Persistent tetrodotoxin-sensitive sodium current resulting from U-to-C RNA editing of an insect sodium channel.

Journal Article (Journal Article)

The persistent tetrodotoxin (TTX)-sensitive sodium current, detected in neurons of many regions of mammalian brains, is associated with many essential neuronal activities, including boosting of excitatory synaptic inputs, acceleration of firing rates, and promotion of oscillatory neuronal activities. However, the origin and molecular basis of the persistent current have remained controversial for decades. Here, we provide direct evidence that U-to-C RNA editing of an insect sodium channel transcript generates a sodium channel with a persistent current. We detected a persistent TTX-sensitive current in a splice variant of the cockroach sodium channel gene BgNa(v) (formerly para(CSMA)). Site-directed mutagenesis experiments revealed that an F-to-S change at the C-terminal domain of this variant was responsible for the persistent current. We demonstrated that this F-to-S change was the result of a U-to-C RNA editing event, which also occurred in the Drosophila para sodium channel transcript. Our work provides direct support for the hypothesis that posttranscriptional modification of a conventional transient sodium channel produces a persistent TTX-sensitive sodium channel.

Full Text

Duke Authors

Cited Authors

  • Liu, Z; Song, W; Dong, K

Published Date

  • August 2004

Published In

Volume / Issue

  • 101 / 32

Start / End Page

  • 11862 - 11867

PubMed ID

  • 15280550

Pubmed Central ID

  • PMC511065

Electronic International Standard Serial Number (EISSN)

  • 1091-6490

International Standard Serial Number (ISSN)

  • 0027-8424

Digital Object Identifier (DOI)

  • 10.1073/pnas.0307695101

Language

  • eng