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Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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Alternative RNA Splicing02:18

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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
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Tension Response at Adherens Junctions01:26

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The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
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What is Gene Expression?01:36

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A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised  of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then...
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Transducer Mechanism: G Protein–Coupled Receptors01:30

Transducer Mechanism: G Protein–Coupled Receptors

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G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
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Video Experimental Relacionado

Updated: Feb 28, 2026

Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects
07:32

Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects

Published on: September 1, 2016

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Sensibilidad a la tensión de Piezo2 y su modulación por empalme alternativo

Michael Sindoni, William Sharp, Jörg Grandl

    bioRxiv : the preprint server for biology
    |February 27, 2026
    PubMed
    Resumen

    Las variantes de Piezo2 exhiben sensibilidades distintas a la fuerza mecánica debido al empalme alternativo. El exón 35 confiere alta sensibilidad, explicando cómo Piezo2 cumple diversas funciones fisiológicas en la sensación táctil e interna.

    Palabras clave:
    Piezo2mecanotransducciónsensibilidad a la tensiónempalme alternativoexón 35tactointerocepciónneurocienciabiofísica

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    Last Updated: Feb 28, 2026

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    Área de la Ciencia:

    • Biofísica
    • Biología Molecular
    • Neurociencia

    Sus antecedentes:

    • Piezo2 es un canal iónico mecanosensible crucial para la detección del tacto, la propiocepción y la función de los órganos internos.
    • El Piezo2 humano presenta un extenso empalme alternativo, produciendo al menos 22 variantes con diferencias funcionales desconocidas en la sensibilidad mecánica.

    Objetivo del estudio:

    • Investigar las propiedades biofísicas de Piezo2, específicamente su respuesta a la tensión de la membrana.
    • Determinar cómo el empalme alternativo afecta la sensibilidad mecánica y el rango funcional de Piezo2.

    Principales métodos:

    • Electrofisiología de pinzamiento de presión unido a células combinada con microscopía de contraste de interferencia diferencial.
    • Cuantificación de la respuesta de Piezo2 a la tensión controlada de la membrana y la indentación celular.

    Principales resultados:

    • Se identificó el exón 35 de empalme alternativo como un dominio clave suficiente para la alta sensibilidad de Piezo2 a la tensión de la membrana.
    • Se demostró que las diferentes variantes de Piezo2 poseen sensibilidades y rangos dinámicos distintos para la detección de fuerzas mecánicas.
    • Se estableció un vínculo entre la estructura de Piezo2, el empalme alternativo y las propiedades de compuerta mecánica.

    Conclusiones:

    • El empalme alternativo de Piezo2 modula significativamente su mecanosensibilidad, permitiendo roles fisiológicos especializados.
    • Las variantes de Piezo2 están finamente ajustadas para cumplir requisitos distintos en la somatosensación y la interocepción.
    • Los hallazgos proporcionan una base mecanicista para las diversas funciones sensoriales de Piezo2.