Paroxysmal extreme pain disorder mutations within the D3/S4-S5 linker of Nav1.7 cause moderate destabilization of fast inactivation

Brian W. Jarecki, Patrick Sheets, James O. Jackson, Theodore Cummins

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Abstract

Single-point missense mutations in the peripheral neuronal voltage-gated sodium channel Nav1.7 are implicated in the painful inherited neuropathy paroxysmal extreme pain disorder (PEPD). The Nav1.7 PEPD mutations are located in regions of the channel suggested to play important roles in fast inactivation. PEPD mutations in the putative inactivation gate have been reported to significantly impair fast inactivation, resulting in pronounced persistent currents. However, PEPD mutations in the S4-S5 linker of domain 3 (D3/S4-S5) had not been characterized and the roles of specific residues in this linker in channel gating are unclear. We functionally characterized two of the D3/S4-S5 PEPD mutations (V1298F and V1299F) and compared their effects on gating to an adjacent non-PEPD mutation (V1300F) and the I1461T PEPD mutation, located in the putative inactivation gate. The primary effect of the V1298F and V1299F mutations is to shift the voltage dependence of fast inactivation by ∼20 mV in the depolarizing direction. We observed a similar effect with the PEPD mutation I1461T. Interestingly, while all three PEPD mutations increased persistent currents, the relative amplitudes (∼6% of peak) were much smaller than previously reported for the I1461T mutation. In contrast, the main effect of the V1300F mutation was a depolarizing shift in the voltage dependence of activation. These data demonstrate that (1) mutations within D3/S4-S5 affect inactivation of Nav1.7 in a residue-specific manner and (2) disruption of the fast-inactivated state by PEPD mutations can be more moderate than previously indicated, which has important implications for the pathophysiology of PEPD.

Original languageEnglish
Pages (from-to)4137-4153
Number of pages17
JournalJournal of Physiology
Volume586
Issue number17
DOIs
StatePublished - 2008

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Mutation
NAV1.7 Voltage-Gated Sodium Channel
Paroxysmal Extreme Pain Disorder
Somatoform Disorders
Missense Mutation
Point Mutation

ASJC Scopus subject areas

  • Physiology

Cite this

Paroxysmal extreme pain disorder mutations within the D3/S4-S5 linker of Nav1.7 cause moderate destabilization of fast inactivation. / Jarecki, Brian W.; Sheets, Patrick; Jackson, James O.; Cummins, Theodore.

In: Journal of Physiology, Vol. 586, No. 17, 2008, p. 4137-4153.

Research output: Contribution to journalArticle

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