article · Science
Touch perception relies on specialised ion channels that open in response to mechanical force, triggering signals in sensory nerves beneath the skin. ELKIN1 is an ion channel required for normal touch sensitivity in mice. When the gene encoding ELKIN1 is missing, mice become insensitive to touch because mechanically activated electrical currents are lost in roughly half of the sensory neurons responsible for detecting light touch. Restoring the gene to these deficient neurons successfully recovers their electrical response to mechanical force. Furthermore, reducing ELKIN1 levels in laboratory-grown human sensory neurons significantly decreases touch-induced currents. These findings demonstrate that ELKIN1 acts as a fundamental component of the physical touch perception machinery in mice, whilst pointing to an equivalent role in human sensory biology.
Understanding how the nervous system converts physical touch into electrical impulses is essential for sensory biology. Identifying ELKIN1 as a key channel for light touch explains how sensory neurons detect physical forces. This foundational insight clarifies the basic molecular mechanisms governing tactile sensation in mammals and broadens the understanding of how mechanical inputs are processed.
This work represents early-stage discovery research identifying a molecular mechanism involved in touch sensation. The abstract does not indicate a commercialisation pathway, product, or specific industrial application. Any future translation, such as targeting the channel for sensory or neurological therapies, would be at a very early biological exploration stage and remains distant from practical use.
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Touch perception is enabled by mechanically activated ion channels, the opening of which excites cutaneous sensory endings to initiate sensation. In this study, we identify ELKIN1 as an ion channel likely gated by mechanical force, necessary for normal touch sensitivity in mice. Touch insensitivity in <i>Elkin1<sup>-/-</sup></i> mice was caused by a loss of mechanically activated currents (MA currents) in around half of all sensory neurons activated by light touch (low-threshold mechanoreceptors). Reintroduction of <i>Elkin1</i> into sensory neurons from <i>Elkin1<sup>-/-</sup></i> mice restored MA currents. Additionally, small interfering RNA-mediated knockdown of <i>ELKIN1</i> from induced human sensory neurons substantially reduced indentation-induced MA currents, supporting a conserved role for ELKIN1 in human touch. Our data identify ELKIN1 as a core component of touch transduction in mice and potentially in humans.
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DOI: 10.1126/science.adl0495
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