PIEZO1 (Piezo-Type Mechanosensitive Ion Channel Component 1)
PIEZO1 (piezo type mechanosensitive ion channel component 1 (Er blood group); HGNC:28993, NCBI Gene ID 9780) is a human locus mapped to chromosome band 16q24.3 that encodes Piezo1 homotrimeric mechanosensitive cation channel (2,521 aa per monomer). PIEZO1 acts in vascular shear-stress sensing, erythrocyte volume homeostasis & osteogenesis, together with PIEZO2 Mechanosensitive Channel Gene, Mechanosensitive Ion Channels, and NOS3 (Endothelial Nitric Oxide Synthase). Encodes the non-neuronal mechanosensitive cation channel governing erythrocyte volume and vascular shear stress.
Approved Symbol
PIEZO1
Chromosomal Locus
16q24.3
Encoded Product
Piezo1 homotrimeric mechanosensitive cation channel (2,521 aa per monomer)
Genomic Organization & Cytogenetic Locus: 51-exon gene at 16q24.3 encoding a 2,521-residue subunit with 38 transmembrane passes that forms a curved, dome-like trimeric propeller complex capable of locally bending the plasma membrane and gating in response to bilayer tension.
Biochemical & Physiological Mechanism: Senses fluid shear stress in blood and lymphatic vessels to trigger Ca2+ influx, endothelial nitric oxide synthase (NOS3) phosphorylation, and vascular remodeling, while in erythrocytes mechanical deformation during capillary transit opens Piezo1 to activate the Gardos Ca2+-activated K+ channel (KCNN4) and regulate cell volume.
Clinical & Therapeutic Significance
Human Genetic Variants & Disease Phenotypes: Dominant gain-of-function variants slow inactivation and cause dehydrated hereditary stomatocytosis (xerocytosis), with the common African allele p.Glu756del conferring protection against severe Plasmodium falciparum malaria, whereas biallelic loss-of-function variants cause congenital generalized lymphatic dysplasia of Fotiou.
Therapeutic & Clinical Pharmacology: Investigated with small-molecule agonists (such as Yoda1 and Jedi2) and mechanical loading protocols to counteract disuse osteoporosis, lymphatic insufficiency, and endothelial dysfunction.