beta](/proteins/amyloid-beta)
[Alpha-Synuclein](/proteins/alpha-synuclein)
[Tau Protein](/proteins/tau)

Cell Types

[Endothelial Cells](/cell-types/endothelial-cells)
[Neurons](/entities/neurons)
[Microglia](/cell-types/microglia)
[Astrocytes](/cell-types/astrocytes)

Treatments

[Focused Ultrasound Therapy](/therapeutics/focused-ultrasound-therapy)
[Nanoparticle Drug Delivery](/therapeutics/nanoparticle-drug-delivery)
[Immunotherapy](/therapeutics/immunotherapy)
[Blood-Brain Barrier Modulation](/therapeutics/blood-brain-barrier-modulation)

References

[Coste B et al, Piezo1 and Piezo2 are essential components of distinct mechanically activated cation channels (2010)](https://pubmed.ncbi.nlm.nih.gov/20813920/)

[Ranade SS et al, Piezo2 is the major transducer of mechanical forces for touch sensation in mice (2014)](https://pubmed.ncbi.nlm.nih.gov/25480887/)

[Wu J et al, Inactivation of mechanically activated Piezo1 ion channels is determined by the C-terminal extracellular domain and the inner pore helix (2017)](https://pubmed.ncbi.nlm.nih.gov/28119082/)

[Koser DE et al, Mechanosensing is critical for axon growth in the developing brain (2016)](https://pubmed.ncbi.nlm.nih.gov/27545714/)

[Coste B et al, Gain-of-function mutations in the mechanically activated ion channel PIEZO2 cause a subtype of distal arthrogryposis (2013)](https://pubmed.ncbi.nlm.nih.gov/23542699/)

[Chesler AT et al, The role of PIEZO2 in human mechanosensation (2016)](https://pubmed.ncbi.nlm.nih.gov/27383785/)

[Nonomura K et al, Piezo2 senses airway stretch and mediates lung inflation-induced apnoea (2017)](https://pubmed.ncbi.nlm.nih.gov/28002412/)

[Szczot M et al, PIEZO2 mediates injury-induced tactile pain (2018)](https://pubmed.ncbi.nlm.nih.gov/29370074/)

[Woo SH et al, Piezo2 is required for Merkel-cell mechanotransduction (2014)](https://pubmed.ncbi.nlm.nih.gov/25480889/)

[Wang L et al, Structure and mechanogating of the mammalian tactile channel PIEZO2 (2019)](https://pubmed.ncbi.nlm.nih.gov/31597131/)

Pathway Diagram

The following diagram shows the key molecular relationships involving PIEZO2 — Piezo Type Mechanosensitive Ion Channel Component 2 discovered through SciDEX knowledge graph analysis:

Mermaid diagram (expand to render)

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Related Entities

PIEZO2

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slug	genes-piezo2
kg_node_id	PIEZO2
entity_type	gene
origin_type	v1_polymorphic_backfill
source_table	wiki_pages
wiki_page_id	wp-de05c9868a5c
__merged_from	{'merged_at': '2026-05-13', 'unprefixed_id': 'genes-piezo2'}
_schema_version	1

📊 Evidence Profile Foundational

Evidence Balance

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Certainty

60%

Debates

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Incoming

12

Outgoing

26

0 supporting 0 contradicting 0 neutral

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PIEZO2 — Piezo Type Mechanosensitive Ion Channel Component 2

PIEZO2 — Piezo Type Mechanosensitive Ion Channel Component 2

Pathway Diagram

PIEZO2 — Piezo Type Mechanosensitive Ion Channel Component 2

Pathway Diagram

PIEZO2 — Piezo Type Mechanosensitive Ion Channel Component 2

Overview

Gene Structure and Expression

Function

Mechanotransduction

Channel Biophysics

Neurodevelopmental Functions

Disease Associations

Distal Arthrogryposis Type 5 (DA5)

Gordon Syndrome

PIEZO2 Deficiency Syndrome (Loss-of-Function)

Relevance to Neurodegeneration

Therapeutic Implications

Pharmacological Modulation

Gene Therapy

Rehabilitation Relevance

Key Research Findings

See Also

External Links

Cross-Links

Diseases

Mechanisms

Proteins & Genes

Cell Types

Treatments

References

Pathway Diagram

💬 Discussion