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• W2100034739 abstract "Dominant gain-of-function mutations that hyperpolarize activation of the Nav1.7 sodium channel have been linked to inherited erythromelalgia (IEM), a disorder characterized by severe pain and redness in the feet and hands in response to mild warmth. Pharmacotherapy remains largely ineffective for IEM patients with cooling and avoidance of triggers being the most reliable methods to relieve pain. We now report a 5 year old patient with pain precipitated by warmth, together with redness in her hands and feet. Her pain episodes were first reported at 12 months, and by the age of 15–16 months were triggered by sitting as well as heat. Pain has been severe, inducing self-mutilation, with limited relief from drug treatment. Our analysis of the patient's genomic DNA identified a novel Nav1.7 mutation which replaces isoleucine 234 by threonine (I234T) within domain I/S4–S5 linker. Whole-cell voltage-clamp analysis shows a I234T-induced shift of −18 mV in the voltage-dependence of activation, accelerated time-to-peak, slowed deactivation and enhanced responses to slow ramp depolarizations, together with a −21 mV shift in the voltage-dependence of slow-inactivation. Our data show that I234T induces the largest activation shift for Nav1.7 mutations reported thus far. Although enhanced slow-inactivation may attenuate the gain-of-function of the I234T mutation, the shift in activation appears to be dominant, and is consistent with the severe pain symptoms reported in this patient." @default.
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• W2100034739 date "2010-10-01" @default.
• W2100034739 modified "2023-09-24" @default.
• W2100034739 title "A new Nav1.7 sodium channel mutation I234T in a child with severe pain" @default.
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• W2100034739 doi "https://doi.org/10.1016/j.ejpain.2010.03.007" @default.
• W2100034739 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20385509" @default.
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