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Articles

The major delayed rectifier in both Drosophila neurons and muscle is encoded by Shab

S Tsunoda and L Salkoff
Journal of Neuroscience 1 July 1995, 15 (7) 5209-5221; DOI: https://doi.org/10.1523/JNEUROSCI.15-07-05209.1995
S Tsunoda
Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
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L Salkoff
Department of Anatomy and Neurobiology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
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Abstract

The delayed rectifier K+ current in Drosophila is similar to the classical delayed rectifier, originally described by Hodgkin and Huxley. Drosophila provides unique tools of mutant analysis to unambiguously determine the genetic identity of this native K+ current. We identified the Shab gene as the exclusive gene underlying delayed rectifier currents in both muscle and neurons. In muscles, a genetic mutation of Shab removes virtually all the whole cell delayed rectifier current (IK), while leaving unaltered the transient A-current encoded by the Shaker gene. In neurons, the Shab mutation also removes the bulk of IK, but leaves unaltered the transient A-current encoded by the Shal gene. Although most of the delayed rectifier current is the product of the Shab gene, the Shaw gene contributes a small “leak” current to most neurons and muscle cells. Thus, in contrast to the A-currents which are encoded by different genes in muscle and neuronal cell bodies (Shaker and Shal, respectively), the predominant IK in both muscle and neurons is encoded by the same gene (Shab). With the genetic identity of IK confirmed, all of the major K+ currents in embryonic Drosophila neurons and muscle are now known.

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The Journal of Neuroscience: 15 (7)
Journal of Neuroscience
Vol. 15, Issue 7
1 Jul 1995
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The major delayed rectifier in both Drosophila neurons and muscle is encoded by Shab
S Tsunoda, L Salkoff
Journal of Neuroscience 1 July 1995, 15 (7) 5209-5221; DOI: 10.1523/JNEUROSCI.15-07-05209.1995

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The major delayed rectifier in both Drosophila neurons and muscle is encoded by Shab
S Tsunoda, L Salkoff
Journal of Neuroscience 1 July 1995, 15 (7) 5209-5221; DOI: 10.1523/JNEUROSCI.15-07-05209.1995
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