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• W2029043558 abstract "Abstract Background and aim “Gain-of-function” mutations in voltage-gated sodium channel Na V 1.7 have been linked to erythromelalgia (EM), characterized by painful hot and red hands and feet. We investigated the proportion of patients with EM that carry a mutation in Na V 1.7 or in other pain-related genes and studied possible clinical differences. Methods In this study, 48 patients with EM were screened for mutations in a total of 29 candidate genes, including all sodium channel subunits, transient receptor potential channels (TRPA1, TRPV1, TRPM8), neurotrophic factors (NGF, NGFR, BDNF, GDNF, NTRK1 and WNK1) and other known pain-related genes (CACNG2, KCNS1, COMT, P2RX3, TAC1, TACR1), using a combination of next generation sequencing and classical Sanger sequencing. Results In 7/48 patients protein-modifying mutations of Na V 1.7 (P187L, I228M, I848T ( n = 4) and N1245S) were identified. Patients with the I848T mutation could be identified clinically based on early onset and severity of the disease. In contrast, there were no clinical characteristics that differentiated the other patients with Na V 1.7 mutation from those patients without. We also found more than twenty rare protein-modifying genetic variants in the genes coding for sodium channels (Na V 1.8, Na V 1.9, Na V 1.6, Na V 1.5, Na V 2.1, SCN1B, SCN3B), transient receptor potential channel (TRPA1, TRPV1), and other pain-related targets (WNK1 and NGFR). Conclusion We conclude that functionally characterized mutations of Na V 1.7 (I848T) are present only in a minority of patient with EM. Albeit the majority of patients (27/48) carried rare protein-modifying mutations the vast majority of those will most probably not be causally linked to their disease. Implications The key question remaining to be solved is the possible role of rare variants of Na V 1.8, Na V 1.9, or beta-subunits in provoking chronic pain conditions or even EM." @default.
• W2029043558 created "2016-06-24" @default.
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• W2029043558 date "2014-10-01" @default.
• W2029043558 modified "2023-10-17" @default.
• W2029043558 title "Exonic mutations in SCN9A (Na_V1.7) are found in a minority of patients with erythromelalgia" @default.
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• W2029043558 doi "https://doi.org/10.1016/j.sjpain.2014.09.002" @default.
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